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Article: Origin of the Tongshankou porphyry-skarn Cu-Mo deposit, eastern Yangtze craton, Eastern China: Geochronological, geochemical, and Sr-Nd-Hf isotopic constraints

TitleOrigin of the Tongshankou porphyry-skarn Cu-Mo deposit, eastern Yangtze craton, Eastern China: Geochronological, geochemical, and Sr-Nd-Hf isotopic constraints
Authors
KeywordsEasternChina
Geochronology
Porphyry Cu-Mo deposit
Sr-Nd-Hfisotopic constraint
Issue Date2008
PublisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00126/index.htm
Citation
Mineralium Deposita, 2008, v. 43 n. 3, p. 315-336 How to Cite?
AbstractThe Tongshankou Cu-Mo deposit, located in the westernmost Daye district of the Late Mesozoic Metallogenic Belt along the Middle-Lower reaches of the Yangtze River, eastern China, consists mainly of porphyry and skarn ores hosted in the Tongshankou granodiorite and along the contact with the Lower Triassic marine carbonates, respectively. Sensitive high-resolution ion microprobe zircon U-Pb dating constrains the crystallization of the granodiorite at 140.6±2.4 Ma (1σ). Six molybdenite samples from the porphyry ores yield Re-Os isochron age of 143.8±2.6 Ma (2σ), while a phlogopite sample from the skarn ores yields an 40Ar/39Ar plateau age of 143.0±0.3 Ma and an isochron age of 143.8±0.8 Ma (2σ), indicating an earliest Cretaceous mineralization event. The Tongshankou granodiorite has geochemical features resembling slab-derived adakites, such as high Sr (740-1,300 ppm) and enrichment in light rare earth elements (REE), low Sc (<10 ppm), Y (<13.3 ppm), and depletion in heavy REE (<1.2 ppm Yb), and resultant high Sr/Y (60-92) and La/Yb (26-75) ratios. However, they differ from typical subduction-related adakites by high K, low MgO and Mg#, and radiogenic Sr-Nd-Hf isotopic compositions, with (87Sr/ 86Sr)t = 0.7062-0.7067, εNd(t) = -4.37 to -4.63, (176Hf/177Hf)t = 0.282469-0.282590, and εHf(t) = -3.3 to -7.6. The geochemical and isotopic data, coupled with geological analysis, indicate that the Tongshankou granodiorite was most likely generated by partial melting of enriched lithospheric mantle that was previously metasomitized by slab melts related to an ancient subduction system. Magmas derived from such a source could have acquired a high oxidation state, as indicated by the assemblage of quartz-magnetite-titanite-amphibole-Mg-rich biotite in the Tongshankou granodiorite and the compositions of magmatic biotite that fall in the field between the NiNiO and magnetite-hematite buffers in the Fe3+-Fe2+-Mg diagram. Sulfur would have been present as sulfates in such highly oxidized magmas, so that chalcophile elements Cu and Mo were retained as incompatible elements in the melt, contributing to subsequent mineralization. A compilation of existing data reveals that porphyry and porphyry-related Cu-Fe-Au-Mo mineralization from Daye and other districts of the Metallogenic Belt along the Middle-Lower reaches of the Yangtze River took place coevally in the Early Cretaceous and was related to an intracontinental extensional environment, distinctly different from the arc-compressive setting of the Cenozoic age that has been responsible for the emplacement of most porphyry Cu deposits of the Pacific Rim. © Springer-Verlag 2007.
