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Article: Tectonic controls on the formation of the Liwu Cu-rich sulfide deposit in the Jianglang Dome, SW China

TitleTectonic controls on the formation of the Liwu Cu-rich sulfide deposit in the Jianglang Dome, SW China
Authors
KeywordsCo/Ni ratio in sulfides
Jianglang dome
Liwu Cu-rich deposit
Lower detachment fault
Sulfur isotope
SW China
Tectono-strata-bound deposit
Issue Date2003
PublisherWiley-Blackwell Publishing Ltd.. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=1344-1698
Citation
Resource Geology, 2003, v. 53 n. 2, p. 89-100 How to Cite?
AbstractThe Liwu Cu-rich sulfide deposit occurs within the Jianglang dome in the eastern margin of the Tibetan plateau. The dome consists of a core, a middle slab and a cover sequence. The main deposit is hosted in the core with minor ore bodies in the middle slab. The protolith of the core consists of clastic sedimentary rocks with inter-layered volcanic rocks. All of the ore bodies are substantially controlled by an extensional detachment fault system. The ore bodies within the core are distributed along the S 2 foliation in the hinge of recumbent fold (D 2), whereas ore bodies with en echelon arrangement are controlled by the mylonitic foliation of the lower detachment fault. Ore bodies within the middle slab are oriented with their axes parallel to the mylonitic foliation. Pyrite and pyrrhotite from the ores contain Co ranging from 37 to 1985 ppm, Ni from 2.5 to 28.1 ppm, and Co/Ni ratios from 5 to 71. These sulfides have δ 34S values ranging from 1.5 to 7.5 ‰ whereas quartz separates have δ 18O values of 11.9 and 14.3‰ and inclusion fluid in quartz has δD value of -88.1 ‰. These features suggest that the deposit was of hydrothermal origin. Two ore-forming stages are recognized in the evolution of the Jianglang dome. (1) A low-temperature ore-forming process, during the tectonic transport of the upper plate above the lower detachment, and the initial phase of the footwall updoming at 192-177 Ma. (2) A medium-temperature ore-forming stage, related to the final structural development of the initial detachment at 131-81Ma. Within the core, the ore bodies of the first stage were uplifted to, or near, the brittle/ductile horizon where the ore-forming metals were re-concentrated and enriched. A denudation stage in which a compressional tectonic event produced eastward thrusting overprinted the previous structures, and finally denuded the deposit. The Liwu Cu-rich sulfide deposit was formed during a regional extensional tectonic event and is defined as a tectono-strata-bound hydrothermal ore deposit.
Persistent Identifierhttp://hdl.handle.net/10722/73040
ISSN
2015 Impact Factor: 0.857
2015 SCImago Journal Rankings: 0.657
References

 

DC FieldValueLanguage
dc.contributor.authorYan, DPen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorSong, HLen_HK
dc.contributor.authorFu, ZRen_HK
dc.contributor.authorSun, Men_HK
dc.date.accessioned2010-09-06T06:47:29Z-
dc.date.available2010-09-06T06:47:29Z-
dc.date.issued2003en_HK
dc.identifier.citationResource Geology, 2003, v. 53 n. 2, p. 89-100en_HK
dc.identifier.issn1344-1698en_HK
dc.identifier.urihttp://hdl.handle.net/10722/73040-
dc.description.abstractThe Liwu Cu-rich sulfide deposit occurs within the Jianglang dome in the eastern margin of the Tibetan plateau. The dome consists of a core, a middle slab and a cover sequence. The main deposit is hosted in the core with minor ore bodies in the middle slab. The protolith of the core consists of clastic sedimentary rocks with inter-layered volcanic rocks. All of the ore bodies are substantially controlled by an extensional detachment fault system. The ore bodies within the core are distributed along the S 2 foliation in the hinge of recumbent fold (D 2), whereas ore bodies with en echelon arrangement are controlled by the mylonitic foliation of the lower detachment fault. Ore bodies within the middle slab are oriented with their axes parallel to the mylonitic foliation. Pyrite and pyrrhotite from the ores contain Co ranging from 37 to 1985 ppm, Ni from 2.5 to 28.1 ppm, and Co/Ni ratios from 5 to 71. These sulfides have δ 34S values ranging from 1.5 to 7.5 ‰ whereas quartz separates have δ 18O values of 11.9 and 14.3‰ and inclusion fluid in quartz has δD value of -88.1 ‰. These features suggest that the deposit was of hydrothermal origin. Two ore-forming stages are recognized in the evolution of the Jianglang dome. (1) A low-temperature ore-forming process, during the tectonic transport of the upper plate above the lower detachment, and the initial phase of the footwall updoming at 192-177 Ma. (2) A medium-temperature ore-forming stage, related to the final structural development of the initial detachment at 131-81Ma. Within the core, the ore bodies of the first stage were uplifted to, or near, the brittle/ductile horizon where the ore-forming metals were re-concentrated and enriched. A denudation stage in which a compressional tectonic event produced eastward thrusting overprinted the previous structures, and finally denuded the deposit. The Liwu Cu-rich sulfide deposit was formed during a regional extensional tectonic event and is defined as a tectono-strata-bound hydrothermal ore deposit.en_HK
dc.languageengen_HK
dc.publisherWiley-Blackwell Publishing Ltd.. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=1344-1698en_HK
dc.relation.ispartofResource Geologyen_HK
dc.rightsResource Geology. Copyright © Blackwell Publishing Ltd.en_HK
dc.subjectCo/Ni ratio in sulfidesen_HK
dc.subjectJianglang domeen_HK
dc.subjectLiwu Cu-rich depositen_HK
dc.subjectLower detachment faulten_HK
dc.subjectSulfur isotopeen_HK
dc.subjectSW Chinaen_HK
dc.subjectTectono-strata-bound depositen_HK
dc.titleTectonic controls on the formation of the Liwu Cu-rich sulfide deposit in the Jianglang Dome, SW Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1344-1698&volume=53&spage=89&epage=100&date=2003&atitle=Tectonic+controls+on+the+formation+of+the+Liwu+Cu-rich+sulfide+deposit+in+the+Jianglang+dome,+SW+Chinaen_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.scopuseid_2-s2.0-0242338479en_HK
dc.identifier.hkuros82621en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0242338479&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume53en_HK
dc.identifier.issue2en_HK
dc.identifier.spage89en_HK
dc.identifier.epage100en_HK
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridYan, DP=36683417500en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridSong, HL=47261333700en_HK
dc.identifier.scopusauthoridFu, ZR=7403347778en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK

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