东昆仑东段深大断裂的新认识

青海东昆仑东段在地质上已划定有东昆中、东昆南、东昆北、布青山南缘、温泉-哇洪山等多条深大断裂构造.以东昆仑东段开展的10个图幅1:20万区域重力调查成果--布格重力异常为基础,依据窗口平均法、水平导数等数据处理方法提取的区域场及剩余场等丰富的重力异常信息,结合航磁异常等资料,对东昆中、东昆北等断裂构造的展布位置提出了新的看法,并根据重力资料新推断断裂构造12条,提出尖山-哈莉哈德山断裂为2个一级构造单元的分界,同时通过拟合布格重力异常长剖面的定量计算方法,获取了部分深大断裂构造在东昆仑东段的产状参数.

NEW UNDERSTANDING OF DEEP FAULTS IN THE EASTERN PART OF EAST KUNLUN MOUNTAINS

Several deep faults in the eastern part of East Kunlun Mountains within Qinghai Province were delimited, such as East Kun Middle, East Kun South, East Kun North, Buqing Mountain South Rim and Hot Spring-Hongwa Mountain. Based on Bouguer gravity anomalies and regional gravity investigation result of ten charts (1:200,000) in eastern East Kunlun Mountains as well as abundant gravity anomaly information like regional field and residual field information extracted form such data-processing methods as window average and horizontal derivative in combination with aeromagnetic anomaly and other information, this paper provides new opinions on the spreading locations of such deep faults as East Kunlun Middle and East Kunlun North. According to twelve faults inferred recently from gravity data, this paper also holds that the Jian Mountain-Halihade Mountain fault is the boundary fault of two first grade tectonic units. Using the quantitative computational method of fitting Bouguer Gravity Anomalies profile, the authors obtained the formation parameters of some deep faults in eastern East Kunlun Mountains.