Variscan granitoid plutonism in the Strzelin Massif (SW Poland) : petrology and age of the composite Strzelin granite intrusion

Oberc-Dziedzic, T.; Kryza, R.; Pin, C.; Madej, S.

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Variscan granitoid plutonism in the Strzelin Massif (SW Poland) : petrology and age of the composite Strzelin granite intrusion

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Oberc-Dziedzic T. , Kryza R. , Pin C. , Madej S.

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Oberc-Dziedzic_T_Variscan_Geol. Quart_Vol.57_No 2_2013.pdf

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Petrological data and recently published U/Pb zircon SHRIMP ages reveal a protracted Variscan magmatic evolution in the Strzelin Massif (SW Poland), with three main stages of granitoid plutonism: 1 – tonalitic I, 2 – granodioritic and 3 – tonalitic II/granitic. The granitoids of the second and third stages form the Strzelin intrusion that is composed of three varieties: medium-grained biotite granite, fine-grained biotite granite and fine-grained biotite-muscovite granite. New SHRIMP data show that the medium-grained and fine-grained biotite granites comprise different zircon populations that reflect complex and prolonged plutonic processes. Two distinct magmatic events seem to be represented by well-defined zircon populations with apparent²⁰⁶Pb/²³⁸U ages of 303 ± 2 Ma in the medium-grained biotite granite, and 283 ± 8 Ma in the fine-grained biotite granite. These dates, however, do not necessarily reflect the true magmatic ages, possibly being “rejuvenated” by radiogenic lead loss in zircons (impossible to resolve based on routine SHRIMP data). Based on field evidence, the third variety, the biotite-muscovite granite, postdates both types of biotite granites. The petrographic and geochemical features, including Nd isotope signature, along with various zircon inheritance patterns and ages, suggest that the parental magmas of the three granites originated from different crustal sources and were emplaced during three successive magmatic pulses.

Słowa kluczowe

zircon SHRIMP geochronology composite granitoid plutons Variscan granitoids Strzelin Massif

Wydawca

Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy

Czasopismo

Geological Quarterly

Rocznik

2013

Tom

Vol. 57, No. 2

Strony

269–--288

Opis fizyczny

Bibliogr. 79 poz., rys., wykr.

Twórcy

autor

Oberc-Dziedzic T.

teresa.oberc-dziedzic@ing.uni.wroc.pl

Institute of Geological Sciences, Univer sity of Wrocław, M. Borna 9, 50-204 Wrocław, Poland

autor

Kryza R.

Institute of Geological Sciences, Univer sity of Wrocław, M. Borna 9, 50-204 Wrocław, Poland

autor

Pin C.

Département de Géologie, CNRS, Université Blaise Pascal, 5 rue Kessler, 63038 Clermont-Ferrand Cedex, France

autor

Madej S.

Institute of Geological Sciences, Univer sity of Wrocław, M. Borna 9, 50-204 Wrocław, Poland

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