Yongjun Shao

The geology and geochemistry of the Shizitou molybdenum deposit, Jiangxi province, China: Implications for the geodynamic setting

The Qin-Hang suture zone is the most important polymetallic metallogenic zone in southern China [1-2] and has the greatest resource potential. In recent years, a group of molybdenum (Mo) deposits have been discovered in the northeastern part of the Qin-Hang belt [3]. From Mar. 2006 to Dec. 2014, the Jiangxi Copper Group Geological Exploration Engineering Co., Ltd. conducted prospecting, preliminary exploration and detailed exploration in the Shizitou Mo deposit. The current reserves of the deposit have reached medium size. This paper attempts to characterize the timing of ore formation and the dynamic background of ore formation.

In-situ Major and Trace Elements Analysis for Garnets from the Xitian Orefield, SE China: Implications for Skarn-type Mineralization

The Xitian W-Sn polymetallic orefield is one of the most significant finds of tungsten–tin mineral resources in southeastern China, and the skarn orebodies have been considered to be the dominant mineralization type of the orefield (Zeng et al., 2005; Wu et al., 2011). The orefield lies at the intersection of the Qinzhou-Hangzhou Combined Zone (QCZ) and the Nanling Metallogenic Zone (Mao et al., 2011; Mao et al.,2013), comprising the Heshuxia, Goudalan, Longshang W–Sn deposits and Chaling Pb-Zn deposit. The Longshang W-Sn deposit and the Chaling Pb-Zn deposit situated in two sides of the Xitian Granite have skarn type mineralization developed. Garnet, as one of the most significant hydrothermal alteration minerals related to skarn-type mineralization, can be informative of the ore-forming fluid composition evolution during hydrothermal mineralization process, via implications from garnet geochemistry variations. The features of garnet composition variations during the skarn-type mineralization process of the Xitian W-Sn polymetallic orefield are discussed in this paper, by interpreting geochemical messages printed on garnets. The major and trace elements of garnets from the Longshang W-Sn deposit and the Chaling Pb-Zn deposit were measured using electron probe microanalysis (EPMA) and laser ablation inductively-coupled mass spectrometry (LA-ICP-MS). *

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.

Hydrothermal mineralization on Dengfuxian W-Sn-Pb-Zn orefield, SE China

1 Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, School of Geosciences and Info-Physics, Central South University, Changsha 410083, China 2 Non-Ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou, Guiyang 550005, China; 3 416 Geological Team, Bureau of Geology and Mineral Exploration and Development of Hunan Province, Zhuzhou 412007, China