重力异常与青藏高原地壳构造  

GRAVITY ANOMALIES AND CRUSTAL STRUCTURES IN THE QINGHAI-XIZANG PLATEAU

作　　者：孟令顺[1] 高锐[2] 周富祥[1] 李莉[2] 王华啸 

机构地区：[1]长春地质学院 [2]中国地质科学院

出　　处：《长春地质学院学报》1990年第3期307-314,共8页

基　　金：国家自然科学基金会重点资助项目;地矿部"七五"重点科技项目(课题)

摘　　要：1987年在青海格尔木—西藏亚东地区开展了1:50万重力路线扑点工作。在总长度1620km内,布设201个测站。利用上述资料计算了研究区的莫霍面深度及均衡异常(普拉特模式),分析了地壳与上地幔内的均衡信息。利用布格异常形态与测点高程的相关统计,在工区内划分了9个地体及13条较大的断裂。As a important part of the research plan of Chinese committee on Li-thosphere, the Changchun College of Geology togeth er with Lithosphere Center of Geological Academy in Chian carried out the gravity measurements of repairing stations (1:500000) along Golmud, Qinghai-Yadong,Xi-ang area in 1987. 201 stations were laid out along the profile which was about 1619 km in length. Based on these measurement datas, Mono depth and isostatic anomalies according to Pratt hypothesis were computed in this research area. The isostatic information of earth' s crust and upper mantle were analysed. Using correlation analysis of the Bouguer anomaly and station elevation, nine terranes and thirteen larger faults were divided in the tracsect. Finally,according to gravity standpoint the model of plateau uplift and collision of the plates was carried out. The direct force of plateau uplift is collision of the plates. The isostatic rise of plateau caused by glacier melting is verv slender and unimportant; distinguising of it from rapid rise caused by structure movement is very difficult.

关 键 词：重力 异常 地壳 构造 青藏 高原 

分 类 号：P313.2[天文地球—固体地球物理学]