File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Isotope systematics and fluid inclusion studies of the Qiyugou breccia pipe-hosted gold deposit, Qinling Orogen, Henan province, China: Implications for ore genesis

TitleIsotope systematics and fluid inclusion studies of the Qiyugou breccia pipe-hosted gold deposit, Qinling Orogen, Henan province, China: Implications for ore genesis
Authors
KeywordsBreccia Pipe
Gold Deposit
North China Craton
Qinling Orogen
Qiyugou
Issue Date2009
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/oregeorev
Citation
Ore Geology Reviews, 2009, v. 35 n. 2, p. 245-261 How to Cite?
AbstractThe Qiyugou gold deposits, Henan Province, are hosted in breccia pipes within the Xiong'er terrane (Qinling Orogen), on the southern margin of the North China Craton. In these deposits three paragenetic assemblages have been recognized: an early K-feldspar-epidote-quartz-pyrite; a middle quartz-polymetallic sulfide; and a late quartz-carbonate ± adularia. In this paper we review and interpret fluid inclusion and stable and radiogenic isotopic data of host rocks and ores. Fluid inclusions in quartz and calcite include water-rich, CO2-rich, and daughter crystal-bearing. The CO2-rich and daughter mineral-bearing fluid inclusions are common in the early-stage quartz and absent in the late-stage quartz and calcite which only contain water-rich fluid inclusions. Accordingly, the early-stage ore-fluids are magmatic in origin and characterized by high-temperature (> 350 °C), high-salinity (> 30 wt.% NaCl equiv.), and are CO2-rich. Fluid-boiling in the middle ore stage resulted in CO2-release, decreasing oxygen fugacity and rapid precipitation of ore materials. The late stage fluids, have low-temperature, low-salinity, are CO2-poor and lack daughter minerals. These fluids are probably sourced from meteoric water. H-O-C isotope systematics confirm that, the ore-fluid system evolved from magmatic to meteoric. The carbon and lead isotope ratios indicate that the Meso-Neoproterozoic sequence south of the Xiong'er terrane was the likely source of the ore-forming materials. The Qiyugou breccia-pipes and their associated gold ores were emplaced during an extensional regime following a transition from collision to rifting tectonics, linked to collision and subduction of the Yangtze plate beneath the North China Craton. Geochronological studies show that Mesozoic magmatism in the region occurred between the Triassic and Cretaceous. The Triassic to Jurassic magmas were mostly derived from partial melting of ancient crust, whereas the Cretaceous magmas show juvenile signatures, indicating mantle-derived components. Processes of fragmentation of lithospheric roots, crustal and lithospheric thinning, extension and rifting were probably associated with the subducting Pacific (Izanagi) plate. These crust-mantle geodynamic processes were responsible for the development of anorogenic granitic melts that interacted with the Meso-Neoproterozoic volatile-rich sedimentary successions, producing a flow of gas-rich hydrothermal fluids that resulted in the emplacement of the Qiyugou auriferous breccia pipes. We conclude that the Qiyugou gold deposits are intrusion-related explosive breccia pipe-type that evolved from hypothermal through mesothermal to epithermal. © 2008 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/92352
ISSN
2015 Impact Factor: 3.819
2015 SCImago Journal Rankings: 1.753
ISI Accession Number ID
Funding AgencyGrant Number
National 973-program2006CB403508
NSFC40425006
40730421
40352003
Funding Information:

This work was financially supported by the National 973-program (Project 2006CB403508), the NSFC (Grant Nos. 40425006, 40730421, 40352003) and Hundred Young Scientists Program of CAS. Franco Pirajno publishes with the permission of the Executive Director of the Geological Survey of Western Australia.

References

 

DC FieldValueLanguage
dc.contributor.authorChen, Y-jen_HK
dc.contributor.authorPirajno, Fen_HK
dc.contributor.authorLi, Nen_HK
dc.contributor.authorGuo, D-sen_HK
dc.contributor.authorLai, Yen_HK
dc.date.accessioned2010-09-17T10:43:31Z-
dc.date.available2010-09-17T10:43:31Z-
dc.date.issued2009en_HK
dc.identifier.citationOre Geology Reviews, 2009, v. 35 n. 2, p. 245-261en_HK
dc.identifier.issn0169-1368en_HK
dc.identifier.urihttp://hdl.handle.net/10722/92352-
dc.description.abstractThe Qiyugou gold deposits, Henan Province, are hosted in breccia pipes within the Xiong'er terrane (Qinling Orogen), on the southern margin of the North China Craton. In these deposits three paragenetic assemblages have been recognized: an early K-feldspar-epidote-quartz-pyrite; a middle quartz-polymetallic sulfide; and a late quartz-carbonate ± adularia. In this paper we review and interpret fluid inclusion and stable and radiogenic isotopic data of host rocks and ores. Fluid inclusions in quartz and calcite include water-rich, CO2-rich, and daughter crystal-bearing. The CO2-rich and daughter mineral-bearing fluid inclusions are common in the early-stage quartz and absent in the late-stage quartz and calcite which only contain water-rich fluid inclusions. Accordingly, the early-stage ore-fluids are magmatic in origin and characterized by high-temperature (> 350 °C), high-salinity (> 30 wt.% NaCl equiv.), and are CO2-rich. Fluid-boiling in the middle ore stage resulted in CO2-release, decreasing oxygen fugacity and rapid precipitation of ore materials. The late stage fluids, have low-temperature, low-salinity, are CO2-poor and lack daughter minerals. These fluids are probably sourced from meteoric water. H-O-C isotope systematics confirm that, the ore-fluid system evolved from magmatic to meteoric. The carbon and lead isotope ratios indicate that the Meso-Neoproterozoic sequence south of the Xiong'er terrane was the likely source of the ore-forming materials. The Qiyugou breccia-pipes and their associated gold ores were emplaced during an extensional regime following a transition from collision to rifting tectonics, linked to collision and subduction of the Yangtze plate beneath the North China Craton. Geochronological studies show that Mesozoic magmatism in the region occurred between the Triassic and Cretaceous. The Triassic to Jurassic magmas were mostly derived from partial melting of ancient crust, whereas the Cretaceous magmas show juvenile signatures, indicating mantle-derived components. Processes of fragmentation of lithospheric roots, crustal and lithospheric thinning, extension and rifting were probably associated with the subducting Pacific (Izanagi) plate. These crust-mantle geodynamic processes were responsible for the development of anorogenic granitic melts that interacted with the Meso-Neoproterozoic volatile-rich sedimentary successions, producing a flow of gas-rich hydrothermal fluids that resulted in the emplacement of the Qiyugou auriferous breccia pipes. We conclude that the Qiyugou gold deposits are intrusion-related explosive breccia pipe-type that evolved from hypothermal through mesothermal to epithermal. © 2008 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/oregeoreven_HK
dc.relation.ispartofOre Geology Reviewsen_HK
dc.subjectBreccia Pipeen_HK
dc.subjectGold Depositen_HK
dc.subjectNorth China Cratonen_HK
dc.subjectQinling Orogenen_HK
dc.subjectQiyugouen_HK
dc.titleIsotope systematics and fluid inclusion studies of the Qiyugou breccia pipe-hosted gold deposit, Qinling Orogen, Henan province, China: 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.oregeorev.2008.11.003en_HK
dc.identifier.scopuseid_2-s2.0-63749122752en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-63749122752&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume35en_HK
dc.identifier.issue2en_HK
dc.identifier.spage245en_HK
dc.identifier.epage261en_HK
dc.identifier.isiWOS:000265718200010-
dc.identifier.citeulike5326876-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats