Relevant bibliographies by topics / Alkalic igneous rocks Geology

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Academic literature on the topic 'Alkalic igneous rocks Geology'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "Alkalic igneous rocks Geology"

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Watson, Ken, Lawrence C. Rowan, Timothy L. Bowers, Carmen Anton‐Pacheco, Pablo Gumiel, and Susanne H. Miller. "Lithologic analysis from multispectral thermal infrared data of the alkalic rock complex at Iron Hill, Colorado." GEOPHYSICS 61, no. 3 (May 1996): 706–21. http://dx.doi.org/10.1190/1.1443998.

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Airborne thermal‐infrared multispectral scanner (TIMS) data of the Iron Hill carbonatite‐alkalic igneous rock complex in south‐central Colorado are analyzed using a new spectral emissivity ratio algorithm and confirmed by field examination using existing 1:24 000‐scale geologic maps and petrographic studies. Color composite images show that the alkalic rocks could be clearly identified and that differences existed among alkalic rocks in several parts of the complex. An unsupervised classification algorithm defines four alkalic rock classes within the complex: biotitic pyroxenite, uncompahgrite, augitic pyroxenite, and fenite + nepheline syenite. Felsic rock classes defined in the surrounding country rock are an extensive class consisting of tuff, granite, and felsite, a less extensive class of granite and felsite, and quartzite. The general composition of the classes can be determined from comparisons of the TIMS spectra with laboratory spectra. Carbonatite rocks are not classified, and we attribute that to the fact that dolomite, the predominant carbonate mineral in the complex, has a spectral feature that falls between TIMS channels 5 and 6. Mineralogical variability in the fenitized granite contributed to the nonuniform pattern of the fenite‐nepheline syenite class. The biotitic pyroxenite, which resulted from alteration of the pyroxenite, is spatially associated and appears to be related to narrow carbonatite dikes and sills. Results from a linear unmixing algorithm suggest that the detected spatial extent of the two mixed felsic rock classes was sensitive to the amount of vegetation cover. These results illustrate that spectral thermal infrared data can be processed to yield compositional information that can be a cost‐effective tool to target mineral exploration, particularly in igneous terranes.
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Hakim, Fahmi, Yanuardi Satrio Nugroho, Cendi Diar Permata Dana, and Anastasia Dewi Titisari. "Geology and Petrogenesis of Igneous Rocks from Batur Paleovolcano, Gunungkidul, Yogyakarta: Evidence from their Textures, Mineralogy, and Major Elements Geochemistry." Journal of Applied Geology 4, no. 1 (August 14, 2019): 32. http://dx.doi.org/10.22146/jag.48739.

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Batur paleovolcano is located in Wediombo Beach area, Gunungkidul Regency, Yogyakarta and is being part of Wuni Formation. Several volcanic products including lava flow, autoclastic breccia and volcanic breccia can be found associated with diorite intrusions. This research is aimed to characterize geological, mineralogical andgeochemical variations of igneous rocks from Batur paleovolcano to understand its petrogenesis. Detailed geological mapping with scale of 1:12,500 is conducted to identify geological aspects and delineate igneous rocks distributions. Igneous rocks and selected wall rocks samples were prepared for laboratory analysis including 8 samples for petrography and 5 samples for ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry) analysis. Several geochemical data from previous study are also added to investigate the geochemical variations. Geological condition of the research area consists of four rock units including colluvial deposit, limestone, andesite lava and diorite intrusion. Geological structures found are normal fault and shear joint where the main stress direction is north–south. Petrography analysis showed that igneous rocks in this research area consist of diorite intrusion and andesite lava with phorphyritic texture. Plagioclase become the most abundant minerals found both as phenocryst phase and groundmass. Hornblende only occur as phenocryst phase in minor amounts as accesory mineral. Major elementsgeochemistry analysis showed the rocks are characterized by intermediate silica with low alkali content. They are can be categorized as calc-alkaline series. However, some samples are fall into tholeiitic series. Major elements variation and textural study also indicate the magma is experienced differentiation process by fractional crystallization mechanism. This study suggests that igneous rocks from Batur paleovolcano is formed by two phases of formation. Earlier phase is the formation of andesite lava in island arc tholeiitic tectonic setting then at the later phase is formation of diorite intrusion in the calc-alkaline basalts tectonic setting.
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Fitton, J. G., and B. G. J. Upton. "Alkaline igneous rocks: a review symposium." Journal of the Geological Society 142, no. 4 (July 1985): 697–708. http://dx.doi.org/10.1144/gsjgs.142.4.0697.

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Hurai, Vratislav, Monika Huraiová, and Patrik Konečný. "REE Minerals as Geochemical Proxies of Late-Tertiary Alkalic Silicate ± Carbonatite Intrusions Beneath Carpathian Back-Arc Basin." Minerals 11, no. 4 (March 31, 2021): 369. http://dx.doi.org/10.3390/min11040369.

