摘要
利用匹配滤波的方法处理了青藏高原布格重力异常数据。基于重力异常一阶垂直导数的径向平均对数能谱曲线,青藏高原布格重力异常场可分为三层异常场。其中龙木错—双湖构造带在中部重力异常场和深部重力异常场图中都有显现;革吉—改则—错勤—申扎隐伏断裂在浅部和中部重力异常场中都存在。另一个明显的特征是藏北都显示有巨大且平缓的低重力异常圈闭,这与藏北Pn波速较低和Sn波缺失的特征吻合;在藏南存在一系列近东西向展布的重力异常断块。
Bouguer gravity anomaly data from Qinghai-Tibet plateau were processed by the match-filter method.According to he first order vertical derivative radial average logarithmic energy spectrum curves,the Bouguer gravity anomaly in Qinghai-Tibet Plateau can be divided into three layers.The Longmuco-Shuanghu tectonic zone is always discerned in the middle and deep gravity anomaly field,whereas the Geji-Gaze-Cuoqen-Shenza concealed fault is always existent in the shallow and middle gravity anomaly field.There is a huge and smooth low gravity anomaly contour line encirclement in Qiangtang terrane of northern Tibet,and there exist a series of WE-trending gravity anomaly blocks in southern Tibet.
出处
《中国地质》
CAS
CSCD
北大核心
2010年第4期995-1001,共7页
Geology in China
基金
国家自然科学基金(40904026
40774051
40974060)
中国地质科学院地质研究所基本科研业务费(J0911
J0915)
科技部国际合作项目(2006DFA21340)
地下信息探测技术与仪器教育部重点实验室(中国地质大学
北京)开放课题项目(GDL0901)
SinoProbe-2资助