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Article: Paleozoic multiple subduction-accretion processes of the southern Altaids

TitlePaleozoic multiple subduction-accretion processes of the southern Altaids
Authors
Issue Date2009
PublisherAmerican Journal of Science. The Journal's web site is located at http://www.ajsonline.org
Citation
American Journal Of Science, 2009, v. 309 n. 3, p. 221-270 How to Cite?
AbstractThe formation and development of the southern Altaids is controversial with regard to its accretionary orogenesis and continental growth. The Altay-East Junggar orogenic collage of North Xinjiang, China, offers a special natural laboratory to resolve this puzzle. Three tectonic units were juxtaposed, roughly from North to South, in the study area. The northern part (Chinese Altay), composed of variably deformed and metamorphosed Paleozoic sedimentary, volcanic, and granitic rocks, is interpreted as a Japan-type island arc of Paleozoic to Carboniferous-Permian age. The central part (Erqis), which consists of ophiolitic mélanges and coherent assemblages, is a Paleozoic accretionary complex. The southern part (East Junggar), characterized by imbricated ophiolitic mélanges, Nb-enriched basalts, adakitic rocks and volcanic rocks, is regarded as a Devonian-Carboniferous intra-oceanic island arc with some Paleozoic ophiolites, superimposed by Permian arc volcanism. A plagiogranite from an imbricated ophiolitic mélange (Armantai) in the East Junggar yields a new SHRIMP zircon age of 503 ± 7 Ma. Using published age constraints, we propose the presence of multiple subduction systems in this part of the Paloasian Ocean in the Paleozoic. The intraoceanic arcs became accreted to the southern active margin of the Siberian craton in the middle Carboniferous-Permian. During the long accretionary processes, in addition to large-scale southward-directed thrusting, large-scale, orogen-parallel, strikeslip movements (for example, Erqis fault) in the Permian translated fragments of these intraoceanic arcs and associated accretionary wedges. This new tectonic model has broad implications for the architecture and crustal growth of Central Asia and for other ancient orogens.
Persistent Identifierhttp://hdl.handle.net/10722/58655
ISSN
2015 Impact Factor: 3.566
2015 SCImago Journal Rankings: 2.104
ISI Accession Number ID
Funding AgencyGrant Number
Chinese State 973 Program2007CB41.1307
Natural Science Foundation Of China40725009
40523003
Funding Information:

We appreciate the assistance of staff in the Beijing SHRIMP Laboratory. Thanks are clue to many MSc and PhD students whose field and laboratory work provided many elements on which the present synthesis was built, in particular Q. G. Mao, Y. P. Long, K. Wong, and R. D. Cai. We are indebted to J.Y. Li J. Gao, Z.J. Guo, Z.L. Chen, A. M. C. Sengor, N. Arnaud, D. Alexeiev, A. S. Yakubchuk, and M. S. Hendrix for their generosity with time, ideas, and advice. Critical reviews by Richard Glen, and M. A. Lamb have significantly improved the original draft of the manuscript. Funds from the Chinese State 973 Program (2007CB41.1307) and the Natural Science Foundation Of China Projects (40725009 and 40523003) are gratefully acknowledged. This paper is a contribution to ILP (ERAs, Topo-Central Asia), IGCP 473 and IGCP 480.

References

 

DC FieldValueLanguage
dc.contributor.authorXiao, WJen_HK
dc.contributor.authorWindley, BFen_HK
dc.contributor.authorYuan, Cen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorHan, CMen_HK
dc.contributor.authorLin, SFen_HK
dc.contributor.authorLchen, HLen_HK
dc.contributor.authorYan, QRen_HK
dc.contributor.authorLiu, DYen_HK
dc.contributor.authorQin, KZen_HK
dc.contributor.authorLi, JLen_HK
dc.contributor.authorSun, Sen_HK
dc.date.accessioned2010-05-31T03:34:29Z-
dc.date.available2010-05-31T03:34:29Z-
dc.date.issued2009en_HK
dc.identifier.citationAmerican Journal Of Science, 2009, v. 309 n. 3, p. 221-270en_HK
dc.identifier.issn0002-9599en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58655-
dc.description.abstractThe formation and development of the southern Altaids is controversial with regard to its accretionary orogenesis and continental growth. The Altay-East Junggar orogenic collage of North Xinjiang, China, offers a special natural laboratory to resolve this puzzle. Three tectonic units were juxtaposed, roughly from North to South, in the study area. The northern part (Chinese Altay), composed of variably deformed and metamorphosed Paleozoic sedimentary, volcanic, and granitic rocks, is interpreted as a Japan-type island arc of Paleozoic to Carboniferous-Permian age. The central part (Erqis), which consists of ophiolitic mélanges and coherent assemblages, is a Paleozoic accretionary complex. The southern part (East Junggar), characterized by imbricated ophiolitic mélanges, Nb-enriched basalts, adakitic rocks and volcanic rocks, is regarded as a Devonian-Carboniferous intra-oceanic island arc with some Paleozoic ophiolites, superimposed by Permian arc volcanism. A plagiogranite from an imbricated ophiolitic mélange (Armantai) in the East Junggar yields a new SHRIMP zircon age of 503 ± 7 Ma. Using published age constraints, we propose the presence of multiple subduction systems in this part of the Paloasian Ocean in the Paleozoic. The intraoceanic arcs became accreted to the southern active margin of the Siberian craton in the middle Carboniferous-Permian. During the long accretionary processes, in addition to large-scale southward-directed thrusting, large-scale, orogen-parallel, strikeslip movements (for example, Erqis fault) in the Permian translated fragments of these intraoceanic arcs and associated accretionary wedges. This new tectonic model has broad implications for the architecture and crustal growth of Central Asia and for other ancient orogens.en_HK
dc.languageengen_HK
dc.publisherAmerican Journal of Science. The Journal's web site is located at http://www.ajsonline.orgen_HK
dc.relation.ispartofAmerican Journal of Scienceen_HK
dc.titlePaleozoic multiple subduction-accretion processes of the southern Altaidsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0002-9599&volume=309&spage=221&epage=270&date=2009&atitle=Paleozoic+multiple+subduction-accretion+processes+of+the+Southern+Altaids.+en_HK
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.2475/03.2009.02en_HK
dc.identifier.scopuseid_2-s2.0-65349153299en_HK
dc.identifier.hkuros161214en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-65349153299&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume309en_HK
dc.identifier.issue3en_HK
dc.identifier.spage221en_HK
dc.identifier.epage270en_HK
dc.identifier.isiWOS:000264541700002-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridXiao, WJ=7202456615en_HK
dc.identifier.scopusauthoridWindley, BF=7006726637en_HK
dc.identifier.scopusauthoridYuan, C=35241599200en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridHan, CM=35794513200en_HK
dc.identifier.scopusauthoridLin, SF=7407611598en_HK
dc.identifier.scopusauthoridLchen, HL=35285837000en_HK
dc.identifier.scopusauthoridYan, QR=8753192900en_HK
dc.identifier.scopusauthoridLiu, DY=7410099304en_HK
dc.identifier.scopusauthoridQin, KZ=22958330200en_HK
dc.identifier.scopusauthoridLi, JL=26643194200en_HK
dc.identifier.scopusauthoridSun, S=7404510143en_HK

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