Relevant bibliographies by topics / Pegmatites

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Pegmatites'

Author: Grafiati
Published: 4 June 2021
Last updated: 30 July 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Pegmatites.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Pegmatites"

1

Kontak, Daniel J., Kevin Ansdell, Jaroslav Dostal, Werner Halter, Robert Martin, and Anthony E. Williams-Jones. "The nature and origin of pegmatites in a fluorine-rich leucogranite, East Kemptville Tin Deposit, Nova Scotia, Canada." Transactions of the Royal Society of Edinburgh: Earth Sciences 92, no. 2 (June 2001): 173–200. http://dx.doi.org/10.1017/s0263593300000122.

Full text
Abstract:
ABSTRACTPegmatites at the East Kemptville Sn-Zn-Cu-Ag deposit occur within a F- and P-rich, 370 Ma topaz-muscovite leucogranite, the most evolved phase of the chemically zoned Davis Lake Pluton. Structural observations and geochronology indicate that the leucogranite intruded into an active shear/fault zone environment. Pegmatites are preferentially located near the roof zone of the intrusion and include: (1) quartz-feldspar pods (≤ 1–2 m) aligned parallel to a foliation in the leucogranite. Such pegmatites have marginal aplites or may be cored by aplites; (2) aplite-pegmatite zones with well-developed crenulate and unidirectional solidification textures; and (3) muscovite-bordered miarolitic cavities lined with quartz-feldspar ± cassiterite. Associated with areas of pegmatites are irregular- to cuspate-shaped zones enriched in muscovite. Mineralogically the pegmatites are simple, consisting of clear to black quartz, albite, microcline perthite and muscovite; topaz may be enriched in aplites coring pegmatites and coarse euhedral cassiterite is rare.Chemically the leucogranites marginal to pegmatites are similar to the host leucogranite, but some aphanitic felsic dykes indicate extreme differentiation, as reflected by REE depletion and P-enrichment. Enrichment of pegmatitic feldspar in P2O5 (to 1 wt. %) indicates that melts contained 2–3 wt. % P2O5, whereas muscovite chemistry (to 5 wt. % F) reflects the F-rich nature of the melt. Trace and REE contents of pegmatitic feldspars are consistent with local segregation of volatile-rich melts to form pegmatites rather than extreme crystal-chemical fractionation.Fluid inclusion studies of pegmatitic quartz and cassiterite indicate the presence of a highly saline brine (40 wt. % eq. NaCl; Na > K > Fe > Mn > Ca > Sr) of magmatic origin. Isochores modelled for a 40 wt. % eq. NaCl fluid constrain pegmatite formation at 550–600°C, thus the depressed solidus is consistent with the volatile-rich (F, P, H2O) nature of the melt. Stable isotopes demonstrate that a magmatic fluid (δ18OH2O = +5·5 to +10‰, δDH2O = −33 to −41‰ for 450–500°C) equilibrated with the pegmatites and the system cooled abruptly at c. 425°C.The low volume of pegmatite at East Kemptville suggests that the melt was not near volatile saturation, instead pegmatite generation is interpreted to have resulted from rapid decompression related to the active shear zone setting of the granite. Although feldspar chemistry reflects a local segregation model, the chemistry of aphanitic dyke rocks indicates that the leucogranite did evolve into a more fractionated melt. The local presence of cassiterite in pegmatites and miarolitic cavities indicates that locally, saturation of Sn occurred, but not throughout the EKL where elevated Sn contents are attributed to infiltration of mineralising fluids (i.e. deuteric alteration).
APA, Harvard, Vancouver, ISO, and other styles
2

Garate-Olave, Idoia, Encarnación Roda-Robles, Pedro Pablo Gil-Crespo, and Alfonso Pesquera. "Phosphate mineral associations from the Tres Arroyos aplite-pegmatites (Badajoz, Spain): Petrography, mineral chemistry, and petrogenetic implications." Canadian Mineralogist 58, no. 6 (November 1, 2020): 747–65. http://dx.doi.org/10.3749/canmin.1900102.

Full text
Abstract:
ABSTRACTIn the Tres Arroyos granite-pegmatite system (Badajoz, Spain) a zoned aplite-pegmatite field occurs, with poorly evolved, intermediate, and Li-rich dikes intruded into metasediments, close to the contact with the Nisa-Alburquerque granitic batholith. A large variety of Fe-Mn phosphate minerals occur in the poorly evolved aplite-pegmatites; Al-phosphates occur mainly in the intermediate and Li-rich dikes. The Fe/(Fe + Mn) ratio of the Fe-Mn phosphates is the highest reported for aplite-pegmatite fields in the Central Iberian Zone, suggesting a low degree of fractionation for the poorly evolved aplite-pegmatites that host these minerals. In contrast, the high F contents observed in crystals of the amblygonite–montebrasite series from the intermediate and Li-rich aplite-pegmatites indicates a higher fractionation degree for these dikes. The relatively common occurrence of phosphate minerals in the three types of aplite-pegmatites from Tres Arroyos attests to a significant availability of P in the pegmatitic melt. In this granite pegmatite system, P first started behaving as a compatible element, thus favoring the crystallization of discrete phosphates, during the crystallization of the poorly evolved aplite-pegmatites. In more fractionated melts, where Fe-Mn-(Mg) contents were extremely depleted, P was still available, allowing the crystallization of the Al-phosphates, mainly of the amblygonite–montebrasite series, in the more evolved intermediate and Li-rich aplite-pegmatites. Subsolidus replacement of the early phosphate phases, such as those of the amblygonite–montebrasite series, by lacroixite, together with the presence of late Ca- and Sr-bearing phosphates such as jahnsite-(CaMnFe), whiteite-(CaFeMg), mitridatite, and goyazite, attest to a high activity of metasomatic fluids in the Tres Arroyos granite-pegmatite system. Consequently, variations in the phosphate mineral associations and in their chemical compositions reflect well the fractional crystallization processes suffered by the pegmatitic melts from the poorly evolved up to the Li-rich dikes, as well as the subsolidus history of the Tres Arroyos system.
APA, Harvard, Vancouver, ISO, and other styles
3

Pereira, Ronaldo Mello, Diana Rodrigues, Ciro Alexandre Ávila, and Reiner Neumann. "Stockscheider Quartzo-Moscovíticos e Pegmatíticos na Zona de Cúpula do Granitóide Ritápolis, Região de São João del Rei, Minas Gerais." Anuário do Instituto de Geociências 34, no. 2 (January 1, 2011): 59–69. http://dx.doi.org/10.11137/2011_2_59-69.

Full text
Abstract:
Clusters of essentially quartz-muscovitic rocks were found in four areas of the São João del Rei Pegmatite Province in close association with pegmatites positioned parallel to the contact between the Ritápolis granitoid and the metavolcanic - metasedimentary rocks of the Rio das Mortes greenstone belt. The suite of accessory minerals associated to the quartz-muscovite and pegmatite stockscheider (columbite-tantalite, cassiterite, gahnite, zircon, xenotime and monazite) are similar to those determined for the pegmatites of the province. The mineralogy of inclusions (Pb-tantalite, microlite, Pb-microlite, U-microlite, Ba-microlite, Hf-rich zircon) in the Fe-columbite associated to the stockscheider is similar to those determined for the Fe-columbite of the more evolved pegmatites found in the province. The quartz-muscovite and pegmatite stockscheider are related to Ritápolis granitoid with is related to the other pegmatites of São João del Rei Pegmatite Province. The proposed mechanism for the formation of clusters of muscovite-quartz and pegmatitic stockscheider is the crystallization of pockets of tardi-magmatic and pos-magmatic hydrothermal - metasomatic fluids segregated from the parental granitic magma and injected into fractures parallel to the roof contact of the granitoid dome.
APA, Harvard, Vancouver, ISO, and other styles
4

Adingra, Martial Pohn Koffi, Zié Ouattara, Tokpa Kakeu Lionel Dimitri Boya, Augustin Junior Yapo, Koffi Joseph Brou, and Brice Roland Kouassi. "Petrography and Geochemical Signatures of Pegmatites from the Southeastern Part Comoé Basin (South-East Côte d'Ivoire, North Alépé)." Journal of Geography, Environment and Earth Science International 27, no. 4 (May 17, 2023): 51–68. http://dx.doi.org/10.9734/jgeesi/2023/v27i4680.

Full text
Abstract:
The pegmatitic rocks located in the south-east of Côte d'Ivoire between the Comoé basin and the Sefwi belt are the subject of this study. The geology of this region consists of gneisses, granites, microgranites, amphibolites, mylonites and metasediments. All these rocks are generally crosscut by quartz and pegmatite lodes. The petrographic studies allow us to discriminate four groups of pegmatites on the basis of mineralogy: (i) beryl-muscovite bearing pegmatite (Aboisso-Comoé), (ii) albite-tourmaline bearing pegmatite (Aboisso-Comoé), (iii) micas-tourmaline bearing pegmatite (Alosso) and (iv) muscovite-garnet bearing pegmatite (Songan forest). XRD analyzes on 4 samples revealed the presence of lepidolite (lithium ore) in the muscovite-garnet bearing pegmatite (Songan forest) and phengite in beryl-muscovite bearing pegmatite (Aboisso-Comoé). The pegmatite diffractograms of Aboisso-Comoé (beryl-muscovite bearing pegmatite) and Songan forest (muscovite-garnet bearing pegmatite) show almost same signatures and would suggest that those pegmatites come from the same source. Geochemical analyzes by portable XRF carried out on muscovite and feldspar minerals indicate that the samples from Aboisso-Comoé and Songan forest have the characteristics of Lithium-Cesium-Tantale type (LCT) pegmatites. The geochemical diagrams indicated the probable presence of beryl and spodumene type mineralization in the muscovite-garnet bearing pegmatite.
APA, Harvard, Vancouver, ISO, and other styles
5

Hernández-Filiberto, Lorena, Encarnación Roda-Robles, William B. Simmons, and Karen L. Webber. "Garnet as Indicator of Pegmatite Evolution: The Case Study of Pegmatites from the Oxford Pegmatite Field (Maine, USA)." Minerals 11, no. 8 (July 23, 2021): 802. http://dx.doi.org/10.3390/min11080802.

Full text
Abstract:
Almandine-spessartine garnets, from the Oxford County pegmatites and the Palermo No. 1 pegmatite, record significant compositional variations according to the degree of evolution of their hosting rock. Garnets from the most fractionated pegmatites (Mt. Mica, Berry-Havey, and Emmons) show the highest Mn, Nb, Ta, Zr, and Hf values, followed by those from the intermediate grade pegmatites (Palermo No. 1) and, finally, garnets from the barren pegmatites show the lowest values (Perham and Stop-35). Iron, Ca, and Mg contents follow an inverse order, with the highest contents in the latter pegmatites. Major element zoning shows increasing Mn values from core to rim in most garnet samples, while trace element zoning is not systematic except for some crystals which show a core to rim depletion for most of these elements. Chondrite normalized HREE (Heavy Rare Earth Elements) spectra show positive slopes for garnets from barren pegmatites, both positive and negative slopes for those associated with the intermediate pegmatite, and negative or flat slopes in garnets from the highly fractionated pegmatites. Ion exchange mechanisms, including Fe2+−1Mn2+1, (Fe2+, Mn2+)−1Si−1Li1P1; and, (Y, Ho3+)2(vac)1(Fe2+, Mn2+)−3, could explain most of the compositional variations observed in these garnets. These compositional variations are the reflection of the composition of the pegmatitic magma (barren pegmatites originate from a more ferromagnesian magma than fractionated pegmatites); and of the coexisting mineral phases competing with garnets to host certain chemical elements, such as biotite, schorl, plagioclase, apatite, Fe-Mn phosphates, Nb-Ta oxides, zircon, xenotime, and monazite.
APA, Harvard, Vancouver, ISO, and other styles
6

Roda-Robles, E., A. Pesquera, P. P. Gil-Crespo, R. Vieira, A. Lima, I. Garate-Olave, T. Martins, and J. Torres-Ruiz. "Geology and mineralogy of Li mineralization in the Central Iberian Zone (Spain and Portugal)." Mineralogical Magazine 80, no. 1 (February 2016): 103–26. http://dx.doi.org/10.1180/minmag.2016.080.049.

Full text
Abstract:
AbstractLithium mineralization is common in the Central Iberian Zone and, to a lesser extent, in the Galizia-Trás-OsMontes Zone of Spain and Portugal, occurring along a ∼500 km-long NNW-SSE striking belt. There are different styles of Li mineralization along this belt; they are mainly associated with aplite-pegmatite bodies and, to a much lesser extent, with veins of quartz and phosphate. Lithium mineralization in the Central Iberian Zone may be classified into four types: aplite-pegmatite dykes occurring in pegmatitic fields, Li mineralization associated with leucogranitic cupolas, beryl-phosphate pegmatites and quartz-montebrasite veins. The main Li minerals of these bodies include Li-mica, spodumene and/or petalite in the pegmatitic fields and leucogranitic cupolas; triphylite–lithiophilite in the beryl-phosphate pegmatites, and amblygonite–montebrasite in the quartz-montebrasite veins. The origin of these different styles of mineralization is considered to be related to differentiation of peraluminous melts, which were generated by partial melting of metasedimentary rocks during the Variscan orogeny. On the basis of paragenesis and chemical composition, the pegmatitic fields and Li mineralization associated with granitic cupolas record the highest fractionation levels, whereas the beryl-phosphate pegmatites and quartz-montebrasite veins show lower degrees of fractionation. There are a number of textural and mineralogical indicators for Li exploration in the Central Iberian Zone and in the Galizia-Trás-Os-Montes Zone, with the highest economic potential for Li being in the pegmatite fields.
APA, Harvard, Vancouver, ISO, and other styles
7

Breiter, K., L. Ackerman, J. Ďurišova, M. Svojtka, and M. Novák. "Trace element composition of quartz from different types of pegmatites: A case study from the Moldanubian Zone of the Bohemian Massif (Czech Republic)." Mineralogical Magazine 78, no. 3 (June 2014): 703–22. http://dx.doi.org/10.1180/minmag.2014.078.3.17.

Full text
Abstract:
AbstractThe evolution of the trace-element patterns of quartz during crystallization of pegmatite melt was investigated using laser ablation inductively coupled plasma mass spectrometry. The contents of Al, B, Ba, Be, Cr, Fe, Ge, Li, Mn, P, Rb, Sn, Sr and Ti were analysed in quartz from the border, intermediate and core zones of four granitic pegmatites differing in degree of fractionation and origin. The material investigated originates from the pegmatite district of the Strážek Unit, Moldanubian Zone, Bohemian Massif, Czech Republic and includes: lepidolite LCT (Li-Cs-Ta) pegmatite from Rožná; berylcolumbite LCT pegmatite from Věžná; anatectic pegmatite from Znětínek; and intragranitic NYF (Nb-Y-F) pegmatite Vladislav from the Třebíč Pluton. The abundances of the elements analysed varied over wide intervals: <1 to 32 ppm Li, 0.5 to 6 ppm B, <1 to 10 ppm Ge, 1 to 10 ppm P, 10 to 450 ppm Al, 1 to 45 ppm Ti and <1 to 40 ppm Fe (average sample contents). Concentrations of Be, Rb, Sr, Sn, Ba, Cr and Mn are usually <1 ppm. Quartz from LCT pegmatites exhibits a distinct evolutionary trend with a decrease in Ti and an increase in Al, Li and Ge from the pegmatite border to the core. In comparison with the most fractionated rare-metal granites, pegmatitic quartz is relatively depleted in Al and Li, but strongly enriched in Ge. Quartz from simple anatectic and NYF pegmatites is poor in all trace elements with their evolution marked by a decrease in Ti and a small increase in Ge. There is little Al or Li and neither shows any systematic change with pegmatite evolution. Using the Ti-in-quartz thermobarometer, the outer zones of the Znětínek and Vladislav pegmatites crystallized at ∼670°C, whereas the border zone in the Rožná pegmatite yields a temperature near 610°C.
APA, Harvard, Vancouver, ISO, and other styles
8

Beurlen, Hartmut, Dwight R. Soares, Rainer Thomas, Lucila E. Prado-Borges, and Cláudio de Castro. "Mineral chemistry of tantalate species new in the Borborema Pegmatitic Province, Northeast Brazil." Anais da Academia Brasileira de Ciências 77, no. 1 (March 2005): 169–82. http://dx.doi.org/10.1590/s0001-37652005000100013.

Full text
Abstract:
Tantalate samples, supposedly of the columbite group, were collected in the Borborema Pegmatitic Province, aiming to test the Mn/(Mn+Fe) and Ta/(Ta+Nb) ratios as geochemical indicators of pegmatite fractionation. Surprisingly, preliminary microprobe data allowed recognizing some species, so far unknown in the Province, namely titanian ixiolite, fersmite, brannerite, strüverite, natrobistantite, plumbo- and stibiomicrolite, plumboand uranpyrochlore. The identification of these exotic tantalates with unusual composition, in addition to its distribution in several pegmatites, far from the classical Alto do Giz and Seridozinho pegmatites, indicate that the elevated degree of fractionation is not restricted to these two occurrences but may be reached in other pegmatite areas of the Province. It indicates also that this degree of fractionation may be very variable between pegmatites in small areas. The zoning patterns observed in the titanian ixiolite, with Ti and Nb enrichment at the borders at expense of Ta enriched in the core, are also quite unusual and reverse in comparison with the normal trend of progressive Ta and Mn enrichment in tantalates with the degree of fractionation. A similar "reverse" trend was observed in titanian wodginite of petalite/pollucite bearing pegmatites of the Separation Rapids Province in Ontario, Canada.
APA, Harvard, Vancouver, ISO, and other styles
9

Tanko, I. Y., and K. Dzigbodi-Adjimah. "Geochemistry and Petrogenetic Relationships Between Pegmatites and Host Rocks in the Keffi Area, North Central, Nigeria." European Journal of Engineering and Technology Research 6, no. 2 (February 8, 2021): 42–49. http://dx.doi.org/10.24018/ejers.2021.6.2.774.

Full text
Abstract:
Keffi pegmatites area which contains numerous mineralised and non-mineralised pegmatites lie between the Wamba pegmatite field to the NE and Nasarawa pegmatite field to the SW on the North Central Pegmatite belt of Nigeria. In Keffi area exploitation of deposits is currently being done by small scale miners, whose activities are haphazard and uncoordinated, because of that information on the geology and petrology that will enable a systematic study of the pegmatites in the area is scanty. Systematic geochemical investigations of the pegmatites and surrounding host rocks aimed at establishing petrogenetic relationships amongst the various rock types in the area were conducted. Major, trace and REE investigations of the pegmatites and associated granitoids have indicated petrogenetic relationships amongst the pegmatites and between the pegmatites and surrounding granitoids of Keffi area. Also, the variation diagram of major, trace and REE in whole rocks and K-feldspar samples show patterns which categorised the pegmatites of Keffi area into; (1) Non-mineralised, (2) intermediate and (3) mineralised pegmatites. It was also deduced from the geochemical characteristics (variation diagrams in major and trace element, REE geochemistry and tectonic environment classification) that a genetic model based on the evolution of melt by partial melting of metasedimentary protolith during ultrametamorphic and deformational activities (anatexis) is proposed for the granite-pegmatite system of Keffi area. This information will be useful as guide for fruitful exploration of the pegmatites and serves as model for the exploitation of pegmatite veins in similar geologic settings.
APA, Harvard, Vancouver, ISO, and other styles
10

Tanko, I. Y., and K. Dzigbodi-Adjimah. "Geochemistry and Petrogenetic Relationships Between Pegmatites and Host Rocks in the Keffi Area, North Central, Nigeria." European Journal of Engineering and Technology Research 6, no. 2 (February 8, 2021): 42–49. http://dx.doi.org/10.24018/ejeng.2021.6.2.774.

Full text
Abstract:
Keffi pegmatites area which contains numerous mineralised and non-mineralised pegmatites lie between the Wamba pegmatite field to the NE and Nasarawa pegmatite field to the SW on the North Central Pegmatite belt of Nigeria. In Keffi area exploitation of deposits is currently being done by small scale miners, whose activities are haphazard and uncoordinated, because of that information on the geology and petrology that will enable a systematic study of the pegmatites in the area is scanty. Systematic geochemical investigations of the pegmatites and surrounding host rocks aimed at establishing petrogenetic relationships amongst the various rock types in the area were conducted. Major, trace and REE investigations of the pegmatites and associated granitoids have indicated petrogenetic relationships amongst the pegmatites and between the pegmatites and surrounding granitoids of Keffi area. Also, the variation diagram of major, trace and REE in whole rocks and K-feldspar samples show patterns which categorised the pegmatites of Keffi area into; (1) Non-mineralised, (2) intermediate and (3) mineralised pegmatites. It was also deduced from the geochemical characteristics (variation diagrams in major and trace element, REE geochemistry and tectonic environment classification) that a genetic model based on the evolution of melt by partial melting of metasedimentary protolith during ultrametamorphic and deformational activities (anatexis) is proposed for the granite-pegmatite system of Keffi area. This information will be useful as guide for fruitful exploration of the pegmatites and serves as model for the exploitation of pegmatite veins in similar geologic settings.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Pegmatites"

1

Wood, Keith Yates. "Petrogenesis and geochemistry of kyanite-bearing pegmatites in the Buncombe Pegmatite District, North Carolina." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-08222008-063115/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Minnaar, Hendrik. "The exploitability of pegmatite deposits in the lower Orange River area (Vioolsdrif - Henkries - Steinkopf)." Pretoria ; [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-02212007-143602.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Wood, Patricia Ann. "Petrogenesis of the Spruce Pine pegmatites, North Carolina." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-08222008-063320/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Selway, Julie Beryl. "Compositional evolution of tourmaline in granitic pegmatites." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0021/NQ45138.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

SANTANA, Vítor Leão. "Beneficiamento de caulim na Região do Junco do Seridó/PB e Equador/RN e classificação de partículas em Hidrociclone." Universidade Federal de Campina Grande, 2017. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1321.

