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Mid-Ordovician and Late Devonian magmatism in the Togtokhinshil Complex: new insight into the formation and accretionary evolution of the Lake Zone (western Mongolia)
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SYSNO ASEP 0459681 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Mid-Ordovician and Late Devonian magmatism in the Togtokhinshil Complex: new insight into the formation and accretionary evolution of the Lake Zone (western Mongolia) Author(s) Soejono, I. (CZ)
Buriánek, D. (CZ)
Svojtka, Martin (GLU-S) SAI, RID, ORCID
Žáček, V. (CZ)
Čáp, P. (CZ)
Janoušek, V. (CZ)Source Title Journal of Geosciences. - : Česká geologická společnost - ISSN 1802-6222
Roč. 61, č. 1 (2016), s. 5-23Number of pages 20 s. Publication form Print - P Language eng - English Country CZ - Czech Republic Keywords Central Asian Orogenic Belt ; geochemistry ; Lake Zone ; magmatism ; U-Pb zircon dating Subject RIV DD - Geochemistry Institutional support GLU-S - RVO:67985831 UT WOS 000372458600002 EID SCOPUS 84961248435 DOI 10.3190/jgeosci.208 Annotation New field, petrographic, geochemical and geochronological data from the Togtokhinshil Complex (western margin of the Lake Zone, Central Asian Orogenic Belt) reveal the presence of two separate Early Palaeozoic magmatic pulses: Mid-Ordovician and Late Devonian. The Mid-Ordovician (c. 460 Ma) magmatism produced various types of mafic plutonic rocks (gabbro-diorite suite) emplaced into the volcanosedimentary sequence of the Baatar Fm. Gabbros to gabbrodiorites have metaluminous and mostly low to normal-K calc-alkaline or possibly tholeiitic character. The majorand trace-element as well as Nd isotopic signatures suggest its magmatic-arc geotectonic setting and imply the derivation either exclusively from the mantle or in part from the juvenile mafic crust. The Late Devonian (c. 376 Ma) granite suite intruded the rocks of both the gabbro-diorite suite and the Baatar Fm. Granites are subaluminous and have a high-K calc-alkaline to shoshonitic character. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2017
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