Origin of the Luping Pb deposit in the Beiya area, Yunnan Province, SW China: Constraints from geology, isotope geochemistry and geochronology

	Origin of the Luping Pb deposit in the Beiya area, Yunnan Province, SW China: Constraints from geology, isotope geochemistry and geochronology
	Jia-Xi Zhou; Song Dou; Zhi-Long Huang; Yin-Liang Cui; Lin Ye; Bo Li; Hai-Rui Sun; Ting Gan
	2016
发表期刊	Ore Geology Reviews
卷号	72 期号:1 页码:179-190
摘要	The Luping Pb deposit, a newly discovered Pb-(Fe-Au-Ag-Zn) polymetallic deposit close to the Cenozoic Beiya porphyry-related Au-(Fe-Cu-Pb-Zn-Ag) deposit, is located in the central Sanjiang (three rivers: Jinshajiang, Lancangjiang and Nujiang) region (western Yangtze Block) in southwestern China. Ore bodies of the Luping deposit are mainly stratiform type, host in the Middle Triassic Beiya Formation limestone and Lower Triassic Qingtianbao Formation sandstone, and occur along NNW-trending bedding-plane faults within axis of BeiyaQinghe syncline. Three ore types, namely the Pb-Au sulfide, Fe-Au, and Au ores, can be discerned regarding their ore metal association with reserves of 2.7 million tonnes (Mt) (average grade: 3.06 wt.% Pb, 0.66 g/t Au, 41 g/t Ag, and 0.82 wt.% Zn), 3 Mt (average grade: 30 wt.% Fe, 0.96 g/t Au and 31 g/t Ag), and 0.67 Mt (average grade: 2.16 g/t Au and 13 g/t Ag), respectively. Pb-Au sulfide ores contain mainly galena, siderite, native gold, sphalerite, and pyrite, with minor chalcopyrite, pyrrhotite and arsenopyrite, and gangue minerals such as quartz, calcite and dolomite. Sulfide ore textures include mainly brecciated, banded and vein, and minor massive and disseminated. LA-ICP-MS zircon U-Pb dating of alkali-rich quartz syenite porphyry from drill holes yielded a Late Eocene (Priabonian) age (36.2 +/- 0.4 Ma), broadly coeval to the zircon U-Pb ages (ca. 38 Ma-31 Ma) of alkaline porphyries and molybdenite Re-Os age (36.9 +/- 0.3 Ma) from the Beiya deposit near Luping. Calcite separates have delta C-13(PDB) and delta O-18(SMOW) values ranging from -5.8 parts per thousand to -5.1 parts per thousand (average: -5.6 parts per thousand) and +13.2 parts per thousand to + 14.7 parts per thousand (mean: +13.6 parts per thousand), respectively, suggesting association with the mantle. The sulfides have a narrow range of delta S-34(CDT) values (+ 0.8 parts per thousand-+2.8 parts per thousand, mean + 1.8 parts per thousand), which is similar to that of mantle-derived S (0 +/- 3 parts per thousand). Pb-206/Pb-204, Pb-207/Pb-204 and Pb-208/Pb-204 values of the sulfides range from 18.62 to 18.69, 15.66 to 15.70 and 38.92 to 39.08, respectively, similar to those of the porphyry whole-rock (Pb-206/Pb-204 (36) (Ma) = 18.61-18.71, Pb-207/Pb-204 (36 Ma) = 15.64-15.77 and Pb-208/Pb-204 36 Ma = 38.88-39.32). Ore deposit geology and C-O-S-Pb isotopic data suggest that the sources of metals and ore-forming fluids were likely to be derived from the alkali-rich porphyries in the Beiya area. We propose that the Luping deposit is best classified as an epithermal Pb polymetallic deposit associated with the Beiya alkaline porphyries (ca. 36 Ma-31 Ma). Similar to other deposits related to the Cenozoic alkaline porphyries in the Jinshajiang-Red River (Ailaoshan) metallogenic belt, the Luping deposit may have been formed in the India-Eurasia post-collisional setting, when partial melting occurred in the Triassic stagnant slab that thickened the lower crust and the upper mantle, producing the alkaline magmatism and its associated mineralization.
学科领域	矿床地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/6069
专题	矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文矿床地球化学国家重点实验室
推荐引用方式 GB/T 7714	Jia-Xi Zhou,Song Dou,Zhi-Long Huang,et al. Origin of the Luping Pb deposit in the Beiya area, Yunnan Province, SW China: Constraints from geology, isotope geochemistry and geochronology[J]. Ore Geology Reviews,2016,72(1):179-190.
APA	Jia-Xi Zhou.,Song Dou.,Zhi-Long Huang.,Yin-Liang Cui.,Lin Ye.,...&Ting Gan.(2016).Origin of the Luping Pb deposit in the Beiya area, Yunnan Province, SW China: Constraints from geology, isotope geochemistry and geochronology.Ore Geology Reviews,72(1),179-190.
MLA	Jia-Xi Zhou,et al."Origin of the Luping Pb deposit in the Beiya area, Yunnan Province, SW China: Constraints from geology, isotope geochemistry and geochronology".Ore Geology Reviews 72.1(2016):179-190.

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