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Journal articles on the topic 'Aplite'

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Published: 4 June 2021

Last updated: 30 January 2023

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1

Antunes, Isabel Margarida Horta Ribeiro, Ana Margarida Ribeiro Neiva, João Manuel Farinha Ramos, Paulo Bravo Silva, Maria Manuela Vinha Guerreiro Silva, and Fernando Corfu. "Petrogenetic links between lepidolite-subtype aplite-pegmatite, aplite veins and associated granites at Segura (central Portugal)." Geochemistry 73, no. 3 (October 2013): 323–41. http://dx.doi.org/10.1016/j.chemer.2012.12.003.

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2

Neiva, A. M. R. "Distribution of trace elements in feldspars of granitic aplites and pegmatites from Alijó-Sanfins, northern Portugal." Mineralogical Magazine 59, no. 394 (March 1995): 35–45. http://dx.doi.org/10.1180/minmag.1995.59.394.04.

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AbstractAt Alijó-Sanfins there are many granitic aplite and pegmatite veins crosscutting different petrographic facies of the Hercynian granite batholith and also mica-schists. They are tin-bearing granitic rocks. Thirty-four samples of K-feldspar and 34 of albite from these veins and host granites were analysed to establish the distribution of elements and their fractionation trends in the sequence of feldspar crystallization. Rubidium and Cs increase, and Ba, Sr, Ba/K, Sr/K and K/Rb decrease in K-feldspar, whereas Na increases and Sr and Ca decrease in albite, from granites to aplites and pegmatites. In a few aplite-pegmatite veins Rb, Rb/Ba and Rb/Sr increase and Ba, Sr, K/Rb and Ba/Sr decrease in K-feldspar, and Rb increases and Sr decreases in albite from aplite to coexisting pegmatite. Equilibrium was not attained for trace elements between coexisting feldspars.

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3

Drysdale, D. J. "Petalite and spodumene in the Meldon Aplite, Devon." Mineralogical Magazine 49, no. 354 (December 1985): 758–59. http://dx.doi.org/10.1180/minmag.1985.049.354.20.

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4

Beal, Kristy-Lee, David R. Lentz, Douglas C. Hall, and Gregory Dunning. "Mineralogical, geochronological, and geochemical characterization of Early Devonian aquamarine-bearing dykes of the Zealand Station beryl and molybdenite deposit, west central New Brunswick." Canadian Journal of Earth Sciences 47, no. 6 (June 2010): 859–74. http://dx.doi.org/10.1139/e10-014.

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The Zealand Station beryl (aquamarine) and molybdenite deposit is located 25 km northwest of Fredericton, New Brunswick, along the northeastern cusp of the Hawkshaw Granite, previously dated at 411 ± 1 Ma (U–Pb titanite), of the multiphase Devonian Pokiok Batholith. A late-stage, southeast-trending, pegmatite–aplite dyke has abundant aquamarine associated with pegmatitic sections. An exposure of a pegmatitic dyke is predominantly quartz and K-feldspar that exhibits a border, intermediate, and core zone. The main pegmatite–aplite dyke has been dated at 400.5 ± 1.2 Ma using U–Pb thermal ionization mass spectrometry on magmatic zircon. This is consistent with the 404 ± 8 Ma age using the chemical U–Th – total Pb isochron method from the pegmatitic beryl-rich section. These ages link these pegmatitic to aplitic dykes to the Allandale Granite, which is the youngest (402 ± 1 Ma by U–Pb on monazite) and most evolved phase of the Pokiok Batholith. The granitic aplite and pegmatite dyke samples are predominantly magnesian with one pegmatite sample being ferroan (FeOt/(FeOt +MgO) = 0.64–0.94); the samples are slightly potassic and calc-alkaline with strong peraluminosity (A/CNK = 1.23–4.76). The various phases of dykes were derived from magma with crustal A-type source characteristics similar to the Allandale Granite. The Sm–Nd isotope values for the aplite dyke (εNd(400) = –2.15) and the Allandale Granite (εNd(400) = –1.6) reflect some assimilation of metasediments relative to other phases of the Pokiok Batholith. The pegmatite and aplite dykes are high-level, rare-earth element pegmatite phases (Nb–Y–F-type) with some Li–Cs–Ta-type characteristics.

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5

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.

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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.

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6

Bogoch, R., J. Bourne, M. Shirav, and L. Harnois. "Petrochemistry of a Late Precambrian garnetiferous granite, pegmatite and aplite, southern Israel." Mineralogical Magazine 61, no. 404 (February 1997): 111–22. http://dx.doi.org/10.1180/minmag.1997.061.404.11.

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AbstractGarnet is a widespread minor accessory mineral in the Late Proterozoic Elat-Quarry granite of southern Israel and is more abundant in the associated pegmatite and aplite. All garnets are dominated by almandine and spessartine end-members. Granite-hosted garnets are zoned with relative enrichment of Mn in the core and Fe in the rim. The chemistry of the garnet in the pegmatite and aplite are comparable to the rim compositions of garnets in the granite, but with a slight Fe-depletion at the rims. Geochemical parameters for the granite indicate fractional crystallization largely of an S-type source magma to a peraluminous composition.In the highly evolved granite magma, Fe is relatively diminished, and only small amounts of biotite can crystallize. Manganese becomes a compatible element forming Mn-rich garnet (cores), and reducing the Mn content in the magma, subsequently leading to Fe-enriched rims. The greater abundance of garnet in the pegmatite and aplite (and its larger crystal-size in the former) relate to the enhanced presence of a hydrous fluid within the magma. The tendency for garnet crystals to concentrate in bands is much more developed in the pegmatite than in the granite, and is associated with the effects of hydrofracturing (fracture-filling), and the crystallization of coarse-grained alkaline feldspars.