Full text
Abstract:
Submitted by Marcos Wanderley (marcos.wanderley@ufcg.edu.br) on 2018-08-01T23:20:41Z No. of bitstreams: 1 VITOR LEÃO SANTANA - DISSERTAÇÃO(PPGEPM) 2017.pdf: 6018243 bytes, checksum: d94d5006180bb3355610a18fa1063c66 (MD5)
Made available in DSpace on 2018-08-01T23:20:41Z (GMT). No. of bitstreams: 1 VITOR LEÃO SANTANA - DISSERTAÇÃO(PPGEPM) 2017.pdf: 6018243 bytes, checksum: d94d5006180bb3355610a18fa1063c66 (MD5) Previous issue date: 2017-04-04
Capes
Na região compreendida entre as cidades do Junco do Seridó/PB e Equador/RN ocorrem diversos depósitos de caulins associados à alteração dos feldspatos nos pegmatitos. A classificação desse minério mostra-se como uma tendência para melhoria do beneficiamento nas unidades da região. Em função das diversas vantagens da utilização de hidrociclones para esta etapa do processo, a inserção deste procedimento tem se mostrado bastante comum e inovadora na região. Assim, a partir de análises granulométricas, mineralógicas, imagens de microscópio eletrônico de varredura, análises químicas e ensaios de classificação no ciclone foram determinados os melhores parâmetros para classificação e beneficiamento do Caulim da região. Os ensaios realizados em hidrociclone em escala de bancada mostraram a possibilidade de obtenção de concentrados com teores de 92,92 % de caulinita, ajustando a pressão de alimentação da polpa em 2,0 kg.cm-2; abertura do apex em 10 mm, alimentação da polpa com válvula aberta. Outros parâmetros foram mantidos constantes como granulometria de alimentação: < 60 malhas Mesh (0,250 mm) e 22,0 % de porcentagem de sólidos.
In the region between the cities of Junco do Seridó / PB and Ecuador / RN there are several kaolin deposits associated with the change of feldspars in pegmatites. The classification of this ore appears to be a trend towards improved processing in the units of the region. Given the various advantages of using hydrocyclones for this stage of the process, the insertion of this procedure has proved to be quite common and innovative in the region. Thus, from granulometric, mineralogical analyzes, scanning electron microscope images, chemical analyzes and cyclone classification tests, it was determined the best parameters for classification and processing of kaolin in the region. The tests carried out on hydrocyclone on a bench scale showed the possibility of obtaining concentrates with contents of 92.92% of kaolinite, adjusting the feed pressure of the pulp to 2.0 kg.cm-2; Opening of the apex in 10 mm, feeding of the pulp with valve open. Other parameters were maintained constant as feed particle size: <60 mesh (0.250 mm) and 22.0% solids percentage.
APA, Harvard, Vancouver, ISO, and other styles
6

Felch, Myles Mathew, and Myles M. Felch. "The Garnet Line in Oxford County, Maine Pegmatites." ScholarWorks@UNO, 2014. http://scholarworks.uno.edu/td/1915.

Full text
Abstract:
The garnet line is a planar fabric occuring within the intermediate and core zone in many of the Oxford County, Maine pegmatites. This study focuses primarily on the textural and chemical characteristics of the garnet line within the Mt. Mica and western Mt. Apatite quarries. Smaller, but similarly textured garnet line analogs from the Bennett, Emmons, Havey and Tamminen quarries are also investigated. All of these textures represent specific fractionation events within their respective dikes. In some of these locations, multiple stages of crystallization occur and appear to be post-magmatic, related to late stage metasomatism. These late stage fluids are believed to have migrated from localized and highly evolved regions within these pegmatites. The garnet line at Mt. Mica has the greatest diversity of secondary mineral assemblages, e.g. tourmaline and/or muscovite rims around garnets and ferric pollucite. None of these late stage textures have ever been described before.
APA, Harvard, Vancouver, ISO, and other styles
7

Manier, Glavinaz Valérie. "Partage des éléments alcalins Li, Na et Cs entre béryls et solutions hydrothermales : approche expérimentale, conséquences géochimiques et cristallochimiques." Paris 6, 1989. http://www.theses.fr/1989PA066331.

Full text
Abstract:
Le reequilibrage, a 600#oc-1,5 kbar, d'un beryl naturel riche en alcalins rares (li, cs), avec des solutions de chlorures d'alcalins, montre que li, na et cs sont interchangeables. Le beryllium ne participe pas a la reaction. L'echange est independant de la chlorinite. Le calcul des coefficients de partage montre qu'il n'y a pas de fractionnement du lithium entre beryl et solution. En revanche, le partage de na est en faveur de la solution et celui de cs, en faveur du beryl. Le lessivage du beryl par des solutions d'acide se fait par echange cationique: h(li, na, cs). Le partage des protons est extremement favorable au beryl. L'examen par spectroscopies infra-rouge et de rayons x montre une meme influence des trois elements alcalins sur la structure. Leur presence induit un allongement des laisons si-o impliquees dans si-o-be et si-o-al. Les liaisons be-o ne sont pas affectees. Dans les beryls lessives, on note une augmentation de la periodicite dans la structure. En conclusion, ce travail experimental montre d'une part que contrairement a l'hypothese admise, les trois alcalins li, na et cs occupent des positions structuralement semblables et sont situes dans les canaux, et d'autre part que le beryl est un traceur de la composition du dernier fluide alcalin en equilibre. Celui-ci etait proportionnellement plus riche en na et plus pauvre en cs que le beryl. La circulation de fluides acides conduit a un lessivage des alcalins et s'accompagne d'une reorganisation de la structure
APA, Harvard, Vancouver, ISO, and other styles
8

Sebastian, Ansom. "Contribution à l'étude des pegmatites granitiques à éléments alcalins : équilibres entre silicates de Li, Na et Cs et fluides hydrothermaux de 300°C à 750°C." Paris 11, 1990. http://www.theses.fr/1990PA112109.

