Tarim periphery is an important concentration area of endogenous metal mineralization in China. The northern margin of Tarim is one of the important rare earth metallogenic belts in China. The exploration and discovery of several rare-earth deposits in Wajirtagh, Pozigoer, Yilanlik, Kuogataghi, Qieganbulak and Shanghu have made this region an important reserve base for large rare-earth deposits in Xinjiang. These newly discovered rare-earth deposits are commonly found in alkaline rocks or alkaline carbonate rocks, and most of them are large and medium-sized with high grade. On the whole, the research degree of rare-earth deposits in this area is generally very low. Based on the existing research results, this paper summarizes the geological characteristics, distribution rules and mineralization types of the main rare-earth deposits in the northern margin of Tarim Craton, combining with a large number of field investigations and laboratory studies in the last three years. According to the different tectonic environments formed by alkaline rocks, the rare-earth deposits related to alkaline rocks are divided into three tectonic types, namely active continental margin type, plate edge type and plate type. According to the mineralization types, the deposits in this area are further divided into four subclasses：rare earth deposits related to ultrabasic-alkaline complex, alkaline syenite type rare earth-Nb-Ta-Zr deposit, alkaline granite type rare earth-Nb-Ta-Zr deposit and alkaline pegmatite type rare earth-Nb-Ta-Zr deposit. Based on the study of typical deposits, the metallogenic dynamic background, geochemical characteristics and metallogenic dynamic process of rare earth deposits related to alkaline rocks in the study area are preliminarily discussed, and it is believed that the alkaline belt occurred in the orogenic tensional tectonic environment.
Xie Mingcai Su Benxun Wang Zhongmei Han Chunming. Research on the characteristics of rare and rare earth deposits associated with alkaline rocks in the northern margin of Tarim, Xinjiang[J]. Chinese Journal of Geology, 2020, 55(2): 420-438.