念青唐古拉山深部构造特征研究  

Characteristics of Deep Structures under the Nyainqentanglha Mountains

作　　者：刘葵[1] 赵文津[2] 吴珍汉[1] 江万[1] 

机构地区：[1]中国地质科学院地质力学所,北京100081 [2]中国地质科学院,北京100037

出　　处：《地球学报》2005年第5期405-410,共6页Acta Geoscientica Sinica

基　　金：国土资源地质调查项目(编号:200313000062)与INDEPTHIII的部分研究成果。

摘　　要：本文利用INDEPTH项目深反射地震资料和大地电磁测深资料对念青唐古拉山地壳构造特征进行了深入细致的研究,通过对深反射地震资料的地震相分析及与大地电磁资料的比较得到:①16～22 km深度的部分熔融体是多个不连通的独立的穹隆;②在羊八井-当雄北地区,深45～58 km以下的下地壳深度存在NE走向的向形构造,该向形构造向北延伸、逐渐变深;③当雄北20 km附近,中下地壳在深29～58 km范围内存在大型的正断层,断距达6 km.Using the deep reflection seismic data and MT data of the INDEPTH project, the authors studied in detail the crustal structure. Through the seismic phase analysis of the deep reflection seismic data in comparison with the MT data, the following conclusions have been reached： ① The partially melted bodies are several independent domes 15 ～ 25 km under the Nyainqentanglha Mountains;② There is a rock body at the depth of 42～54 km in the lower crust, which looks like a NE-striking anticline that stretches northward and becomes increasingly deeper in that direction; ③ In the place 20 km north of Dangxiong City, there exists a large fault at the depth of 27～ 54 km in the middle crust, with the fault displacement as long as 6 km.

关 键 词：念青唐古拉山 地震相分析 深部构造 特征研究 大地电磁测深资料 INDEPTH 大地电磁资料 中下地壳 地震资料 构造特征 

分 类 号：P343.6[天文地球—水文科学] P542.5[天文地球—地球物理学]