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Permo"Triassic hypabyssal mafic intrusions and associated tholeiitic basalts of the Kolyuchinskaya Bay, Chukotka (NE Russia): Links to the Siberian LIP
Responsible organisation
2011 (English)In: Journal of Asian Earth Sciences, ISSN 1367-9120, Vol. 40Article in journal (Refereed) Published
Abstract [en]

In order to test tectonic hypotheses regarding the evolution of the Arctic Alaska-Chukotka microplate prior to the opening of the Amerasian basin, we investigated rocks exposed near Kolyuchinskaya Bay, eastern Chukotka. Hypabyssal mafic rocks and associated basaltic flows enclose terrigenous sediments, minor cherts and limestones in pillow interstices. The hypabyssal mafic rock yields a U-Pb zircon age of 252 +/- 4 Ma and indicates intrusion of basic magma at the Permo-Triassic boundary, contemporaneous with voluminous magmatism of the Siberian large igneous province (LIP). The lava flows and hypabyssal mafic rocks of the Kolyuchinskaya Bay region have trace elements, Sm-Nd and Rb-Sr isotope compositions identical to the tholeiitic flood basalts of the main plateau stage of the Siberian LIP, but differ from the latter in the major-element variations. We conclude that compositional variations in the hypabyssal rocks studied reflect their generation in an extensional environment that might be related to the Siberian super-plume activity at the time. Although the genetic and temporal links between intrusive mafic rocks and lavas are not well proved, compositional variations of the eruptive rocks still indicate their generation in an extensional environment. (C) 2010 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2011. Vol. 40
Keyword [en]
Chukotka microcontinent Permo-Triassic Tholeiitic magmatism Extension flood volcanic province subalkaline picrobasalts continental lithosphere experimental petrology plateau basalts mantle sources trace-element magmatism rocks evolution Geology
Research subject
SWEDARCTIC 2005, Beringia 2005
Identifiers
URN: urn:nbn:se:polar:diva-1912DOI: 10.1016/j.jseaes.2010.11.007OAI: oai:DiVA.org:polar-1912DiVA: diva2:810411
Note

ISI Document Delivery No.: 725GK Times Cited: 5 Cited Reference Count: 55 Ledneva, Galina V. Pease, Victoria L. Sokolov, Sergey D. Swedish Polar Research Secretariat; Swedish Research Council; Russian Foundation for Basic Research [08-05-00547, 10-05-00529]; research councils of Denmark, Norway, Sweden; Geological Survey of Finland; Swedish Museum of Natural History Samples were collected during the international 'Beringia-2005' expedition. Funding for this work is gratefully acknowledged from the Swedish Polar Research Secretariat, the Swedish Research Council, the Russian Foundation for Basic Research (Grants No. 08-05-00547 and No 10-05-00529). Thanks are also extended to M.J. Whitehouse and the Nordsim facility - the Nordsim facility is funded by the research councils of Denmark, Norway, Sweden, the Geological Survey of Finland, and the Swedish Museum of Natural History. This is Nordsim publication 270. 5 Pergamon-elsevier science ltd Oxford Geosciences, Multidisciplinary

Available from: 2015-05-07 Created: 2015-05-06 Last updated: 2015-06-05Bibliographically approved

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