Persistent Identifierhttp://hdl.handle.net/10722/139148
ISSN
2015 Impact Factor: 3.467
2015 SCImago Journal Rankings: 1.677
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, JWen_HK
dc.contributor.authorZhao, XFen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorVasconcelos, Pen_HK
dc.contributor.authorMa, CQen_HK
dc.contributor.authorDeng, XDen_HK
dc.contributor.authorde Souza, ZSen_HK
dc.contributor.authorZhao, YXen_HK
dc.contributor.authorWu, Gen_HK
dc.date.accessioned2011-09-23T05:46:00Z-
dc.date.available2011-09-23T05:46:00Z-
dc.date.issued2008en_HK
dc.identifier.citationMineralium Deposita, 2008, v. 43 n. 3, p. 315-336en_HK
dc.identifier.issn0026-4598en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139148-
dc.description.abstractThe Tongshankou Cu-Mo deposit, located in the westernmost Daye district of the Late Mesozoic Metallogenic Belt along the Middle-Lower reaches of the Yangtze River, eastern China, consists mainly of porphyry and skarn ores hosted in the Tongshankou granodiorite and along the contact with the Lower Triassic marine carbonates, respectively. Sensitive high-resolution ion microprobe zircon U-Pb dating constrains the crystallization of the granodiorite at 140.6±2.4 Ma (1σ). Six molybdenite samples from the porphyry ores yield Re-Os isochron age of 143.8±2.6 Ma (2σ), while a phlogopite sample from the skarn ores yields an 40Ar/39Ar plateau age of 143.0±0.3 Ma and an isochron age of 143.8±0.8 Ma (2σ), indicating an earliest Cretaceous mineralization event. The Tongshankou granodiorite has geochemical features resembling slab-derived adakites, such as high Sr (740-1,300 ppm) and enrichment in light rare earth elements (REE), low Sc (<10 ppm), Y (<13.3 ppm), and depletion in heavy REE (<1.2 ppm Yb), and resultant high Sr/Y (60-92) and La/Yb (26-75) ratios. However, they differ from typical subduction-related adakites by high K, low MgO and Mg#, and radiogenic Sr-Nd-Hf isotopic compositions, with (87Sr/ 86Sr)t = 0.7062-0.7067, εNd(t) = -4.37 to -4.63, (176Hf/177Hf)t = 0.282469-0.282590, and εHf(t) = -3.3 to -7.6. The geochemical and isotopic data, coupled with geological analysis, indicate that the Tongshankou granodiorite was most likely generated by partial melting of enriched lithospheric mantle that was previously metasomitized by slab melts related to an ancient subduction system. Magmas derived from such a source could have acquired a high oxidation state, as indicated by the assemblage of quartz-magnetite-titanite-amphibole-Mg-rich biotite in the Tongshankou granodiorite and the compositions of magmatic biotite that fall in the field between the NiNiO and magnetite-hematite buffers in the Fe3+-Fe2+-Mg diagram. Sulfur would have been present as sulfates in such highly oxidized magmas, so that chalcophile elements Cu and Mo were retained as incompatible elements in the melt, contributing to subsequent mineralization. A compilation of existing data reveals that porphyry and porphyry-related Cu-Fe-Au-Mo mineralization from Daye and other districts of the Metallogenic Belt along the Middle-Lower reaches of the Yangtze River took place coevally in the Early Cretaceous and was related to an intracontinental extensional environment, distinctly different from the arc-compressive setting of the Cenozoic age that has been responsible for the emplacement of most porphyry Cu deposits of the Pacific Rim. © Springer-Verlag 2007.en_HK
dc.languageengen_US
dc.publisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00126/index.htmen_HK
dc.relation.ispartofMineralium Depositaen_HK
dc.rightsThe original publication is available at www.springerlink.com-
dc.subjectEasternChinaen_HK
dc.subjectGeochronologyen_HK
dc.subjectPorphyry Cu-Mo depositen_HK
dc.subjectSr-Nd-Hfisotopic constrainten_HK
dc.titleOrigin of the Tongshankou porphyry-skarn Cu-Mo deposit, eastern Yangtze craton, Eastern China: Geochronological, geochemical, and Sr-Nd-Hf isotopic constraintsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0026-4598&volume=43&issue=3&spage=315&epage=336&date=2008&atitle=Origin+of+the+Tongshankou+porphyry-skarn+Cu-Mo+deposit,+eastern+Yangtze+craton,+Eastern+China:+geochronological,+geochemical,+and+Sr-Nd-Hf+isotopic+constraintsen_US
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1007/s00126-007-0161-3en_HK
dc.identifier.scopuseid_2-s2.0-41249085703en_HK
dc.identifier.hkuros192928en_US
dc.identifier.hkuros144299-
dc.identifier.hkuros167303-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-41249085703&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume43en_HK
dc.identifier.issue3en_HK
dc.identifier.spage315en_HK
dc.identifier.epage336en_HK
dc.identifier.isiWOS:000254204400004-
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridLi, JW=36063037900en_HK
dc.identifier.scopusauthoridZhao, XF=8942065800en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridVasconcelos, P=7005771965en_HK
dc.identifier.scopusauthoridMa, CQ=8142218900en_HK
dc.identifier.scopusauthoridDeng, XD=16042105200en_HK
dc.identifier.scopusauthoridde Souza, ZS=6603234995en_HK
dc.identifier.scopusauthoridZhao, YX=23987121600en_HK
dc.identifier.scopusauthoridWu, G=23987362000en_HK
dc.identifier.citeulike2772683-

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