隐伏在青藏高原中部的东西走向断裂的航磁异常场特征及其意义

隐伏在青藏高原中部的东西走向断裂的航磁异常场特征及其意义

贺日政^1,2，高锐¹，郑洪伟³

1.中国地质科学院地质研究所，北京 100037;2.中国地质大学地下信息探测技术与仪器教育部重点实验室，北京 100083;3.北京大学地球与空间学院，北京 100871

收稿日期:2007-03-05 修回日期:1900-01-01 出版日期:2007-09-26 发布日期:2007-09-26
通讯作者: 贺日政

Areomagnetic Anomaly of Subtle East-West Striking Faults in the Central Tibet and Its Significance

HE Ri-zheng^1，2，GAO Rui¹，ZHENG Hong-wei³

1.Institute of Geology , Chinese Academy of Geological Sciences, Beijing 100037, China;2.Geodetection Laboratory, Ministry of Education of China, China University of Geosciences, Beijing 100083, China;3.School of Earth and Space Sciences, Peking Universtiy, Beijing 100871, China

Received:2007-03-05 Revised:1900-01-01 Online:2007-09-26 Published:2007-09-26
Contact: HE Ri-zheng

摘要/Abstract

摘要： 1998～2000年完成的青藏高原中西部航磁数据的综合分析结果显示，在青藏高原中部存在一个重要的隐伏断裂带（大致沿革吉北-改则南-错勤北-申扎北）。结合藏东位场分析结果，革吉北-改则南-错勤北-申扎北隐伏断裂可与嘉黎走滑断裂相连。沿该隐伏断裂发生的地震震源机制解显示，该断裂性质与嘉黎走滑断裂相同。因此，该隐伏断裂与位于藏东的嘉黎走滑断裂一起构成了位于高原中部的东西走向的巨型走滑断裂。这种推测得到了相关地质、地球物理证据和数值模拟结果的证实。此外，该巨型走滑断裂可能调节着青藏高原内部的应力分布，从而控制着高原内部的变形特征。

关键词: 青藏高原中部, 航磁异常, 向上延拓, 隐伏的东西走向断裂

Abstract: To study regional tectonics in the midwestern Tibet plateau, the data of areomagnetic anomaly suveryed from 1998 to 2000 is reprocessed by upward continuation method. The results of different upward continuation levels reveal a significant anomaly of a subtle fault which located between the northern margin of Lhasa terrane and south side of Banggonghu-Nujing Suture, about along Geji North to Gaze South to Cuoqen North to Shenza North, from west to east. Combined with other results, this subtle fault, together with Jiali strikeslip fault, forms a largescale E-W strikeslip fault in the central Tibet. And the conclusion is also supported by other evidences from surface geology, geophysics and modeling. The E-W strikeslip faults control the force distribution and deformation within Tibet plateau.

Key words: central Tibet, areomagnetic anomaly, upward continuation, subtle E-W striking fault

中图分类号:

P631.222

贺日政，高锐，郑洪伟. 隐伏在青藏高原中部的东西走向断裂的航磁异常场特征及其意义[J]. J4, 2007, 37(5): 1002-1008.

HE Ri-zheng，GAO Rui，ZHENG Hong-wei. Areomagnetic Anomaly of Subtle East-West Striking Faults in the Central Tibet and Its Significance[J]. J4, 2007, 37(5): 1002-1008.

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