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Published in:
2005 | OriginalPaper | Chapter
Genesis of regionally metamorphosed skarns from the Bohemian Massif: Contact metasomatic versus sedimentary-exhalative
Authors : P. Drahota, Z. Pertold, M. Pudilová
Published in: Mineral Deposit Research: Meeting the Global Challenge
Publisher: Springer Berlin Heidelberg
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Several skarns were studied in the northern part of the high-grade Moldanubian zone, Bohemian Massif (Czech Republic). Three different kinds of skarn were distinguished on the basis of their host environment, and their mineralogical and isotopic compositions. Regionally metamorphosed skarns reflect post-peak metamorphic decompression after high pressure-high temperature regional metamorphism (approximately 800°C and 12 kbars) and younger regional metamorphism (670°C, 6–8 kbars) accompanied by intrusion of an orthogneiss body. Analysed d180 values from the skarn minerals are not compatible with a post-peak metamorphic contact metasomatic origin associated with emplacement of the orthogneiss. The skarn precursors are interpreted to have been an integral part of the primary (volcano-) sedimentary successions in these Moldanubian localities, and a submarine exhalative origin is inferred.