利用重力异常研究亚东—格尔木地壳构造  

INTERPRETATION OF THE CRUSTAL STRUCTURE IN YADONG-GOLMUD AREA USING GRAVITY ANOMALIES

作　　者：孟令顺[1] 高锐[2] 周富祥[1] 李莉[2] 王华啸 

机构地区：[1]长春地质学院应用地球物理系 [2]中国地质科学院岩石圈研究中心

出　　处：《地球学报》1990年第2期149-161,共13页Acta Geoscientica Sinica

摘　　要：作为亚东—格尔木地学断面研究项目的一个重要组成部分,于1987年完成了亚东—格尔木及东拉—尼木的重力补点测量(1:50万)工作,共布设了226个测点,全长1670km。在这些测量数据的基础上,计算了研究域内的莫霍深度和均衡异常,分析了地壳和上地幔的均衡信息。利用布格异常与测点高程的相关分析,划分出了9个地体和13个较大断裂;给出了高原隆起及板块碰撞的模式。我们认为高原隆起的直接作用来自板块的碰撞,由冰川消融引起的均衡回升是非常微弱和不重要的,要把这种作用与构造运动引起的快速隆升区分开来是相当困难的。As an important part of the plan of Chinese Committee on Lithosphere, an 1:500,000 gravity survey was conducted for supplementary stations in the Golmud (Qinghai)-Yadong (Xizang) and Dung La-Nimu (Xizang) in 1987 by the Changchun College of Geology and Lithosphere Research Center, CAGS. 202 stations were laid out along the profile, which is about 1670km. Based on the measurements, the Moho depth and isostatic anomalies according to Pratt's Hypothesis were computed in the study area. The isostatic information of the earth's crust and the upper mantle were analysed.Based on the correlation analysis between Bouguer anomalies and station elevations, nine terrains and thirteen large faults were recognized. Finally, from the gravity standpoint, we present a model of plateau bulge and plate collision, and point out that the direct force of plateau bulge is collision of the plates. The isostatic rise movement caused by glacier melt in the plateau is very weak and thought to be subordinate, which can hardly be distinguished from the rapid rise caused by the tectonic movement.

关 键 词：地壳构造 高原隆起 重力异常 均衡异常 地学断面 板块碰撞 隆升 布格异常 冰川消融 均衡理论 

分 类 号：P5[天文地球—地质学]