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Article: Helium and argon isotope geochemistry of alkaline intrusion-associated gold and copper deposits along the Red River-Jinshajiang fault belt, SW China

TitleHelium and argon isotope geochemistry of alkaline intrusion-associated gold and copper deposits along the Red River-Jinshajiang fault belt, SW China
Authors
KeywordsAlkaline Intrusion
Asw
Copper And Gold Deposits
Helium And Argon Isotopes
Mantle Fluids
Ore-Forming Fluid
Red River-Jinshajiang
Issue Date2004
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeo
Citation
Chemical Geology, 2004, v. 203 n. 3-4, p. 305-317 How to Cite?
AbstractThe Red River-Jinshajiang strike-slip fault zone on the eastern margin of the Tibetan plateau was originally produced by the India-Eurasia collision ∼60-70 Myr ago. Numerous post-collisional, mantle-derived alkaline igneous rocks, with ages of ∼40-30 Ma, have been intruded along this fault zone. In recent years, several copper and gold deposits associated with the alkaline intrusions of this region were discovered, such as the Yao'an and Beiya gold deposits and the Yulong and Machangqing copper deposits studied in this paper. The mineralised intrusions are felsic, with SiO 2 ranging from 61.4 to 67.7 wt.%, K 2O+Na 2O from 8.1 to 11.5 wt.% and K 2O/Na 2O>1. The deposits are located at both the exo- and endo-contact zones of the intrusions. The mineral deposits are of hydrothermal origin, with the ore-forming temperatures mainly in the range 150-450 °C. This paper presents He and Ar isotope analyses of these four deposits. The concentrations of 4He trapped in fluid inclusions of pyrites from the ores are (0.7-54.1)× 10 -6 cm 3 STP g -1, and those of 40Ar are (0.6-7.3)×10 -6 cm 3 STP g -1, 3He/ 4He ratios are 0.3-2.5 Ra (Ra represents the 3He/ 4He ratio of air, 1.39×10 -6), 40Ar/ 36Ar ratios are 316-1736, and 3He/ 36Ar ratios are 0.2-11.2× 10 -3. Generally, the 3He/ 4He, 40Ar/ 36Ar and 3He/ 36 Ar ratios for the gold deposits are higher than those for the copper deposits. We suggest that the ore-forming fluids of both gold and copper deposits were differentiated from the mantle-derived alkaline magmas, but were diluted by modified air-saturated water (MASW) that experienced intensive interaction with crustal rocks. However, the magmatic fluids responsible for the gold deposits were less extensively diluted by MASW, resulting in higher 3He/ 4He, 40Ar/ 36Ar and 3He/ 36Ar ratios than the copper deposits. © 2003 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151135
ISSN
2015 Impact Factor: 3.482
2015 SCImago Journal Rankings: 2.346
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorHu, RZen_US
dc.contributor.authorBurnard, PGen_US
dc.contributor.authorBi, XWen_US
dc.contributor.authorZhou, MFen_US
dc.contributor.authorPen, JTen_US
dc.contributor.authorSu, WCen_US
dc.contributor.authorWu, KXen_US
dc.date.accessioned2012-06-26T06:17:31Z-
dc.date.available2012-06-26T06:17:31Z-
dc.date.issued2004en_US
dc.identifier.citationChemical Geology, 2004, v. 203 n. 3-4, p. 305-317en_US
dc.identifier.issn0009-2541en_US
dc.identifier.urihttp://hdl.handle.net/10722/151135-
dc.description.abstractThe Red River-Jinshajiang strike-slip fault zone on the eastern margin of the Tibetan plateau was originally produced by the India-Eurasia collision ∼60-70 Myr ago. Numerous post-collisional, mantle-derived alkaline igneous rocks, with ages of ∼40-30 Ma, have been intruded along this fault zone. In recent years, several copper and gold deposits associated with the alkaline intrusions of this region were discovered, such as the Yao'an and Beiya gold deposits and the Yulong and Machangqing copper deposits studied in this paper. The mineralised intrusions are felsic, with SiO 2 ranging from 61.4 to 67.7 wt.%, K 2O+Na 2O from 8.1 to 11.5 wt.% and K 2O/Na 2O>1. The deposits are located at both the exo- and endo-contact zones of the intrusions. The mineral deposits are of hydrothermal origin, with the ore-forming temperatures mainly in the range 150-450 °C. This paper presents He and Ar isotope analyses of these four deposits. The concentrations of 4He trapped in fluid inclusions of pyrites from the ores are (0.7-54.1)× 10 -6 cm 3 STP g -1, and those of 40Ar are (0.6-7.3)×10 -6 cm 3 STP g -1, 3He/ 4He ratios are 0.3-2.5 Ra (Ra represents the 3He/ 4He ratio of air, 1.39×10 -6), 40Ar/ 36Ar ratios are 316-1736, and 3He/ 36Ar ratios are 0.2-11.2× 10 -3. Generally, the 3He/ 4He, 40Ar/ 36Ar and 3He/ 36 Ar ratios for the gold deposits are higher than those for the copper deposits. We suggest that the ore-forming fluids of both gold and copper deposits were differentiated from the mantle-derived alkaline magmas, but were diluted by modified air-saturated water (MASW) that experienced intensive interaction with crustal rocks. However, the magmatic fluids responsible for the gold deposits were less extensively diluted by MASW, resulting in higher 3He/ 4He, 40Ar/ 36Ar and 3He/ 36Ar ratios than the copper deposits. © 2003 Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeoen_US
dc.relation.ispartofChemical Geologyen_US
dc.rightsChemical Geology. Copyright © Elsevier BV.-
dc.subjectAlkaline Intrusionen_US
dc.subjectAswen_US
dc.subjectCopper And Gold Depositsen_US
dc.subjectHelium And Argon Isotopesen_US
dc.subjectMantle Fluidsen_US
dc.subjectOre-Forming Fluiden_US
dc.subjectRed River-Jinshajiangen_US
dc.titleHelium and argon isotope geochemistry of alkaline intrusion-associated gold and copper deposits along the Red River-Jinshajiang fault belt, SW Chinaen_US
dc.typeArticleen_US
dc.identifier.emailZhou, MF: mfzhou@hkucc.hku.hken_US
dc.identifier.authorityZhou, MF=rp00844en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.chemgeo.2003.10.006en_US
dc.identifier.scopuseid_2-s2.0-1342310661en_US
dc.identifier.hkuros91726-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-1342310661&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume203en_US
dc.identifier.issue3-4en_US
dc.identifier.spage305en_US
dc.identifier.epage317en_US
dc.identifier.isiWOS:000189087600007-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridHu, RZ=7202640800en_US
dc.identifier.scopusauthoridBurnard, PG=24754536900en_US
dc.identifier.scopusauthoridBi, XW=7102242579en_US
dc.identifier.scopusauthoridZhou, MF=7403506005en_US
dc.identifier.scopusauthoridPen, JT=7003379732en_US
dc.identifier.scopusauthoridSu, WC=7402010379en_US
dc.identifier.scopusauthoridWu, KX=11338922600en_US

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