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The accessory mineral assemblage (AMA) of igneous cumulate xenoliths in volcanoclastic deposits and lava flows in the Carpathian back-arc basin testifies to the composition of intrusive complexes sampled by Upper Miocene-Pliocene basalt volcanoes. The magmatic reservoir beneath Pinciná maar is composed of gabbro, moderately alkalic to alkali-calcic syenite, and calcic orthopyroxene granite (pincinite). The intrusive complex beneath the wider area around Fiľakovo and Hajnáčka maars contains mafic cumulates, alkalic syenite, carbonatite, and calc-alkalic granite. Both reservoirs originated during the basaltic magma underplating, differentiation, and interaction with the surrounding mantle and crust. The AMA of syenites is characterized by yttrialite-Y, britholite-Y, britholite-Ce, chevkinite-Ce, monazite-Ce, and rhabdophane(?). Baddeleyite and REE-zirconolite are typical of alkalic syenite associated with carbonatite. Pyrochlore, columbite-Mn, and Ca-niobates occur in calc-alkalic granites with strong peralkalic affinity. Nb-rutile, niobian ilmenite, and fergusonite-Y are crystallized from mildly alkalic syenite and calc-alkalic granite. Zircons with increased Hf/Zr and Th/U ratios occur in all felsic-to-intermediate rock-types. If rock fragments are absent in the volcanic ejecta, the composition of the sub-volcanic reservoir can be reconstructed from the specific AMA and zircon xenocrysts–xenolith relics disintegrated during the basaltic magma fragmentation and explosion.
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Nelson, Demian A., John M. Cottle, and Blair Schoene. "Butcher Ridge igneous complex: A glassy layered silicic magma distribution center in the Ferrar large igneous province, Antarctica." GSA Bulletin 132, no. 5-6 (October 26, 2019): 1201–16. http://dx.doi.org/10.1130/b35340.1.

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Abstract The Butcher Ridge igneous complex, Antarctica, is an ∼6000 km3 hypabyssal silicic intrusion containing rhythmically layered glassy rocks. Baddeleyite U-Pb geochronologic analysis on a sample of the Butcher Ridge igneous complex yielded an age of ca. 182.4 Ma, which confirms that it was emplaced synchronously with the Ferrar large igneous province. Rocks of the Butcher Ridge igneous complex vary from basaltic andesite to rhyolite, and so the inferred volume of the Butcher Ridge igneous complex makes it the most voluminous silicic component of the Ferrar large igneous province. Major-element, trace-element, and isotopic data combined with binary mixing, assimilation-fractional crystallization (AFC), and energy-constrained AFC models are consistent with formation of Butcher Ridge igneous complex silicic rocks by contamination of mafic Ferrar parental magma(s) with local Paleozoic plutonic basement rocks. Field and petrographic observations and evidence for alkali ion exchange suggest that the kilometer-long, meter-thick enigmatic rhythmic layering formed as a result of secondary hydration and devitrification of volcanic glass along parallel fracture networks. The regularity and scale of fracturing/layering imply a thermally driven process that occurred during shallow emplacement and supercooling of the intrusion in the upper crust. We suggest that layering observed in the Butcher Ridge igneous complex is analogous to that reported from terrestrial and Martian cryptodomes, and therefore it is an ideal locality at which to study layering processes in igneous bodies.
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Noble, S. R., R. D. Tucker, and T. C. Pharaoh. "Lower Palaeozoic and Precambrian igneous rocks from eastern England, and their bearing on late Ordovician closure of the Tornquist Sea: constraints from U-Pb and Nd isotopes." Geological Magazine 130, no. 6 (November 1993): 835–46. http://dx.doi.org/10.1017/s0016756800023190.

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AbstractThe U-Pb isotope ages and Nd isotope characteristics of asuite of igneous rocks from the basement of eastern England show that Ordovician calc-alkaline igneous rocks are tectonically interleaved with late Precambrian volcanic rocks distinct from Precambrian rocks exposed in southern Britain. New U-Pb ages for the North Creake tuff (zircon, 449±13 Ma), Moorby Microgranite (zircon, 457 ± 20 Ma), and the Nuneaton lamprophyre (zircon and baddeleyite, 442 ± 3 Ma) confirm the presence ofan Ordovician magmatic arc. Tectonically interleaved Precambrian volcanic rocks within this arc are verified by new U-Pb zircon ages for tuffs at Glinton (612 ± 21 Ma) and Orton (616 ± 6 Ma). Initial εNd values for these basement rocks range from +4 to - 6, consistent with generation of both c. 615 Ma and c. 450 Ma groups of rocksin continental arc settings. The U-Pb and Sm-Nd isotope data support arguments for an Ordovician fold/thrust belt extending from England to Belgium, and that the Ordovician calc-alkaline rocks formed in response to subductionof Tornquist Sea oceanic crust beneath Avalonia.
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Pivarunas, Anthony F., and Joseph G. Meert. "Protracted magmatism and magnetization around the McClure Mountain alkaline igneous complex." Lithosphere 11, no. 5 (June 27, 2019): 590–602. http://dx.doi.org/10.1130/l1062.1.

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Abstract The McClure Mountain–Iron Mountain igneous complex is an alkalic intrusive center in the northern Wet Mountains of southern Colorado. It was emplaced in early Cambrian time into gneissic/granitic 1.75–1.45 Ga Proterozoic host rocks. Numerous dikes are associated with the complex, primarily along the western side. Although the main intrusive nepheline-syenite body is well dated, the ages of the surrounding dikes are poorly known. Crosscutting relationships and poorly defined K-Ar dates suggest that the dikes are younger than the main intrusion. Paleomagnetic samples were collected from dikes associated with the McClure Mountain igneous complex. Geochronologic samples were also collected from two dikes sampled for their paleomagnetism. We obtained U-Pb zircon ages of 526 ± 8 Ma for a lamprophyric extracomplex dike and 483 ± 2 Ma for a trachytic extracomplex dike. These ages suggest either multistage or protracted dike intrusion around the ca. 524 Ma McClure Mountain complex. Our paleomagnetic data are consistent with previously published results. Dikes of the complex primarily exhibit southeast and shallow paleomagnetic directions, with variable declinations. Results from several baked contact tests indicate that the magnetizations are secondary. A steeply inclined magnetization is pervasive and was acquired over a protracted interval from late Laramide time to the present day.
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Mollai, Habib, Georgia Pe-Piper, and Rahim Dabiri. "Genetic relationships between skarn ore deposits and magmatic activity in the Ahar region, Western Alborz, NW Iran." Geologica Carpathica 65, no. 3 (June 1, 2014): 209–27. http://dx.doi.org/10.2478/geoca-2014-0015.

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Abstract Paleocene to Oligocene tectonic processes in northwest Iran resulted in extensive I-type calc-alkaline and alkaline magmatic activity in the Ahar region. Numerous skarn deposits formed in the contact between Upper Cretaceous impure carbonate rocks and Oligocene-Miocene plutonic rocks. This study presents new field observations of skarns in the western Alborz range and is based on geochemistry of igneous rocks, mineralogy of the important skarn deposits, and electron microprobe analyses of skarn minerals. These data are used to interpret the metasomatism during sequential skarn formation and the geotectonic setting of the skarn ore deposit related igneous rocks. The skarns were classified into exoskarn, endoskarn and ore skarn. Andraditic garnet is the main skarn mineral; the pyroxene belongs to the diopside-hedenbergite series. The skarnification started with pluton emplacement and metamorphism of carbonate rocks followed by prograde metasomatism and the formation of anhydrous minerals like garnet and pyroxene. The next stage resulted in retro gradation of anhydrous minerals along with the formation of oxide minerals (magnetite and hematite) followed by the formation of hydrosilicate minerals like epidote, actinolite, chlorite, quartz, sericite and sulfide mineralization. In addition to Fe, Si and Mg, substantial amounts of Cu, along with volatile components such as H2S and CO2 were added to the skarn system. Skarn mineralogy and geochemistry of the igneous rocks indicate an island arc or subduction-related origin of the Fe-Cu skarn deposit.
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Lykhin, D. A., V. V. Yarmolyuk, and A. A. Vorontsov. "Age, composition and sources of rocks and ores of the Okunevskoe fluorite-leucophanite deposit, Western Sayan: assessment of the contribution of magmatism to ore mineralization." Геология рудных месторождений 61, no. 5 (November 18, 2019): 37–61. http://dx.doi.org/10.31857/s0016-777061537-61.

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The paper presents data on the structure of the Okunevskoe fluorite-Leucophanite deposit, located within the Early Paleozoic rare-metal East Sayan rare metal metallogenic zone. The deposit is controlled by alkali granitoids, with ore mineralization concentrated at the contact of granitoids and host carbonates. It is represented by leucophanite-fluorite and pyroxene-fluorite ore types. The Ar-Ar age of granitoids is established at ~485Ma. Geochemical characteristics of igneous rocks, ores, and host carbonates are determined. It is shown that in geochemical parameters leucophanite-fluorite ores are close to alkaline granites, while pyroxene-fluorite ores are close to alkaline syenites. The characteristics of the Nd isotop composition in rocks and ores of the deposit are given. Igneous rocks (granitoids and basite dikes) are characterized byNd (t) values from +4 to +5.5. TheNd (t) values in ores range from +1.2 to+4.2, in skarns itis +4.8. The host carbonates have abruptly contrasting valuesNd (t) = 4.2. Based on these data, which demonstrate a high compositional similarity between granitoids and ores, aconclusion is drawn about the leading contribution from magmatic processes to the ore mineralization of the Okunevskoe deposit.
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Phillips, E. R., R. P. Barnes, R. J. Merriman, and J. D. Floyd. "The tectonic significance of Ordovician basic igneous rocks in the Southern Uplands, southwest Scotland." Geological Magazine 132, no. 5 (September 1995): 549–56. http://dx.doi.org/10.1017/s001675680002121x.