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7

Persico, Lyman P., Leslie D. McFadden, Jedidiah D. Frechette, and Grant A. Meyer. "Rock type and dust influx control accretionary soil development on hillslopes in the Sandia Mountains, New Mexico, USA." Quaternary Research 76, no. 3 (November 2011): 411–16. http://dx.doi.org/10.1016/j.yqres.2011.08.005.

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AbstractLower slopes of the Sandia Mountains are characterized by granitic corestone topography and weathering-limited slopes with thin grusy colluvium and weakly developed soils. In contrast, thick soils with illuvial clay and pedogenic carbonate have developed below aplite outcrops. Aplite is resistant to chemical decomposition, but physically weathers to blocky clasts that enhance surface roughness and erosional resistance of colluvium, promoting accumulation of eolian fines. Thick B horizons on aplite slopes indicate limited erosion and prolonged periods of stability and soil development. Accretion of eolian material limits runoff and prevents attainment of a steady-state balance between soil production and downslope transport.

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8

Garate-Olave, Idoia, Encarnación Roda-Robles, Pedro Pablo Gil-Crespo, Alfonso Pesquera, and Jon Errandonea-Martin. "The Tres Arroyos Granitic Aplite-Pegmatite Field (Central Iberian Zone, Spain): Petrogenetic Constraints from Evolution of Nb-Ta-Sn Oxides, Whole-Rock Geochemistry and U-Pb Geochronology." Minerals 10, no. 11 (November 12, 2020): 1008. http://dx.doi.org/10.3390/min10111008.

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Abundant Li-Cs-Ta aplite-pegmatite dykes were emplaced in the western Central Iberian Zone of the Iberian Massif during the Variscan Orogeny. Their origin and petrogenetic relationships with the widespread granitoids have led to a currently rekindled discussion about anatectic vs. granitic origin for the pegmatitic melts. To deal with these issues, the aplite-pegmatite dykes from the Tres Arroyos area, which constitute a zoned pegmatitic field related to the Nisa-Alburquerque granitic batholith, have been studied. This work comprises a complete study of Nb-Ta-Sn oxides’ mineralogy, whole-rock geochemistry, and U-Pb geochronology of the aplite-pegmatites that have been grouped as barren, intermediate, and Li-rich. The most abundant Nb-Ta-Sn oxides from Tres Arroyos correspond to columbite-(Fe), columbite-(Mn) and cassiterite. Niobium-Ta oxides show a marked increase in the Mn/(Mn+Fe) ratio from the barren aplite-pegmatites up to the Li-rich bodies, whereas variations in the Ta/(Ta+Nb) ratio are not continuous. The probable factors controlling fractionation of Mn/Fe and Ta/Nb reflected in Nb-Ta oxides may be attributed to the crystallization of tourmaline, phosphates and micas. The lack of a progressive Ta/Nb increase with the fractionation may be also influenced by the high F and P availability in the parental pegmatitic melts. Most of the primary Nb-Ta oxides would have crystallized by punctual chemical variations in the boundary layer, whereas cassiterite formation would be related to an undercooling of the system. Whole-rock composition of the distinguished lithotypes reflects similar tendencies to those observed in mineral chemistry, supporting a single path of fractional crystallization from the parental Nisa-Alburquerque monzogranite up to the most evolved Li-rich aplite-pegmatites. The age of 305 ± 9 Ma, determined by LA-ICP-MS U-Pb dating of columbite-tantalite oxides, reinforces the linkage of the studied aplite-pegmatites and the cited parental monzogranite.

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9

Morton, Douglas M., J. Blue Sheppard, Fred K. Miller, and Cin-Ty A. Lee. "Petrogenesis of the cogenetic Stewart pegmatite-aplite, Pala, California: Regional implications." Lithosphere 11, no. 1 (December 20, 2018): 91–128. http://dx.doi.org/10.1130/l1026.1.

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10

Dell'Angelo, Lisa N., and Jan Tullis. "Textural and mechanical evolution with progressive strain in experimentally deformed aplite." Tectonophysics 256, no. 1-4 (May 1996): 57–82. http://dx.doi.org/10.1016/0040-1951(95)00166-2.

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11

Marques, R., A. Jorge, D. Franco, M. I. Dias, and M. I. Prudêncio. "Clay resources in the Nelas region (Beira Alta), Portugal. A contribution to the characterization of potential raw materials for prehistoric ceramic production." Clay Minerals 45, no. 3 (September 2010): 353–70. http://dx.doi.org/10.1180/claymin.2010.045.3.353.

