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Subduction-controlled temporal and spatial variations in early Palaeozoic sedimentary and volcanic record of the Mongol-Altai Domain
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SYSNO ASEP 0556473 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Subduction-controlled temporal and spatial variations in early Palaeozoic sedimentary and volcanic record of the Mongol-Altai Domain Author(s) Buriánek, D. (CZ)
Soejono, I. (CZ)
Schulmann, K. (CZ)
Janoušek, V. (CZ)
Hanžl, P. (CZ)
Čáp, P. (CZ)
Bold, U. (MN)
Svojtka, Martin (GLU-S) SAI, RID, ORCID
Collett, S. (CZ)
Žáček, V. (CZ)Article number 105182 Source Title Journal of Asian Earth Sciences. - : Elsevier - ISSN 1367-9120
Roč. 230, June (2022)Number of pages 23 s. Language eng - English Country NL - Netherlands Keywords Mongol-Altai Domain ; Magmatic arc ; Volcanic gap ; Back-arc extension ; Along-strike subduction variation ; Central Asian Orogenic Belt OECD category Geology Method of publishing Limited access Institutional support GLU-S - RVO:67985831 UT WOS 000810609200001 EID SCOPUS 85126944007 DOI 10.1016/j.jseaes.2022.105182 Annotation The early Palaeozoic volcano–sedimentary evolution of the Khovd and Gobi-Altai zones of the Mongol–Altai Domain was investigated by quantitative petrographic analysis of sediments, whole-rock geochemistry of volcanic rocks, and U–Pb zircon dating. Three evolutionary stages were identified in the Khovd Zone: (1) Cambrian–mid Ordovician basaltic (Nb/Yb = 0.09–1.25) and rhyodacitic (Nb/Yb = 4.36) volcanism and sedimentation of immature greywackes in the fore-arc basin in front of the juvenile continental arc, (2) late Ordovician flysch-type sedimentation accompanied by a volcanic gap coincided with Barrovian metamorphism in footwall sequences reflecting a compressional stage, and (3) Silurian–Devonian within-plate bimodal volcanism (with a strong asthenospheric imprint, Nb/Yb = 4.45–20.34) followed by mature siliciclastic deposition interpreted as transformation of the former fore-arc region into a back-arc domain associated with HT metamorphism. In the Gobi-Altai Zone the three stages were: (1) Cambro–Ordovician marginal greywacke–sandstone succession adjacent to a mature continental arc (mafic rocks Nb/Yb = 0.71–4.36), (2) Silurian siliciclastic sedimentation associated with migration of the volcanic gap and Barrovian metamorphism, and (3) Lower Devonian deep-marine sedimentation followed by shallow-marine carbonate sedimentation, initially accompanied by calc-alkaline basalts (Nb/Yb = 0.74–4.57) and andesites to rhyolites (Nb/Yb = 0.69–4.87), evolving in the mid–late Devonian to within-plate alkali basalts (Nb/Yb = 11.05) thus reflecting back-arc basin development. These temporal and spatial variations in the Mongol-Altai Domain are interpreted as a diachronous sequence of retreating and advancing subduction modes instead of juxtaposition of suspect terranes as proposed in previous studies. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2023 Electronic address https://www.sciencedirect.com/science/article/pii/S1367912022001055
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