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Article: Neoproterozoic-Early Paleozoic Peri-Pacific Accretionary Evolution of the Mongolian Collage System: Insights From Geochemical and U-Pb Zircon Data From the Ordovician Sedimentary Wedge in the Mongolian Altai

TitleNeoproterozoic-Early Paleozoic Peri-Pacific Accretionary Evolution of the Mongolian Collage System: Insights From Geochemical and U-Pb Zircon Data From the Ordovician Sedimentary Wedge in the Mongolian Altai
Authors
KeywordsActive margin sediments
Mongolian Altai
Neoproterozoic-early Paleozoic
Peri-Pacific accretion
Turbidite basin
Issue Date2017
PublisherAmerican Geophysical Union. The Journal's web site is located at http://agupubs.onlinelibrary.wiley.com/agu/journal/10.1002/(ISSN)1944-9194/
Citation
Tectonics, 2017, v. 36 n. 11, p. 2305-2331 How to Cite?
AbstractNeoproterozoic to early Paleozoic accretionary processes of the Central Asian Orogenic Belt have been evaluated so far mainly using the geology of ophiolites and/or magmatic arcs. Thus, the knowledge of the nature and evolution of associated sedimentary prisms remains fragmentary. We carried out an integrated geological, geochemical, and zircon U-Pb geochronological study on a giant Ordovician metasedimentary succession of the Mongolian Altai Mountains. This succession is characterized by dominant terrigenous components mixed with volcanogenic material. It is chemically immature, compositionally analogous to graywacke, and marked by significant input of felsic to intermediate arc components, pointing to an active continental margin depositional setting. Detrital zircon U-Pb ages suggest a source dominated by products of early Paleozoic magmatism prevailing during the Cambrian-Ordovician and culminating at circa 500 Ma. We propose that the Ordovician succession forms an “Altai sedimentary wedge,” the evolution of which can be linked to the geodynamics of the margins of the Mongolian Precambrian Zavhan-Baydrag blocks. This involved subduction reversal from southward subduction of a passive continental margin (Early Cambrian) to the development of the “Ikh-Mongol Magmatic Arc System” and the giant Altai sedimentary wedge above a north dipping subduction zone (Late Cambrian-Ordovician). Such a dynamic process resembles the tectonic evolution of the peri-Pacific accretionary Terra Australis Orogen. A new model reconciling the Baikalian metamorphic belt along the southern Siberian Craton with peri-Pacific Altai accretionary systems fringing the Mongolian microcontinents is proposed to explain the Cambro-Ordovician geodynamic evolution of the Mongolian collage system. ©2017. American Geophysical Union. All Rights Reserved.
Persistent Identifierhttp://hdl.handle.net/10722/264106
ISSN
2017 Impact Factor: 3.583
2015 SCImago Journal Rankings: 2.628
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorJiang, Y-
dc.contributor.authorSchulmann, K-
dc.contributor.authorKroner, A-
dc.contributor.authorSun, M-
dc.contributor.authorLexa, O-
dc.contributor.authorJanousek, V-
dc.contributor.authorBurianek, D-
dc.contributor.authorYuan, C-
dc.contributor.authorHanzl, P-
dc.date.accessioned2018-10-22T07:49:40Z-
dc.date.available2018-10-22T07:49:40Z-
dc.date.issued2017-
dc.identifier.citationTectonics, 2017, v. 36 n. 11, p. 2305-2331-
dc.identifier.issn0278-7407-
dc.identifier.urihttp://hdl.handle.net/10722/264106-
dc.description.abstractNeoproterozoic to early Paleozoic accretionary processes of the Central Asian Orogenic Belt have been evaluated so far mainly using the geology of ophiolites and/or magmatic arcs. Thus, the knowledge of the nature and evolution of associated sedimentary prisms remains fragmentary. We carried out an integrated geological, geochemical, and zircon U-Pb geochronological study on a giant Ordovician metasedimentary succession of the Mongolian Altai Mountains. This succession is characterized by dominant terrigenous components mixed with volcanogenic material. It is chemically immature, compositionally analogous to graywacke, and marked by significant input of felsic to intermediate arc components, pointing to an active continental margin depositional setting. Detrital zircon U-Pb ages suggest a source dominated by products of early Paleozoic magmatism prevailing during the Cambrian-Ordovician and culminating at circa 500 Ma. We propose that the Ordovician succession forms an “Altai sedimentary wedge,” the evolution of which can be linked to the geodynamics of the margins of the Mongolian Precambrian Zavhan-Baydrag blocks. This involved subduction reversal from southward subduction of a passive continental margin (Early Cambrian) to the development of the “Ikh-Mongol Magmatic Arc System” and the giant Altai sedimentary wedge above a north dipping subduction zone (Late Cambrian-Ordovician). Such a dynamic process resembles the tectonic evolution of the peri-Pacific accretionary Terra Australis Orogen. A new model reconciling the Baikalian metamorphic belt along the southern Siberian Craton with peri-Pacific Altai accretionary systems fringing the Mongolian microcontinents is proposed to explain the Cambro-Ordovician geodynamic evolution of the Mongolian collage system. ©2017. American Geophysical Union. All Rights Reserved.-
dc.languageeng-
dc.publisherAmerican Geophysical Union. The Journal's web site is located at http://agupubs.onlinelibrary.wiley.com/agu/journal/10.1002/(ISSN)1944-9194/-
dc.relation.ispartofTectonics-
dc.rightsTectonics. Copyright © American Geophysical Union.-
dc.rightsPreprint Submitted for publication in (journal title). Postprint Accepted for publication in (journal title). Copyright (year) American Geophysical Union. Further reproduction or electronic distribution is not permitted. Published version An edited version of this paper was published by AGU. Copyright (year) American Geophysical Union.-
dc.subjectActive margin sediments-
dc.subjectMongolian Altai-
dc.subjectNeoproterozoic-early Paleozoic-
dc.subjectPeri-Pacific accretion-
dc.subjectTurbidite basin-
dc.titleNeoproterozoic-Early Paleozoic Peri-Pacific Accretionary Evolution of the Mongolian Collage System: Insights From Geochemical and U-Pb Zircon Data From the Ordovician Sedimentary Wedge in the Mongolian Altai-
dc.typeArticle-
dc.identifier.emailSun, M: minsun@hku.hk-
dc.identifier.authoritySun, M=rp00780-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/2017TC004533-
dc.identifier.scopuseid_2-s2.0-85032923483-
dc.identifier.hkuros294815-
dc.identifier.volume36-
dc.identifier.issue11-
dc.identifier.spage2305-
dc.identifier.epage2331-
dc.identifier.isiWOS:000418334800002-
dc.publisher.placeUnited States-

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