A Comparative Study Of Uranium And Polymetallic Mineralization In The Xiangshan Ore Field In Jiangxi

Xiangshan ore field is the largest volcanic type uranium ore field in China.In recent years,it has shown that there are not only abundant uranium resources in this area,but also a large number of polymetallic mineralization in the deep part of the area.On the basis of previous studies,the metallogenic mechanism and the metallogenic system of uranium and polymetallic mineralization in Xiangshan ore field is analyzed by systematic research on the regional geological background,uranium and polymetallic metallogenic features,minerogenetic fluid characteristics,metallogenic material sources,metallogenic epoch and ore controlling structure.The uranium and polymetallic metallogenic models have been set up.This thesis mainly achieves the following results and understanding:(1)Xiangshan uranium and polymetallic minerals have characteristics of deep source.Among them,the mineralization of polymetallic minerals is derived from the magmatism of the deep crust and mantle mixture,and the uranium mineralized minerals are mainly derived from the deep mixed magma system,and some of the upper crust material is involved.(2)Xiangshan uranium and polymetallic metallogenic fluid source has great difference.Among them,the polymetallic ore-forming fluid is a mixture of crust and mantle and is mainly composed of crustal fluid and part of the mantle fluid,and the fluid of uranium mineralization may be mainly derived from the mantle or deep magmatic system.(3)Xiangshan uranium and polymetallic mineralization in different times.Among them,the metallogenic age of polymetallic mineralization is between121~129Ma and the main metallogenic age of uranium is about 99 Ma.According to the structural evolution characteristics of this area,uranium and polymetallic deposits in Xiangshan ore field are the products of mineralization in different stages during the Cretaceous orogeny extension faulting period.(4)The uranium and polymetallic mineralization in the Xiangshan ore field areclosely related to the early Cretaceous magmatic hydrothermal fluid,which belong to the same metallogenic series.Combined with previous research,this paper preliminarily considers that the uranium and polymetallic mineralization in Xiangshan ore field are middle high-middle low temperature type hydrothermal mineralization,and are subdivided into middle high temperature hydrothermal vein copper,lead,zinc and silver metallogenic subseries and middle low temperature hydrothermal uranium metallogenic subseries.