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Article: Secular evolution of the Neoproterozoic lithospheric mantle underneath the northern margin of the Yangtze Block, South China

TitleSecular evolution of the Neoproterozoic lithospheric mantle underneath the northern margin of the Yangtze Block, South China
Authors
KeywordsMafic-ultramafic intrusions
Mantle evolution
Neoproterozoic
Petrogenesis
South China
Yangtze Block
Issue Date2009
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2009, v. 107 n. 3-4, p. 152-168 How to Cite?
AbstractThe 820-Ma Wangjiangshan, 814-Ma Beiba, 780-Ma Bijigou and 746-Ma Luojiaba mafic-ultramafic intrusions in the Hannan region of the northern margin of the Yangtze Block, South China, are used to constrain the secular evolution of the lithospheric mantle. These intrusions are mainly composed of gabbros, but the Beiba and Wangjiangshan intrusions also contain diorite. Rocks from these four intrusions have arc-like geochemical characteristics with high Ba/Nb (13-733), Ba/La (2-150), Sr/Nb (28-2320), Pb/Nb (0.2-13) and Ba/Th (107-7150) ratios relative to the primitive mantle. The Bijigou and Wangjiangshan intrusions have relatively constant initial 87Sr/86Sr ratios (0.703267 to 0.703729) and εNd(t) values (+ 2.95 to + 3.87). The Luojiaba intrusion has initial 87Sr/86Sr ratios (0.703690 to 0.703914) and εNd values (+ 0.93 to + 1.34) similar to those of the Beiba intrusion (87Sr/86Sr = 0.703768 to 0.704586; εNd = + 0.23 to + 1.98). The average zircon εHf values of the Bijigou and Wangjiangshan intrusions (+ 7.38 to + 9.58) are higher than those of the Luojiaba (+ 5.73) and Beiba intrusions (+ 4.76). The Wangjiangshan, Bijigou and Luojiaba intrusions do not show crustal contamination, whereas the Beiba intrusion shows evidence of crustal contamination. Modeling calculations reveal that the Wangjiangshan, Luojiaba and Beiba intrusions were produced by partial melting of garnet-spinel lherzolite to spinel lherzolite mantle, whereas the Bijigou intrusion was derived from a garnet lherzolite to garnet-spinel lherzolite mantle source. The arc-related geochemistry of these intrusions suggests that the lithospheric mantle sources were modified by slab fluids. The Luojiaba intrusion with high Th and high-field-strength-elements (HFSE) was derived from a mantle source enriched by sediment melts. Combined with 950 Ma arc volcanic rocks in the region, these intrusions support a model in which the lithospheric mantle beneath the northern margin of the Yangtze Block was enriched by slab-derived fluids since 950 Ma, and then depleted by melt extraction at ∼ 780 Ma, eventually further enriched by slab-derived melts at ∼ 746 Ma. © 2008 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/58681
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
Funding AgencyGrant Number
Chinese Academy of Science2007CR411401
National Nature Science Foundation of China40873027
Chinese Education IIIB07011
Funding Information:

This work was substantially supported by Chinese 973 Project (2007CR411401), Chinese Academy of Science (2005-2-21), National Nature Science Foundation of China (40873027) and Chinese Education Ill project (No. B07011). We are grateful to Allen Kennedy for SHRIMP dating, Xiao Fu for XRF analyses, Gao Jian-Feng for ICP-MS analyses, Zhao Xin-Fu for zircon Hf isotope analyses and Chen Wei for field assistance. Prof Nelson Eby, Prof Paul T. Robinson and an anonymous reviewer are thanked for providing useful comments that helped to improve this paper.

References

 

DC FieldValueLanguage
dc.contributor.authorZhao, JHen_HK
dc.contributor.authorZhou, MFen_HK
dc.date.accessioned2010-05-31T03:34:56Z-
dc.date.available2010-05-31T03:34:56Z-
dc.date.issued2009en_HK
dc.identifier.citationLithos, 2009, v. 107 n. 3-4, p. 152-168en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58681-
dc.description.abstractThe 820-Ma Wangjiangshan, 814-Ma Beiba, 780-Ma Bijigou and 746-Ma Luojiaba mafic-ultramafic intrusions in the Hannan region of the northern margin of the Yangtze Block, South China, are used to constrain the secular evolution of the lithospheric mantle. These intrusions are mainly composed of gabbros, but the Beiba and Wangjiangshan intrusions also contain diorite. Rocks from these four intrusions have arc-like geochemical characteristics with high Ba/Nb (13-733), Ba/La (2-150), Sr/Nb (28-2320), Pb/Nb (0.2-13) and Ba/Th (107-7150) ratios relative to the primitive mantle. The Bijigou and Wangjiangshan intrusions have relatively constant initial 87Sr/86Sr ratios (0.703267 to 0.703729) and εNd(t) values (+ 2.95 to + 3.87). The Luojiaba intrusion has initial 87Sr/86Sr ratios (0.703690 to 0.703914) and εNd values (+ 0.93 to + 1.34) similar to those of the Beiba intrusion (87Sr/86Sr = 0.703768 to 0.704586; εNd = + 0.23 to + 1.98). The average zircon εHf values of the Bijigou and Wangjiangshan intrusions (+ 7.38 to + 9.58) are higher than those of the Luojiaba (+ 5.73) and Beiba intrusions (+ 4.76). The Wangjiangshan, Bijigou and Luojiaba intrusions do not show crustal contamination, whereas the Beiba intrusion shows evidence of crustal contamination. Modeling calculations reveal that the Wangjiangshan, Luojiaba and Beiba intrusions were produced by partial melting of garnet-spinel lherzolite to spinel lherzolite mantle, whereas the Bijigou intrusion was derived from a garnet lherzolite to garnet-spinel lherzolite mantle source. The arc-related geochemistry of these intrusions suggests that the lithospheric mantle sources were modified by slab fluids. The Luojiaba intrusion with high Th and high-field-strength-elements (HFSE) was derived from a mantle source enriched by sediment melts. Combined with 950 Ma arc volcanic rocks in the region, these intrusions support a model in which the lithospheric mantle beneath the northern margin of the Yangtze Block was enriched by slab-derived fluids since 950 Ma, and then depleted by melt extraction at ∼ 780 Ma, eventually further enriched by slab-derived melts at ∼ 746 Ma. © 2008 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_HK
dc.relation.ispartofLithosen_HK
dc.rightsLithos. Copyright © Elsevier BV.en_HK
dc.subjectMafic-ultramafic intrusionsen_HK
dc.subjectMantle evolutionen_HK
dc.subjectNeoproterozoicen_HK
dc.subjectPetrogenesisen_HK
dc.subjectSouth Chinaen_HK
dc.subjectYangtze Blocken_HK
dc.titleSecular evolution of the Neoproterozoic lithospheric mantle underneath the northern margin of the Yangtze Block, South Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-4937&volume=107&issue=3-4&spage=152&epage=168&date=2009&atitle=Secular+evolution+of+the+Neoproterozoic+lithospheric+mantle+underneath+the+northern+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.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.lithos.2008.09.017en_HK
dc.identifier.scopuseid_2-s2.0-58549109415en_HK
dc.identifier.hkuros167322en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-58549109415&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume107en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage152en_HK
dc.identifier.epage168en_HK
dc.identifier.isiWOS:000263711400002-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridZhao, JH=49061691300en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK

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