青藏东部玉树、昌都地区地质地球物理特征及找矿远景

区内矿产资源丰富，有铜、铅—锌、金、铁、汞、镍六种成型矿床。区内古生代、中生代地层中海相火山岩层可作为有利的赋矿层，中生代沉积地层，尤其是三叠系地层可作为有利找矿层。铜、铁矿床形成与侵入岩有关。成矿带明显受北西、北西西、北西转南北向区域性深、大断裂控制。与中—酸侵入岩有关的矿床，局部重力异常多表现为圆形、椭圆形的重力低，矿床主要位于负异常中心及边部地带。航磁异常多有异常反映，幅值一般在50nT以下。与赵基性—基性侵岩有关矿床，局部重力异常表现为椭圆形的正异常，矿床位于正异常边部，且与一正磁异常对应。

THE GEOPHYSICAL FEATURES AND ORE PROSPECTING IN THE YUSHU AND CHANGDU AREAS OF THE EASTERN QINGHAI AND TIBET

This area is abundant in mineral resources, including copper, lead zinc, gold, iron, mercury and nickel. The favorable host strata may be the Paleozoic and Mesozoic marine volcanic rocks in this area, in which the Mesozoic sedimentary strata, especially the Triassic system, can be available strata for ore prospecting. The genesis of copper and nickel deposits is related to the intrusive rocks. The mineralized zones are evidently controlled by regional deep and major faults at northwest, northwest west, northwest to south north directions. The deposits relevant to intermediate acid intrusive rocks were commonly presented by local gravity anomaly at lower in round and elliptical shapes. The deposits common occur in the center and/or marginal places with minus anomaly and the aeromagnetic anomaly appears to be abnormal reflection with a general breadth value under 50nT. Other deposits relevant to ultrabasic basic intrusive rocks, with which the local gravity anomaly with elliptical shape presents in a positive anomaly, often occur in the margin of the positive anomaly and correspond to a positive magnetic anomaly.