| Located in Shaoxing-Longquan uplift belt, Suichang Zhilingtou gold depositis an important silver and gold metallogenic province on the Wuyi uplift, thesoutheast margin of Zhejiang.This essay, on the basis of conscientious study of the result of previousresearches, explores the ore forming geological features, lithogeochemistry,chronostratigraphy, ore-forming fluid and mechanism of structural ore controlof Suichang Zhilingtou gold deposit. And the genesis of Suichang Zhilingtougold deposit is explored.Suichang Zhilingtou gold deposit mainly hosts in gneiss of Badou Group, andis mainly under the control of the ductile brittle shear zone, and ore-hostingstructures is NE-SW and nearly EW.Geochemical analysis shows Th, U, Ti, Nb, Ta, Ba, Sr are negative and Cs,Rb, K, Zr, Hf are rich in gneiss in this mining area, and that means the featuresare similar to island arc volcanics through the action of subduction. In acidvolcanic rocks-intrusive rocks of Yanshan period light rare earth elements aregenerally rich, Eu appears negative in a certain degree, which also shows thesimilar charcateristics of island arc volcanics through the action of subduction.The research of ore-forming fluid for Zhilingtou gold deposit shows mostgas-liquid inclusion, a few gas inclusions, crystal inclusions and CO2inclusions.The homogenization temperature of the fluid inclusions presents a featureshifting from high temperature to low temperature. Early ore-forming fluid is richin K+, Na+, Cl-, CO2and CH4, is K+-Na+-Cl--HCO3fluid, and is derived from thebasement metamorphosis; Late ore-forming fluid is rich in ore-forming fluid, relativelylack K+, is Na+-Cl--SO42-fluid, and is derived from volcanic hydrothermal.The geochronologic studies show the age of early mineralization is233-239.9Ma, during the Indosinian Huanan-Huabei collisional orogenicactivities and the age of late mineralization is96-114.2Ma, during massivevolcanic hydrothermal activities in yanshanian period. |
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