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AbstractMineralogical and chemical compositions of residual and sedimentary clays (bulk and <2 μm fraction) from the Nelas region (schist, aplite-pegmatites, granites and Tertiary sediments from both Mondego River margins), Portugal, were studied, aiming to establish indicators for raw materials in ancient ceramic provenance studies. The mineralogy of bulk material does not provide a clear distinction between samples. Among clay minerals, kaolinite dominates, except in the aplite-pegmatites where illite prevails. Smectite was only found in sediments of the left river bank.A more successful result was the geochemical differentiation of clay types. The weathered schist presents greater enrichment in Cr, whereas the clay fraction of aplite-pegmatites shows enrichment in all the chemical elements studied. The sediments and weathered granites are not easy to differentiate; the best geochemical indicators are U (lower contents in clay-size fraction of sediments) and REE patterns in both bulk and clay-size fraction.

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12

Khalifeh, Mahmoud, Arild Saasen, Torbjørn Vrålstad, Helge Bøvik Larsen, and Helge Hodne. "Experimental study on the synthesis and characterization of aplite rock-based geopolymers." Journal of Sustainable Cement-Based Materials 5, no. 4 (June 10, 2015): 233–46. http://dx.doi.org/10.1080/21650373.2015.1044049.

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13

Hackett, Damien. "Mineralized aplite—pegmatite at Jabal Sa'id, Hijaz region, Kingdom of Saudi Arabia." Journal of African Earth Sciences (1983) 4 (January 1986): 257–67. http://dx.doi.org/10.1016/s0899-5362(86)80087-2.

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14

Morgan VI, George B., and David London. "Crystallization of the Little Three layered pegmatite-aplite dike, Ramona District, California." Contributions to Mineralogy and Petrology 136, no. 4 (September 15, 1999): 310–30. http://dx.doi.org/10.1007/s004100050541.

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15

Thủy, Nguyễn Thị, Nguyễn Thị Lệ Huyền, Nguyễn Thị Ngọc Trâm, and Lê Hải Nghĩa. "Mineral compositions of magmatic dikes cutting across the Khe Phen granites (Huong Tra, Thua Thien Hue, Central Vietnam)." Hue University Journal of Science: Natural Science 128, no. 1B (June 7, 2019): 21. http://dx.doi.org/10.26459/hueuni-jns.v128i1b.5280.

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The Khe Phen granite quarry located in Huong Tra district (Thua Thien Hue province) has been confirmed as a part of the Ba Na granitoid complex (G/K<sub>2</sub><em>bn</em>), mostly composed of two-mica granite and porphyritic granite. Field survey data show that the granites here are cut across by five distinct narrow dikes (about 50-70 cm wide) including granite pegmatite, granite aplite, aplite, granodiorite and lamprophyre diorite. Mineral compositions of the granite pegmatite and aplite dikes are similar with those of the host granite, which are mainly comprised of quartz (27-35 %), orthoclase (45-58 %), plagioclase (4-15 %), biotite (1-3 %) and a few opaque minerals. Meanwhile, the granodiorite and lamprophyre diorite dikes are melanocratic and compositionally much more mafic, particularly lamprophyre diorite, evidenced by a presence of hornblende (50-55 %), plagioclase (33-40 %), quartz (3-15 %), calcite (5-17 %)... Origin and emplacement age of the latter dikes have not been reported so far, and thus are needed for further studies based on geochemical and isotopic data.

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16

Lowenstern, Jacob B., and W. David Sinclair. "Exsolved magmatic fluid and its role in the formation of comb-layered quartz at the Cretaceous Logtung W-Mo deposit, Yukon Territory, Canada." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 87, no. 1-2 (1996): 291–303. http://dx.doi.org/10.1017/s0263593300006696.

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ABSTRACT:Comb-layered quartz is a type of unidirectional solidification texture found at the roofs of shallow silicic intrusions that are often associated spatially with Mo and W mineralisation. The texture consists of multiple layers of euhedral, prismatic quartz crystals (Type I) that have grown on subplanar aplite substrates. The layers are separated by porphyritic aplite containing equant phenocrysts of quartz (Type II), which resemble quartz typical of volcanic rocks and porphyry intrusions. At Logtung, Type I quartz within comb layers is zoned with respect to a number of trace elements, including Al and K. Concentrations of these elements as well as Mn, Ti, Ge, Rb and H are anomalous and much higher than found in Type II quartz from Logtung or in igneous quartz reported elsewhere. The two populations appear to have formed under different conditions. The Type II quartz phenocrysts almost certainly grew from a high-silica melt between 600 and 800°C (as β-quartz); in contrast, the morphology of Type I quartz is consistent with precipitation from a hydrothermal solution, possibly as α-quartz grown below 600°C. The bulk compositions of comb-layered rocks, as well as the aplite interlayers, are consistent with the hypothesis that these textures did not precipitate solely from a crystallising silicate melt. Instead, Type I quartz may have grown from pockets of exsolved magmatic fluid located between the magma and its crystallised border. The Type II quartz represents pre-existing phenocrysts in the underlying magma; this magma was quenched to aplite during fracturing/degassing events. Renewed and repeated formation and disruption of the pockets of exsolved aqueous fluid accounts for the rhythmic banding of the rocks.

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17

Király, Edit, and Kálmán Török. "Magmatic garnet in deformed aplite dykes from the Mórágy granitoid, SE-Transdanubia, Hungary." Acta Geologica Hungarica 46, no. 3 (December 2003): 239–54. http://dx.doi.org/10.1556/ageol.46.2003.3.1.

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18

Whitworth, Martin P. "Petrogenetic implications of garnets associated with lithium pegmatites from SE Ireland." Mineralogical Magazine 56, no. 382 (March 1992): 75–83. http://dx.doi.org/10.1180/minmag.1992.056.382.10.

