| Gudongkeng fluorite deposit is located at the center of Cathaysia. It is a large-scale fluorite deposit in Jinyun County, Zhejiang Province. Gudongkeng fluorite ore deposit controlled by the NWW rift tectonic obviously. Orebody mainly occurs in the tuff of the Lower Cretaceous Guantou formation. Ore types are mainly fluorite type, quartz-fluorite type, wall rock alteration are mainly silicification, followed by sericitization, kaolin, carbonatization, etc. Metallogenic fluid characteristics are low salinity and low density; Ore-forming temperature is low, at around 150 °, the deposit is hypabyssal hydrothermal deposit in low temperature, The analysis of geological characteristics above indicate that the deposits is hydrothermal filling type fluorite deposit. The salinity main value is from 0.5wt%NaCl to 2.8wt%NaCl, The main value of density is between 0.9 and 0.98g/cm3. The average value of pressure is from2.7MPa to 38.7MPa. According to analysis on the geology and geochemistry characteristics, the deposit had generated F-rich formation before mineralization.During Yanshanian, due to the intense tectonic activities, fractures were generated and provide occurrence room for the assembling of ore-forming fluid, also a high geothermic gradient was generated and provides heat source for the circulation of meteoric water, which extracted ore-forming material from the Chencai group-complex metamorphic rock and surrounding rock, and finally gathered in the tuff in Guantou Group(K1g). The analysis, focused on the regional geology background, the distribution and structure deformation characteristics, shows that the Gudongkeng fluorite deposit is of good exploring potential. |
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