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Article: Melting of newly formed mafic crust for the formation of Neoproterozoic I-type granite in the Hannan region, South China
Title | Melting of newly formed mafic crust for the formation of Neoproterozoic I-type granite in the Hannan region, South China | ||||||||
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Authors | |||||||||
Keywords | Color figures Tables | ||||||||
Issue Date | 2009 | ||||||||
Publisher | University of Chicago Press. The Journal's web site is located at http://www.journals.uchicago.edu/JG | ||||||||
Citation | Journal Of Geology, 2009, v. 117 n. 1, p. 54-70 How to Cite? | ||||||||
Abstract | Neoproterozoic magmatism in the Hannan region at the northwestern margin of the Yangtze Block is characterized by numerous felsic plutons associated with minor mafic-ultramafic intrusions. The felsic plutons are either adakitic or normal-arc granitic in composition. The adakitic plutons are ∼735 Ma in age and are interpreted as having formed by partial melting of a thickened lower mafic crust. Among the normal-arc-related felsic plutons, the Tianpinghe pluton is the largest and has a SHRIMP zircon U-Pb age of 762 ± 4 Ma, older than the adakitic plutons in the region. Rocks from the Tianpinghe pluton have relatively high SiO2 (67.1-70.1 wt%) and K2O+ Na 2O (7.8-8.6 wt%) and relatively low MgO (0.7-1.3 wt%) and Al 2O3 contents (14.5-15.6 wt%), with Al2O 3/(CaO + K2O + Na2O) (A/CNK) values ranging from 0.95 to 1.08. They have arc-affinity trace-element compositions that are characterized by enrichment of large-ion lithophile elements and depletion of high-field-strength elements (Nb, Ta), with strong positive Pb and negative Ti anomalies. They have a narrow range of εNd(t) values (+0.15 to - 1.76) and relatively high zircon eHf values (+0.6 to - 8.3). These geochemical features are typical of I-type granites. The rocks from the Tianpinghe pluton have relatively young single-stage and two-stage Hf model ages (1.01-1.31 and 1.31-2.01 Ga, respectively), suggesting that the pluton was generated by partial melting of newly formed basaltic rocks. On the basis of its arc-related geochemical affinity and its emplacement before voluminous adakitic magmatism but after mafic-ultramafic intrusions, the Tianpinghe pluton is considered to be Neoproterozoic arc granite formed during a period of crustal growth and reworking. Generation of the later adakitic plutons suggests that the crustal thickness increased to more than 50 km by mafic magma underplating. © 2009 by The University of Chicago. All rights reserved. | ||||||||
Persistent Identifier | http://hdl.handle.net/10722/58662 | ||||||||
ISSN | 2023 Impact Factor: 1.5 2023 SCImago Journal Rankings: 0.450 | ||||||||
ISI Accession Number ID |
Funding Information: This work was substantially supported by grants from the National Natural Science Foundation of China (40873027), the Chinese Academy of Science (2005), and a Chinese 973 project matching fund from the University of Hong Kong. We are grateful to Allen Kennedy for SHRIMP dating, Xiao Fu for x-ray fluorescence analyses, Gao Jian-Feng for ICP-MS analyses, and Liu He and Zhao Xin-Fu for zircon Lu-Hf analyses. Cheng Wei is also thanked for his assistance in the field. | ||||||||
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Zhao, JH | en_HK |
dc.contributor.author | Zhou, MF | en_HK |
dc.date.accessioned | 2010-05-31T03:34:36Z | - |
dc.date.available | 2010-05-31T03:34:36Z | - |
dc.date.issued | 2009 | en_HK |
dc.identifier.citation | Journal Of Geology, 2009, v. 117 n. 1, p. 54-70 | en_HK |
dc.identifier.issn | 0022-1376 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/58662 | - |
dc.description.abstract | Neoproterozoic magmatism in the Hannan region at the northwestern margin of the Yangtze Block is characterized by numerous felsic plutons associated with minor mafic-ultramafic intrusions. The felsic plutons are either adakitic or normal-arc granitic in composition. The adakitic plutons are ∼735 Ma in age and are interpreted as having formed by partial melting of a thickened lower mafic crust. Among the normal-arc-related felsic plutons, the Tianpinghe pluton is the largest and has a SHRIMP zircon U-Pb age of 762 ± 4 Ma, older than the adakitic plutons in the region. Rocks from the Tianpinghe pluton have relatively high SiO2 (67.1-70.1 wt%) and K2O+ Na 2O (7.8-8.6 wt%) and relatively low MgO (0.7-1.3 wt%) and Al 2O3 contents (14.5-15.6 wt%), with Al2O 3/(CaO + K2O + Na2O) (A/CNK) values ranging from 0.95 to 1.08. They have arc-affinity trace-element compositions that are characterized by enrichment of large-ion lithophile elements and depletion of high-field-strength elements (Nb, Ta), with strong positive Pb and negative Ti anomalies. They have a narrow range of εNd(t) values (+0.15 to - 1.76) and relatively high zircon eHf values (+0.6 to - 8.3). These geochemical features are typical of I-type granites. The rocks from the Tianpinghe pluton have relatively young single-stage and two-stage Hf model ages (1.01-1.31 and 1.31-2.01 Ga, respectively), suggesting that the pluton was generated by partial melting of newly formed basaltic rocks. On the basis of its arc-related geochemical affinity and its emplacement before voluminous adakitic magmatism but after mafic-ultramafic intrusions, the Tianpinghe pluton is considered to be Neoproterozoic arc granite formed during a period of crustal growth and reworking. Generation of the later adakitic plutons suggests that the crustal thickness increased to more than 50 km by mafic magma underplating. © 2009 by The University of Chicago. All rights reserved. | en_HK |
dc.language | eng | en_HK |
dc.publisher | University of Chicago Press. The Journal's web site is located at http://www.journals.uchicago.edu/JG | en_HK |
dc.relation.ispartof | Journal of Geology | en_HK |
dc.subject | Color figures | - |
dc.subject | Tables | - |
dc.title | Melting of newly formed mafic crust for the formation of Neoproterozoic I-type granite in the Hannan region, South China | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0022-1376&volume=117&issue=1&spage=54&epage=70&date=2009&atitle=Melting+of+Newly+Formed+Mafic+Crust+for+the+Formation+of+Neoproterozoic+I-Type+Granite+in+the+Hannan+Region,+South+China | en_HK |
dc.identifier.email | Zhou, MF:mfzhou@hkucc.hku.hk | en_HK |
dc.identifier.authority | Zhou, MF=rp00844 | en_HK |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1086/593321 | en_HK |
dc.identifier.scopus | eid_2-s2.0-61849147827 | en_HK |
dc.identifier.hkuros | 167320 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-61849147827&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 117 | en_HK |
dc.identifier.issue | 1 | en_HK |
dc.identifier.spage | 54 | en_HK |
dc.identifier.epage | 70 | en_HK |
dc.identifier.isi | WOS:000263061900005 | - |
dc.publisher.place | United States | en_HK |
dc.identifier.scopusauthorid | Zhao, JH=11140043500 | en_HK |
dc.identifier.scopusauthorid | Zhou, MF=7403506005 | en_HK |
dc.identifier.citeulike | 4005422 | - |
dc.identifier.issnl | 0022-1376 | - |