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Characteristics of the ore‐forming fluid in the Huayuan Pb‐Zn ore filed, Northwest of Hunan Province, China

The Huayuan Pb-Zn ore field in Xiangxi is located in the southeastern margin of the Yangtze block and the mid-segment of the West Hunan-West Hubei metallogenic belt. The exposed stratum are the lower Cambrian Shipai Formation calcareous and silty shale, Qingxudong Formation dolomite(upper section) and limestone (lower section), the middle Cambrian Gaotai Formation argillaceous dolomite and the middle-upper Cambrian Loushanguan Formation dolarenite. The structure is mainly NE-NEE trending faults, such as the Huayuan-Zhangjiajie fault, the Lianghe-Changle fault and the Malichang fault, which are main rock-, oreand facies-controlling structures (Peng, 1986). Ore bodies in the Huayuan Pb-Zn ore files are hosted in algal limestone of the third submemeber, sand limestone of the fourth submemeber of the Lower Cambrian Qingxudong formation. The morphology of ore bodies is mainly layered and secondly veinlet. Mineral composition is simple, the metallic minerals are sphalerite, galena and little pyrite, the nonmetallic minerals are calcite, dolomite and a bit of barite, fluorite and asphalt. The ore textures are mainly subhedral to euhedral granular, and a small amount of metasomatic, inclusion and interstitial textures; the structures are mainly piebald, veinlet and disseminated secondarily. In addition, there are banded, spherulite, breccia and miarolitic structures. Hydrothermal-metallogenic period in the Huayuan Pb-Zn ore filed is divided into three stages: pyrite-sphalerite-dolomite-calcite-(fluorite) stage (I), pyrite-galena-sphalerite-calcite-barite-fluorite stage (II) and (sphalerite)-galena-calcite stage (III). The stage II is the main mineralizing event, followed by the stage I.