青藏高原狮泉河-康西瓦地区 1:100万区域重力调查成果

利用最新取得的区域重力资料,参考航磁、遥感、区域地质资料,对青藏高原狮泉河-康西瓦地区重力场分区、断裂构造体系、构造单元、局部异常、深部构造、成矿远景区(带)等进行了研究.对阿尔金走滑断裂西南端的走向和延伸提出了一些新的看法;讨论了2条重力低值带的成因;推断了班公湖-怒江结合带下部莫霍面隆起的高度,从重力角度提出了对班公湖-怒江结合带的认识;认为青藏块体在拼合后地壳有2个加厚中心;新圈定了一个中、新生代沉积盆地,并进行了初步研究;结合地质、矿产、航磁等资料,初步划分出4个成矿远景区(带).

THE ACHIEVEMENTS OF 1:1 000 000 REGIONAL GRAVITY SURVEY IN SHIQUANHE-KANGXIWA AREA OF QINGHAI-TIBET PLATEAU

Utilizing the latest regional gravity data and consulting aeromagnetic, remote sensing and regional geological information, the author studied sub-areas of the gravitational field, faulted structural systems, tectonic elements, local anomalies, deep structures and ore-forming prospect areas (belt). Some new viewpoints were proposed concerning the trend and extension of the southwestern end of the Altun strike-slip fault, the origin of two low gravity zones was discussed, the altitude of the Moho discontinuity in the lower part of the Bangong Co-Nujiang junction zone was deduced, and the new understanding of the Bangong Co-Nujiang junction zone was proposed from the gravity angle. It is considered that there were two thickening centers in the earth crust after the collage of the Qinghai-Tibet blocks. A Mesozoic-Cenozoic sedimentary basin was recognized and preliminarily studied. In combination with such data as geology, mineral resources and aeromagnetic survey, four ore-forming prospect areas (belts) were tentatively delineated.