Geochemical characteristics of stream sediments and prospecting direction in Chahe area of Sichuan Province
XU Yun-Feng1,2(), HAO Xue-Feng1,2(), QIN Yu-Long1,2, WANG Xian-Feng1,2, XIONG Chang-Li1,2, LI Ming-Ze1,2, WU Weng-Hui1,2, ZHAN Han-Yu1,2
1. Sichuan Geological Survey Institute, Chengdu 610081, China 2. Evaluation and Utilization of Strategic Rare Metals and Rare Earth Resource Key Laboratory of Sichuan Province, Chengdu 610081, China
The Chahe deposit is the largest tin deposit in Sichuan Province. In order to gain a prospecting breakthrough, the authors conducted 1:50 000 stream sediment survey, studied the characteristics of element combination of this area by feature analysis and factor analysis of the measuring results. The results show that the three main ore-forming element groups of Ag-Pb-Zn, Bi-F-W-Sn and Cu-Ni have similar enrichment rules, in which the enrichment regularities of W, Sn and other medium and high temperature elements are extremely significant, and the overlapping features of the spatial distribution of the element anomalies are good.The lower limit values were determined by methods of cumulative frequency and iteration. The authors compiled the element anomaly maps and delineated nine comprehensive anomalies. By comprehensive evaluation of the anomalies, the authors consider that the Chahe and Fangjia composite anomalies are the prospective areas. The authors analyzed the geological condition for mineralization, carried out mineral inspection, and discovered a new skarn type tungsten-tin vein in the Chahe prospective area and more than ten new quartz-vein type tungsten veins in the Fangjia prospective area. The Fangjia prospective area, with a certain degree of similarity in geological characteristics with the "five-story+basement" prospecting model for tungsten deposits, has a favorite prospect in the search for polymetallic deposits such as tungsten, copper, lead and molybdenum.
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