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Geochemistry of Fe-rich peridotites and associated pyroxenites from Horní Bory, Bohemian Massif: insights into subduction-related melt-rock reactions
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SYSNO ASEP 0321103 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Geochemistry of Fe-rich peridotites and associated pyroxenites from Horní Bory, Bohemian Massif: insights into subduction-related melt-rock reactions Title Geochemie Fe-bohatých peridotitů a souvisejících pyroxenitů z Horních Borů, Český masiv: pohled na reakce hornina-tavenina spjaté se subdukcí Author(s) Ackerman, Lukáš (GLU-S) RID, SAI, ORCID
Jelínek, E. (CZ)
Medaris Jr., G. (US)
Ježek, J. (CZ)
Siebel, W. (DE)
Strnad, L. (CZ)Source Title Chemical Geology. - : Elsevier - ISSN 0009-2541
Roč. 259, 3-4 (2009), s. 152-167Number of pages 16 s. Publication form WWW - WWW Language eng - English Country NL - Netherlands Keywords peridotite ; dunite-wehrlite ; melt-rock reaction Subject RIV DD - Geochemistry R&D Projects IAA3013403 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z30130516 - GLU-S (2005-2011) UT WOS 000264060000006 EID SCOPUS 59249089698 DOI 10.1016/j.chemgeo.2008.10.042 Annotation Variscan, mantle-derived peridotites and associated pyroxenites occur as boudins in Moldanubian granulite near the town of Horní Bory in western Moravia. The peridotites consist of two compositionally distinct suites, one of Mg-lherzolite (Mg-number = 89-91, 87Sr/86Sr = 0.7046-0.7068, eNd = +4.1 to +5.3), and another of Fe-dunite/wehrlite (Mg-number = 83-88, 87Sr/86Sr = 0.7079-0.7087, eNd = –2.8 to –1.3). Modelling of Mg-Fe exchange between peridotite and Fe-rich melts reveals that the modal and chemical composition of the Fe-dunite/wehrlite suite can be produced by melt-rock reactions between lherzolite and SiO2-undersaturated melts of basaltic composition at melt/rock ratios ranging from 0.3 to 2. In such a model, pyroxenites represent the crystalline product (+-trapped liquid) of melts migrating along conduits in peridotite. The Fe-dunite/wehrlite suite and pyroxenites are enriched in the LILE and depleted in the HFSE. The trace element and Sr-Nd isotopic compositions of Horní Bor. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2009
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