H-O-S-Cu-Pb Isotopic Constraints on the Origin of the Nage Cu-Pb Deposit, Southeast Guizhou Province, SW China

	H-O-S-Cu-Pb Isotopic Constraints on the Origin of the Nage Cu-Pb Deposit, Southeast Guizhou Province, SW China
	Zhou Jiaxi; Wang Jingsong; Yang Dezhi; Liu Jinhai
	2013
发表期刊	Acta Geologica Sinica
卷号	87 期号:5 页码:1334-1343
摘要	The Nage Cu-Pb deposit, a new found ore deposit in the southeast Guizhou province, southwest China, is located on the southwestern margin of the Jiangnan Orogenic Belt. Ore bodies are hosted in slate and phyllite of Neoproterozoic Jialu and Wuye Formations, and are structurally controlled by EW-trending fault. It contains Cu and Pb metals about 0.12 million tonnes with grades of 0.2 wt% to 3.4 wt% Cu and 1.1 wt% to 9.27 wt% Pb. Massive and disseminated Cu-Pb ores from the Nage deposit occur as either veinlets or disseminations in silicified rocks. The ore minerals include chalcopyrite, galena and pyrite, and gangue minerals are quartz, sericite and chlorite. The H-O isotopic compositions of quartz, S-Cu-Pb isotopic compositions of sulfide minerals, Pb isotopic compositions of whole rocks and ores have been analyzed to trace the sources of ore-forming fluids and metals for the Nage Cu-Pb deposit. The Cu-NBS values of chalcopyrite range from -0.09% to +0.33 parts per thousand, similar to basic igneous rocks and chalcopyrite from magmatic deposits. Cu-65(NBS) values of chalcopyrite from the early, middle and final mineralization stages show an increasing trend due to Cu-63 prior migrated in gas phase when fluids exsolution from magma. 34S(CDT) values of sulfide minerals range from -2.7 parts per thousand to +2.8 parts per thousand, similar to mantle-derived sulfur (0 +/- 3 parts per thousand). The positive correlation between Cu-NBS and S-34(CDT) values of chalcopyrite indicates that a common source of copper metal and sulfur from magma. DH2O-SMOW and O-18(H2O-SMOV) values of water in fluid inclusions of quartz range from -60.7 parts per thousand to -44.4 parts per thousand and +7.9 parts per thousand to +9.0 parts per thousand (T=260 degrees C), respectively and fall in the field for magmatic and metamorphic waters, implicating that mixed sources for H2O in hydrothermal fluids. Ores and sulfide minerals have a small range of Pb isotopic compositions (Pb-208/Pb-204=38.152 to 38.384, Pb-207/Pb-204=15.656 to 17.708 and Pb-206/Pb-204=17.991 to 18.049) that are close to orogenic belt and upper crust Pb evolution curve, and similar to Neoproterozoic host rocks (Pb-208/Pb-204=38.201 to 38.6373, Pb-207/Pb-204=15.648 to 15.673 and Pb-206/Pb-204=17.820 to 18.258), but higher than diabase (Pb-208/Pb-204=37.830 to 38.012, Pb-207/Pb-204=15.620 to 15.635 and Pb-206/Pb-204=17.808 to 17.902). These results imply that the Pb metal originated mainly from host rocks. The H-O-S-Cu-Pb isotopes tegather with geology, indicating that the ore genesis of the Nage Cu-Pb deposit is post-magmatic hydrothermal type.
关键词	H-o-s-cu-pb Isotopes Sources Of Ore-forming Fluids And Metals Ore Genesis Nage Cu-pb Deposit Sw China
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/352002/5020
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
推荐引用方式 GB/T 7714	Zhou Jiaxi,Wang Jingsong,Yang Dezhi,et al. H-O-S-Cu-Pb Isotopic Constraints on the Origin of the Nage Cu-Pb Deposit, Southeast Guizhou Province, SW China[J]. Acta Geologica Sinica,2013,87(5):1334-1343.
APA	Zhou Jiaxi,Wang Jingsong,Yang Dezhi,&Liu Jinhai.(2013).H-O-S-Cu-Pb Isotopic Constraints on the Origin of the Nage Cu-Pb Deposit, Southeast Guizhou Province, SW China.Acta Geologica Sinica,87(5),1334-1343.
MLA	Zhou Jiaxi,et al."H-O-S-Cu-Pb Isotopic Constraints on the Origin of the Nage Cu-Pb Deposit, Southeast Guizhou Province, SW China".Acta Geologica Sinica 87.5(2013):1334-1343.

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