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AbstractSpodumene pegmatites, aplites and schists from the Aclare Li prospect of SE Ireland host sporadically developed, small, red, euhedral garnets. Chemical data indicate that the pegmatite- and aplite-hosted garnets are rich in spessartine and are similar to garnets in many African Li-rich pegmatites. Partial melting as a source of the garnets is unlikely due to the large spessartine component, the abundance of inclusions within the garnets and the general P-T-X evolution of the pegmatite body. It is suggested that an aqueous fluid was exsolved during pegmatite crystallisation and complexed available Mn. Movement of this fluid to the intermediate zone of the pegmatite body produced areas of high Mn concentrations which permitted the crystallisation of spessartine-rich garnets at low pressures (<3 kbar).

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19

STEPANYUK, L. M., S. I. KURYLO, O. V. KOVTUN, T. I. DOVBUSH, and O. B. VYSOTSKY. "Uranium-Lead Geochronology of Two-Feldspar Granites of the Inhul Megablock (Ukrainian Shield) by Monazite." Mineralogical journal 43, no. 2 (2021): 49–57. http://dx.doi.org/10.15407/mineraljournal.43.02.049.

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In the area of the Novooleksandrivka village, the valley of the Bokovenka river crosses a powerful strip of metamorphic rocks of the Inhulo-Inhulets series with numerous small granitoid bodies of the Kirovohrad complex. In the right bank of the river valley north of Novooleksandrivka there are almost continuous rock outcrops of porphyry-like, mostly coarse-grained garnet-biotite granites, which are cut by veins of aplite-pegmatoid and pegmatoid granites. Uranium-lead isotope systems of accessory monazites from porphyry-like granite, layered body of uneven-grained granite and from veined body of aplite-pegmatoid granite have been studied. The age of the first two, more coarse-grained granite varieties, is 2043.2 ± 2.6 and 2041 ± 2.3 million years, respectively. Significantly younger are the monocytes from the vein of aplite-pegmatoid granite - 2030 ± 0.3 million years. In granites in this sequence, in addition to structural and textural characteristics (in general, decrease in grain size), there is a decrease in the amount of SiO2 (from 73.14 to 70.93%) connected with a significant increase in K2O (from 3.96 to 7.58%), (their inverse correlation coefficient is 0.98), a significant decrease in the CaO content from 2.04 to 0.97%, and a slight decrease in the MgO content from 1.14% to 0.82%. These changes are probably caused by the crystallizational differentiation of the original granite melt.

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20

Neiva, Ana M. R., and João M. F. Ramos. "Geochemistry of granitic aplite-pegmatite sills and petrogenetic links with granites, Guarda-Belmonte area, central Portugal." European Journal of Mineralogy 22, no. 6 (December 23, 2010): 837–54. http://dx.doi.org/10.1127/0935-1221/2010/0022-2072.

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21

Sakoma, E. M., and R. F. Martin. "Oxidation-induced postmagmatic modifications of primary ilmenite, NYG-related aplite dyke, Tibchi complex, Kalato, Nigeria." Mineralogical Magazine 66, no. 4 (August 2002): 591–604. http://dx.doi.org/10.1180/0026461026640051.

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AbstractWe describe an ilmenite-bearing aplitic syenite dyke in the roof zone of the Tibchi granite, exposed at Kalato, in the Tibchi ring-complex, northern Nigeria. Inclusions of ferrocolumbite, rutile and ixiolite in the ilmenite are inferred to have been trapped at the magmatic stage. The main mafic mineral is annite. Compositionally, the ilmenite, rutile and ferrocolumbite have near-end-member compositions. A positive correlation between Sc and Ta/(Ta+Nb) indicates that Sc behaved incompatibly as ferrocolumbite grew. Such entrapped accessory minerals may well have formed by local saturation at the ilmenite-melt and annite-melt interface. During and after their crystallization, the melt reached saturation in H2O and degassed. A second generation of ilmenite enriched in Mn and Zn replaced the primary ilmenite along fractures and grain margins. AsfO2began to increase, composite blebs and rinds of ‘ferropseudobrookite’, rutile and hematite began to develop by oxidation-induced exsolution in the primary ilmenite. Incorporation of Nb, Ta, Sc and Si in the ‘ferropseudobrookite’ may well have stabilized it at Kalato. Ultimately, it is transformed to hematite + rutile. The IMA-sanctioned view that the solid solution between pseudobrookite and Ti3O5is complete, and thus that ‘ferropseudobrookite’, as an intermediate member of the series, does not merit species status, needs to be re-evaluated.

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22

Al-Shaieb, Zuhair. "Uranium mineralization in the peralkaline Quanah Granite and related pegmatite-aplite dikes, wichita mountains, oklahoma." Ore Geology Reviews 3, no. 1-3 (April 1988): 161–75. http://dx.doi.org/10.1016/0169-1368(88)90016-9.

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23

Webber, Karen L., William B. Simmons, Alexander U. Falster, and Eugene E. Foord. "Cooling rates and crystallization dynamics of shallow level pegmatite-aplite dikes, San Diego County, California." American Mineralogist 84, no. 5-6 (June 1, 1999): 708–17. http://dx.doi.org/10.2138/am-1999-5-602.

