Gneiss protolith ages and tectonic boundaries in the NE part of the Bohemian Massif (Fore-Sudetic Block, SWPoland

Oberc-Dziedzic, T.; Kryza, R.; Klimas, K.; Fanning, M.C.; Madej, S.

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Tytuł artykułu

Gneiss protolith ages and tectonic boundaries in the NE part of the Bohemian Massif (Fore-Sudetic Block, SWPoland

Autorzy

Oberc-Dziedzic T. , Kryza R. , Klimas K. , Fanning M.C. , Madej S.

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Abstrakty

Published geochronological data, petrology, geochemistry and geological context of orthogneisses in the Strzelin and the Stachów complexes (NE-part of the Fore-Sudetic Block), together with structural observations help to locate the northern extension of the boundary between the East and West Sudetes within the poorly exposed NE margin of the Bohemian Massif. The Strzelin complex, in the east, comprises the Strzelin gneiss, with zircon ages of 600š7 and 568š7Ma, and the Nowolesie gneiss with a mean zircon age of 1020_ 1Ma. The Stachów complex to the west, which forms several tectonic klippen in the Strzelin Massif and in the Lipowe Hills Massif, contains the Gościęcice gneiss and pale Stachów gneiss, both yielding Late Cambrian zircon ages (~500š5 Ma). The orthogneisses in both complexes correspond to peraluminous S-type granites, but have different inherited zircon ages and display contrasting trace element characteristics, indicating different sources and petrogenetic histories. Based on the ages, petrology and overall geological context, the Strzelin orthogneiss is similar to the Keprník orthogneiss of the East Sudetes, whereas the orthogneisses of the Stachów complex correspond to rocks known from theWest Sudetes (e.g. the Izera and Śnieżnik orthogneisses). The Stachów and the Strzelin complexes are separated by the Strzelin Thrust, which may be interpreted as the northern extension of the boundary between the East and West Sudetes, i.e. part of the boundary between the Brunovistulian and Moldanubian terranes of the NE part of the Bohemian Massif.

Słowa kluczowe

Bohemian Massif East-West Sudetes boundary zircon ages

Wydawca

Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy

Czasopismo

Geological Quarterly

Rocznik

2005

Tom

Vol. 49, No. 4

Strony

363--378

Opis fizyczny

Bibliogr. 83 poz., rys., tab., wykr.

Twórcy

autor

Oberc-Dziedzic T.

Institute of Geological Sciences, University of Wrocław, Poland

autor

Kryza R.

Institute of Geological Sciences, University of Wrocław, Poland

autor

Klimas K.

Institute of Geological Sciences, University of Wrocław, Poland

autor

Fanning M.C.

Mark.Fanning@anu.edu.au

Research School of Earth Sciences, Australian National University, Mills Road, Canberra, ACT, 0200 Australia

autor

Madej S.

Institute of Geological Sciences, University of Wrocław, Poland

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