Počet záznamů: 1
A reworked Lake Zone margin: Chronological and geochemical constraints from the Ordovician arc-related basement of the Hovd Zone (western Mongolia)
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SYSNO ASEP 0487425 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název A reworked Lake Zone margin: Chronological and geochemical constraints from the Ordovician arc-related basement of the Hovd Zone (western Mongolia) Tvůrce(i) Soejono, I. (CZ)
Buriánek, D. (CZ)
Janoušek, V. (CZ)
Svojtka, Martin (GLU-S) SAI, RID, ORCID
Čáp, P. (CZ)
Erban, V. (CZ)
Ganpurev, D. (MN)Zdroj.dok. Lithos. - : Elsevier - ISSN 0024-4937
294/295, December (2017), s. 112-132Poč.str. 21 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova Ordovician magmatic arc ; Mid-Silurian intra-plate magmatism ; Hovd Zone ; Reworked Lake Zone Vědní obor RIV DB - Geologie a mineralogie Obor OECD Geology Institucionální podpora GLU-S - RVO:67985831 UT WOS 000418970800008 EID SCOPUS 85033584688 DOI 10.1016/j.lithos.2017.08.014 Anotace The Mongolian tract of the Central Asian Orogenic Belt (CAOB) are still poorly constrained. This brings much uncertainty in understanding of the orogeny configuration and the complete accretionary history. Results of our field work, new U–Pb zircon ages and whole-rock geochemical data suggest an existence of two separate magmatic events within the evolution of the Khuurai Tsenkher Gol Complex. Early to Mid-Ordovician (476 ± 5 Ma and 467 ± 4 Ma protoliths) normal- to high-K calc-alkaline orthogneisses, metadiorites and metagabbros predominate over Mid-Silurian (430 ± 3 Ma) tholeiitic–mildly alkaline quartz monzodiorites. Whereas the geochemical signature of the former suite unequivocally demonstrates its magmatic-arc origin, that of the latter quartz monzodiorite suggests an intra-plate setting. As shown by Sr–Nd isotopic data, the older arc-related magmas were derived from depleted mantle and/or were generated by partial melting of juvenile metabasic crust. Detrital zircon age populations of the metasedimentary rocks together with geochemical signatures of the associated amphibolites imply that the Bij Group was a volcano-sedimentary sequence, formed probably in the associated fore-arc wedge basin.Moreover, our data argue for an identical provenance of the Altai and Hovd domains, overall westward sediment transport during the Early Palaeozoic and the east-dipping subduction polarity. Pracoviště Geologický ústav Kontakt Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Rok sběru 2018
Počet záznamů: 1