trace elements in feldspar implies that the Evje–Iveland pegmatites formed from progressively more differentiated melts that were emplaced in a southward-propagating system of vertical …
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If these pegmatites formed from crystallization of locally derived anatectic melts or through diffusion processes, the temperature of their formation, at least in the beginning stages, will
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On this basis, the feldspar crystals from Penja (FP) and Manjo pegmatites (FM) were analysed for major and trace elements in order to investigate their main geochemical variations that are ...
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The second stage (Stage II) resulted in the formation of K-feldspar veins and replacement of plagioclase (An 35–57) by K-feldspar (An 0 Ab 1 Or 99) and albite (An 2 Ab 95 Or 3 –An 12 Ab 87 Or 1) in the Act and Hbl schists, and the latter were probably derived from the Cpx schists. Assuming the pressure was the same as the crystallization of ...
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A group of Rb-rich granitic pegmatites near Ziyugou, Danfeng, in the North Qinling Orogen lack typical lithological zoning and have a simple mineralogy dominated by quartz + microcline + albite ...
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Regional metamorphic rocks and most granitic pegmatites (the main exception being pegmatites in the NYF family, e.g., Černý and Ercit 2005) are characteristic of collisional orogeny [e.g., rare ...
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A review of K-feldspar compositions from miarolitic pegmatites shows that in most pegmatites the pocket K-feldspars are enriched in Rb and Cs relative to exopocket K-feldspar within the same body.
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matitic K-feldspar effectively prevent direct laser abla-tion with the relatively narrow laser beam (30–100 m). K-feldspar was sampled from the IZ of granitic pegmatites where biotite, potassic and sodic feldspar, and quartz all are present. This part of the pegmatite formed relatively early ( e.g., Bjørlykke 1935) and, con-An
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Rare-metal (Li, Cs, Ta, Nb)-bearing peralkaline and peraluminous pegmatites represent the world's largest hard rock resource of lithium [1,2].Numerous studies have been carried out on the mineral chemistry of K …
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The geochemistry of K-feldspar for K, P, Sr, Ba, Rb, Cs, Ga, and of muscovite for the same elements plus Nb and Ta, was used for proving the parental relationships of S-type granites and LCT (Li ...
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In this paper, we present a geochemical study of K-feldspars from representative bodies of pegmatites in the Keketuohai pegmatite district in the Altay pegmatite province. Our aim is to …
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A review of K-feldspar compositions from miarolitic pegmatites shows that in most pegmatites the pocket K-feldspars are enriched in Rb and Cs relative to exopocket K-feldspar within the same body. Rayleigh modeling of simultaneous crystallization of K-feldspar from a melt and coexisting aqueous solution predicts that the Cs content of K-feldspar falls to nil, which implies that rare …
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Abstract. K-feldspar in rocks is commonly seen as a heterogeneous mixture of mineral species and varieties with random microstructures. Most consider that observable features arise from incomplete re-equilibrations owing to slow kinetic and localized effects of aqueous fluids (catalyst), with geological environment and chemical impurities playing only a …
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The K-feldspar from strongly zoned gadolinite-type REE–Nb–Ta-rich granitic pegmatites from the Evje–Iveland and Froland pegmatite fields in southern Norway was analyzed for the entire …
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K-feldspar from feldspar pegmatites of the Kolmozero pegmatite field differs from those in the Kolmozero Li deposit in (i) low contents of Rb, Cs, Li, Tl, and an orthoclase component; and (ii ...
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THE DISTRIBUTION OF REE IN K-FELDSPAR IN NORWEGIAN PEGMATITES 139 uncommon in both Evje–Iveland and Froland (Bjørlykke 1935, Fought 1993, Stockmarr 1994). Re-cent studies document that the late ...
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K-feldspar from feldspar pegmatites of the Kolmozero pegmatite field differs from those in the Kolmozero Li deposit in (i) low contents of Rb, Cs, Li, Tl, and an orthoclase component; and (ii ...
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K-feldspar Testing Procedure In July 2024, Chariot's geologists completed the analysis using a pXRF (portable Xray fluorescence) - device on 218 potassium-feldspar/ K-feldspar samples collected from pegmatites exposed at surface at the Company's flagship Black Mountain project.
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(Rb,K)-feldspar also coprecipitates with end-member K-feldspar (+ cookeite), in metasomatic reactions of hydrothermal fluid with early Rb-bearing feldspar and pollucite at -300 to 150'C.
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A high Rb content occurs in K-feldspar from granitic pegmatites of the rare-element class, and particularly in the highly fractionated, complex, pollucite-bearing pegmatites of the LCT family [peraluminous, Li,Cs,Ta-enriched; cf. dernf (1991) for classificationl. These …
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Download scientific diagram | Plot of K/Rb vs. Cs (a) and K/Rb vs. Tl (b) in K-feldspar from the Sebago group pegmatites. Plot of K/Rb vs. Cs (c) and K/Rb vs. Li (d) in muscovite from the Sebago ...
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Pegmatite is a coarse-grained igneous rock, renowned for its exceptionally large crystals, Composed mainly of quartz, feldspar, and mica, it shares a similar composition to granite but differs significantly in its texture.. Pegmatite is an igneous rock distinguished by its exceptionally large crystals, typically exceeding 1 centimeter (0.4 inches) in diameter, and sometimes …
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The geochemistry of K‐feldspar for K, P, Sr, Ba, Rb, Cs, Ga, and of muscovite for the same elements plus Nb and Ta, was used for proving the parental relationships of S‐type granites and LCT (Li, Cs, Ta) rare‐element pegmatites in the southernmost pegmatitic field of the Pampean pegmatite province in Argentina. The variation of K/Rb‐Cs, K/Cs‐Rb, K/Rb‐Rb/Sr, …
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A review of K-feldspar compositions from miarolitic pegmatites shows that in most pegmatites the pocket K-feldspars are enriched in Rb and Cs relative to exopocket K-feldspar within the same body.
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K-feldspar from the Cap de Creus pegmatites exhibits higher contents in Ba, Rb, Cs, Nb, Y, Sn, V and Cr than albite. Albite is richer in Sr, Zr, Cu, As, Ce and Ga. Pb, Zn, W, Co and Ni have similar affinity for K-feldspar and albite. Muscovite exhibits similar geochemical evolution to K-feldspar. These progressive trends suggest a common origin ...
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K-feldspar in rocks is commonly seen as a heterogeneous mixture of mineral species and varieties with random microstructures. Most consider that observable features arise from incomplete re-equilibrations owing to slow kinetic and localized effects of aqueous fluids (catalyst), with geological environment and chemical impurities playing only a secondary role.
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The trace elements in K-feldspar are very useful geochemical indicators to assess not only the differentiation degree but also the potential for rare-metal mineralization in …
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Otherwise, the observed patterns of K/Rb or K/Cs in K-feldspar and micas in pegmatites conform to crystal-melt fractionation in which an aqueous solution plays no part. From the viewpoint of the ...
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Feldspars, micas, and tourmaline are the main rock-forming minerals in the Pusila leucogranites and pegmatites. Feldspars comprise K-feldspar and Na-rich plagioclase, and the …
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K-feldspar from feldspar pegmatites of the Kolmozero pegmatite field differs from those in the Kolmozero Li deposit in (i) low contents of Rb, Cs, Li, Tl, and an orthoclase component; and (ii ...
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