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Article: Geochemistry and origin of listwanites in the Sartohay and Luobusa ophiolites, China

TitleGeochemistry and origin of listwanites in the Sartohay and Luobusa ophiolites, China
Authors
Issue Date2005
PublisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/TIGR
Citation
International Geology Review, 2005, v. 47 n. 2, p. 177-202 How to Cite?
AbstractGold-bearing listwanites of the Sartohay ophiolite, northwestern China, consist mainly of tale, magnesite, chlorite, quartz, and dolomite, locally accompanied by chromian mica (fuchsite). They formed along NE-trending faults by hydrothermal alteration of serpentinized peridotites. The original protoliths were clinopyroxene-bearing harzburgites and lherzolites containing relatively aluminous magnesiochromite. Compared to their protoliths, listwanites generally have lower MgO and significantly higher CaO, TiO 2, and total rare-earth elements. Gold mineralization occurs chiefly in large quartz veins with grades up to several tens of g/t. Listwanites in the Luobusa ophiolite, Tibet, form a narrow band along the southern boundary fault of the ophiolite. Some of these listwanites have relict textures, suggesting derivation from serpentinized peridotite; however, adjacent harzburgites and clinopyroxene-bearing harzburgites are very fresh, with less than 1% serpentinization. The Luobusa listwanites consist essentially of talc and magnesite with lesser amounts of quartz. Most are indistinguishable geochemically from the unserpentinized protoliths except for having notably higher loss on ignition. None of these rocks are mineralized. The Sartohay listwanites are spatially associated with granitic intrusions dated at 301 Ma. They were altered by relatively high temperature fluids, as indicated by homogenization temperatures of fluid inclusions in quartz ranging from 340 to 360°C. Those in the Luobusa ophiolite are not associated with any known igneous activity and are believed to have formed at somewhat lower temperatures. Although both varieties are completely altered and have generally similar mineral assemblages, only those of Sartohay show significant geochemical modification and gold mineralization. Both types have been moderately silicified and are easily recognized by their light brown color and resistant outcrops. Copyright © 2005 by V. H. Winston & Son, Inc. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151139
ISSN
2015 Impact Factor: 2.365
2015 SCImago Journal Rankings: 1.248
References

 

DC FieldValueLanguage
dc.contributor.authorRobinson, PTen_HK
dc.contributor.authorMalpas, Jen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorAsh, Cen_HK
dc.contributor.authorYang, JSen_HK
dc.contributor.authorBai, WJen_HK
dc.date.accessioned2012-06-26T06:17:35Z-
dc.date.available2012-06-26T06:17:35Z-
dc.date.issued2005en_HK
dc.identifier.citationInternational Geology Review, 2005, v. 47 n. 2, p. 177-202en_HK
dc.identifier.issn0020-6814en_HK
dc.identifier.urihttp://hdl.handle.net/10722/151139-
dc.description.abstractGold-bearing listwanites of the Sartohay ophiolite, northwestern China, consist mainly of tale, magnesite, chlorite, quartz, and dolomite, locally accompanied by chromian mica (fuchsite). They formed along NE-trending faults by hydrothermal alteration of serpentinized peridotites. The original protoliths were clinopyroxene-bearing harzburgites and lherzolites containing relatively aluminous magnesiochromite. Compared to their protoliths, listwanites generally have lower MgO and significantly higher CaO, TiO 2, and total rare-earth elements. Gold mineralization occurs chiefly in large quartz veins with grades up to several tens of g/t. Listwanites in the Luobusa ophiolite, Tibet, form a narrow band along the southern boundary fault of the ophiolite. Some of these listwanites have relict textures, suggesting derivation from serpentinized peridotite; however, adjacent harzburgites and clinopyroxene-bearing harzburgites are very fresh, with less than 1% serpentinization. The Luobusa listwanites consist essentially of talc and magnesite with lesser amounts of quartz. Most are indistinguishable geochemically from the unserpentinized protoliths except for having notably higher loss on ignition. None of these rocks are mineralized. The Sartohay listwanites are spatially associated with granitic intrusions dated at 301 Ma. They were altered by relatively high temperature fluids, as indicated by homogenization temperatures of fluid inclusions in quartz ranging from 340 to 360°C. Those in the Luobusa ophiolite are not associated with any known igneous activity and are believed to have formed at somewhat lower temperatures. Although both varieties are completely altered and have generally similar mineral assemblages, only those of Sartohay show significant geochemical modification and gold mineralization. Both types have been moderately silicified and are easily recognized by their light brown color and resistant outcrops. Copyright © 2005 by V. H. Winston & Son, Inc. All rights reserved.en_HK
dc.languageengen_US
dc.publisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/TIGRen_HK
dc.relation.ispartofInternational Geology Reviewen_HK
dc.titleGeochemistry and origin of listwanites in the Sartohay and Luobusa ophiolites, Chinaen_HK
dc.typeArticleen_HK
dc.identifier.emailMalpas, J: jgmalpas@hku.hken_HK
dc.identifier.emailZhou, MF: mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityMalpas, J=rp00059en_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-14644435054en_HK
dc.identifier.hkuros108760-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-14644435054&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume47en_HK
dc.identifier.issue2en_HK
dc.identifier.spage177en_HK
dc.identifier.epage202en_HK
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridRobinson, PT=7403720506en_HK
dc.identifier.scopusauthoridMalpas, J=7006136845en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridAsh, C=7006283892en_HK
dc.identifier.scopusauthoridYang, JS=8871818900en_HK
dc.identifier.scopusauthoridBai, WJ=9271474700en_HK

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