从INDEPTH-MT结果探讨雅鲁藏布江缝合带的电性结构  

AN APPROACH ON SUBDUCTION OF INDIAN PLATE FROM INDEPTH MT RESULTS

作　　者：谭捍东 陈乐寿 魏文博 邓明 胡建德 金胜 

出　　处：《现代地质》1997年第3期375-378,共4页Geoscience

基　　金：中国国家自然科学基金;美国国家科学基金

摘　　要：ＩＮＤＥＰＴＨＭＴ研究结果表明，在雅鲁藏布江未发现反映深断裂的电性显示，而在江孜和仁布之间见有规模宏大、底界深达５５ｋｍ、向北倾斜的低阻高导体。这表明该区可能为雅鲁藏布江缝合带在地表出露的实际位置。高导体范围内存在３组反映断裂构造的电性梯度带和畸变带。３条断裂带向北倾斜，沿纵深向主断裂带Ｆ３汇聚。其北侧，发育多条南倾断裂，它们共同构成雅鲁藏布江缝合带发散状断裂构造特征。大规模高导体的存在与地下热状态是密切相关的。Because the rise of the Tibetan plateau is closely related with the subduction of the Indian plate, the study about the plate subduction has been an international focus in geological circle. The authors, firstly, present a review on this respect, and then the electrical structure of the crust beneath central and southern Tibet is shown from the INDEPTH MT results, and the subduction process of the Indian crust is deduced from deep seismic results and geological data. It is believed that because of the molten and bottom molten the thickness of the subduction crust was reduced gradually and was reduced rapidly toward the north. It is presumed that the north edge of the subduction of the Indian plate should not go beyond Dangxiong.

关 键 词：大地电磁测深 雅鲁藏布江 缝合带 电性结构 

分 类 号：P631.322[天文地球—地质矿产勘探]