Full text
Abstract:
Lors de la cristallisation des mineraux des pegmatites granitiques a elements rares, les fluides hydrothermaux jouent un role important. L'objectif de ce travail est de definir par l'experimentation la composition en alcalins de ces fluides qui sont tamponnes par la presence d'un couple de mineraux tel que albite-pollucite, albite-petalite, albite-spodumene et pollucite-petalite qui ont ete etudies ici. La composition d'un fluide en li, na et cs peut alors etre calculee dans les conditions experimentales choisies. On obtient a 450#oc li/r=0,455 na/r=0,495 et cs/r=0,050 (r=li+na+cs) et a 600#oc li/r=0,404 na/r=0,487 et cs/r=0,109 pour le systeme petalite-albite-pollucite. Pour le systeme spodumene-albite-pollucite les chiffres sont assez voisins demontrant ainsi que le rapport na/li est toujours voisin de 1 et peu dependant de la temperature. A plus basse temperature (300#oc) on observe des variations plus importantes qui conduisent a des modifications du systeme lors des phenomenes metasomatiques. La composition des beryls alcalins cristallisant dans ces memes corps pegmatitiques confirme que la composition du fluide definie experimentalement est tout a fait realiste. Elle explique la constante des rapports entre les alcalins dans les autres mineraux qui piegent ces elements dans leur structure. On montre que l'entropie d'exces de melange des fluides est importante du fait des changements tres faibles de concentrations entre 450 et 600#oc
APA, Harvard, Vancouver, ISO, and other styles
9

Kar, Adityamoy. "Fluid inclusion and trace element studies of the gem pegmatites of Mt. Antero, Colorado." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02132009-170725/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Deveaud, Sarah. "Caractérisation de la mise en place des champs de pegmatites à éléments rares de type LCT : exemples représentatifs de la chaîne Varisque." Thesis, Orléans, 2015. http://www.theses.fr/2015ORLE2049/document.

Full text
Abstract:
Les pegmatites à éléments rares de type LCT sont depuis longtemps étudiées et exploitées pour leurs gemmes et les métaux rares qu’elles contiennent. Malgré de nombreuses études réalisées sur les processus d’enrichissement en éléments rares, ou les mécanismes à l’origine de leurs textures, très peu d’études ont été dédiées aux mécanismes de mise en place des pegmatites et à leur répartition spatiale à l’échelle du champ. Afin de déterminer les mécanismes moteurs à l’origine de l’ascension de ces magmas, une étude multidisciplinaire a été menée sur 3 champs de pegmatites à éléments rares, répartis à l’échelle de la chaîne Varisque. Les résultats démontrent la proximité entre la localisation des pegmatites minéralisées et l’intensité de la déformation encaissante. De plus, la mise en place de ces magmas semble facilitée par un certain mode de fracturation. La modélisation numérique de la mise en place des magmas dans ces zones crustales fragilisées indique que l’ascension est facilitée par leurs faibles viscosité et densité, mais aussi par des perméabilités crustales très élevées (> 10⁻¹² m²), à des profondeurs de l’ordre de 10 km. Enfin, d’après les signatures isotopiques du Li mesurées sur des micas pegmatitiques, le lithium ne fractionne pas depuis le granite voisin, jusqu’aux pegmatites les plus différenciées, puisque les valeurs δ⁷Li (‰) sont toutes comprises dans une gamme de - 2 à + 2 ‰, similaire à celle rencontrée dans les granites orogéniques. Nous suggérons donc que la genèse des magmas pegmatitiques est commune à celle des granites hyperalumineux. Les mécanismes de fracturation et d’attraction (« magma-pumping ») sont envisagés pour avoir favorisé l’ascension de ces magmas résiduels, enrichis en éléments rares, de faibles volumes, au cours de transitions brutales et de courtes durées (~ 10³ ans), de la perméabilité. L’ensemble de ces résultats permet de remettre en question le modèle du granite parent classiquement utilisé pour la prospection de ces gisements, et de proposer un modèle revisité couplant la genèse et la mise en place de ces magmas
LCT-type rare-element pegmatites have long been studied and exploited for their gems and rare metals they contain. Despite many studies about the rare-element enrichment, or about the mechanisms leading their exotic textures, very few studies have been dedicated to the mechanisms controlling their emplacement and their spatial distribution at the scale of the pegmatite field. To better investigate the origin of ascent-driving mechanisms of these magmas, a multidisciplinary study was conducted on 3 rare-element pegmatite fields across the Variscan belt. The results demonstrate the spatial proximity of the rare-metals-rich pegmatites with the intensity of deformation of the hosting rocks. In addition, spatial statistical analyses suggest that the emplacement of such magmas has been facilitated by fracture-controlled model. According to numerical models, the rise of these pegmatite-forming melts along weakened crustal zones would be facilitated by their peculiar physico-chemical properties (low viscosity and density), but also by very high crustal permeability (> 10⁻¹² m²) at depths around 10 km. Finally, accordingly to Li isotope signatures measured on pegmatitic micas, lithium does not fractionate from neighbouring granite up to the more differentiated pegmatites, since all δ⁷Li (‰) fall within a range of - 2 to + 2 ‰, as for orogenic granites. Therefore, we suggest that the genesis these pegmatite-forming melts is common to that of peraluminous granites. Mechanisms of fracturation and magma-pumping may have favoured the rise of these low volumes of residual melts, enriched in rare-elements, during short periods (~ 10³ yrs) of strong permeability increase. These results question the granitic model commonly used for the exploration of this type of mineral deposits. We suggest a revisited model accounting for both genesis and emplacement controlling mechanisms of the pegmatite-forming melts
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Pegmatites"

1

Mikhaĭlovich, Sokolov I͡U︡riĭ, Institut geologii i geokhronologii dokembrii͡a︡ (Akademii͡a︡ nauk SSSR), and International Geological Correlation Programme. Proekt no. 247 "Dokembriĭskie rudnye mestorozhdenii͡a︡ i ikh svi͡a︡zʹ s tektonicheskimi strukturami", eds. Kompleksnye poiskovye kriterii sli͡u︡donosnykh pegmatitov Belomorʹi͡a︡: Petrologo-geofizicheskai͡a︡ modelʹ lokalizat͡s︡ii mestorozhdeniĭ muskovita. Leningrad: "Nauka," Leningradskoe otd-nie, 1988.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

A, Popov V. Ilmeny Mountains: Mineralogy of pegmatites. Moscow, Russia: Association Ecost, 2006.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Popov, V. A. Kopʹ Mokrusha: Ocherk istorii osvoenii︠a︡ i mineralogii︠a︡. Miass: In-t mineralogii UrO RAN, 1999.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

