Minerogenic prospective prognosis of leaching type turquoise on the northwestern margin of Wudang Uplift
Jian ZHANG1,2,3, Xue-Zhong YU3, Yi-Chuan LI3
1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China 2. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China 3. Aero Geophysical Survey & Remote Sensing Center for Natural and Resources, Beijing 100083, China;
Turquoise, a phosphate mineral assemblage of Cu, Al, is a valuable gem mineral. The western margin of Wudang Uplift in Hubei-Shaanxi border is an important producing area of high quality turquoise. Based on an analysis of geological characteristics and geological conditions of turquoise deposits, the authors hold that turquoise deposits mainly occur in lower Cambrian (carbon-bearing) siliceous rocks and are controlled by fault structures. Combined with the geophysical and geochemical characteristics of the deposits, the authors point out some ore-hunting indicators of turquoise deposits in this area as follows: Cambrian (carbon-bearing) siliceous strata, well-developed fault structures, areas with high Cu content, and areas with high radioactivity (high U content). According to geological, geophysical and geochemical data, the first and second order minerogenic prospective areas of turquoise were delineated.