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@article{1164684,
author = {Čopjaková, Renata and Škoda, Radek and Vašinová Galiová, Michaela and Novák, Milan},
article_location = {Praha},
article_number = {2},
doi = {http://dx.doi.org/10.3190/jgeosci.138},
keywords = {Y plus REE and Sc; tourmaline composition; melt evolution; LA-ICP-MS; NYF pegmatites; Trebic Pluton},
language = {eng},
issn = {1802-6222},
journal = {Journal of Geosciences},
title = {Distributions of Y plus REE and Sc in tourmaline and their implications for the melt evolution; examples from NYF pegmatites of the Trebic Pluton, Moldanubian Zone, Czech Republic},
volume = {58},
year = {2013}
}
TY - JOUR
ID - 1164684
AU - Čopjaková, Renata - Škoda, Radek - Vašinová Galiová, Michaela - Novák, Milan
PY - 2013
TI - Distributions of Y plus REE and Sc in tourmaline and their implications for the melt evolution; examples from NYF pegmatites of the Trebic Pluton, Moldanubian Zone, Czech Republic
JF - Journal of Geosciences
VL - 58
IS - 2
SP - 113-131
EP - 113-131
PB - Czech geol.Soc
SN - 18026222
KW - Y plus REE and Sc
KW - tourmaline composition
KW - melt evolution
KW - LA-ICP-MS
KW - NYF pegmatites
KW - Trebic Pluton
N2 - Tourmalines from NYF and mixed (NYF + LCT) pegmatites of the Trebic Pluton (Moldanubian Zone, Czech Republic) are generally characterized by variable and relatively high concentrations of Y + REE (4-457 ppm) and Sc (18-765 ppm). They show enrichment in LREE (Ce > La); the chondrite-normalized REE patterns decrease uniformly from La to Tb; Tb to Tm are mostly below the detection limits (<0.01-0.08 ppm) and are followed by an upturn to Yb and Lu. Our textural and paragenetic observations indicate that growth of magmatic tourmaline reflects Y + REE contents in the melt. Tourmaline is highly compatible with Sc and shows exceptionally high contents of Sc compared to the analyzed host pegmatite units (less than 1 ppm Sc). The contents of Sc positively correlate with Sigma Y + REE. Two distinct evolutionary trends of trace-elements in tourmaline were distinguished. (i) A conspicuous increase in Y + REE and Sc in tourmaline (dravite, Ca-rich dravite) from primitive euxenite-type pegmatites reflects their enrichment in the melt with the progressive crystallization and fractionation. It also was enhanced by low P (<0.02 wt. % P2O5) and Ca contents (<0.8 wt. % CaO) in host pegmatite unit preventing precipitation of Y + REE phosphates and allanite, respectively. (ii) Tourmaline (schorl, fluor-schorl, fluor-elbaite) from more evolved pegmatites (evolved euxenite-type and mixed (NYF + LCT) pegmatite) show a depletion in REE and Sc with progressive crystallization reflecting most likely the coeval precipitation of REE-rich minerals, especially monazite-(Ce), xenotime-(Y), samarskite- and aeschynite-group minerals. The Eu anomalies in tourmaline vary significantly from positive (up to Eu/Eu* similar to 16) to substantially negative ones and are related to the Eu contents in the melt and degree of its fractionation.
ER -
ČOPJAKOVÁ, Renata, Radek ŠKODA, Michaela VAŠINOVÁ GALIOVÁ and Milan NOVÁK. Distributions of Y plus REE and Sc in tourmaline and their implications for the melt evolution; examples from NYF pegmatites of the Trebic Pluton, Moldanubian Zone, Czech Republic. \textit{Journal of Geosciences}. Praha: Czech geol.Soc, 2013, vol.~58, No~2, p.~113-131. ISSN~1802-6222. Available from: https://dx.doi.org/10.3190/jgeosci.138.
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