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AbstractIn the northern part of the Southern Uplands, restricted volumes of basic igneous rocks occur at or near the base of the Ordovician sedimentary strata. These rocks have previously been interpreted as ocean-floor tholeiites representative of the subducted Iapetus oceanic plate, preserved as tectonic slivers in a fore-arc accretionary prism. The alternative, back-arc basin model proposed for the Southern Uplands on sedimentological evidence raises questions over the origin of these rocks. New geochemical data and previously published data clearly indicate that the volcanic material does not have a simple single source. The oldest (Arenig) volcanic rocks from the Moffat Shale Group associated with the Leadhills Fault include alkaline within-plate basalts and tholeiitic lavas which possibly display geochemical characteristics of midocean ridge basalts. In the northernmost occurrence, alkaline and tholeiitic basalts contained within the Caradoc Marchburn Formation are both of within-plate ocean island affinity. To the south, in the Gabsnout Burn area, the Moffat Shale Group contains lenticular bodies of dolerite and basalt which have characteristics of island-arc to transitional basalts. This complex association of basaltic volcanic rocks is, at the present time, difficult to reconcile with either a simple fore-arc or back-arc setting for the Southern Uplands. However, the increasing arc-related chemical influence on basic rock geochemistry towards the southeast may tentatively be used in support of a southern arc-terrane, and as a result, a back-arc situation for the Southern Uplands basin. An alternative is that these volcanic rocks may represent the local basement to the basin and include remnants of an arc precursor to the Southern Uplands basin.
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Dissertations / Theses on the topic "Alkalic igneous rocks Geology"

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Johnson, Geoffrey I. "The petrology, geochemistry and geochronology of the felsic alkaline suite of the eastern Yilgarn Block, Western Australia /." Title page, contents and abstract only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phj67.pdf.

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Thesis (Ph. D.)--Dept. of Geology and Geophysics, University of Adelaide, 1992.
Typescript (Photocopy). Includes copies of 4 papers by the author as appendix 4 (v. 1). Errata slip inserted. Includes bibliographical references (leaves 170-192 (v. 1)).
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Bradshaw, Colin. "A petrographic, structural and geochemical study of the alkaline igneous rocks of the motzfeldt centre, south Greenland." Thesis, Durham University, 1988. http://etheses.dur.ac.uk/6446/.

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The Motzfeldt Centre (1310 +/- 31 MY) is one of four Gardar alkaline igneous Centres belonging to the Igaliko Nepheline syenite Complex, South Greenland. Motzfeldt is a multiphase, high-level intrusive ring-centre comprised principally of nepheline syenite and emplaced in the Proterozoic Julianehab granite and the overlying Gardar volcano-sedimentary succession. The Centre commenced with the intrusion of three poorly centralised satellitic intrusions of syenite, pulaskite and nepheline syenite, collectively known as the Geologfjeld Formation. These are partly truncated by concentric, multiple intrusions comprising the Motzfeldt Ring Series whose steep-sided contacts dip outwards and individual nepheline syenite units young inwards. On the basis of field relations, petrography and geochemistry the Ring Series is further subdivided into the Motzfeldt Sø and Flinks Dal Formations, and a number of minor intrusions collectively termed the Hypabyssal Series. The results of field surveys, carried out during two summer field seasons, are presented on a 1:50,000 geological map. The petrography and field relations are described for 16 distinct, plutonic and hypabyssal rock units which range in lithology from larvikite to lujavrite. These represent at least 10 separate intrusive episodes and show a remarkable array of rock textures, mineralogical and geochemical features.170 whole-rock (XRF), 33 Rare earth element (INAA) and over 300 mineral (EDS) geochemical analyses are presented. These show that the syenite/nepheline syenite lithologies in Motzfeldt can be subdivided chemically and mineralogically into the three groups: 'hypoalkaline', alkaline and peralkaline. The geochemical features of the various units are evaluated and elemental behaviour discussed. The data is additionally assessed, using non-parametric statistics, as a means of discriminating between the units. A number of units which have proved difficult to separate in the field are established to be geochemically distinct, whilst others are shown to be very closely associated. The peralkaline, pegmatite rich, silica saturated outer and upper margins of the Motzfeldt Sø Formation and its associated microsyenite sheet sequence, host extensive economic reserves of Nb, Ta, Zr, U, Th and LREE. The evolution of these mineralised zones is discussed and the importance of country rock (+ water) — magma interaction emphasised. Recent works have helped clarify the magmatic development of the Gardar Province. Here emphasis has been placed on the structural evolution of the Gardar with the aim of complementing these works. The Gardar represents a prolonged (c.200 MY), cyclic period of limited, passive intracontinental extension. Crustal thinning facilitated the rise, along deep fracture zones, of magmas generated by higher thermal gradients. In response to regional, sinistral shear stresses, ENE extensional fractures and associated dyking developed. In addition, crustal decoupling occurred along several parallel WNW-ESE sinistral strike-slip faults. Motzfeldt and other ring centres of the Gardar are preferentially located at the intersections of these zones of weakness.
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Liu, Junsuo. "Pétrogénèse des roches alcalines mafiques d'âge méso-cénozoique dans les provinces de Hunan et Guangxi, Chine septentrionale = petrogenesis of the mesosoic-cenozoic mafic alkaline subvolcanic rocks in Hunan-Guangxi provinces, southern China /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1992. http://theses.uqac.ca.

