Cadomian protolith ages of exotic mega blocks from Bugaj and Andrychów (Western outer Carpathians, Poland) and their palaeogeographic significance

• Autorzy: Burda Jolanta , Woskowicz-Ślęzak Beata , Klötzli Urs , Gawęda Aleksandra

Identyfikatory

DOI

10.1515/geochr-2015-0102

• Języki publikacji: EN

Abstrakty

EN

This study presents the first zircon U-Pb LA-MC-ICP-MS ages and whole-rock Rb/Sr and Sm/Nd data from exotic blocks (Bugaj and Andrychów) from the Western Outer Carpathians (WOC) flysch. The CL images of the zircon crystals from both samples reveal typical magmatic textures characterized by a well-defined concentric and oscillatory growth zoning. A concordia age 580.1 ± 6.0 Ma of the zircons from the Bugaj sample is considered to represent the crystallization age of this granite. The zircon crystals from the Andrychów orthogneiss yield an age of 542 ± 21 Ma, interpreted as the uppermost Proterozoic, magmatic crystallization age of the granitoid protholith. The initial (at ca. 580 Ma) 87Sr/86Sr ratios of the Bugaj granitoids (0.72997 and 0.72874) are highly radiogenic, pointing to the assimilation of an older, possibly strongly Rb enriched source to the Bugaj melt. The Nd isotope systematics (εNd580 –1.4 and 0.4) also point to a significant contribution of such a distinct mantle source. On the basis of the sequence of magmatic events obtained from U-Pb zircon ages, we suggest that exotic mega blocks deposited to the WOC basins were related to the Brunovistulicum Terrane. They belong to the group of Vendian/Cambrian granitoids representing the latest, posttectonic expression of the Cadomian cycle.

Słowa kluczowe

EN

exotics; zircon U-Pb dating; Western Outer Carpathians; palaeogeography; Brunovistulicum

• Wydawca: De Gruyter
• Czasopismo: Geochronometria
• Rocznik: 2019
• Tom: Vol. 46, no. 1
• Strony: 25--36
• Opis fizyczny: Bibliogr. 68 poz., rys., tab.

Twórcy

autor

Burda Jolanta

• Faculty of Earth Sciences, University of Silesia, Będzińska st. 60, 41-200 Sosnowiec, Poland

autor

Woskowicz-Ślęzak Beata

• Faculty of Earth Sciences, University of Silesia, Będzińska st. 60, 41-200 Sosnowiec, Poland

autor

Klötzli Urs

• Department of Lithospheric Research, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria

autor

Gawęda Aleksandra

• Faculty of Earth Sciences, University of Silesia, Będzińska st. 60, 41-200 Sosnowiec, Poland

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).