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24

Thomas, Rainer, and Paul Davidson. "Hingganite-(Y) from a small aplite vein in granodiorite from Oppach, Lusatian Mts., E-Germany." Mineralogy and Petrology 111, no. 6 (February 7, 2017): 821–26. http://dx.doi.org/10.1007/s00710-016-0489-4.

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25

Sheikhi Gheshlaghi, Rasoul, Mansour Ghorbani, Ali Asghar Sepahi, Reza Deevsalar, and Ryuichi Shinjo. "Petrogenesis of gem sapphire in a pegmatite-aplite vein from the Alvand batholith, Western Iran." Mineralogy and Petrology 114, no. 6 (August 6, 2020): 501–13. http://dx.doi.org/10.1007/s00710-020-00716-w.

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26

Neiva, Ana M. R. Gomes. "Geochemistry of granitic aplite-pegmatite sills and their minerals from Arcozelo da Serra area (Gouveia, central Portugal)." European Journal of Mineralogy 20, no. 4 (August 29, 2008): 465–85. http://dx.doi.org/10.1127/0935-1221/2008/0020-1827.

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27

Harrison, T. N. "Magmatic Garnets in the Cairngorm Granite, Scotland." Mineralogical Magazine 52, no. 368 (December 1988): 659–67. http://dx.doi.org/10.1180/minmag.1988.052.368.10.

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AbstractSmall, euhedral Mn-rich garnets (32–52 mol. % spessartine) from the Cairngorm granite, Eastern Grampian Highlands, Scotland, are considered to be of magmatic origin and have not been derived from the assimilation of metasedimentary material, despite their occurrence largely at the margins of the pluton. Similar garnets also occur in a late cross-cutting aplite sheet. The garnets in the granite crystallized early in the sequence and are thought to have formed in response to the ponding of Mn-rich fluids against the wall of the pluton. This Mn enrichment of the fluid phase continued throughout the evolution of the pluton, resulting in Mn-rich biotites and opaque oxides and the localized crystallization of Mn-rich garnets in aplite. Garnet contains up to 1.67 wt. % Y, but has not played a major role in the geochemical evolution of the Cairngorm granite, which has high SiO2 (72–77%) and is enriched in Y and HREE. Chemical analyses of garnets, biotites and rocks are given.

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Marangone, Silvana, Fernando G. Sardi, Uwe Altenberger, Kerry Griffin, Clara E. Cisterna, and Anja Schleicher. "Geochemistry of the Villismán granite, associated aplite-pegmatites and surrounding Li-pegmatites, Sierra de Ancasti, Argentina." Journal of South American Earth Sciences 103 (November 2020): 102764. http://dx.doi.org/10.1016/j.jsames.2020.102764.

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29

Dawood, Yehia H., Hesham M. Harbi, and Hamdy H. Abd El-Naby. "Genesis of kasolite associated with aplite-pegmatite at Jabal Sayid, Hijaz region, Kingdom of Saudi Arabia." Journal of Asian Earth Sciences 37, no. 1 (January 2010): 1–9. http://dx.doi.org/10.1016/j.jseaes.2009.05.007.

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30

Sepahi, Ali Asghar, Sedigheh Salami, and Mohammad Maanijou. "The study of petrography and mineral chemistry in aplite-pegmatites from Simin valley (south of Hamedan)." Iranian Journal of Crystallography and Mineralogy 28, no. 1 (March 1, 2020): 37–50. http://dx.doi.org/10.29252/ijcm.28.1.37.

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31

Linnen, Robert L., and Anthony E. Williams-Jones. "Mineralogical constraints on magmatic and hydrothermal Sn-W-Ta-Nb mineralization at the Nong Sua aplite-pegmatite, Thailand." European Journal of Mineralogy 5, no. 4 (July 22, 1993): 721–36. http://dx.doi.org/10.1127/ejm/5/4/0721.

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32

Neiva, Ana M. R., Carlos L. Gomes, and Paulo B. Silva. "Two generations of zoned crystals of columbite-group minerals from granitic aplite–pegmatite in the Gouveia area, central Portugal." European Journal of Mineralogy 27, no. 6 (December 14, 2015): 771–82. http://dx.doi.org/10.1127/ejm/2015/0027-2473.

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33

Cardoso-Fernandes, Joana, João Silva, Filipa Dias, Alexandre Lima, Ana C. Teodoro, Odile Barrès, Jean Cauzid, Mônica Perrotta, Encarnación Roda-Robles, and Maria Anjos Ribeiro. "Tools for Remote Exploration: A Lithium (Li) Dedicated Spectral Library of the Fregeneda–Almendra Aplite–Pegmatite Field." Data 6, no. 3 (March 16, 2021): 33. http://dx.doi.org/10.3390/data6030033.