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Potgieter, J. E. "Anorogenic alkaline ring-type complexes of the Damaraland Province, Namibia, and their economic potential." Thesis, Rhodes University, 1987. http://hdl.handle.net/10962/d1001567.

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Anorogenic alkaline ring-type complexes form within continental plate settings. Alkaline magmatism is derived from the upper mantle, in which mantle metasomatism plays an important part, as well as from partial melting of the lower crust. Radial and concentric fractures develop during the ascent of alkaline magma. Extrusion of basic and felsic magma takes place along these fractures with felsic volcanics building-up central volcanoes. As a result of emptying of the magma chamber, the superstructure of the volcano collapses and a caldera is formed. During the caldera stage syenitic and granitic material are intruded into ring fractures. Alkaline ring-type complexes may be classified as (i) alkaline qranite and syenite-type and (ii) carbonatite and undersaturated-type. These ring-type complexes occur as distinct igneous provinces. Some major provinces occur in Brazil, Corsica, Namibia, Nigeria, Norway, Saudi-Arabia and Sudan. In Namibia the Damaraland igneous province is of Mesozoic aqe and it contains 15 alkaline ring-type complexes . These complexes are situated along north-eastern trends which correspond to transform directions of the South Atlantic. During the opening of the South Atlantic (Gondwana breakup) Pan-African age lineaments were reactivated which allowed emplacement of anorogenic alkaline magmatism. A zonation of alkaline granite and syenitetype in the west and carbonatite and undersaturated-type ring-complexes in the east correlates with down- and upwarp axes parallel to the line of Gondwana fragmentation. Alkali- and H⁺-metasomatism is related to the alkaline and syenite-type whereas alkali metasomatism (fenitization) is associated with carbonatite and undersaturated-type ring-complexes. Sn, W and Ta mineralization is associated with alkaline granites of some of the alkaline granite and syenite-type ring-complexes. Fe, F, PO₄ , Nb, Th, REE, Sr, Zn and Pb mineralization is associated with carbonatite complexes. Potential exists for: (i) porphyry Cu-Mo and epithermal-type (Au, Ag, Pt-metals, base metals) mineralization in the alkaline granite and syenite-type ring-complexes and (ii) disseminated Cu, Au, Aq and Pt-metals in carbonatite and undersaturated-type ring-complexes
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Esfarjani, H. R. "Engineering properties of basic igneous rocks." Thesis, University of Newcastle Upon Tyne, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374739.

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Smithies, Robert Hugh. "The geochemical evolution of three alkaline complexes in the Kuboos-Bremen igneous province, southern Namibia." Thesis, Rhodes University, 1992. http://hdl.handle.net/10962/d1005564.

