Geological and geochemical features and genesis of Dongfengding gold deposit

Taershan-Erfengshan district,located at southern Shanxi Province, is an upwarping subunit in the Linfen basin, and bas an area of about 900 km~2. The subunit was active in alkaline and subalkline magmatism during Mesozoic Yanshan period, and has a great potential for looking for gold deposits because the gold mineralization is widespread.The study on the Dongfengding gold deposit is essential in enlarging the size and perspective of the gold deposit. The veins of the Dongfengding gold deposit occur in faults, and the mineralization is of gold-bearing quarts-sulfide-barite vein with strong alteration in wall-rocks. It is proposed in this paper that the mineralization resulted from anatexis magma according to the reatures of ore geology, geochemistry, mineral assemblage, lead and sulfur isotopes, mineralization age, compositions of inclusions in minerals and purity of gold. The mineralized solution was mixture of magmatic water and meteoric water,and the ore veins formed under the condition of 140～400 ℃ temperature and about 1.5 km depth. The manner of mineralization is injection type of gold-bearing hydrothermal solution at moderate temperature and moderate depht.