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The existence of diagnostic features in the visible and infrared regions makes it possible to use reflectance spectra not only to identify mineral assemblages but also for calibration and classification of satellite images, considering lithological and/or mineral mapping. For this purpose, a consistent spectral library with the target spectra of minerals and rocks is needed. Currently, there is big market pressure for raw materials including lithium (Li) that has driven new satellite image applications for Li exploration. However, there are no reference spectra for petalite (a Li mineral) in large, open spectral datasets. In this work, a spectral library was built exclusively dedicated to Li minerals and Li pegmatite exploration through satellite remote sensing. The database includes field and laboratory spectra collected in the Fregeneda–Almendra region (Spain–Portugal) from (i) distinct Li minerals (spodumene, petalite, lepidolite); (ii) several Li pegmatites and other outcropping lithologies to allow satellite-based lithological mapping; (iii) areas previously misclassified as Li pegmatites using machine learning algorithms to allow comparisons between these regions and the target areas. Ancillary data include (i) sample location and coordinates, (ii) sample conditions, (iii) sample color, (iv) type of face measured, (v) equipment used, and for the laboratory spectra, (vi) sample photographs, (vii) continuum removed spectra files, and (viii) statistics on the main absorption features automatically extracted. The potential future uses of this spectral library are reinforced by its major advantages: (i) data is provided in a universal file format; (ii) it allows users to compare field and laboratory spectra; (iii) a large number of complementary data allow the comparison of shape, asymmetry, and depth of the absorption features of the distinct Li minerals.

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34

Ondrejka, Martin, Peter Bačík, Marián Putiš, Pavel Uher, Tomáš Mikuš, Jarmila Luptáková, Štefan Ferenc, and Alexander Smirnov. "Carbonate-bearing phosphohedyphane–“Hydroxylphosphohedyphane” and cerussite: Supergene products of galena alteration in Permian aplite (Western Carpathians, Slovakia)." Canadian Mineralogist 58, no. 3 (May 1, 2020): 347–65. http://dx.doi.org/10.3749/canmin.1900082.

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ABSTRACT A unique assemblage of hedyphane-group minerals of the apatite supergroup associated with galena, cerussite, and calcite occurs in a Permian aplite dike crosscutting orthogneisses belonging to the pre-Alpine basement of the Veĺký Zelený Potok Valley in the Veporic Unit, Western Carpathians, Central Slovakia. The secondary Ca-Pb phosphates include phosphohedyphane Ca2Pb3(PO4)3Cl and (OH)-dominant “hydroxylphosphohedyphane” Ca2Pb3(PO4)3OH. Detailed EPMA and Raman spectroscopy of the hedyphane-group minerals reveal the presence of Pb, Ca, P, and Cl as major constituents; the systematic presence of (CO3)2– (up to 2.6 wt.% CO2calc; 0.65 apfu C) substituting for (PO4)3– (B-type) is the first reported carbonate-bearing phosphohedyphane in nature. There is also significant localized halogen deficiency (0.38–0.49 apfu Cl+F) which suggests the potential for a new mineral, “hydroxylphosphohedyphane”. The secondary assemblage described herein results from very low-temperature sulfide-carbonate reactions and further near-surface supergene alteration of primary magmatic or metamorphic phosphate minerals (mainly apatite) and hydrothermal galena in the alkaline CO2-rich groundwater.

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35

Dill, Harald G., Reiner Dohrmann, Stephan Kaufhold, and Sorin-Ionut Balaban. "Kaolinization — a tool to unravel the formation and unroofing of the Pleystein pegmatite–aplite system (SE Germany)." Ore Geology Reviews 69 (September 2015): 33–56. http://dx.doi.org/10.1016/j.oregeorev.2015.01.016.

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36

Neiva, Ana M. R., Paulo B. Silva, and João M. F. Ramos. "Geochemistry of granitic aplite-pegmatite veins and sills and their minerals from the Sabugal area, central Portugal." Neues Jahrbuch für Mineralogie - Abhandlungen 189, no. 1 (February 1, 2012): 49–74. http://dx.doi.org/10.1127/0077-7757/2011/0209.

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37

Foord, Eugene E. "Clinobisvanite, eulytite, and namibite from the pala pegmatite district, San Diego Co., California, USA." Mineralogical Magazine 60, no. 399 (April 1996): 387–88. http://dx.doi.org/10.1180/minmag.1996.060.399.14.

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The 100 Ma complex LCT-type composite pegmatite- aplite dykes, intruded into various units of the Southern California Batholith, are known to contain bismuth minerals. Jahns and Wright (1951) reported the following primary and secondary bismuth minerals from the quartz-rich cores of a number of dykes in the Pala district, San Diego Co., California: native bismuth, bismuthinite, bismite, bismutite, and beyerite.

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38

Dill, H. G., B. Weber, A. Gerdes, and F. Melcher. "The Fe-Mn phosphate aplite ‘Silbergrube’ near Waidhaus, Germany: epithermal phosphate mineralization in the Hagendorf-Pleystein pegmatite province." Mineralogical Magazine 72, no. 5 (October 2008): 1119–44. http://dx.doi.org/10.1180/minmag.2008.072.5.1119.

