PYRITE DEPOSITS OF THE HEJIA-XIAOLING MINE, LUJIANG-ZONGYANG BASIN, ANHUI PROVINCE: CHARACTERISTICS AND GENESIS
WU Changnian RUAN Huichu REN Qijiang HU Wenxuan (Department of Earth Sciences, Nanjing University, Nanjing, 210008)
The pyrite deposits in Hejia—Xiaoling mining area are controlled by the hydrothermal alteration of volcaniclastics of the first eruptive cycle (J_(AZHI)~1) of the Zhuanqiao Formation. There are four kinds of genetic deposits: 1) volcanic sedimentary; 2) subvolcanic rock; 3) superimposed transformation; and 4) volcanic hydrothermal solution types. Deposits are formed by the combined effects of volcanic magmatic endogenetic mineralization and later basinic diagenetic factors. Sulfur is principally derived initially from the upper mantle or the deep crust. The pyrite bodies occur as layer—bound deposits of typical middle—low temperature volcanic—sedimentary and hydrothermal superimposition types.