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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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 …
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 spectrum of rare-earth elements, as well as for a suite of major and trace elements, with the HR–LA–ICP–MS technique.Earlier results imply that the two pegmatite fields are nearly …
Textural features of the pegmatites (e.g., comb-textured K-feldspar) and aplites indicate a single period of dilatancy and infilling to form the sheets. View.
During the formation of U-, Th-, Mo-, REE-, and Nb-bearing granitic pegmatites in the Grenville Province, conditions of crystallization were such that widespread graphic quartz-feldspar ...
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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 ...
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 …
Corpus ID: 126883040; Typomorphic features of amazonitic K-feldspar from the Keivy granitic pegmatite (Kola Peninsula, Russia) @article{Ostrooumov2005TypomorphicFO, title={Typomorphic features of amazonitic K-feldspar from the Keivy granitic pegmatite (Kola Peninsula, Russia)}, author={Mikhail Ostrooumov and Arun Banerjee}, …
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484 THE CANADIAN MINERALOGIST INrnooucrrow Rubidium-rich feldspar has rarely been described in the literature. A high Rb content occurs in K-feldspar from granitic pegmatites of the rare-element ...
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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 ...
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 …
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.
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. …
In petrography, pegmatites are essentially composed of quartz, plagioclase, k-feldspar (microcline), muscovite, biotite, tourmaline and garnet.
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 …
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 …
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.
PDF | On Jan 1, 2011, L. Sanchez-Muñoz and others published K-feldspar minerals defined from their twin-structures: Application to a preliminary classification of pegmatites | Find, read and cite ...
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 …
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 spectrum of rare-earth elements, as well as for a suite of majo r and trace elements, with the HR–LA–ICP–MS technique. Earlier results imply that the two pegmatite fields are …
THE DISTRIBUTION OF RARE-EARTH ELEMENTS IN K-FELDSPAR AS AN INDICATOR OF PETROGENETIC PROCESSES IN GRANITIC PEGMATITES: EXAMPLES FROM TWO PEGMATITE FIELDS IN SOUTHERN NORWAY. Publication. The Canadian Mineralogist. Record type. Journal article Published. 1 February 2002. Authors.
In a previous study [24], we showed that intensive feldspar replacement was induced by the sequential infiltration of Na-and K-rich fluids from the pegmatites into the metamorphic rocks under ...
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 …
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 ...
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 ...
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 pegmatites aftain a …
