Late stage Variscan magmatism in the Strzelin Massif (SW Poland): SHRIMP zircon ages of tonalite and Bt-Ms granite of the Gęsiniec intrusion

• Autorzy: Oberc-Dziedzic T. , Kryza R.
• Języki publikacji: EN

Abstrakty

EN

The Gęsiniec composite intrusion in the northern part of the Strzelin Massif (Fore-Sudetic Block, SW Poland) was formed in the course of three late Variscan magmatic episodes: tonalitic I, granodioritic, and tonalitic II/granitic. The age of the Gęsiniec tonalite, 295 š3 Ma, is the same as that of another tonalite body in the southern part of the Strzelin Massif, the Kalinka tonalite. The younger biotite-muscovite (Bt-Ms) granite, in a dyke cutting the Gęsiniec tonalite, has an indistinguishable isotopic age of 295 š5 Ma; it contains, however, inherited zircons with ages between ca. 1.5 Ga to 374 Ma, similar to zircon ages from surrounding gneisses. This suggests that the magmatic protolith of gneisses and the magma of the Bt-Ms granite could have come from similar sources, or that the magma of the Bt-Ms granite was contaminated by the gneisses. Both the tonalite and Bt-Ma granite represent a late stage of the granitoid magmatism in the eastern part of the Variscan orogen.

Słowa kluczowe

EN

Strzelin Massif; Gęsiniec composite intrusion; Variscan granitoids; SHRIMP zircon ages

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2012
• Tom: Vol. 56, No 2
• Strony: 225--236
• Opis fizyczny: Bibliogr. 41 poz., tys., tab., wykr.

Twórcy

autor

Oberc-Dziedzic T.

autor

Kryza R.

• Institute of Geological Sciences, University of Wrocław, M. Borna 9, 50-204 Wrocław, Poland,

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