File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Hydrothermal metallogeny of the Shanggong gold deposit, east Qinling: Study on the stable isotope geochemistry

TitleHydrothermal metallogeny of the Shanggong gold deposit, east Qinling: Study on the stable isotope geochemistry
Authors
KeywordsEast Qinling
Fluid
Metallogeny And Fluid Flow (Cmf)
Shanggong Au Deposit
Stable Isotope
Tectonic Model For Collisional Orogeny
Xiong'er Terrane
Issue Date2004
Citation
Kuangwu Yanshi, 2004, v. 24 n. 3, p. 13-21 How to Cite?
AbstractThe Shanggong Au deposit is a typical fault-controlled orogenic-type lode gold deposits. Its ore-forming process includes the early, middle and late stages. The δ18O values of ores and altered rocks are higher than those of unaltered rocks, suggesting that the rocks have extracted 18O from fluids during fluid-rock interaction. Nineteen δ18Ow values, ranging from 4. 2‰ - 13. 4‰ and averaging 8. 1‰, eight δDw values, ranging from - 66‰ - - 88‰ and averaging - 78‰ and a δ13Cankerite value (1. 5‰), suggest that the early stage fluids derived was from metamorphic devolatilization of carbonate-bearing strata. As for late stage, three δ18Ow values, ranging from - 2. 0‰ - - 0.6‰, a δDw value ( - 56‰), and three δ13Cankerite, ranging from - 1.6‰ - - 2. 2‰, show that the fluids were dominated by meteoric water. Three middle stage samples yield δ18O w values of 1. 9‰ - 4. 5‰ and δ 13CCO2 values of - 1. 2‰ - 0. 5‰, exactly between the values of the early and late stages. This strongly indicates that the middle stage was characterized by a mixing phase of metamorphic and meteoric fluids. The δDW values for middle stage range from - 113‰ to - 94‰, lower than those of the early and late stages, which can be interpreted as being resulted from large-scale precipitation of sulfides. 28 negative δ34S values for the middle stage sulfides ( - 19. 2‰ to - 6. 3‰) suggest a contribution of biogenic matter to ore-forming fluid-system. Theoretical synthesis shows that none of the main geologic units in the Xiong'er Terrane, i. e. the Taihua Supergroup, the Xiong'er Group and the Yanshanian granitoids, and the underlying lower crust and the mantle, could be considered as the source of ore fluids for the Shanggong Au deposit, although it was suggested in previous studies. Instead, a source which meets the isotopic constraints, is a carbonaceous carbonate-sandstone-shale-chert (CSC) sequence in the Guandaokou and Luanchuan Groups in the south of the Xiong'er Terrane. During the Mesozoic collision between the Yangtze and North China continents, the Guandaokou and Luanchuan Groups underthrusted beneath the Xiong'er Terrane along the north-dipping Machaoying A-type subduction zone, and then devolatilized through metamorphism, leading to the development of the Shanggong ore-forming fluid-system. Therefore, the CMF (collisional orogeny, metallogeny and fluid flow) model could be applied to the interpretation of the hydrothermal metallogenesis of the Shanggong Au deposit.
Persistent Identifierhttp://hdl.handle.net/10722/92220
ISSN
2015 SCImago Journal Rankings: 0.169
References

 

DC FieldValueLanguage
dc.contributor.authorChen, Y-Jen_HK
dc.contributor.authorLin, Z-Jen_HK
dc.contributor.authorPirajno, Fen_HK
dc.contributor.authorLi, Jen_HK
dc.contributor.authorWang, H-Hen_HK
dc.date.accessioned2010-09-17T10:39:37Z-
dc.date.available2010-09-17T10:39:37Z-
dc.date.issued2004en_HK
dc.identifier.citationKuangwu Yanshi, 2004, v. 24 n. 3, p. 13-21en_HK
dc.identifier.issn1001-6872en_HK
dc.identifier.urihttp://hdl.handle.net/10722/92220-
dc.description.abstractThe Shanggong Au deposit is a typical fault-controlled orogenic-type lode gold deposits. Its ore-forming process includes the early, middle and late stages. The δ18O values of ores and altered rocks are higher than those of unaltered rocks, suggesting that the rocks have extracted 18O from fluids during fluid-rock interaction. Nineteen δ18Ow values, ranging from 4. 2‰ - 13. 4‰ and averaging 8. 1‰, eight δDw values, ranging from - 66‰ - - 88‰ and averaging - 78‰ and a δ13Cankerite value (1. 5‰), suggest that the early stage fluids derived was from metamorphic devolatilization of carbonate-bearing strata. As for late stage, three δ18Ow values, ranging from - 2. 0‰ - - 0.6‰, a δDw value ( - 56‰), and three δ13Cankerite, ranging from - 1.6‰ - - 2. 2‰, show that the fluids were dominated by meteoric water. Three middle stage samples yield δ18O w values of 1. 9‰ - 4. 5‰ and δ 13CCO2 values of - 1. 2‰ - 0. 5‰, exactly between the values of the early and late stages. This strongly indicates that the middle stage was characterized by a mixing phase of metamorphic and meteoric fluids. The δDW values for middle stage range from - 113‰ to - 94‰, lower than those of the early and late stages, which can be interpreted as being resulted from large-scale precipitation of sulfides. 28 negative δ34S values for the middle stage sulfides ( - 19. 2‰ to - 6. 3‰) suggest a contribution of biogenic matter to ore-forming fluid-system. Theoretical synthesis shows that none of the main geologic units in the Xiong'er Terrane, i. e. the Taihua Supergroup, the Xiong'er Group and the Yanshanian granitoids, and the underlying lower crust and the mantle, could be considered as the source of ore fluids for the Shanggong Au deposit, although it was suggested in previous studies. Instead, a source which meets the isotopic constraints, is a carbonaceous carbonate-sandstone-shale-chert (CSC) sequence in the Guandaokou and Luanchuan Groups in the south of the Xiong'er Terrane. During the Mesozoic collision between the Yangtze and North China continents, the Guandaokou and Luanchuan Groups underthrusted beneath the Xiong'er Terrane along the north-dipping Machaoying A-type subduction zone, and then devolatilized through metamorphism, leading to the development of the Shanggong ore-forming fluid-system. Therefore, the CMF (collisional orogeny, metallogeny and fluid flow) model could be applied to the interpretation of the hydrothermal metallogenesis of the Shanggong Au deposit.en_HK
dc.languageengen_HK
dc.relation.ispartofKuangwu Yanshien_HK
dc.subjectEast Qinlingen_HK
dc.subjectFluiden_HK
dc.subjectMetallogeny And Fluid Flow (Cmf)en_HK
dc.subjectShanggong Au Depositen_HK
dc.subjectStable Isotopeen_HK
dc.subjectTectonic Model For Collisional Orogenyen_HK
dc.subjectXiong'er Terraneen_HK
dc.titleHydrothermal metallogeny of the Shanggong gold deposit, east Qinling: Study on the stable isotope geochemistryen_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.scopuseid_2-s2.0-10644223557en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-10644223557&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume24en_HK
dc.identifier.issue3en_HK
dc.identifier.spage13en_HK
dc.identifier.epage21en_HK

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats