Počet záznamů: 1
Hydroxycalciopyrochlore from a regionally metamorphic marble at Bližná, Southwestern Czech Republic
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SYSNO ASEP 0467978 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Hydroxycalciopyrochlore from a regionally metamorphic marble at Bližná, Southwestern Czech Republic Tvůrce(i) Drábek, M. (CZ)
Frýda, J. (CZ)
Šarbach, M. (CZ)
Skála, Roman (GLU-S) RID, SAI, ORCIDZdroj.dok. Neues Jahrbuch für Mineralogie. Abhandlungen - ISSN 0077-7757
Roč. 194, č. 1 (2017), s. 49-59Poč.str. 11 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova hydroxycalciopyrochlore ; pyrochlore ; carbonatite-like marble ; marble ; Moldanubian Varied Group Vědní obor RIV DB - Geologie a mineralogie Obor OECD Mineralogy Institucionální podpora GLU-S - RVO:67985831 UT WOS 000395225300005 EID SCOPUS 85009483636 DOI https://doi.org/10.1127/njma/2016/0014 Anotace We describe an unusual occurrence of hydroxycalciopyrochlore in marble exposed in the Václav graphite mine at Bližná, southern Czech Republic. Roundish grains attain up to 3 cm, and euhedral crystals are up to 2 mm across. An empirical formula, calculated on the basis two B atoms per formula unit (pfu), is: (Ca0.48Na0.02Mg0.06Mn0.01Y0.06.SIGMA.REEs0.27Th0.27U0.01).SIGMA.1.12 (Nb1.06Ti0.79Fe0.14W0.01).SIGMA.2 (O4.96OH1.04).SIGMA.6(OH)0.81•H2O. The associated minerals, in addition to the rock-forming minerals calcite, phlogopite and edenite, include ilmenite, magnetite, euxenite, uranoan thorite, rutile, zircon, molybdenite, chalcopyrite, galena, sphalerite, pyrite, pyrrhotite, barite and apatite. This is the first occurrence of a pyrochlore-group mineral in regionally metamorphosed marble. The assemblage is considered to represent a metamorphosed carbonate-dominated sediment containing evaporitic horizons and volcanic detritus. Now give the reader an explanation, what makes it carbonatite-like? Pracoviště Geologický ústav Kontakt Jana Popelková, popelkova@gli.cas.cz, Tel.: 226 800 273 Rok sběru 2018
Počet záznamů: 1