The ore-controlling structure regu-larities and prospecting direction in Longshan Au-Sb deposit, Hunan Province

Longshan Au-Sb deposit is located in the southeast of Jiangnan block, and reaches south to South China fold belt, which is in the Yangzi plate. The feature of the regional structure include uplift belt and fold sys-tem, has both Jiangnan block and South China fold belt. The W-Sb-Au ore belt in the region is controlled by the Baimashan-Longshan uplift belt, and the Longshan Au-Sb deposit is controlled by Longshan dome. There're 4 times tectonic events in Longshan area. In The Xuefeng movement, the NWW strike Longshan dome was taking embryonic form. In the Caledonian movement, the NE strike comprehensive fold was formed. In the Indosinian movement, the NEE strike cleavages superimposed on the earlier folds. In the Yanshan movement, the NEE strike faults deformation went from plastic to brittle, and the structure predominantly fold become fault. Longshan Au-Sb deposit emplacement and the ore vein development are controlled by Longshan comprehensive inversion anticline. More groups fault in the center of the anticline are control the ore vein emplacement. The NWW strike faults, which is large angle intersect with regional cleavages, is the most ore-hosting structure. The parts intersect with NEE strike faults, NE strike faults, and fold axial plane cleavages, is the favorable parts for mineralization, there're tabular ore bodies distribute along the intersection. The ore bodies extend in dip direction is 1-1.5 times bigger than in the horizontal direction, and pitch to NW strike, which is the same strike with fold axial plane. NWW vein is the main mission of the next step prospecting.