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Article: Geochemistry and petrogenesis of 270 Ma Ni-Cu-(PGE) sulfide-bearing mafic intrusions in the Huangshan district, Eastern Xinjiang, Northwest China: Implications for the tectonic evolution of the Central Asian orogenic belt

TitleGeochemistry and petrogenesis of 270 Ma Ni-Cu-(PGE) sulfide-bearing mafic intrusions in the Huangshan district, Eastern Xinjiang, Northwest China: Implications for the tectonic evolution of the Central Asian orogenic belt
Authors
KeywordsCentral Asian orogenic belt
Mafic-ultramafic intrusions
Mantle plume
Ni-Cu-(PGE) mineralization
Northwest China
Permian
Xinjiang
Issue Date2004
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeo
Citation
Chemical Geology, 2004, v. 209 n. 3-4, p. 233-257 How to Cite?
AbstractThe Central Asian orogenic belt (CAOB) is composed of remnants of microcontinents, island arcs and ophiolites. The presence of voluminous Phanerozoic A-type granites suggest that continental growth occurred through addition of juvenile crust, and the presence of mafic-ultramafic intrusions provides direct evidence for a mantle contribution. The origin of the mafic-ultramafic intrusions in the Huangshan area, Eastern Xinjiang, has been debated because of the lack of precise age data or trace element and isotopic analyses. We have studied the geology, petrology, geochemistry and geochronology of two of the intrusions: the Huangshanxi and Huangshandong intrusions. Both are typical layered mafic-ultramafic intrusions composed of diorite, troctolite,norite, gabbronorite, gabbro wehrlite, websterite and lherzolite with systematic geochemical variations that are consistent with the following crystallization sequence: Ol-(Chr), Ol-Pyx-(Chr), Cpx-Pl and Hbl-(Bt). Igneous zircons separated from a diorite in the Huangshanxi intrusion yield a 269±2 Ma SHRIMP U-Pb age. The rocks are enriched in Rb-Ba-U-K-Sr relative to Th and LREE, depleted in Nb-Ta relative to Th and exhibit positive εNd values (+6.7 to +9.3). Ni-Cu-(PGE) sulfide mineralization occurs in the lower parts of the intrusions, primarily strata-bound within wehrlite or lherzolite and locally stratiform along the margins of the intrusions. The parental magmas appear to have been derived from a mantle source that was previously contaminated by subduction of oceanic crust and to have been variably contaminated by upper continental crustal components. The intrusions appear to have formed by plume-related activity within a continental setting, likely related to post-orogenic extension following Carboniferous amalgamation of arc-related terranes in the CAOB. This plume activity was most likely also responsible for providing heat sources to generate large amounts of A-type granites across the CAOB. © 2004 Elsevier B.V. All right reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72721
ISSN
2015 Impact Factor: 3.482
2015 SCImago Journal Rankings: 2.346
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorLesher, CMen_HK
dc.contributor.authorYang, Zen_HK
dc.contributor.authorLi, Jen_HK
dc.contributor.authorSun, Men_HK
dc.date.accessioned2010-09-06T06:44:29Z-
dc.date.available2010-09-06T06:44:29Z-
dc.date.issued2004en_HK
dc.identifier.citationChemical Geology, 2004, v. 209 n. 3-4, p. 233-257en_HK
dc.identifier.issn0009-2541en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72721-
dc.description.abstractThe Central Asian orogenic belt (CAOB) is composed of remnants of microcontinents, island arcs and ophiolites. The presence of voluminous Phanerozoic A-type granites suggest that continental growth occurred through addition of juvenile crust, and the presence of mafic-ultramafic intrusions provides direct evidence for a mantle contribution. The origin of the mafic-ultramafic intrusions in the Huangshan area, Eastern Xinjiang, has been debated because of the lack of precise age data or trace element and isotopic analyses. We have studied the geology, petrology, geochemistry and geochronology of two of the intrusions: the Huangshanxi and Huangshandong intrusions. Both are typical layered mafic-ultramafic intrusions composed of diorite, troctolite,norite, gabbronorite, gabbro wehrlite, websterite and lherzolite with systematic geochemical variations that are consistent with the following crystallization sequence: Ol-(Chr), Ol-Pyx-(Chr), Cpx-Pl and Hbl-(Bt). Igneous zircons separated from a diorite in the Huangshanxi intrusion yield a 269±2 Ma SHRIMP U-Pb age. The rocks are enriched in Rb-Ba-U-K-Sr relative to Th and LREE, depleted in Nb-Ta relative to Th and exhibit positive εNd values (+6.7 to +9.3). Ni-Cu-(PGE) sulfide mineralization occurs in the lower parts of the intrusions, primarily strata-bound within wehrlite or lherzolite and locally stratiform along the margins of the intrusions. The parental magmas appear to have been derived from a mantle source that was previously contaminated by subduction of oceanic crust and to have been variably contaminated by upper continental crustal components. The intrusions appear to have formed by plume-related activity within a continental setting, likely related to post-orogenic extension following Carboniferous amalgamation of arc-related terranes in the CAOB. This plume activity was most likely also responsible for providing heat sources to generate large amounts of A-type granites across the CAOB. © 2004 Elsevier B.V. All right reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeoen_HK
dc.relation.ispartofChemical Geologyen_HK
dc.rightsChemical Geology . Copyright © Elsevier BV.en_HK
dc.subjectCentral Asian orogenic belten_HK
dc.subjectMafic-ultramafic intrusionsen_HK
dc.subjectMantle plumeen_HK
dc.subjectNi-Cu-(PGE) mineralizationen_HK
dc.subjectNorthwest Chinaen_HK
dc.subjectPermianen_HK
dc.subjectXinjiangen_HK
dc.titleGeochemistry and petrogenesis of 270 Ma Ni-Cu-(PGE) sulfide-bearing mafic intrusions in the Huangshan district, Eastern Xinjiang, Northwest China: Implications for the tectonic evolution of the Central Asian orogenic belten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0009-2541&volume=209&spage=233&epage=257.&date=2004&atitle=Geochemistry+and+petrogenesis+of+270+Ma+Ni-Cu-(PGE)+sulfide-bearing+mafic+intrusions+in+the+Huangshan+district,+Eastern+Xinjiang,+Northwest+China:+Implications+for+the+tectonic+evolution+of+the+central+Asian+orogenic+belten_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.chemgeo.2004.05.005en_HK
dc.identifier.scopuseid_2-s2.0-12144277380en_HK
dc.identifier.hkuros91717en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-12144277380&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume209en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage233en_HK
dc.identifier.epage257en_HK
dc.identifier.isiWOS:000223902800004-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridLesher, CM=7003946127en_HK
dc.identifier.scopusauthoridYang, Z=7405432218en_HK
dc.identifier.scopusauthoridLi, J=36063037900en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK

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