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The Kuboos-Bremen Igneous Province comprises a linear zone of alkaline complexes that intrude Proterozoic and Pan-African rocks and trends in a northeast direction from the northwest of the Cape Province in South Africa into southern Namibia. Of the three most southerly complexes in Namibia. two comprise silicate rocks ranging from nepheline syenite to alkali-granite and are called the Grootpenseiland and Marinkas Kwela Complexes (GPC and MKC). The Marinkas Kwela Carbonatite Complex is the third and most northerly of the complexes. Isotopic age determinations on a number of rock types from both the silicate complexes yield ages around 520Ma and are consistent with published Pan-African ages for the Province. Each silicate complex shows a migrating locus of intrusion from Siundersaturated rocks in the southwest to Si-oversaturated rocks in the northeast. The complexes overlap in outcrop. The rocks are moderately to highly felsiC and none reflects primary magma compositions. The Si-undersaturated rocks from both complexes include side-wall cumulates formed from magmas that fractionated alkali-feldspar, clinopyroxene and amphibole. Foyaites also occur in the MKC and have a compositional range reflecting alkali-feldspar fractionation and, probably, some interaction with dolomite country rocks. Major and trace element data suggest that critically saturated alkali syenites occurring in both complexes evolved via protracted feldspar fractionation, and that critically saturated alkali-feldspar syenite occurring only in the GPC is a cumulate. The two rock types cannot be related genetically. Of the SI-oversaturated rocks in both complexes, those in the compositional range monzonite to granite were intruded before alkali-granites. Compositional diversity amongst the former reflects fractionation of feldspar and of mafic phases, but that process cannot genetically link the rocks to the alkali-granites. Isotopic compositions of Sr and Nd indicate that the silicate magmas were derived from an upper mantle source region characterised by low time-integrated Rb/Sr ratios and high time-Integrated Sm/Nd ratios, However, the evidence of Sr and 0 isotopic data is that the Si-oversaturated melts possibly interacted with a crustal component. presumably the Proterowlc rocks of the Namaqua Metamorphic Province. This interaction may explain the occurrence of apparently co-genetic rock series that evolved on opposite sides of the feldspar join in Petrogeny's Residua System. The Marinkas Kwela Carbonatite Complex was emplaced before the final intrusive phases of the MKC and exhibits unusually pronounced late-stage enrichment in manganese. The earliest intrusive rocks in the complex were nepheline syenites which were fenitised by later intrusions of sôvites. Although the commonly occurring magmatic sequence of sôvite-beforsite-ferrocarbonatite is observed at Marinkas Kwela, sôvites do not appear to have been parental to beforsites. Removal of apatite and early crystallisation of magnetite distinguish magnetite-rich beforsite from co-genetic apatite-rich beforsite. Two further magmatic sequences. the first from apatite-rich beforsite through ferrocarbonatite to Mn-rich ferrocarbonatite (high Fe/Mn) and the second from magnetite-rich beforsite to Mn-rich ferrocarbonatite (low Fe/Mn). reflect fractionation of dolomite and of dolomite+magnetite respectively.
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Lum, Clinton Chew Lun. "Aspects of the petrogenesis of alkali basalts from the Lunar Crater volcanic field, Nevada." Connect to resource, 1986. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1230660431.

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Pattie, Andrew J. D. "Hybridization of basic wall rocks in xenolithic igneous complexes." Thesis, Aston University, 1989. http://publications.aston.ac.uk/14371/.

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Chan, Heung-ngai. "Igneous and metamorphic rocks from SW Cyprus and NW Syria evidence for Cretaceous microplate collision and subsequent tectonic events in the Eastern Mediterranean /." Click to view the E-thesis via HKUTO, 2004. http://sunzi.lib.hku.hk/hkuto/record/B30711940.

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Riter, Joyce Christine Alexis. "Geochemical and tectonic evolution of the Colorado Plateau mantle lithosphere : evidence from Grand Canyon mantle xenoliths /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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Books on the topic "Alkalic igneous rocks Geology"

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Sage, R. P. Geology of carbonatite-alkalic rock complexes in Ontario: Argor Carbonatite Complex, district of Cochrane. Toronto, Ont: Ministry of Northern Development and Mines, Mines and Minerals Division, 1988.

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Sage, R. P. Geology of carbonatite-alkalic rock complexes in Ontario: Goldray Carbonatite Complex, district of Cochrane. Toronto, Ont: Ministry of Northern Development and Mines, Mines and Minerals Division, 1988.

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Sage, R. P. Geology of carbonatite-alkalic rock complexes in Ontario: Cargill Township Carbonatite Complex, district of Cochrane. Toronto, Ont: Ontario Ministry of Northern Development and Mines, Mines and Minerals Division, 1988.

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Sage, R. P. Geology of carbonatite-alkalic rock complexes in Ontario: "Carb" Lake Carbonatite Complex, district of Kenora. Toronto, Ont: Ministry of Northern Development and Mines, 1987.

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Sage, R. P. Geology of carbonatite-alkalic rock complexes in Ontario: Borden Township carbonatite complex, district of Sudbury. Toronto, Ont: Ontario Ministry of Northern Development and Mines, 1987.

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6

Sage, R. P. Geology of carbonatite-alkalic rock complexes in Ontario: Valentine Township Carbonatite Complex, district of Cochrane. Toronto, Ont: Ministry of Northern Development and Mines, Mines and Minerals Division, 1988.

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7

Sage, R. P. Geology of carbonatite-alkalic rock complexes in Ontario: Schryburt Lake Carbonatite Complex, district of Kenora. Toronto, Ont: Ontario, Ministry of Northern Development and Mines, Mines and Minerals Division, 1988.

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8

Sage, R. P. Geology of carbonatite-alkalic rock complexes in Ontario: Seabrook Lake Carbonatite Complex, district of Algoma. Toronto, Ont: Ministry of Northern Development and Mines, Mines and Minerals Division, 1988.

