【作者】 高锐； 孟令顺； 李莉；

【Author】 Gao Rui~(1) Meng Lingshun~(2) Li Li~(1) (1)Lithosphere Research Center,CAGS. (2)Changchun College of Geology.

【机构】 中国地质科学院岩石圈研究中心； 长春地质学院应用地球物理系；

【摘要】 本文在微型计算机上实现了对研究区布格重力异常的数字滤波处理,并用假彩色图象的数字干涉技术,详细研究了地壳的现代构造格局和形变踪迹。追踪描述了由代表着地体边界断裂的东西向大型走滑断层的拉伸作用而形成的 NS 向正断层。识别出由 NE 向、NW 向构造构成的走滑断裂系统。走滑构造的活动是使青藏高原南北向缩短和地震活动的主要因素之一。突出深部异常的滤波图象显示出,麻江—比如的 NE 向走滑断裂至少切穿了上地壳。同时也指示出深部异常的最低值位于羌塘地体,从地壳均衡角度分析,可能意味着唐古拉山有很深的山根。更多还原

【Abstract】 Digital filtering processing has been carried out with a macrocomputer. By utilizing the pseudo-color image(digital interference)technique,we have investigated the recent structural features and deformation traces of the crust.This paper has discribed the extension process on the large West- East strike-slipes,which is considered as margin faults.The subsequent nor- mal faults are also mentioned.The fault system consisting of northeast and northwest structures was recognized.The activity of strike-slipes is one of the main reasons why Qinghai-Xizang plateau is shortened in North-South direction and earthquakes occur in this area.The filtered images that clear- ly reflect the deep anomalies show that the northeast-trending Yangba- jing-Biru strike-slip at least cuts through the upper crust.It is also seen that the lowest value of the deep anormalies is found around Qiangtang block,which,in the aspect of isostasy,may mean that Tanggula Mountain has a very deep root.更多还原