N, Sapozhnikova L., and Tkachev A. V, eds. Granitnye pegmatity: Problemy geologicheskoĭ teorii i praktiki. Moskva: VIMS, 2008.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Matveevich, Shmakin Boris, and Zagorskiĭ V. E, eds. Granitnye pegmatity: V pi͡a︡ti tomakh. Novosibirsk: "Nauka", 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Hann, Horst Peter. Pegmatitele din Carpații Meridionali. București: Editura Academiei Republicii Socialiste România, 1987.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Shmakin, Boris Matveevich. Pegmatitovye mestorozhdenii͡a︡ zarubezhnykh stran. Moskva: "Nedra", 1987.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Hann, Horst Peter. Pegmatitele din Carpații Meridionali. București: Editura Academiei Republicii Socialiste România, 1987.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Ivanov, M. A. Fat͡s︡ii muskovitovykh pegmatitov Sibiri: Severo-Baĭkalʹskai͡a︡ i Vostochno-Sai͡a︡nskai͡a︡ provint͡s︡ii. Sankt-Peterburg: Sankt-Peterburgskiĭ gos. gornyĭ in-t im. G.V. Plekhanova, 1999.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Larsen, Alf Olav. The Langesundsfjord: History, geology, pegmatites, minerals. Salzhemmendorf: Bode, 2010.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Pegmatites"

1

Okrusch, Martin, and Hartwig E. Frimmel. "Pegmatites." In Springer Textbooks in Earth Sciences, Geography and Environment, 371–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-57316-7_22.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Singh, Yamuna. "Pegmatites." In Society of Earth Scientists Series, 269–309. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-41353-8_7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Kunasz, Thor. "Lithium Pegmatites." In The Lithium Legacy, 49–69. New York: Jenny Stanford Publishing, 2023. http://dx.doi.org/10.1201/9781003372363-6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Keller, Peter C. "Gemstones Formed in Pegmatites: Gem Pegmatites of Minas Gerais, Brazil." In Gemstones and Their Origins, 57–69. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-6674-4_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Dittrich, Thomas, Thomas Seifert, Bernhard Schulz, Steffen Hagemann, Axel Gerdes, and Jörg Pfänder. "Geochemistry of LCT Pegmatites." In SpringerBriefs in World Mineral Deposits, 77–86. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-10943-1_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Dittrich, Thomas, Thomas Seifert, Bernhard Schulz, Steffen Hagemann, Axel Gerdes, and Jörg Pfänder. "Geochronology of Archean LCT Pegmatites." In SpringerBriefs in World Mineral Deposits, 87–94. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-10943-1_5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Černý, P. "Evolution of Feldspars in Granitic Pegmatites." In Feldspars and their Reactions, 501–40. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1106-5_13.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Dittrich, Thomas, Thomas Seifert, Bernhard Schulz, Steffen Hagemann, Axel Gerdes, and Jörg Pfänder. "Introduction to Archean Rare-Metal Pegmatites." In SpringerBriefs in World Mineral Deposits, 1–21. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-10943-1_1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Černý, Petr. "10. Mineralogy of Beryllium in Granitic Pegmatites." In Beryllium, edited by Edward S. Grew, 405–44. Berlin, Boston: De Gruyter, 2002. http://dx.doi.org/10.1515/9781501508844-011.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Dittrich, Thomas, Thomas Seifert, Bernhard Schulz, Steffen Hagemann, Axel Gerdes, and Jörg Pfänder. "Geological Settings of Archean Rare-Metal Pegmatites." In SpringerBriefs in World Mineral Deposits, 23–59. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-10943-1_2.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Pegmatites"

1

Pavlidis, Sofia Borisovna. "GEOLOGICAL AND GENETIC FEATURES CHAMBER PEGMATITES." In IV Международная научно-практическая конференция "Научные исследования и инновации". KDU, Moscow, 2021. http://dx.doi.org/10.31453/kdu.ru.978-5-7913-1168-9-2021-45-49.

Full text
Abstract:
This article is devoted to the analysis of the genetic features of chamber pegmatites of Volyn. The author dwells in detail on their mineral composition, describes the connection of pegmatites with containing rocks. Special attention in the work is paid to pegmatite formation, the stages of formation of chamber pegmatites.
APA, Harvard, Vancouver, ISO, and other styles
2

Modreski, Peter J. "Pegmatites and pegmatite districts of New Mexico." In 27th Annual New Mexico Mineral Symposium. Socorro, NM: New Mexico Bureau of Geology and Mineral Resources, 2006. http://dx.doi.org/10.58799/nmms-2006.308.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Calin, N., C. Constantina, and D. Perta. "NEW DATA ON MINERALS WITH ECONOMIC POTENTIAL PRESENT IN LITHIUM PEGMATITES FROM CON?U � NEGOVANU, CIBIN (CINDREL) MOUNTAINS, CENTRAL GROUP, SOUTHERN CARPATHIANS, ROMANIA." In 23rd SGEM International Multidisciplinary Scientific GeoConference 2023. STEF92 Technology, 2023. http://dx.doi.org/10.5593/sgem2023/1.1/s01.11.

Full text
Abstract:
In this paper will discuss the minerals present in pegmatites, seen as a way of storing chemical elements, important from an economic point of view. The study area is called Con?u - Negovanu, and is located between the two mountain massifs known as Cindrel (Cibin) and Lotru Mountains. Muscovite (seen as a possible indicator for lithium in Con?u � Negovanu pegmatites), one of the important minerals alongside quartz, spodumene, and albite cleavelandite variety, is probably the mineral that includes in its structure chemical elements: Fe3+, Fe2+, Mg2+, Mn2+, Ti, Li, Nb, Ta, Sn, Ce, K, Na, Ca2+ which tend to materialize in minerals such as triphylite - lithiophilite, ferrisicklerite, heterosite - purpurite, amblygonite � montebrasite, "ferrogatehouseite", fluorapatite, hydroxylapatite, vivianite, wolfeite, maricite, monazite, cassiterite, titanite, spodumene, cookeite. In addition to these, we indicate beryl, scarce schorl, uraninite, garnets, kyanite, staurolite and columbite - group minerals. Phyllosilicates viewed through the mineralogical prism of pegmatites provide information on crystallization, mainly temperature (the presence of the 2M1 polytype indicates a high temperature) and the evolution pressure of pegmatitic melts. Plagioclase (oligoclase and albite) is partially or replaced by muscovite and quartz - a stable association in the later stages of pegmatites, following the crystallization of microcline by reducing the formation of muscovite, and if there is an increase in water content, the proportion changes, the microcline is partially or replaced of muscovite. Chemical analysis: EPMA indicates in muscovite the presence of FeO with an average value of 1.44 %, and Na2O with an average value of 0.44 %, fluorine occurs in proportions with values from 0.04 to 0.30 %.
APA, Harvard, Vancouver, ISO, and other styles
4

Oitseva, T., M. Mizernaya, O. Kuzmina, A. Bissatova, and N. Zimanovskaya. "ZONED RARE-METAL MINERALIZATION IN THE CENTRAL KALBA AREA (EAST KAZAKHSTAN)." In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022/1.1/s01.008.