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Sage, R. P. Geology of carbonatite-alkalic rock complexes in Ontario: Spanish River Carbonatite Complex, district of Sudbury. Toronto, Ont: Ministry of Northern Development and Mines, 1987.

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Sage, R. P. Geology of carbonatite-alkalic rock complexes in Ontario: Firesand River Carbonatite Complex, district of Algoma. Toronto, Ont: Ontario Ministry of Northern Development and Mines, Mines and Minerals Division, 1988.

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Book chapters on the topic "Alkalic igneous rocks Geology"

1

Karner, Frank R., Gordon A. Jenner, Stanley F. White, and Don L. Halvorson. "Field guide day 7: Geology of the Bear Lodge Mountains." In Devils Tower—Black Hills Alkalic Igneous Rocks and General Geology, 83–88. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/ft131p0083.

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Karner, Frank R. "Field guide day 1: Geology of the precambrian rocks of the Keystone region." In Devils Tower—Black Hills Alkalic Igneous Rocks and General Geology, 29–32. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/ft131p0029.

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Karner, Frank R., and Don L. Halvorson. "Field guide day 6: Geology of the Devils Tower and Missouri Buttes region." In Devils Tower—Black Hills Alkalic Igneous Rocks and General Geology, 70–74. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/ft131p0070.

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Karner, Frank R. "IGC Field Trip T131: Devils Tower—Black Hills alkalic igneous rocks and general geology." In Devils Tower—Black Hills Alkalic Igneous Rocks and General Geology, 1–2. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/ft131p0001.

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Karner, Frank R., and Richard L. Patelke. "IGC Field Trip T131: General geology of the Black Hills and Bear Lodge Mountains." In Devils Tower—Black Hills Alkalic Igneous Rocks and General Geology, 7–20. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/ft131p0007.

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Karner, Frank R. "IGC Field Trip T131: Geological framework of the Black Hills—Bear Lodge Mountains region." In Devils Tower—Black Hills Alkalic Igneous Rocks and General Geology, 3–6. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/ft131p0003.

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Karner, Frank R., Gloria A. Pederson, and Marilyn R. Shultz. "Glossary of places and people of the Black Hills." In Devils Tower—Black Hills Alkalic Igneous Rocks and General Geology, 21–28. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/ft131p0021.

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Karner, Frank R., and Richard L. Patelke. "Field guide day 2: Geology of the precambrian rocks of the Custer region, Hot Springs Mammoth site and Wind Cave." In Devils Tower—Black Hills Alkalic Igneous Rocks and General Geology, 33–40. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/ft131p0033.

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Karner, Frank R., and Stanley F. White. "Field guide day 3: Geology of the Badlands region and the mesozoic-paleozoic rocks of Boulder Canyon." In Devils Tower—Black Hills Alkalic Igneous Rocks and General Geology, 41–44. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/ft131p0041.

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Karner, Frank R. "Activities guide day 4: United States Independence Day and geological and cultural features of the Deadwood region." In Devils Tower—Black Hills Alkalic Igneous Rocks and General Geology, 45. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/ft131p0045.

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Conference papers on the topic "Alkalic igneous rocks Geology"

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Anderson, Eric D., Karen D. Kelley, Erin E. Marsh, and Wesley R. Weisberg. "THE USE OF POTENTIAL FIELD DATA IN CHARACTERIZING BASEMENT ROCKS AND IGNEOUS SUITES NEAR THE TELLURIUM-RICH CRIPPLE CREEK ALKALIC EPITHERMAL DEPOSIT, COLORADO." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-286629.

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Elobaid, Elnaiem Ali, Fadhil Sadooni, and Hamad Al Saad. "Tectonic and Geologic Settings of Halul and Al-Alyia Offshore Islands, Examples of Different Evolution Models, Within the Emergence of the Arabian Gulf Geosyncline: A Review." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0044.

