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Article: Geochronology and geochemistry of the c. 80 Ma Rutog granitic pluton, northwestern Tibet: Implications for the tectonic evolution of the Lhasa Terrane

TitleGeochronology and geochemistry of the c. 80 Ma Rutog granitic pluton, northwestern Tibet: Implications for the tectonic evolution of the Lhasa Terrane
Authors
KeywordsGangdese magmatic arc
I-type granite
Late Cretaceous
Lhasa Terrane
Rutog
Issue Date2008
PublisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=GEO
Citation
Geological Magazine, 2008, v. 145 n. 6, p. 845-857 How to Cite?
AbstractThe Rutog granitic pluton lies in the Gangdese magmatic arc in the westernmost part of the Lhasa Terrane, NW Tibet, and has SHRIMP zircon U-Pb ages of c. 80 Ma. The pluton consists of granodiorite and monzogranite with SiO2 ranging from 62 to 72 wt% and Al2 O3 from 15 to 17 wt%. The rocks contain 2.33-4.93 wt% K2O and 3.42-5.52 wt% Na2O and have Na2O/K2O ratios of 0.74-2.00. Their chondrite-normalized rare earth element (REE) patterns are enriched in LREE ((La/Yb)n = 15 to 26) and do not show significant Eu anomalies (αEu = 0.68-1.15). On a primitive mantle-normalized trace element diagram, the rocks are rich in large ion lithophile elements (LILE) and poor in high field strength elements (HFSE), HREE and Y. Their Sr/Y ratios range from 15 to 78 with an average of 30. The rocks have constant initial 87Sr/86Sr ratios (0.7045 to 0.7049) and slightly positive εNd(t) values (+0.1 to +2.3), similar to I-type granites generated in an arc setting. The geochemistry of the Rutog pluton is best explained by partial melting of a thickened continental crust, triggered by underplating of basaltic magmas in a mantle wedge. The formation of the Rutog pluton suggests flat subduction of the Neo-Tethyan oceanic lithosphere from the south. Crustal thickening may have occurred in the Late Cretaceous prior to the India-Asia collision. © Cambridge University Press 2008.
Persistent Identifierhttp://hdl.handle.net/10722/57267
ISSN
2015 Impact Factor: 1.863
2015 SCImago Journal Rankings: 1.119
ISI Accession Number ID
Funding AgencyGrant Number
CAS Hundred Talents Project
Funding Information:

This work was supported by the CAS Hundred Talents Project (to ZKJ). The authors thank Ms Tao Hua for her assistance with the zircon SHRIMP U-Pb isotope analyses and Xu Yong-Hang for his help with the XRF and ICP-MS analyses. Zhang Yuxiu and Zhong Lifeng assisted with the field work. We thank Prof. Nick T. Arndt, Prof. Paul T. Robinson, and Dr Christina Y. Wang for their comments that helped to improve an early version of this paper. We also thank Dr Mark Allen and Mrs Jane Holland for their editorial work.

References

 

DC FieldValueLanguage
dc.contributor.authorZhao, TPen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorZhao, JHen_HK
dc.contributor.authorZhang, KJen_HK
dc.contributor.authorChen, Wen_HK
dc.date.accessioned2010-04-12T01:31:19Z-
dc.date.available2010-04-12T01:31:19Z-
dc.date.issued2008en_HK
dc.identifier.citationGeological Magazine, 2008, v. 145 n. 6, p. 845-857en_HK
dc.identifier.issn0016-7568en_HK
dc.identifier.urihttp://hdl.handle.net/10722/57267-
dc.description.abstractThe Rutog granitic pluton lies in the Gangdese magmatic arc in the westernmost part of the Lhasa Terrane, NW Tibet, and has SHRIMP zircon U-Pb ages of c. 80 Ma. The pluton consists of granodiorite and monzogranite with SiO2 ranging from 62 to 72 wt% and Al2 O3 from 15 to 17 wt%. The rocks contain 2.33-4.93 wt% K2O and 3.42-5.52 wt% Na2O and have Na2O/K2O ratios of 0.74-2.00. Their chondrite-normalized rare earth element (REE) patterns are enriched in LREE ((La/Yb)n = 15 to 26) and do not show significant Eu anomalies (αEu = 0.68-1.15). On a primitive mantle-normalized trace element diagram, the rocks are rich in large ion lithophile elements (LILE) and poor in high field strength elements (HFSE), HREE and Y. Their Sr/Y ratios range from 15 to 78 with an average of 30. The rocks have constant initial 87Sr/86Sr ratios (0.7045 to 0.7049) and slightly positive εNd(t) values (+0.1 to +2.3), similar to I-type granites generated in an arc setting. The geochemistry of the Rutog pluton is best explained by partial melting of a thickened continental crust, triggered by underplating of basaltic magmas in a mantle wedge. The formation of the Rutog pluton suggests flat subduction of the Neo-Tethyan oceanic lithosphere from the south. Crustal thickening may have occurred in the Late Cretaceous prior to the India-Asia collision. © Cambridge University Press 2008.en_HK
dc.languageengen_HK
dc.publisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=GEOen_HK
dc.relation.ispartofGeological Magazineen_HK
dc.rightsGeological Magazine. Copyright © Cambridge University Press.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectGangdese magmatic arcen_HK
dc.subjectI-type graniteen_HK
dc.subjectLate Cretaceousen_HK
dc.subjectLhasa Terraneen_HK
dc.subjectRutogen_HK
dc.titleGeochronology and geochemistry of the c. 80 Ma Rutog granitic pluton, northwestern Tibet: Implications for the tectonic evolution of the Lhasa Terraneen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0016-7568&volume=145&issue=6&spage=845&epage=857&date=2008&atitle=Geochronology+and+geochemistry+of+the+c.+80+Ma+Rutog+granitic+pluton,+northwestern+Tibet:+implications+for+the+tectonic+evolution+of+the+Lhasa+Terraneen_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1017/S0016756808005025en_HK
dc.identifier.scopuseid_2-s2.0-53949091411en_HK
dc.identifier.hkuros153189-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-53949091411&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume145en_HK
dc.identifier.issue6en_HK
dc.identifier.spage845en_HK
dc.identifier.epage857en_HK
dc.identifier.isiWOS:000260918600008-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridZhao, TP=7402268400en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridZhao, JH=11140043500en_HK
dc.identifier.scopusauthoridZhang, KJ=7404451308en_HK
dc.identifier.scopusauthoridChen, W=36012338300en_HK

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