Full text
Abstract:
Currently the resources of rare metals, especially Ta, Nb, Be, and Li used in high-tech industries, are of great demand in Kazakhstan and worldwide. Main Ta, Nb, Be, Li, Sn, and W deposits in the Great Altai territory are hosted by Permian granitic belts that formed during the Late Paleozoic-Early Mesozoic orogeny, in a postcollisional setting. The largest metallogenic structure of the Kalba-Narym granitoid belt accommodates many genetically different deposits and occurrences. Pegmatitic rare-metal deposits have vertically and laterally zoned distribution patterns, with mineralization mostly localized in the tectonically active Central Kalba ore district. The richest spodumene and pollucite pegmatites are located in the upper parts of the ore zone. The mineralization types make up the following sequence: barren oligoclase-microcline pegmatites followed by microcline-quartz-muscovite (Nb, Be), microcline-albite (Ta, Sn, Be), albite (Ta, Nb, Be, Sn), albite-spodumene greisen (Li, Ta, Be, Sn), and cleavelandite-lepidolite-pollucite-spodumene (Ta, Li, Cs, Sn) zones. The zoned patterns of rare-metal mineralization have to be taken into account in further studies.
APA, Harvard, Vancouver, ISO, and other styles
5

Simmons, Williams, Alexander Falster, Karen Webber, Myles Felch, and Dwight Bradley. "Lithium-Boron-Beryllium Gem Pegmatites, Oxford Co., Maine: Havey and Mount Mica Pegmatites." In New England Intercollegiate Geological Conference. Bates College, 2017. http://dx.doi.org/10.26780/2017.001.0002.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Shaw, Richard, Jeremy Rushton, Simon Kemp, Nick M. W. Roberts, Simon Tapster, Kathryn Goodenough, Adam Moodley, Roger Tyler, and Brian Ruzvidzo. "Contrasting paragenetic evolution of lithium pegmatites: evidence from the Kamativi and Arcadia Pegmatites, Zimbabwe." In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.19446.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

London, David. "ORE-FORMING PROCESSES WITHIN GRANITIC PEGMATITES." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-276841.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Oitseva, T., M. Mizernaya, and O. Kuzmina. "PROSPECTS OF THE MEDVEDKO-AKHMETKINSKY ORE FIELD FOR RARE METAL LITHIUM MINERALIZATION (EAST KAZAKHSTAN)." In 23rd SGEM International Multidisciplinary Scientific GeoConference 2023. STEF92 Technology, 2023. http://dx.doi.org/10.5593/sgem2023/1.1/s01.15.

Full text
Abstract:
Lithium is a fast growing sector. It is used in the production of lithium-ion batteries, which are widely used in smartphones, laptops, electric vehicles such as hybrid cars, electric vehicles or e-bikes. The need for this element is dictated by modern demand. The main deposits of lithium, known in Kazakhstan, were explored back in Soviet times, and since then not everyone understood the need for this metal, they were mothballed as a strategic reserve. Such objects include the Medvedka, Akhmetkino deposits, the Shozhe, Lukon, Skalistoye ore occurrence, etc., located within the Medvedko-Akhmetkinsky ore field. The ore field belongs to the central part of the Karagoin-Saryozek pegmatite zone, the Kalba-Narym granitoid belt. Within the field, the main favorable factors for the placement of rare-metal mineralization are considered: geological-structural (tectonic disturbances and ore-bearing environment) and mineralogical-geochemical (indicator minerals of lithium-bearing pegmatites and geochemical elements Li, Rb, Cs, Ta, Nb).
APA, Harvard, Vancouver, ISO, and other styles
9

Hernández Filiberto, Lorena, M. Encarnación Roda-Robles, William Simmons, and Karen Webber. "Garnet chemistry as an exploration tool for Li-pegmatites in the Oxford pegmatite field (Maine, USA)." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.6218.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Goodenough, Kathryn, Richard Shaw, Paul Nex, and Judith Kinnaird. "Genesis and Evolution of Lithium Pegmatites – African Examples." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.861.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Pegmatites"

1

McClenaghan, M. B., D. M. Brushett, C. E. Beckett-Brown, R. C. Paulen, J. M. Rice, A. Haji Egeh, and A. Nissen. Indicator mineral studies at the Brazil Lake LCT Pegmatites, southwest Nova Scotia. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331686.

Full text
Abstract:
Indicator mineral research is currently being undertaken in partnership with the Nova Scotia Department of Natural Resources and Renewables at the Brazil Lake lithium-cesium-tantalum (LCT) pegmatites in southwest Nova Scotia as part of the Geological Survey of Canada's Targeted Geoscience Initiative(TGI) program. The pegmatites, discovered in 1960, are well known from previous detailed bedrock mapping and surficial studies, and are informally named based on their relative geographic positions as the South and North pegmatites. The South pegmatite naturally outcrops, and both pegmatites are surrounded by spodumene-rich boulders on the surface of the thin-till covered (&amp;lt;4 m) drumlinized glacial landscape. For these reasons, the pegmatites are excellent sites to test indicator mineral exploration methods for Li and associated critical elements (e.g. Ce, Ta). Five pegmatite samples were collected for detailed study and analysis of potential indicator minerals. Close to the pegmatite and up to 13 km down ice (south-southeast), 87 bulk (10-14 kg), till sediment samples were collected for indicator mineral analysis. A total of 105 till samples were collected around the pegmatite and across the region for matrix geochemistry. A preliminary list of indicator minerals includes mid-density (e.g., spodumene, tourmaline, blue apatite) and high-density mineral species (e.g., columbite-tantalite, cassiterite) and this list is expected to expand as the detailed studies progress. Trenches dug in the Fall 2022 to collect till samples on the proximal down ice (south) sides of both pegmatites revealed abundant spodumene pebbles and small cobbles in the till, indicating that the local till should display strong indicator mineral and matrix geochemical signatures derived from the pegmatites.
APA, Harvard, Vancouver, ISO, and other styles
2

Jacques, I. J., A. J. Anderson, and S. G. Nielsen. The geochemistry of thallium and its isotopes in rare-element pegmatites. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328983.

Full text
Abstract:
The Tl isotopic and trace element composition of K-feldspar, mica, pollucite and pyrite from 13 niobium-yttrium-fluorine (NYF)-type and 14 lithium-cesium-tantalum (LCT)-type rare-element pegmatites was investigated. In general, the epsilon-205Tl values for K-feldspar in NYF- and LCT-type pegmatites increases with increasing magmatic fractionation. Both NYF and LCT pegmatites display a wide range in epsilon-205Tl (-4.25 to 9.41), which complicates attempts to characterize source reservoirs. We suggest 205Tl-enrichment during pegmatite crystallization occurs as Tl partitions between the residual melt and a coexisting aqueous fluid or flux-rich silicate liquid. Preferential association of 205Tl with Cl in the immiscible aqueous fluid may influence the isotopic character of the growing pegmatite minerals. Subsolidus alteration of K-feldspar by aqueous fluids, as indicated by the redistribution of Cs in K-feldspar, resulted in epsilon-205Tl values below the crustal average (-2.0 epsilon-205Tl). Such low epsilon-205Tl values in K-feldspar is attributed to preferential removal and transport of 205Tl by Cl-bearing fluids during dissolution and reprecipitation. The combination of thallium isotope and trace element data may be used to examine late-stage processes related to rare-element mineralization in some pegmatites. High epsilon-205Tl and Ga in late-stage muscovite appears to be a favorable indicator of rare-element enrichment LCT pegmatites and may be a useful exploration vector.
APA, Harvard, Vancouver, ISO, and other styles
3

Sinclair, W. D. Granitic pegmatites. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/208026.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Sinclair, W. D. Pegmatites granitiques. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/208027.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Benn, D., R. Linnen, and T. Martins. Evaluating white mica as an indicator mineral for lithium bearing pegmatites, Wekusko Lake pegmatite field, Manitoba, Canada. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328982.

