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DOI	10.1007/s00531-020-01858-0
	Baltica and the Cadomian orogen in the Ediacaran–Cambrian: a perspective from SE Poland
	Żelaźniewicz A.; Oberc-Dziedzic T.; Slama J.
发表日期	2020
ISSN	14373254
起始页码	1503
结束页码	1528
卷号	109 期号:5
英文摘要	In the supercontinent of Rodinia, Baltica occurred next to Amazonia, then the two drifted away when Rodinia broke up. By the end of the Neoproterozoic, Baltica became an independent continent. At that time, Timanide orogen developed at its modern northeastern margin. In most paleogeographical reconstructions, the opposite (SW, Tornquist) edge faced the Tornquist Ocean and remained just a passive margin till the arrival of the Gondwana-born East Avalonia in the late Ordovician. However, preliminary isotopic studies of detrital zircons from the Tornquist passive margin succession hinted that rock components of Gondwana derivation reached Baltica already in the early Cambrian. In this paper, we examine 18 drill-cores of Ediacaran-Cambrian and Ordovician siliciclastic rocks from the tectonostratigraphic units along the SW–NE transect from Upper Silesia (USB) via Małopolska (MB) and the Holy Cross Mts (HCM) to the East European Platform (EEP), SE Poland, in terms of the provenance data gained from the LA-ICP-MS and SHRIMP analyses of 32 zircon samples. Rocks from all the units revealed abundant Cadomian 0.7–0.55 Ga detrital zircons (15–50% of the total analyzed grains) and other grains that yielded peaks at 0.9–1.2, 1.4–1.6, 1.8–2.2, 2.7–3.0 Ga assignable to Baltica rather than Amazonia. Such age spectra in the USB, HCM and EEP prove the proximity of peripheral (peri-Gondwanan) fragments of the Cadomian orogen to Baltica. These fragments formed the Teissyere-Tornquist Terrane Assemblage (TTA) that obliquely docked and overrode the thinned southwestern edge of Baltica which earlier accumulated Neoproterozoic rift and passive margin deposits. Our data show that in the late Ediacaran-early Cambrian, parts of the Cadomian orogenic belt became accreted to Baltica. © 2020, The Author(s).
英文关键词	Amazonia; Baltica; Cadomia; Ediacaran; Provenance; Zircon
语种	英语
scopus关键词	Cambrian; Ediacaran; orogenic belt; orogeny; paleogeography; passive margin; Proterozoic; provenance; reconstruction; Rodinia; siliciclastic deposit; tectonostratigraphy; Poland [Central Europe]
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147661
作者单位	Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Wrocław, ul. Podwale 75, Wrocław, Poland; Institute of Geological Sciences, University of Wrocław, pl. Borna 9, Wrocław, 50-204, Poland; Institute of Geology, ASCR (The Czech Academy of Sciences), Rozvojová 269, Prague 6, 16500, Czech Republic
推荐引用方式 GB/T 7714	Żelaźniewicz A.,Oberc-Dziedzic T.,Slama J.. Baltica and the Cadomian orogen in the Ediacaran–Cambrian: a perspective from SE Poland[J],2020,109(5).
APA	Żelaźniewicz A.,Oberc-Dziedzic T.,&Slama J..(2020).Baltica and the Cadomian orogen in the Ediacaran–Cambrian: a perspective from SE Poland.International Journal of Earth Sciences,109(5).
MLA	Żelaźniewicz A.,et al."Baltica and the Cadomian orogen in the Ediacaran–Cambrian: a perspective from SE Poland".International Journal of Earth Sciences 109.5(2020).