Study on Fluid Inclusion Assemblages (FIA) and Origin of the Shuanghe Barite-fluorite Deposit in the Northeastern Guizhou
LI Min, ZOU Hao*, CHEN Hai-feng, JIANG Xiu-wei, LIU Chun-mei
College of Earth Science, Chengdu University of Technology,Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation of Ministry of Land and Resources,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu 610059, China
Abstract：The Shuanghe barite-fluorite deposit is located in the Yanhe area of northeastern Guizhou. The orebodies are mainly hosted in the Lower Ordovician carbonate rocks and are strictly controlled by faults. In order to explore mineralization process of the Shuanghe deposit, we have studied the characteristics of ore-forming fluids of the deposit by using the fluid inclusion assembly (FIA) method in this paper. The results show that there are monophase aqueous inclusions and liquid-rich biphase inclusions. The fluid inclusions in the early fluorite and late fluorite have homogenization temperatures of 89-131℃ and 99-122 ℃, respectively, salinities of 3.83%-20.84% NaCleqv and 5.37%-19.20% NaCleqv, respectively, and estimated overall densities of 0.97-1.11g/cm3. The laser Raman spectroscopy analyses show that the ore-forming fluid is mainly composed of H2O, but the early stage ore-forming fluid contains a certain amount of CH4. Therefore, it is comprehensively inferred that the Shuanghe deposit belongs to a low-temperature hydrothermal deposit which was formed under the influence of meteoric water and construction water due to the decrease of temperature. Based on previous studies on other fluorite deposits in the area, we have inferred that the Shuanghe deposit could be formed in the same ore-forming fluid field of the fluorite deposits in the southeastern Sichuan.
李敏, 邹灏, 陈海锋, 蒋修未, 刘春梅. 黔东北双河重晶石-萤石矿床流体包裹体组合研究及成因[J]. 矿物岩石地球化学通报, 2021, 40(4): 858-870.
LI Min, ZOU Hao, CHEN Hai-feng, JIANG Xiu-wei, LIU Chun-mei. Study on Fluid Inclusion Assemblages (FIA) and Origin of the Shuanghe Barite-fluorite Deposit in the Northeastern Guizhou. Acta Metallurgica Sinica, 2021, 40(4): 858-870.
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