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Abstract:
The Arabian Gulf represents a significant water body and strategic pathway, which has pronounced regional and international benefits. This research investigated the evolution of the Arabian Gulf geosyncline. Furthermore, it explored the formation, geologic and tectonic settings of Halul and Al-Alyia offshore Islands, as examples of two different evolution models, within the emergence framework. The Arabian Gulf geosyncline has been emerged during the Cenozoic Era (Late Miocene-Pliocene Epoch), situated in the northeastern collisional marginal part of the Arabian Plate, as a foredeep geosyncline or basin, squeezed or crammed between the stable Arabian Plate and the mobile Euro-Asian Plate, along the subduction zone, within Zagros Mountain Fold Thrust Belt. Halul Island is situated to the northeast of the Greater Doha City and has great national economic value. It has a unique shape, elongated domal structure, oriented from South-West to North-East. The tectonic setting of Halul Island is classified as salt diapirism. The surface geology of this Island is dominated by carbonate rocks, mainly limestone and dolomitic limestone, and some igneous rock, such as basalt and Tholeiite. Al-Alyia Island is an integral part of the mainland. It is situated within the Greater Doha City's vicinity, in the eastern coastal zone. The Island is oriented from south-east to north-west. It is characterized by a gentle slope and low relief topography. The main rocks forming the island is the limestone and dolomitic limestone of the Simsima /Umm Bab Member of the Upper Dammam Formation of Tertiary age. This fact suggests that the island has a similar geologic setting to the mainland. This study revealed that the Halul Island evolution model is completely different from the evolution model of Al-Alyia Island, as Halul Island is a typical example model of salt dome Island, and remnants of the infracambrian salt basin, while Al-Alyia Island represents a different sedimentation model. This research has been carried out as part of the Environmental Science Center (ESC), Qatar University research agenda.
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Reports on the topic "Alkalic igneous rocks Geology"

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Jansa, L. F., and G. Pe-Piper. Geology and Geochemistry of Middle Jurassic and Early Cretaceous Igneous Rocks On the eastern North American Continental Shelf. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/130140.

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Herriott, T. M., M. A. Wartes, R. J. Newberry, W. K. Wallace, and R. J. Gillis. Geology, geochemistry, and regional implications of mafic igneous rocks in the Carboniferous Lisburne Group, Ivishak River area, northeastern Brooks Range, Alaska (poster): The Sixth International Conference on Arctic Margins, 31 May-2 June 2011, Fairbanks, Alaska. Alaska Division of Geological & Geophysical Surveys, May 2011. http://dx.doi.org/10.14509/29562.

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Tweet, Justin S., Vincent L. Santucci, Kenneth Convery, Jonathan Hoffman, and Laura Kirn. Channel Islands National Park: Paleontological resource inventory (public version). National Park Service, September 2020. http://dx.doi.org/10.36967/nrr-2278664.

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Channel Island National Park (CHIS), incorporating five islands off the coast of southern California (Anacapa Island, San Miguel Island, Santa Barbara Island, Santa Cruz Island, and Santa Rosa Island), has an outstanding paleontological record. The park has significant fossils dating from the Late Cretaceous to the Holocene, representing organisms of the sea, the land, and the air. Highlights include: the famous pygmy mammoths that inhabited the conjoined northern islands during the late Pleistocene; the best fossil avifauna of any National Park Service (NPS) unit; intertwined paleontological and cultural records extending into the latest Pleistocene, including Arlington Man, the oldest well-dated human known from North America; calichified “fossil forests”; records of Miocene desmostylians and sirenians, unusual sea mammals; abundant Pleistocene mollusks illustrating changes in sea level and ocean temperature; one of the most thoroughly studied records of microfossils in the NPS; and type specimens for 23 fossil taxa. Paleontological research on the islands of CHIS began in the second half of the 19th century. The first discovery of a mammoth specimen was reported in 1873. Research can be divided into four periods: 1) the few early reports from the 19th century; 2) a sustained burst of activity in the 1920s and 1930s; 3) a second burst from the 1950s into the 1970s; and 4) the modern period of activity, symbolically opened with the 1994 discovery of a nearly complete pygmy mammoth skeleton on Santa Rosa Island. The work associated with this paleontological resource inventory may be considered the beginning of a fifth period. Fossils were specifically mentioned in the 1938 proclamation establishing what was then Channel Islands National Monument, making CHIS one of 18 NPS areas for which paleontological resources are referenced in the enabling legislation. Each of the five islands of CHIS has distinct paleontological and geological records, each has some kind of fossil resources, and almost all of the sedimentary formations on the islands are fossiliferous within CHIS. Anacapa Island and Santa Barbara Island, the two smallest islands, are primarily composed of Miocene volcanic rocks interfingered with small quantities of sedimentary rock and covered with a veneer of Quaternary sediments. Santa Barbara stands apart from Anacapa because it was never part of Santarosae, the landmass that existed at times in the Pleistocene when sea level was low enough that the four northern islands were connected. San Miguel Island, Santa Cruz Island, and Santa Rosa Island have more complex geologic histories. Of these three islands, San Miguel Island has relatively simple geologic structure and few formations. Santa Cruz Island has the most varied geology of the islands, as well as the longest rock record exposed at the surface, beginning with Jurassic metamorphic and intrusive igneous rocks. The Channel Islands have been uplifted and faulted in a complex 20-million-year-long geologic episode tied to the collision of the North American and Pacific Places, the initiation of the San Andreas fault system, and the 90° clockwise rotation of the Transverse Ranges, of which the northern Channel Islands are the westernmost part. Widespread volcanic activity from about 19 to 14 million years ago is evidenced by the igneous rocks found on each island.
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