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Origin of the Oligocene Tuolangla porphyry-skarn Cu-W-Mo deposit in Lhasa terrane,southern Tibet

China Geology 2020年第3期3卷 369-384页

作者： Yong Huang Ming-hua Ren Wei Liang Guang-ming Li kelly heilbronn Zuo-wen Dai Yi-yun Wang Li Zhang Chengdu Center China Geological SurveyMinistry of Natural ResourcesChengdu 610081China Department of Geoscience University of NevadaLas VegasNV 89154-4010USA Economic Geology Research Center James Cook UniversityTownsville 4811Australia College of Earth Sciences Chengdu University of TechnologyChengdu 610059China

Although some porphyry-skarn deposits occur in post-collisional extensional settings,the post-collisional deposits remain poorly *** the authors describe the igneous geology,and mineralization history of Tuolangla,a newly-discovered porphyry-skarn Cu-W-Mo deposit in southern Tibet that belongs to the post-collisional *** deposit is associated with Lower Cretaceous Bima *** was intruded by granodiorite porphyry intrusions at about 23.1 *** investigation indicated that mineralization is spatially and temporally associated with granodiorite *** yielded a Re-Os weighted mean age of 23.5±0.3 Ma and is considered to represent the age of skarn mineralization at the ***δ^34S values of sulfides,concentrated in a range between 0.6‰to 3.4‰,show that the sulfur has a homogeneous source with characteristics of magmatic *** Pb isotopic compositions of sulfides indicate that ore-forming metal materials were derived from the mantle and ancient *** granodiorite porphyry displays high SiO2(68.78%–69.75%)and K2O(3.40%–3.56%)contents,and relatively lower Cr(2.4×10^-6–4.09×10^-6),Ni(2.79×10^-6–3.58×10^-6)contents,and positiveεHf(t)values(7.7–12.9)indicating that the mineralization porphyry was derived from the partial melting of juvenile lower *** Tuolangla deposit is located in the central part of Zedang *** terrane was once considered an ancient *** terrane is in tectonic contact with Cretaceous ophiolitic rocks to its south and Mesozoic continental margin arc volcanics and intrusions of the Gangdese batholith of the Lhasa terrane to its ***,the authors proposed that the Oligocene porphyry skarn Cu-W-Mo mineralization is probably associated with the Zedang *** finding may clarify why the Oligocene(about 23 Ma)deposits are found only in the Zedang area and why mineralization types of the Oligocene mineralization are considerably different from those of the Miocene(17–14 Ma)mine

关键词： Porphyry skarn type Cu-W-Mo deposit Geochronology Re-Os isotopic age Zircon U-Pb isotopic age Tuolangla Gangdese belt Tibet China

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