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AbstractThe Silbergrube Aplite (SA) in the Hagendorf-Pleystein Pegmatite District, near Waidhaus, Germany, is a mildly peraluminous NW-SE directed leucogranite dyke. It occurs in association with quartz dykes and aplitic metamorphic mobilizates in the NE Bavarian crystalline basement. The SA differs from other aplitic mobilizates in the region in having a less well developed strain-related mineral orientation and in containing only minor amounts of garnet and tourmaline. The aplitic metamorphic mobilizates and the SA are chemically and mmeralogically almost identical and yield the same age of formation of ∼302 Ma (stage I). The age of formation of the Hagendorf pegmatites seemingly post-dates the emplacement of the SA. The SA was emplaced at the boundary between fine-grained biotite granites and metamorphic country rocks within a zone of structural weakness, favouring the formation of disseminated late magmatic to hydrothermal mineralization of Li-bearing Fe-Mn phosphates (stages II and III). Brittle deformation along this zone was conducive to the faultbound Fe-Mn-Ca phosphates. Mineral telescoping is evident from the presence of Fe2+, Fe3+and Mn2+phosphates in fissures and vugs in a texturally highly variable host-rock environment (stage IV). This intimate intergrowth of phosphate minerals reflects contrasting physical and chemical conditions prevailing in a near-surface/ shallow epithermal S-deficient phosphate system (stage IV), similar to what is known from Cu-Au epithermal systems. The most recent mineral assemblages that formed under predominantly oxidizing conditions are correlated with the subtropical weathering during the Neogene which resulted in the formation of a peneplain truncating the SA and its country rocks (stage V). The SA is the root zone of the felsic aplitic-pegmatitic mobilizates in this region and is overprinted by an epithermal phosphate system.

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39

Charoy, B., F. Noronha, and A. Lima. "SPODUMENE PETALITE EUCRYPTITE: MUTUAL RELATIONSHIPS AND PATTERN OF ALTERATION IN Li-RICH APLITE PEGMATITE DYKES FROM NORTHERN PORTUGAL." Canadian Mineralogist 39, no. 3 (June 1, 2001): 729–46. http://dx.doi.org/10.2113/gscanmin.39.3.729.

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40

SEIDLER, J. K. "Zircon-Rich Ta-Nb-REE Mineralization in the McKeel Lake Pegmatite-Aplite System, Welsford Intrusion, Southwestern New Brunswick." Exploration and Mining Geology 14, no. 1-4 (January 1, 2005): 79–94. http://dx.doi.org/10.2113/gsemg.14.1-4.79.

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41

Cornell, D., A. Moses, T. Cawood, and M. Richter. "New constraints on the age of ore at Black Mountain mine, Bushmanland Ore District, South Africa." South African Journal of Geology 125, no. 3-4 (December 1, 2022): 337–44. http://dx.doi.org/10.25131/sajg.125.0024.

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Abstract The chronostratigraphy of the Bushmanland Ore District and the Namaqua-Natal Province has long been debated, but recent microbeam dating has resolved several issues. An important aspect is the precise age of the sedimentary-exhalative ores and their tectonostratigraphic context. Published constraints on the maximum age of the ores from detrital zircon dating are 1 285 ± 14 Ma (n=4, Gamsberg ore), 1 215 ± 18 Ma (n=6, Wortel Formation) and a tentative 1 118 ± 33 Ma (n=3, Hotson Formation at Black Mountain). The ore is older than the 1 130 ± 35 Ma Koeris Formation metabasalt which unconformably overlies it. Aplite dykes, which intrude the ore of the Black Mountain deposit, provide another potential minimum age constraint on the ore. A sample was dated at 1 175 ± 15 Ma by ion probe U-Pb zircon dating. This shows that the aplite dykes belong to the late-collisional Springputs Suite of granitoids which includes the 1 163 ± 11 Ma Achab and 1 149 ± 15 Ma Hoogoor Gneisses, for which the field relationship with the ores had not been established. The regional M2 metamorphism was recorded in aplite zircon rims at 1 027 ± 9 Ma and at 1 030 ± 6 Ma in monazite and xenotime in the Hotson Formation host rock schists. Detrital zircons, dated by Laser Ablation ICPMS in a host rock schist sample, reflect a dominant Palaeoproterozoic provenance with major age group at 2 003 ± 17 Ma and minor groups at 1 847 and 2 105 Ma. Only 16 analyses were made, which probably accounts for the absence of minor Mesoproterozoic provenance components found in other published datasets. The age of the Black Mountain ore is now constrained between 1 215 ± 18 Ma and 1 175 ± 15 Ma. The tentative 1 118 ± 33 Ma detrital zircon maximum age is shown to be unreliable in view of two younger magmatic rocks with older dates (1 175 and 1 130 Ma). The SEDEX ores thus formed during or just before the ~1 210 Ma assembly of Namaqua terranes and before the ~1 150 Ma syntectonic Springputs Suite granitoid magmatism.

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42

Kawasaki, K., and D. T. A. Symons. "Paleomagnetic dating of magmatic phases at the Cantung tungsten deposit, Northwest Territories, Canada." Canadian Journal of Earth Sciences 51, no. 1 (January 2014): 32–42. http://dx.doi.org/10.1139/cjes-2013-0119.

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The Cantung tungsten–copper (W–Cu) skarn orebodies are hosted by Proterozoic and Lower Cambrian metasedimentary rocks next to the Cretaceous “Mine Stock” monzogranite. Paleomagnetic analyses of 283 specimens from the Open Pit scheelite–chalcopyrite orebody (17 sites) and from adjacent host rocks including the aplite dikes (11 sites) isolated a stable characteristic remanent magnetization (ChRM), mostly by alternating field and then thermal step demagnetization. The step demagnetization results along with rock magnetic analyses of the W concentrate show that the main remanence carriers are single- or pseudosingle-domain pyrrhotite, titanomagnetite, and (or) magnetite. There is no statistically significant difference at 95% confidence between the site mean ChRM directions for the W–Cu ore, the host rock, or the aplite dikes populations. This result indicates that the intrusion of the Mine Stock is coeval with the genesis of the scheelite skarn ore and with dike emplacement to give an overall mean ChRM direction of declination 342.9°, inclination 82.0° (N = 22 sites, radius of cone of 95% confidence α95 = 4.2°, precision parameter k = 54.7) that defines a paleopole at 76.2°N latitude, 212.2°E longitude (radius of cone of 95% confidence A95 = 8.1°). This paleopole is concordant with the coeval 98 Ma North American paleopole at 92% confidence, which provides strong evidence that the eastern Selwyn Basin has been an autochthonous part of North America since the mid-Cretaceous.

