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@article{1230692,
author = {Gadas, Petr and Novák, Milan and Cempírek, Jan and Filip, Jan and Vašinová Galiová, Michaela and Groat, Lee and Všianský, Dalibor},
article_number = {2},
keywords = {feruvite; schorl; EMPA; LA-ICP-MS; Mossbauer spectroscopy; powder and single crystal XRD; granitic pegmatite; contamination; Moldanubian Zone; Czech Republic},
language = {eng},
issn = {0008-4476},
journal = {Canadian Mineralogist},
title = {Mineral assemblages, comositional variation, and crystal structure of feruvitic tourmaline from a contaminated anatectic pegmatite at Mirošov near Strážek, Moldanubian Zone, Czech Republic},
volume = {52},
year = {2014}
}
TY - JOUR
ID - 1230692
AU - Gadas, Petr - Novák, Milan - Cempírek, Jan - Filip, Jan - Vašinová Galiová, Michaela - Groat, Lee - Všianský, Dalibor
PY - 2014
TI - Mineral assemblages, comositional variation, and crystal structure of feruvitic tourmaline from a contaminated anatectic pegmatite at Mirošov near Strážek, Moldanubian Zone, Czech Republic
JF - Canadian Mineralogist
VL - 52
IS - 2
SP - 285-301
EP - 285-301
PB - Mineralogical Association of Canada.
SN - 00084476
KW - feruvite
KW - schorl
KW - EMPA
KW - LA-ICP-MS
KW - Mossbauer spectroscopy
KW - powder and single crystal XRD
KW - granitic pegmatite
KW - contamination
KW - Moldanubian Zone
KW - Czech Republic
N2 - Amphibole-bearing, simply zoned, anatectic pegmatite, up to 20 cm thick, cuts calc-silicate rocks at Mirogov, near Strazek, in the Moldanubian Zone of the Czech Republic. Common amphibole (K-rich magnesio-hornblende to ferro-hastingsite), plagioclase An(30-42) and titanite, along with accessory feruvitic tourmaline-Ca-rich schorl to Na-rich feruvite-are indicators of Ca and Fe-contamination from the host rock. Interstitial tourmaline from the outer unit (TU1) and tourmaline from graphic intergrowths with quartz in more evolved parts of the pegmatite (TU2) have similar chemical compositions (EMPA, LA-ICP-MS) with Ca = 0.37-0.58 apfu, Al = 4.77-5.77 apfu; TU1 has higher Mg/(Mg + Fe-tot) = 0.52-0.41 compared to TU2 (0.39-0.15). TU1 is enriched in Ti, V, Cr, Sr, and TU2 in Li and Zn, respectively. Late microscopic veinlets of Na,Al,Mg-enriched tourmaline (TU3)-Ca-rich dravite/schorl-replace both TU1 and TU2. A combination of EMPA, single crystal XRD data, and bond-valence optimization applied to the TU2 data yielded the formula (x)(Ca-0 Na-494(0.451)square(0.055)) (Y)(Mg-0 Al-422(0) 365Fe1.1432+Fe0.9523+Mn0 (029) Ti0.084Zn0.005) (Z)(Al5.106Fe0 3773+Mg0.518) (T)(Si5.879Al0.121O18) (BO3)(3) [(OH)(2.656)O1.286F0.058], which represents disordered Na,Fe3+-rich feruvite (to "oxy-feruvite"). Contaminated pegmatite from Mirogov and its Ca-rich tourmalines are similar to other simple pegmatites from the Moldanubian Zone which have been contaminated by Ca,Fe-rich host rocks. The chemical compositions of Ca-rich schorl to Na-rich feruvite from various geological environments are similar, showing only minor dominance of Ca over Na.
ER -
GADAS, Petr, Milan NOVÁK, Jan CEMPÍREK, Jan FILIP, Michaela VAŠINOVÁ GALIOVÁ, Lee GROAT a Dalibor VŠIANSKÝ. Mineral assemblages, comositional variation, and crystal structure of feruvitic tourmaline from a contaminated anatectic pegmatite at Mirošov near Strážek, Moldanubian Zone, Czech Republic. \textit{Canadian Mineralogist}. Mineralogical Association of Canada., 2014, roč.~52, č.~2, s.~285-301. ISSN~0008-4476.
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