Genesis of Regionally Metamorphosed Skarns from the Bohemian Massif: Contact Metasomatic vs. Sedimentary-Exhalative

0028617 - GLÚ 2006 DE eng C - Konferenční příspěvek (zahraniční konf.)
Drahota, Petr - Pertold, Z. - Pudilová, M.
Genesis of Regionally Metamorphosed Skarns from the Bohemian Massif: Contact Metasomatic vs. Sedimentary-Exhalative.
[Vznik regionálně metamorfovaných skarnů v Českém Masívu: kontaktně metasomatický vs. sedimentárně exhalační.]
Mineral Deposit Research: Meeting the Global Challenge : Proceedings of the Eighth Biennial SGA Meeting, Beijing, China, 18 - 21 August 2005. Berlin: Springer, 2005 - (Mao, J.; Bierlein, F.), s. 377-380. ISBN 3-540-27945-8.
[Mineral Deposit research: Meeting the Global Challenge. Biennial SGA Meeting /8./. Beijing (CN), 18.08.2005-21.08.2005]
Klíčová slova: skarn * geothermobarometry * oxygen isotopes * metamorphism
Kód oboru RIV: DD - Geochemie

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 18O 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.
Trvalý link: http://hdl.handle.net/11104/0118540