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Article: Early Permian seafloor to continental arc magmatism in the eastern Paleo-Tethys: U-Pb age and Nd-Sr isotope data from the southern Lancangjiang zone, Yunnan, China

TitleEarly Permian seafloor to continental arc magmatism in the eastern Paleo-Tethys: U-Pb age and Nd-Sr isotope data from the southern Lancangjiang zone, Yunnan, China
Authors
KeywordsChina
Lancangjiang zone
Lincang granite
Paleo-Tethys
U-Pb geochronology
Yunnan
Issue Date2009
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2009, v. 113 n. 3-4, p. 408-422 How to Cite?
AbstractSouthwestern Yunnan is a key region for the understanding of the complex geological evolution of the Paleo-Tethys and the Eurasia-Gondwana collision at the end of the Paleozoic. The southern Lancangjiang zone near the city of Jinghong at the Laotian border hosts MORB-like basaltic andesites and gabbros (Nanlianshan volcano-plutonic complex). Fine-grained gabbro with a U-Pb zircon age of 292 ± 1 Ma and ε Nd(t) of 5.3 is indicative of early Permian sea-floor spreading. The Jinghong area also hosts small granodiorite intrusions which have U-Pb zircon ages of 284 ± 1 Ma to 282 ± 1 Ma, ε Nd(t) of - 3.1 to - 3.6, and initial Sr isotopic ratios of 0.709-0.710. The chemical and isotope signature of the granodiorite is characteristic for an arc setting and is similar to arc-like andesites from the same area. Both the earlier MORB-type magmatism and the granodiorite intrusions can be correlated in time and composition with ophiolites and trondhjemites several 100 km north and point to Permian subduction of oceanic crust between the Lincang Block and the Lanping-Simao Block. The regionally distributed peraluminous Triassic Lincang granite batholith marks the closure of the Paleo-Tethys. The northern Lincang granite gave a zircon U-Pb age of 239 ± 1 Ma, similar to the Baimaxueshan granodioritic intrusion about 250 km north of the Lincang granite, which likely represents the northward extension of the Lincang granite. Nd-model ages range from 1.7 to 2.1 Ga and point to Paleoproterozoic basement which probably represents a fragment of the Yangtze Block. Our data suggest a complex Permo-Triassic history of continental rifting, subduction and collision at the southern border of the Yangtze Block. © 2009 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/124654
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
Funding AgencyGrant Number
Bundesanstalt fur Geowissenschaften und Rohstoffe (BGR), Germany
Funding Information:

This study was supported by Bundesanstalt fur Geowissenschaften und Rohstoffe (BGR), Germany. We thank particularly Dr Thomas Oberthur. We thank Dr Christina Yan Wang and an anonymous reviewer for their constructive comments on the manuscript.

References

 

DC FieldValueLanguage
dc.contributor.authorHennig, Den_HK
dc.contributor.authorLehmann, Ben_HK
dc.contributor.authorFrei, Den_HK
dc.contributor.authorBelyatsky, Ben_HK
dc.contributor.authorZhao, XFen_HK
dc.contributor.authorCabral, ARen_HK
dc.contributor.authorZeng, PSen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorSchmidt, Ken_HK
dc.date.accessioned2010-10-31T10:46:39Z-
dc.date.available2010-10-31T10:46:39Z-
dc.date.issued2009en_HK
dc.identifier.citationLithos, 2009, v. 113 n. 3-4, p. 408-422en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/124654-
dc.description.abstractSouthwestern Yunnan is a key region for the understanding of the complex geological evolution of the Paleo-Tethys and the Eurasia-Gondwana collision at the end of the Paleozoic. The southern Lancangjiang zone near the city of Jinghong at the Laotian border hosts MORB-like basaltic andesites and gabbros (Nanlianshan volcano-plutonic complex). Fine-grained gabbro with a U-Pb zircon age of 292 ± 1 Ma and ε Nd(t) of 5.3 is indicative of early Permian sea-floor spreading. The Jinghong area also hosts small granodiorite intrusions which have U-Pb zircon ages of 284 ± 1 Ma to 282 ± 1 Ma, ε Nd(t) of - 3.1 to - 3.6, and initial Sr isotopic ratios of 0.709-0.710. The chemical and isotope signature of the granodiorite is characteristic for an arc setting and is similar to arc-like andesites from the same area. Both the earlier MORB-type magmatism and the granodiorite intrusions can be correlated in time and composition with ophiolites and trondhjemites several 100 km north and point to Permian subduction of oceanic crust between the Lincang Block and the Lanping-Simao Block. The regionally distributed peraluminous Triassic Lincang granite batholith marks the closure of the Paleo-Tethys. The northern Lincang granite gave a zircon U-Pb age of 239 ± 1 Ma, similar to the Baimaxueshan granodioritic intrusion about 250 km north of the Lincang granite, which likely represents the northward extension of the Lincang granite. Nd-model ages range from 1.7 to 2.1 Ga and point to Paleoproterozoic basement which probably represents a fragment of the Yangtze Block. Our data suggest a complex Permo-Triassic history of continental rifting, subduction and collision at the southern border of the Yangtze Block. © 2009 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_HK
dc.relation.ispartofLithosen_HK
dc.subjectChinaen_HK
dc.subjectLancangjiang zoneen_HK
dc.subjectLincang graniteen_HK
dc.subjectPaleo-Tethysen_HK
dc.subjectU-Pb geochronologyen_HK
dc.subjectYunnanen_HK
dc.titleEarly Permian seafloor to continental arc magmatism in the eastern Paleo-Tethys: U-Pb age and Nd-Sr isotope data from the southern Lancangjiang zone, Yunnan, Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-4937&volume=113&issue=3-4&spage=408&epage=422&date=2009&atitle=Early+Permian+seafloor+to+continental+arc+magmatism+in+the+eastern+Paleo-Tethys:+U-Pb+age+and+Nd-Sr+isotope+data+from+the+southern+Lancangjiang+zone,+Yunnan,+Chinaen_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.lithos.2009.04.031en_HK
dc.identifier.scopuseid_2-s2.0-70449120540en_HK
dc.identifier.hkuros181669en_HK
dc.identifier.hkuros177729-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-70449120540&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume113en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage408en_HK
dc.identifier.epage422en_HK
dc.identifier.isiWOS:000272787200004-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridHennig, D=24171204100en_HK
dc.identifier.scopusauthoridLehmann, B=7102853780en_HK
dc.identifier.scopusauthoridFrei, D=8651924800en_HK
dc.identifier.scopusauthoridBelyatsky, B=8977408200en_HK
dc.identifier.scopusauthoridZhao, XF=49261273800en_HK
dc.identifier.scopusauthoridCabral, AR=35610209600en_HK
dc.identifier.scopusauthoridZeng, PS=9940835300en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridSchmidt, K=49261233900en_HK
dc.identifier.citeulike4868362-

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