辽西地区金矿成矿地质条件、矿床类型及找矿方向

THE METALLOGEOLOGIC SETTING, TYPES OF GOLD ORE DEPOSITS AND THE PROSPECTING ORIENTATION IN WESTERN LIAONING

辽西地区处于华北地台北缘中段，古亚洲洋与太平洋两大构造成矿域的叠加部位。区内晚太古代含金绿岩建造和燕山期Ａｕ－Ｃｕ系列花岗岩广泛发育，前者为形成金矿集中区的首要前提，后者是矿源层（岩）中成矿物质活化的主要营力。在区域上金矿床由于受纬向隆起带、深断裂、ＮＥ（ＮＮＥ）向构造岩浆活动带和ＮＷ向构造挤压带的联合控制，其分布呈菱形格局。区内金矿床可划分为绿岩建造、花岗岩建造、火山岩建造和沉积岩建造金矿床四大类。探索新类型和加强老矿区的深部找矿是今后主攻方向。

Western Liaoning is situated at the midsection of the northern margin of the North Chi- na Platfom，That is，the intersection of the paleo一Asia ccean and the Pacific ocean metallo-genic domain. rhere are much Later Archean auriferous greenston formation and TanshanianAu一Cu Series granitoid at the area of scientific investigation. The former is the major pre-condition of the formation of gold mineralization concentrated district，the latter is a main a- gent for the gold remobilization from source bed （rcok），The Spatial distribution of gold oredeposits is chiefly controlled by the EW trending upwarped zones，deep faults，the NE（NNE）trending structural一magmatic zones，the NW trending compressive structtires andtheir intersections，to show a rhombus shaped pattern，The gold ore deposits in this area areclassified into four types： Archean greenston formation type， Phanerozoic granitoid formationtype，Mesozoic Volcanic rock formation type and sedimentary rock formation type. It is animportant to reseach new types of gold ore deposits and to prospect deep and blind orebodiesat the gold mines.