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Article: Crustal-contaminated komatiitic basalts in Southern China: Products of a Proterozoic mantle plume beneath the Yangtze Block

TitleCrustal-contaminated komatiitic basalts in Southern China: Products of a Proterozoic mantle plume beneath the Yangtze Block
Authors
KeywordsCrustal contamination
Komatiitic basalt
Proterozoic
Southern China
Issue Date2000
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres
Citation
Precambrian Research, 2000, v. 103 n. 3-4, p. 175-189 How to Cite?
AbstractAbundant mafic and ultramafic rocks including basalts, komatiitic basalts, and peridotites occur in the Proterozoic Sibao Group, northern Guangxi Province, China. Whereas the basalts are generally pillow lavas, the komatiitic basalts are typically spinifex-textured and, in a few cases, show pyroxene accumulation associated with Ni-Cu-(PGE) sulfide deposits. The peridotites occur in the lower portions of differentiated sills, which contain gabbro and diorite in their upper parts. The sills are believed to be co-magmatic with the komatiitic basalts. The spinifex rocks of the Jiepai and Hejia Flows have MgO ranging from 8.9 to 14.3 wt%. The Zhongkui Flow is highly fractionated to form a spinifex zone with lower MgO (5.3-5.9 wt%) and a cumulate zone with higher MgO (17.3-17.9 wt%). Overall the rocks have TiO 2 = 0.44-0.74 wt%. Relative to primitive mantle, they are enriched in Th and LREE, but exhibit negative Ti-, Nb-, and P-anomalies. These features are consistent with their formation from a crustally-contaminated komatiitic magma. During this process of crustal contamination, the magmas assimilated sulfur from sediments, which caused sulfide-segregation resulting in the formation of Ni-Cu-(PGE) sulfide deposits. The occurrence of the komatiitic basalts in the Sibao Group can be explained by the ascent of a mantle plume beneath a continental rift environment, and implies that the Yangtze Block may have had an Archean basement through which the Sibao komatiitic basalts erupted. (C) 2000 Elsevier Science B.V.
Persistent Identifierhttp://hdl.handle.net/10722/151042
ISSN
2015 Impact Factor: 4.037
2015 SCImago Journal Rankings: 3.214
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorZhao, TPen_HK
dc.contributor.authorMalpas, Jen_HK
dc.contributor.authorSun, Men_HK
dc.date.accessioned2012-06-26T06:16:26Z-
dc.date.available2012-06-26T06:16:26Z-
dc.date.issued2000en_HK
dc.identifier.citationPrecambrian Research, 2000, v. 103 n. 3-4, p. 175-189en_HK
dc.identifier.issn0301-9268en_HK
dc.identifier.urihttp://hdl.handle.net/10722/151042-
dc.description.abstractAbundant mafic and ultramafic rocks including basalts, komatiitic basalts, and peridotites occur in the Proterozoic Sibao Group, northern Guangxi Province, China. Whereas the basalts are generally pillow lavas, the komatiitic basalts are typically spinifex-textured and, in a few cases, show pyroxene accumulation associated with Ni-Cu-(PGE) sulfide deposits. The peridotites occur in the lower portions of differentiated sills, which contain gabbro and diorite in their upper parts. The sills are believed to be co-magmatic with the komatiitic basalts. The spinifex rocks of the Jiepai and Hejia Flows have MgO ranging from 8.9 to 14.3 wt%. The Zhongkui Flow is highly fractionated to form a spinifex zone with lower MgO (5.3-5.9 wt%) and a cumulate zone with higher MgO (17.3-17.9 wt%). Overall the rocks have TiO 2 = 0.44-0.74 wt%. Relative to primitive mantle, they are enriched in Th and LREE, but exhibit negative Ti-, Nb-, and P-anomalies. These features are consistent with their formation from a crustally-contaminated komatiitic magma. During this process of crustal contamination, the magmas assimilated sulfur from sediments, which caused sulfide-segregation resulting in the formation of Ni-Cu-(PGE) sulfide deposits. The occurrence of the komatiitic basalts in the Sibao Group can be explained by the ascent of a mantle plume beneath a continental rift environment, and implies that the Yangtze Block may have had an Archean basement through which the Sibao komatiitic basalts erupted. (C) 2000 Elsevier Science B.V.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamresen_HK
dc.relation.ispartofPrecambrian Researchen_HK
dc.rightsPrecambrian Research. Copyright © Elsevier BV.-
dc.subjectCrustal contaminationen_HK
dc.subjectKomatiitic basalten_HK
dc.subjectProterozoicen_HK
dc.subjectSouthern Chinaen_HK
dc.titleCrustal-contaminated komatiitic basalts in Southern China: Products of a Proterozoic mantle plume beneath the Yangtze Blocken_HK
dc.typeArticleen_HK
dc.identifier.emailZhou, MF: mfzhou@hkucc.hku.hken_HK
dc.identifier.emailMalpas, J: jgmalpas@hku.hken_HK
dc.identifier.emailSun, M: minsun@hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.identifier.authorityMalpas, J=rp00059en_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S0301-9268(00)00077-2en_HK
dc.identifier.scopuseid_2-s2.0-0034307004en_HK
dc.identifier.hkuros55615-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034307004&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume103en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage175en_HK
dc.identifier.epage189en_HK
dc.identifier.isiWOS:000089178800004-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridZhao, TP=35730612500en_HK
dc.identifier.scopusauthoridMalpas, J=7006136845en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK

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