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43

Gabr, Mahmoud M. A. "HYDROTHERMAL ZIRCON, NB-TA AND REE MINERALIZATION IN RADIOACTIVE PEGMATITE-APLITE DYKES, NORTH RAS MOHMMED AREA, SOUTH SINAI, EGYPT." Delta Journal of Science 31, no. 1 (June 1, 2007): 84–99. http://dx.doi.org/10.21608/djs.2007.152993.

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44

OGASAWARA, Masatsugu, Yoji SEKI, Satoshi MURAO, Takayosi KODAMA, Katsuhiro TSUKIMURA, and Terumasa NAKAJIMA. "Petrological and geochemical characteristics of aplite found near the Takatori tin-tungsten deposit, Japan and its relationship to mineralization." JOURNAL OF MINERALOGY, PETROLOGY AND ECONOMIC GEOLOGY 88, no. 5 (1993): 239–46. http://dx.doi.org/10.2465/ganko.88.239.

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45

Kontak, D. J., J. Dostal, T. K. Kyser, and D. A. Archibald. "A PETROLOGICAL, GEOCHEMICAL, ISOTOPIC AND FLUID-INCLUSION STUDY OF 370 Ma PEGMATITE-APLITE SHEETS, PEGGYS COVE, NOVA SCOTIA, CANADA." Canadian Mineralogist 40, no. 5 (October 1, 2002): 1249–86. http://dx.doi.org/10.2113/gscanmin.40.5.1249.

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46

Breiter, K., J. Ďurišová, T. Hrstka, Z. Korbelová, M. Vašinová Galiová, A. Müller, B. Simons, R. K. Shail, B. J. Williamson, and J. A. Davies. "The transition from granite to banded aplite-pegmatite sheet complexes: An example from Megiliggar Rocks, Tregonning topaz granite, Cornwall." Lithos 302-303 (March 2018): 370–88. http://dx.doi.org/10.1016/j.lithos.2018.01.010.

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47

Dawood, Yehia H., Hamdy H. Abd El-Naby, and Bassam Ghaleb. "U-series isotopic composition of kasolite associated with aplite-pegmatite at Jabal Sayid, Hijaz region, Kingdom of Saudi Arabia." Arabian Journal of Geosciences 7, no. 7 (May 16, 2013): 2881–92. http://dx.doi.org/10.1007/s12517-013-0963-9.

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48

Neiva, Ana Margarida Ribeiro, Carlos Leal Gomes, Paulo Bravo Silva, Maria Elisa Preto Gomes, and António Carlos Tavares dos Santos. "Geochemistry of granitic aplite-pegmatite dykes and sills and their minerals from the Gravanho-Gouveia area in Central Portugal." Geochemistry 79, no. 2 (May 2019): 221–34. http://dx.doi.org/10.1016/j.geoch.2019.01.001.

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49

Martins, Ivo, António Mateus, Michel Cathelineau, Marie Christine Boiron, Isabel Ribeiro da Costa, Ícaro Dias da Silva, and Miguel Gaspar. "The Lanthanide “Tetrad Effect” as an Exploration Tool for Granite-Related Rare Metal Ore Systems: Examples from the Iberian Variscan Belt." Minerals 12, no. 9 (August 24, 2022): 1067. http://dx.doi.org/10.3390/min12091067.

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Highly fractionated granites and related magmatic-hydrothermal ore-forming processes can be traced by elemental ratios such as Nb/Ta, K/Rb, Y/Ho, Sr/Eu, Eu/Eu*, Zr/Hf, and Rb/Sr. The lanthanide “tetrad effect” parameter (TE1,3) can also be a useful geochemical fingerprint of highly fractionated granites. This work assesses its application as an exploration vector for granite-related mineralization in the Central Iberian Zone by examining TE1,3 variations with different elemental ratios and with the concentrations of rare metals and fluxing elements (such as F, P, and B). The multi-elemental whole-rock characterization of the main Cambrian–Ordovician and Carboniferous–Permian granite plutons and late aplite–pegmatite dykes exposed across the Segura–Panasqueira Sn-W-Li belt show that the increase in TE1,3 values co-vary with magmatic differentiation and metal-enrichment, being the Carboniferous–Permian granite rocks the most differentiated, and metal specialized. The Argemela Li-Sn-bearing rare metal granite and the Segura Li-phosphate-bearing aplite–pegmatite dykes deviate from this geochemical trend, displaying TE1,3 < 1.1, but high P2O5 contents. The results suggest that mineralized rocks related to peraluminous-high-phosphorus Li-Sn granite systems are typified by TE1,3 < 1.1, whereas those associated with peraluminous-high-phosphorus Sn-W-Li (lepidolite) and peraluminous-low-phosphorus Sn-Ta-Nb granite systems display TE1,3 > 1.1, reaching values as high as 1.4 and 2.1, respectively.

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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.

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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.

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