| Jin Taizi deposit in the Dadu River gold metallogenic belt, Located in the western margin of the Yangtze platform, both sides of Kangding dadu river. The gold deposits in the area are divided into three types, the basement, the cover and the interface. Mainly for the quartz vein type gold deposit and altered rock quartz vein type gold deposit. This paper selects the typical deposit Jintaizi deposits in cover as the research object, Deposit metallogenic epoch identified by ESR dating, While studying the geological characteristics of the deposit, trace elements, rare earth elements geochemistry and geochemistry of rocks are used to study the mineralization processes, ore-forming processes, and the sources of ore-forming fluids and materials.Because of the degree of Jin Taizi gold deposit is very low, This article will compare Jin Taizi deposit with Pian Yanzi gold deposits in the cover and Yi Zhuxiang gold deposits in the basement, Find out the similarities and differences between them, so as to explore the origin of the ore deposit. Through the research of this paper, the main points are as follows:(1)Gold mineralization in the Dadu River valley zone is mainly quartz vein type gold deposit, the partial eclipse variable rock quartz vein type and Jin Taizi gold deposit belongs to quartz vein type gold deposit.(2) Jin Taizi- Chang Yanwo gold deposits in the area mainly constructed for basement and cover layer between the regional angular unconformity, mining development in the ductile shear belt is the main ore bearing fault zone.(3) Through the quartz activation ESR dating that Jintaizi gold deposit, the metallogenic age of 12.2 ~ 14.8 Ma, indicating that the gold table gold deposits mainly formed in early Cenozoic Himalayan orogeny of the Qinghai Tibet Plateau and the post collision stage.(4) Through the comparative analysis of the Jin Taizi,Pian Yanzi, Yi Zhuxiang deposit in pyrite, quartz single rare earth element mineral shows the REE distribution patterns are consistent, generally are the gentle right curve, extremely weak Eu anomaly and negative Ce anomaly, Show that the ore-forming fluid of Jin Taizi gold deposit formed in relatively deoxidize conditions.(5) The three ore deposits Homogenization Temperature in the same temperature range, mainly distributed in 170 degrees to 250 degrees Celsius, belong to the medium and low temperature hydrothermal deposit. Homogenization Temperature from high to low temperatures are displayed, shows that Jin Taizi gold deposit has the complex metallogenic process.(6) Through the comparative analysis the pyrite trace element characteristics of the Jin Taizi, Chang Yanwo and Yi Zhuxiang gold deposit, Jin Taizi gold deposit belongs to metamorphic hydrothermal deposit related to the deep hot magma liquid. |
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