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Article: Arc-like volcanic rocks from the southern Lancangjiang zone, SW China: Geochronological and geochemical constraints on their petrogenesis and tectonic implications

TitleArc-like volcanic rocks from the southern Lancangjiang zone, SW China: Geochronological and geochemical constraints on their petrogenesis and tectonic implications
Authors
KeywordsArc Volcanic Rocks
Middle Triassic
Paleo-Tethys
Shrimp U-Pb Zircon Dating
Southern Lancangjiang Zone
Issue Date2008
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2008, v. 102 n. 1-2, p. 358-373 How to Cite?
AbstractTriassic volcanic rocks are mainly distributed in the central part of the San-Jiang orogenic belt in southwestern China, and are exposed dominantly in the eastern segment of the Lancangjiang zone. Interpreted as the products of subduction during closure of the paleo-Tethyan Ocean, these volcanic rocks are important for reconstructions of the evolution of the paleo-Tethyan Ocean in southwestern China. Petrologically, the Triassic volcanic rocks in the zone are dominated by andesites with minor basaltic andesites. An andesite sample yielded a SHRIMP U-Pb zircon age of 248.5 ± 6.3 Ma, suggesting that these volcanic rocks erupted in the Early Triassic and not the Middle Triassic as previously assumed. Geochemically, these volcanic rocks have enrichments in LILE and LREE and depletions in HFSEs, significantly similar to typical subduction-related arc volcanic rocks. They are also characterized by relatively high Al 2O 3 contents and radiogenic Sr-Pb isotopic compositions, indicating that their mantle source could have experienced the modification of subducted sediments and slightly fluid/melt metasomatism from subducted pelagic sediments. The results of mixing calculations further confirm that the mantle source of the Early Triassic volcanic rocks in the area could have been predominantly modified by involvement of 5-7% subducted pelagic sediments into an Indian MORB-like mantle source. Associated with large volumes of Middle-Triassic (∼ 230 Ma) syn-collision granites in the region, these volcanic rocks in the southern Lancangjiang zone, southwestern China, are considered to have developed in a continental margin volcanic arc setting during Early Triassic time, which suggests that the paleo-Tethyan Ocean had not been closed until Middle Triassic when the continent-continent or continent-arc collision occurred. © 2007 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151239
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorPeng, Ten_US
dc.contributor.authorWang, Yen_US
dc.contributor.authorZhao, Gen_US
dc.contributor.authorFan, Wen_US
dc.contributor.authorPeng, Ben_US
dc.date.accessioned2012-06-26T06:19:08Z-
dc.date.available2012-06-26T06:19:08Z-
dc.date.issued2008en_US
dc.identifier.citationLithos, 2008, v. 102 n. 1-2, p. 358-373en_US
dc.identifier.issn0024-4937en_US
dc.identifier.urihttp://hdl.handle.net/10722/151239-
dc.description.abstractTriassic volcanic rocks are mainly distributed in the central part of the San-Jiang orogenic belt in southwestern China, and are exposed dominantly in the eastern segment of the Lancangjiang zone. Interpreted as the products of subduction during closure of the paleo-Tethyan Ocean, these volcanic rocks are important for reconstructions of the evolution of the paleo-Tethyan Ocean in southwestern China. Petrologically, the Triassic volcanic rocks in the zone are dominated by andesites with minor basaltic andesites. An andesite sample yielded a SHRIMP U-Pb zircon age of 248.5 ± 6.3 Ma, suggesting that these volcanic rocks erupted in the Early Triassic and not the Middle Triassic as previously assumed. Geochemically, these volcanic rocks have enrichments in LILE and LREE and depletions in HFSEs, significantly similar to typical subduction-related arc volcanic rocks. They are also characterized by relatively high Al 2O 3 contents and radiogenic Sr-Pb isotopic compositions, indicating that their mantle source could have experienced the modification of subducted sediments and slightly fluid/melt metasomatism from subducted pelagic sediments. The results of mixing calculations further confirm that the mantle source of the Early Triassic volcanic rocks in the area could have been predominantly modified by involvement of 5-7% subducted pelagic sediments into an Indian MORB-like mantle source. Associated with large volumes of Middle-Triassic (∼ 230 Ma) syn-collision granites in the region, these volcanic rocks in the southern Lancangjiang zone, southwestern China, are considered to have developed in a continental margin volcanic arc setting during Early Triassic time, which suggests that the paleo-Tethyan Ocean had not been closed until Middle Triassic when the continent-continent or continent-arc collision occurred. © 2007 Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_US
dc.relation.ispartofLithosen_US
dc.rightsLithos. Copyright © Elsevier BV.-
dc.subjectArc Volcanic Rocksen_US
dc.subjectMiddle Triassicen_US
dc.subjectPaleo-Tethysen_US
dc.subjectShrimp U-Pb Zircon Datingen_US
dc.subjectSouthern Lancangjiang Zoneen_US
dc.titleArc-like volcanic rocks from the southern Lancangjiang zone, SW China: Geochronological and geochemical constraints on their petrogenesis and tectonic implicationsen_US
dc.typeArticleen_US
dc.identifier.emailPeng, T: tppeng@gig.al.cnen_US
dc.identifier.emailWang, Y: yjwang@gig.ac.cn-
dc.identifier.emailZhao, G: gzhao@hkucc.hku.hk-
dc.identifier.authorityZhao, G=rp00842en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.lithos.2007.08.012en_US
dc.identifier.scopuseid_2-s2.0-41449119055en_US
dc.identifier.hkuros144311-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-41449119055&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume102en_US
dc.identifier.issue1-2en_US
dc.identifier.spage358en_US
dc.identifier.epage373en_US
dc.identifier.isiWOS:000255605500020-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridPeng, T=7201447871en_US
dc.identifier.scopusauthoridWang, Y=36496272800en_US
dc.identifier.scopusauthoridZhao, G=7403296321en_US
dc.identifier.scopusauthoridFan, W=7401635313en_US
dc.identifier.scopusauthoridPeng, B=49261231300en_US

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