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Article: The Shanggong gold deposit, Eastern Qinling Orogen, China: Isotope geochemistry and implications for ore genesis

TitleThe Shanggong gold deposit, Eastern Qinling Orogen, China: Isotope geochemistry and implications for ore genesis
Authors
KeywordsIsotope Geochemistry
Ore Genesis
Orogenic Lode
Qinling Orogen
Shanggong
Issue Date2008
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes
Citation
Journal of Asian Earth Sciences, 2008, v. 33 n. 3-4, p. 252-266 How to Cite?
AbstractThe Shanggong Au deposit in the Xiong'er Terrane, East Qinling, China, has resources of about 30 ton Au, making it one of the largest orogenic-mesothermal Au deposits hosted in volcanic rocks of the Mesoproterozoic Xiong'er Group. Three stages of hydrothermal activity are recognized (early, middle and late), of which two (early and middle) were ore producing and characterized by quartz-pyrite and polymetallic sulfides, respectively. The third and late stage is represented by a carbonate-quartz assemblage. Hydrogen, oxygen and carbon isotope systematics of the Shanggong deposit from a previous work suggest that the early stage fluids were derived from magmatic and/or metamorphic devolatilization of sedimentary rocks at depth. This is supported by new C, S and published Sr and Pb isotopic data, presented in this paper. These new data, δ13C values ranging from 1.5 ‰ for early stage ankerite to -2.2 ‰ for late stage ankerite, negative δ34S values for sulfides from the middle stage (-19.2 to -6.3 ‰), suggest a contribution from organic matter and that the ore fluid evolved from deeply sourced to shallowly sourced, with those of the middle stage representing a mixture of these two fluid systems. The comparison of the hydrogen-oxygen-carbon-sulfur-lead-strontium isotope systematics between the Shanggong deposit and the main lithologies in the Xiong'er Terrane, shows that neither these nor the underlying lower crust and mantle, or combinations thereof, could be considered as the source of ore fluids for the Shanggong Au deposit. A likely source was a carbonaceous carbonate, sandstone, shale, chert sequence in the underthrusted Guandaokou and Luanchuan Groups, exposed south of the Xiong'er Terrane. Ar-Ar and Rb-Sr isochron ages for mineral phases of the early, middle and late stages, together with geological field data, constrain the timing of the hydrothermal activity and Au metallogenesis at 242 ± 10, 167 ± 7 and 112 ± 7 Ma, respectively. This metallogenesis and associated granitic magmatism, can be related to the continental collision between the Yangtze and North China Cratons that resulted in the formation of the Qinling Orogen, led to the different hydrothermal systems that were responsible for the three stages that formed the Shanggong Au deposit, over a period of about 130 Myrs. © 2008 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/92195
ISSN
2015 Impact Factor: 2.647
2015 SCImago Journal Rankings: 1.393
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorChen, Y-Jen_HK
dc.contributor.authorPirajno, Fen_HK
dc.contributor.authorQi, J-Pen_HK
dc.date.accessioned2010-09-17T10:38:52Z-
dc.date.available2010-09-17T10:38:52Z-
dc.date.issued2008en_HK
dc.identifier.citationJournal of Asian Earth Sciences, 2008, v. 33 n. 3-4, p. 252-266en_HK
dc.identifier.issn1367-9120en_HK
dc.identifier.urihttp://hdl.handle.net/10722/92195-
dc.description.abstractThe Shanggong Au deposit in the Xiong'er Terrane, East Qinling, China, has resources of about 30 ton Au, making it one of the largest orogenic-mesothermal Au deposits hosted in volcanic rocks of the Mesoproterozoic Xiong'er Group. Three stages of hydrothermal activity are recognized (early, middle and late), of which two (early and middle) were ore producing and characterized by quartz-pyrite and polymetallic sulfides, respectively. The third and late stage is represented by a carbonate-quartz assemblage. Hydrogen, oxygen and carbon isotope systematics of the Shanggong deposit from a previous work suggest that the early stage fluids were derived from magmatic and/or metamorphic devolatilization of sedimentary rocks at depth. This is supported by new C, S and published Sr and Pb isotopic data, presented in this paper. These new data, δ13C values ranging from 1.5 ‰ for early stage ankerite to -2.2 ‰ for late stage ankerite, negative δ34S values for sulfides from the middle stage (-19.2 to -6.3 ‰), suggest a contribution from organic matter and that the ore fluid evolved from deeply sourced to shallowly sourced, with those of the middle stage representing a mixture of these two fluid systems. The comparison of the hydrogen-oxygen-carbon-sulfur-lead-strontium isotope systematics between the Shanggong deposit and the main lithologies in the Xiong'er Terrane, shows that neither these nor the underlying lower crust and mantle, or combinations thereof, could be considered as the source of ore fluids for the Shanggong Au deposit. A likely source was a carbonaceous carbonate, sandstone, shale, chert sequence in the underthrusted Guandaokou and Luanchuan Groups, exposed south of the Xiong'er Terrane. Ar-Ar and Rb-Sr isochron ages for mineral phases of the early, middle and late stages, together with geological field data, constrain the timing of the hydrothermal activity and Au metallogenesis at 242 ± 10, 167 ± 7 and 112 ± 7 Ma, respectively. This metallogenesis and associated granitic magmatism, can be related to the continental collision between the Yangtze and North China Cratons that resulted in the formation of the Qinling Orogen, led to the different hydrothermal systems that were responsible for the three stages that formed the Shanggong Au deposit, over a period of about 130 Myrs. © 2008 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaesen_HK
dc.relation.ispartofJournal of Asian Earth Sciencesen_HK
dc.subjectIsotope Geochemistryen_HK
dc.subjectOre Genesisen_HK
dc.subjectOrogenic Lodeen_HK
dc.subjectQinling Orogenen_HK
dc.subjectShanggongen_HK
dc.titleThe Shanggong gold deposit, Eastern Qinling Orogen, China: Isotope geochemistry and implications for ore genesisen_HK
dc.typeArticleen_HK
dc.identifier.emailChen, Y:ychenc@hkucc.hku.hken_HK
dc.identifier.authorityChen, Y=rp1318en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jseaes.2007.12.002en_HK
dc.identifier.scopuseid_2-s2.0-43949090186en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-43949090186&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume33en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage252en_HK
dc.identifier.epage266en_HK
dc.identifier.isiWOS:000257038700007-

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