File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Late Cretaceous charnockite with adakitic affinities from the Gangdese batholith, southeastern Tibet: Evidence for Neo-Tethyan mid-ocean ridge subduction?

TitleLate Cretaceous charnockite with adakitic affinities from the Gangdese batholith, southeastern Tibet: Evidence for Neo-Tethyan mid-ocean ridge subduction?
Authors
KeywordsCharnockite
Geochronology
Neo-Tethyan ridge subduction
Petrology
Tibet
Issue Date2010
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcr
Citation
Gondwana Research, 2010, v. 17 n. 4, p. 615-631 How to Cite?
AbstractThe Gangdese batholith emplaced during the time span of Cretaceous to Neogene in the southern Lhasa terrane of Tibet has been considered as a major constituent of an Andean-type convergent margin derived from the northward subduction of the Neo-Tethyan oceanic lithosphere under Asia. Whereas previous studies assigned the Gangdese granitoids to be comprised predominantly of calc-alkaline rocks, here we report a suite of charnockites from the eastern part of the belt and characterize their petrology, geochemistry and age. These rocks possess an assemblage of andesine, enstatite, diopside, calcic amphibole, Ti-rich biotite, quartz and minor K-feldspar. Geochemically, they are characterized by intermediate SiO 2 (54-63 wt.%), relatively high Al 2O 3 (15.9-18.9 wt.%), REE (55.7-89.4 ppm) and Sr (419.6-619.4 ppm), and low Y (11.3-17.2 ppm) and Yb (1.2-1.8 ppm) concentrations. The rocks display geochemical affinities similar to those of adakites derived from the partial melting of a subducted slab, and also can be compared to magnesian charnockites formed within a continental magmatic arc. The crystallization conditions of the charnockites were estimated at 900 °C and 1.0 GPa. LA-ICP-MS zircon U-Pb analyses of eleven samples yield consistent 206Pb/ 238U weighted mean ages of 86 to 90 Ma, indicating that the charnockites were emplaced in the Late Cretaceous. Considering the coeval calc-alkaline magmatism and high-temperature granulite-facies metamorphism, we propose that such high-temperature and low-H 2O activity charnockites were derived through Neo-Tethyan mid-ocean ridge subduction before the collision of India with the Asian continent. © 2009 International Association for Gondwana Research.
Persistent Identifierhttp://hdl.handle.net/10722/123865
ISSN
2015 Impact Factor: 8.743
2015 SCImago Journal Rankings: 4.949
ISI Accession Number ID
Funding AgencyGrant Number
China Geological Survey Program1212010918012
Chinese NSFC40772049
40972055
Foundation for Open Projects of State Key Laboratory of Geological Processes and Mineral Resources, China University of GeosciencesGPMR200907
Funding Information:

Zeming Zhang thanks Profs. Zhiqin Xu, Zhenmin Jin, Jingshui Yang, Weidong Sun, Qiang Wang, Lailin Zheng, Quanru Geng, Linsheng Zheng, Xunxiang Qi and Yongsheng Liu for their valuable directions and discussions in the work. Master students Feng Liu, Fei Yu and Wei Wang took part working in the fieldwork during this study. We are most grateful to Profs. H.M. Rajesh, Wenjiao Xiao and an anonymous reviewer for critical and constructive reviews of the manuscript. This research was funded by the China Geological Survey Program (1212010918012), Chinese NSFC Grants (40772049 and 40972055) and the Foundation for Open Projects of State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (GPMR200907).

References

 

DC FieldValueLanguage
dc.contributor.authorZhang, Zen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorSantosh, Men_HK
dc.contributor.authorWang, Jen_HK
dc.contributor.authorDong, Xen_HK
dc.contributor.authorShen, Ken_HK
dc.date.accessioned2010-10-06T06:21:07Z-
dc.date.available2010-10-06T06:21:07Z-
dc.date.issued2010en_HK
dc.identifier.citationGondwana Research, 2010, v. 17 n. 4, p. 615-631en_HK
dc.identifier.issn1342-937Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/123865-
dc.description.abstractThe Gangdese batholith emplaced during the time span of Cretaceous to Neogene in the southern Lhasa terrane of Tibet has been considered as a major constituent of an Andean-type convergent margin derived from the northward subduction of the Neo-Tethyan oceanic lithosphere under Asia. Whereas previous studies assigned the Gangdese granitoids to be comprised predominantly of calc-alkaline rocks, here we report a suite of charnockites from the eastern part of the belt and characterize their petrology, geochemistry and age. These rocks possess an assemblage of andesine, enstatite, diopside, calcic amphibole, Ti-rich biotite, quartz and minor K-feldspar. Geochemically, they are characterized by intermediate SiO 2 (54-63 wt.%), relatively high Al 2O 3 (15.9-18.9 wt.%), REE (55.7-89.4 ppm) and Sr (419.6-619.4 ppm), and low Y (11.3-17.2 ppm) and Yb (1.2-1.8 ppm) concentrations. The rocks display geochemical affinities similar to those of adakites derived from the partial melting of a subducted slab, and also can be compared to magnesian charnockites formed within a continental magmatic arc. The crystallization conditions of the charnockites were estimated at 900 °C and 1.0 GPa. LA-ICP-MS zircon U-Pb analyses of eleven samples yield consistent 206Pb/ 238U weighted mean ages of 86 to 90 Ma, indicating that the charnockites were emplaced in the Late Cretaceous. Considering the coeval calc-alkaline magmatism and high-temperature granulite-facies metamorphism, we propose that such high-temperature and low-H 2O activity charnockites were derived through Neo-Tethyan mid-ocean ridge subduction before the collision of India with the Asian continent. © 2009 International Association for Gondwana Research.en_HK
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcren_HK
dc.relation.ispartofGondwana Researchen_HK
dc.rightsGondwana Research. Copyright © Elsevier BV.-
dc.subjectCharnockiteen_HK
dc.subjectGeochronologyen_HK
dc.subjectNeo-Tethyan ridge subductionen_HK
dc.subjectPetrologyen_HK
dc.subjectTibeten_HK
dc.titleLate Cretaceous charnockite with adakitic affinities from the Gangdese batholith, southeastern Tibet: Evidence for Neo-Tethyan mid-ocean ridge subduction?en_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1342-937X&volume=17&issue=4&spage=615&epage=631&date=2010&atitle=Late+Cretaceous+charnockite+with+adakitic+affinities+from+the+Gangdese+batholith,+southeastern+Tibet:+evidence+for+Neo-Tethyan+mid-ocean+ridge+subduction?+-
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.gr.2009.10.007en_HK
dc.identifier.scopuseid_2-s2.0-77349102023en_HK
dc.identifier.hkuros175407-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77349102023&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume17en_HK
dc.identifier.issue4en_HK
dc.identifier.spage615en_HK
dc.identifier.epage631en_HK
dc.identifier.isiWOS:000276675700001-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridZhang, Z=35335666400en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridSantosh, M=7005398812en_HK
dc.identifier.scopusauthoridWang, J=49061574500en_HK
dc.identifier.scopusauthoridDong, X=38961300600en_HK
dc.identifier.scopusauthoridShen, K=8956606700en_HK

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats