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Article: Neoproterozoic adakitic plutons and arc magmatism along the western margin of the Yangtze Block, South China

TitleNeoproterozoic adakitic plutons and arc magmatism along the western margin of the Yangtze Block, South China
Authors
KeywordsEarth sciences
Geology
Issue Date2007
PublisherUniversity of Chicago Press. The Journal's web site is located at http://www.journals.uchicago.edu/JG
Citation
Journal Of Geology, 2007, v. 115 n. 6, p. 675-689 How to Cite?
AbstractNeoproterozoic adakitic plutons that crop out along the western margin of the Yangtze Block (South China) from Kangding on the north to Panxi on the south provide constraints on the origin of the giant Jinningian magmatic event of South China. Representative plutons include the Xuelongbao (750 Ma), Datian (760 Ma), and Dajianshan intrusions. The latter two bodies consist mainly of granodiorite with relatively high SiO2 (51.0-73.4 wt%) and Mg#'s (0.36-0.55). They have fractionated rare earth element patterns, with (La/Yb)N ratios ranging from 2.6 to 101.8, and are characterized by high Sr (344-1018 ppm) and low Y (4.3-17.9 ppm), yielding Sr/Y ratios ranging from 27 to 111. On primitive mantle-normalized trace-element diagrams, these rocks show enrichment of large-ion lithophile elements and depletion of high-field-strength elements (Nb, Ta), with positive Zr-Hf and negative Ti anomalies, consistent with an arc-related setting. They have relatively constant initial whole-rock 87Sr/86Sr ratios (0.704308-0.705068) and εNd values (+0.66 to -0.92). From their geochemistry, these plutons are interpreted to have formed in an arc environment. The parental magmas were generated from partial melts of a subducted oceanic slab that were modified by interaction with the overlying mantle wedge. Therefore, we conclude that the western margin of the Yangtze Block was an active magmatic arc during the Neoproterozoic. © 2007 by The University of Chicago. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/57266
ISSN
2015 Impact Factor: 2.58
2015 SCImago Journal Rankings: 1.344
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhao, JHen_HK
dc.contributor.authorZhou, MFen_HK
dc.date.accessioned2010-04-12T01:31:18Z-
dc.date.available2010-04-12T01:31:18Z-
dc.date.issued2007en_HK
dc.identifier.citationJournal Of Geology, 2007, v. 115 n. 6, p. 675-689en_HK
dc.identifier.issn0022-1376en_HK
dc.identifier.urihttp://hdl.handle.net/10722/57266-
dc.description.abstractNeoproterozoic adakitic plutons that crop out along the western margin of the Yangtze Block (South China) from Kangding on the north to Panxi on the south provide constraints on the origin of the giant Jinningian magmatic event of South China. Representative plutons include the Xuelongbao (750 Ma), Datian (760 Ma), and Dajianshan intrusions. The latter two bodies consist mainly of granodiorite with relatively high SiO2 (51.0-73.4 wt%) and Mg#'s (0.36-0.55). They have fractionated rare earth element patterns, with (La/Yb)N ratios ranging from 2.6 to 101.8, and are characterized by high Sr (344-1018 ppm) and low Y (4.3-17.9 ppm), yielding Sr/Y ratios ranging from 27 to 111. On primitive mantle-normalized trace-element diagrams, these rocks show enrichment of large-ion lithophile elements and depletion of high-field-strength elements (Nb, Ta), with positive Zr-Hf and negative Ti anomalies, consistent with an arc-related setting. They have relatively constant initial whole-rock 87Sr/86Sr ratios (0.704308-0.705068) and εNd values (+0.66 to -0.92). From their geochemistry, these plutons are interpreted to have formed in an arc environment. The parental magmas were generated from partial melts of a subducted oceanic slab that were modified by interaction with the overlying mantle wedge. Therefore, we conclude that the western margin of the Yangtze Block was an active magmatic arc during the Neoproterozoic. © 2007 by The University of Chicago. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherUniversity of Chicago Press. The Journal's web site is located at http://www.journals.uchicago.edu/JGen_HK
dc.relation.ispartofJournal of Geologyen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsThe Journal of Geology. Copyright © University of Chicago Press.en_HK
dc.subjectEarth sciencesen_HK
dc.subjectGeologyen_HK
dc.titleNeoproterozoic adakitic plutons and arc magmatism along the western margin of the Yangtze Block, South Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0022-1376&volume=115&issue=6&spage=675&epage=689&date=2007&atitle=Neoproterozoic+adakitic+plutons+and+arc+magmatism+along+the+western+margin+of+the+Yangtze+Block,+South+Chinaen_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.doi10.1086/521610en_HK
dc.identifier.scopuseid_2-s2.0-35348849717en_HK
dc.identifier.hkuros144263-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-35348849717&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume115en_HK
dc.identifier.issue6en_HK
dc.identifier.spage675en_HK
dc.identifier.epage689en_HK
dc.identifier.isiWOS:000249923500005-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridZhao, JH=11140043500en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK

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