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Tytuł: Age and origin of fluorapatite-rich dyke from Baranec Mt. (Tatra Mts., Western Carpathians) : a key to understanding of the post-orogenic processes and element mobility
Autor: Gawęda, Aleksandra
Szopa, Krzysztof
Chew, David
Klotzli, Urs
Muller, Axel
Sikorska, Magdalena
Pyka, Paulina
Słowa kluczowe: Apatite; Dyke; Tatra Mountains; U-Pb apatite age
Data wydania: 2016
Źródło: Geologica Carpathica, Vol. 67, iss. 5 (2016), p. 417-432
Abstrakt: On the southeastern slope of the Baranec Mount in the Western Tatra Mountains (Slovakia) an apatite-rich pegmatite-like segregation was found in the subvertical fault zone cutting metapelitic rocks. Two zones: felsic (F) and mafic (M) were found, differing in mineral assemblages and consequently in chemistry. Fluorapatite crystals yield a LA-ICP-MS U-Pb age of 328.6 ± 2.4 Ma. A temperature decrease from 634 °C to 454 °C at a pressure around 500 to 400 MPa with oxygen fugacity increasing during crystallization are the possible conditions for formation of the pegmatite-like segregation, while secondary alterations took place in the temperature range of 340-320 °C. The Sr-Nd isotope composition of both apatite and whole rock point toward a crustal origin of the dike in question, suggesting partial melting of (P, F, H2O)-rich metasedimentary rocks during prolonged decompression of the Tatra Massif. The original partial melt (felsic component) was mixed with an external (F, H2O)-rich fluid, carrying Fe and Mg fluxed from more mafic metapelites and crystallizing as biotite and epidote in the mafic component of the dyke.
DOI: 10.1515/geoca-2016-0026
ISSN: 1335-0552
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