LIU Cheng-ai1, YI Li-wen1,2*, LU An-huai3, GU Xiang-ping4, YU Juan1, ZHANG Yuan-yuan1, LI Qiu-ping1
(1. College of Geographic Science, Hunan Normal University, Changsha 410081, China;
2. Hunan Key Laboratory of geospatial Big Data Mining and Application, Hunan Normal University, Changsha 410081, China;
3. School of Earth and Space Sciences, Peking University, Beijing 100871, China; 4. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China)
Abstract: Hutouya deposit is one of the most important lead-zinc polymetallic deposits in the Qimantage area, Qinghai Province. There are strongly developed magmatic rocks in the Qimantage area, with polymetallic ore-forming element combinations of Fe, Cu, Mo, Pb, Zn, and other elements. On the basis of previous research results, in this paper, through the analysis of the typomorphic characteristics of six kinds of main ore minerals, including chalcopyrite, sphalerite, magnetite, pyrrhotite, galena, and arsenopyrite in different veins of the Hutouya deposit, we have discussed their metallogenic significances of the deposit. Based on the analysis of Zn/Fe ratios (with respective average values of 19.62, 32.71, 24.91), Zn/Cd ratios (with respective average values of 179.39, 148.00, 182.33), Fe contents, and FeS contents for respective sphalerites and S contents, (Fe+Cu)/S ratios (wit respective average values of 1.97, 1.90, 1.86) for respective chalcopyrites in No.2, No.6, and No.7 veins of the Hutouya deposit, it is considered that the Hutouya deposit could be formed in the middle temperature environment, with the gradual decrease of the ore-forming temperatures from the main intrusive body, the fault contact zone, to the wallrock. In addition, the ore-forming temperatures of sphalerites in No.7 vein are decreased gradually from the first generation to the third generation of sphalerites. Based on the chemical composition characteristics of TiO2, Al2O3, MgO, MnO in magnetites and Fe, Mn, Cd, Zn in sphalerites, combined with geological characteristics of the deposit and previous research results, it is believed that the Hutouya deposit belongs to the skarn-type deposit.
Keywords: Typomorphic characteristics of minerals; the ore-forming temperature; genesis of ore deposits; EMPA; Hutouya deposit
ACTA MINERALOGICA SINICA Vol. 41, No.6, 2021, page 610-622
