Ore geology, fluid inclusion and isotope geochemistry of the Xunyang Hg-Sb orefield, Qinling Orogen, Central China

	Ore geology, fluid inclusion and isotope geochemistry of the Xunyang Hg-Sb orefield, Qinling Orogen, Central China
	Ying Zhang; Hao-Shu Tang; Yan-Jing Chen; Cheng-Biao Leng; Cheng-Hai Zhao
	2014
发表期刊	Geological Journal
卷号	49 期号:4-5 页码:463-481
摘要	The Xunyang Hg-Sb orefield, Shaanxi Province, containing two large (Gongguan and Qingtonggou) and tens of small to medium Hg-Sb deposits, is located in the southern Qinling Orogen. Ore bodies of the deposits are hosted in Devonian dolomite and controlled by a fault system. Ores are mainly present as massive veins, disseminations, breccias and fine veinlets, with cinnabar (Hg) and stibnite (Sb) being the dominant ore minerals. Gangue minerals include quartz, calcite and dolomite. Hydrothermal minerals (quartz and calcite) only contain aqueous fluid inclusions with low homogenization temperature (135-274 degrees C) and salinity (1.23-12.3 wt.% NaCl equiv.), supporting an epizonogenic hydrothermal origin. The carbon, oxygen and hydrogen isotope data indicate that the ore-forming fluids were mainly sourced from epizonogenic to metamorphic devolatilization of the Sinian-Triassic strata that possibly underthrusted beneath the orefield, with inflow of the circulating meteoric water. Sulphur isotope ratios of stibnite and cinnabar range from 2% to 12%, suggesting a contribution from sedimentary sulphate or sulphate-bearing fluids potted in strata, which is coincident with the delta S-34 values (3.4-8.6%) of diagenetic pyrite in the strata. The conclusion drawn from sulphur isotopes is fully supported by the Pb isotope signatures. In addition, the Sr-87/Sr-86 ratios gradationally increase from ore-hosting dolostones, through ore-barren calcite or low-grade ores, to high-grade ores, indicating that a portion of the fluids originated from a source with higher Sr-87/Sr-86 values than the host-rocks, which is possibly composed of the Neoproterozoic-Lower Palaeozoic basement of the Xunyang Basin. Integrating the data from ore geology, fluid inclusion microthermometry and stable, radioactive isotope geochemistry, it can be concluded that the deposits in the Xunyang Hg-Sb orefieldwere formed by epizonogenic hydrothermal fluidsmainly sourced from the strata via structural deformation during the North China-Yangtze continental collision.
关键词	Xunyang Hg–sb Orefield Fluid Inclusion Isotope Geochemistry Ore Genesis Qinling Orogen Continental Collision 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/352002/5283
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	Ying Zhang,Hao-Shu Tang,Yan-Jing Chen,et al. Ore geology, fluid inclusion and isotope geochemistry of the Xunyang Hg-Sb orefield, Qinling Orogen, Central China[J]. Geological Journal,2014,49(4-5):463-481.
APA	Ying Zhang,Hao-Shu Tang,Yan-Jing Chen,Cheng-Biao Leng,&Cheng-Hai Zhao.(2014).Ore geology, fluid inclusion and isotope geochemistry of the Xunyang Hg-Sb orefield, Qinling Orogen, Central China.Geological Journal,49(4-5),463-481.
MLA	Ying Zhang,et al."Ore geology, fluid inclusion and isotope geochemistry of the Xunyang Hg-Sb orefield, Qinling Orogen, Central China".Geological Journal 49.4-5(2014):463-481.

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