Full text
Abstract:
This project investigates the potential use of white micas as an indicator mineral within Li-bearing pegmatites and the potential of field portable techniques, such as Raman spectroscopy and Laser Induced Breakdown Spectroscopy (LIBS) as real-time techniques in exploration. The pegmatites in the Wekusko Lake field, Manitoba, Canada, display five zones of varying mineralization. White micas display two textures in the field (primary igneous and secondary) and four textures were identified by backscattered electron imaging (poor zonation, rimmed, patchy and exsolution). The white micas were analysed by Electron Probe Micro-Analysis (EPMA) and Laser Ablation Induction-Coupled Plasma Mass Spectroscopy (LA-ICP-MS) and the results show a strong correlation in the Li content of the white mica and the whole rock Li2O obtained from the assays of drill core. The K/Rb vs. Cs contents of the white mica indicate that the most prospective dikes contain moderate to highly evolved grains. The use of portable Raman Spectrometer, while useful for mineral identification, was not able to detect a significant Li signature at the concentrations tested (1500-6000 ppm).
APA, Harvard, Vancouver, ISO, and other styles
6

Brushett, D. M., C. E. Beckett-Brown, M. B. McClenaghan, R. C. Paulen, J. M. Rice, A. Haji Egeh, and P. Pelchat. Till geochemical data for the Brazil Lake pegmatite area, southwest Nova Scotia, Canada (NTS 21-A/04, 20-O/16 and 20-P/13): samples collected in 2020, 2021, and 2022. Natural Resources Canada/CMSS/Information Management, 2024. http://dx.doi.org/10.4095/332384.

Full text
Abstract:
This open file reports geochemical data for till samples collected as a part of a till geochemical and surficial mapping project around the Brazil Lake lithium-cesium-tantalum (LCT-type) pegmatite in southwestern Nova Scotia (NTS map sheets 21A/04, 20O/16 and 20P/13). The global rise in lithium demand has motivated the Geological Survey of Canada's (GSC) recent investigations of the Brazil Lake pegmatites to study surficial geochemistry methods that can be used to explore for lithium and associated critical minerals (i.e., Cs, Ta, Be, In, Sn, W). These types of deposits are important sources of lithium, tin, and rubidium and the primary source of tantalum. This research at Brazil Lake is being undertaken as part of the GSC's Targeted Geoscience Initiative Program and has been carried out in partnership with the Nova Scotia Department of Natural Resources and Renewables (NSDNRR). The goals of the research are to increase exploration success in regions covered by glacial sediments by documenting how critical minerals and associated elements are glacially dispersed in till from pegmatites at the Brazil Lake property. Newly available LiDAR data assisted in deciphering ice flow trajectories, which in turn, allowed for targeted till sampling. A total of 184 till samples were collected for till geochemistry in 2020, 2021 and 2022 and the data reported here include widely spaced regional samples collected across southwest Nova Scotia, proximal samples collected up-ice, overlying, and down-ice of the Brazil Lake pegmatites. The widely spaced till samples provide the regional context for the interpretation of the case study samples and assess the potential for additional pegmatites buried by extensive till cover. Data reported in this Open File include sample descriptions, location, site photos, and geochemical analyses of the coarse sand (1.0 - 2.0 mm) and silt + clay (&amp;lt;0.063 mm) fractions. For the 2020 samples only, the &amp;lt;0.002 mm (clay) fraction was also analyzed. Analyses over the 3 years (2020-2021-2022) include various combinations of different digestions or fusions to test and compare their efficacy for the various pathfinder elements for LCT pegmatites: aqua regia (partial) digestion, 2) Na peroxide fusion (total), 3) 4-acid (near total) digestion, 4) Li-meta/tetraborate fusion, 5) loss on ignition, and 6) portable X-ray fluorescence (XRF).
APA, Harvard, Vancouver, ISO, and other styles
7

Tomascak, P., and P. Cerny. Granitic Pegmatites in the Aylmer Lake Basin. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/133318.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Cawood, T. K., and J. M. Peter. The geology of critical battery metals: a spotlight on Co in VMS deposits and Li in pegmatites. Natural Resources Canada/CMSS/Information Management, 2024. http://dx.doi.org/10.4095/332348.

Full text
Abstract:
As we move away from a fossil fuel-driven economy, the demand for metals used in energy-dense, rechargeable batteries is increasing; these include cobalt and lithium. Although cobalt is mostly obtained as a by-product from nickel and copper mining, significant amounts also occur in volcanogenic massive sulfide (VMS) deposits, of which Canada has many. However, the primary controls on cobalt distribution in VMS deposits are poorly understood, and may be affected by deformation and metamorphism. We show that cobalt can occur in pyrite, which retains its primary composition through greenschist facies metamorphism; and in pyrrhotite, which expels some cobalt during deformation to form cobaltite crystals. In contrast, most of the global lithium supply is derived from rare metal pegmatites and salars, with pegmatites the most important Canadian source. Our preliminary results confirm that lithium-bearing pegmatites can form directly during anatexis, as well as from fractional crystallization of large bodies of granitic magma.
APA, Harvard, Vancouver, ISO, and other styles
9

McClenaghan, M. B., D. M. Brushett, R. C. Paulen, C. Beckett-Brown, J M Rice, A. Haji Egeh, and A. Nissen. Critical metal indicator mineral studies of till samples collected around the Brazil Lake LCT pegmatite, southwest Nova Scotia. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331537.

Full text
Abstract:
This report describes field work carried out as part of the Geological Survey of Canada's Targeted Geoscience Initiative indicator mineral research activities at the Brazil Lake Li-Cs-Ta pegmatites in southwest Nova Scotia. This research is being undertaken in partnership with the Nova Scotia Department of Natural Resources and Renewables (NSDNRR). In the fall of 2022, 44 till samples were collected around and down-ice of the Brazil Lake Li-Cs-Ta pegmatites to document the geochemical and indicator mineral signatures of the pegmatites in the till. In 2020, 2021, and earlier in the summer of 2022, 105 till samples were collected across southwest Nova Scotia by the NSDNRR to provide regional context for the interpretation of the 44 case study samples. Till samples were also collected at the Salmon River beach section ~25 km north of Yarmouth where a thick coastal exposure (&amp;gt; 20 m) contains multiple till units that reflect several phases of glacial deposition and shifting ice-flow directions across southwest Nova Scotia. These section samples will provide insight and additional details on the regional glacial context.
APA, Harvard, Vancouver, ISO, and other styles
10

McClenaghan, M. B., D. M. Brushett, C. E. Beckett-Brown, R. C. Paulen, J. M. Rice, and C. E. White. Indicator-mineral signatures of the Brazil Lake lithiumcesium- tantalum pegmatites, southwest Nova Scotia (parts of NTS 20-O/16, 20P/13, 21A/04, and 21B/01). Natural Resources Canada/CMSS/Information Management, 2024. http://dx.doi.org/10.4095/ph79gkgx0u.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Pegmatites' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography