Matched-filter analysis of aeromagnetic anomaly in mid-western Tibetan plateau and its tectonic implications

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	Matched-filter analysis of aeromagnetic anomaly in mid-western Tibetan plateau and its tectonic implications
	He, RZ (He Ri-Zheng); Gao, R (Gao Rui); Zheng, HW (Zheng Hong-Wei); Zhang, JS (Zhang Ji-Sheng)
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2007
卷号	50 期号:4 页码:1131-1140
关键词	Tibetan plateau subduction process matched-filter N-N-E strike strip of negative anomaly insidious strike-slip faults
ISSN号	0001-5733
英文摘要	Aeromagnetic anomaly data of AT reduced to the pole in the mid-western Tibetan plateau are reprocessed, using matched-filter method, to extract local regional anomalous field from total field. The best depth of filter-windows is about 19 km. Based on other geophysical evidence, the depth of windows, 19 km, is considered an important boundary in the crust, which separates the upper crust from middle crust. The extracted regional anomaly field shows that there is an N-N-E trending strip of negative aeromagnetic anomaly in the central Tibet. The evidence from teleseismic P-wave tomography shows that the location of negative anomaly strip is the same as that of deformed lithospheric mantle of Indian plate, which became hollow, a scoop-like shape. A lot of thermal anomaly from deep athenosphere, trapped by the scoop-like Indian lithospheric mantle, are responsible for that thermal demagnetization in the original lithosphere under the central Tibet plateau, thus the negative anomaly strip was formed. Moreover, an anomaly of a fault exists in the local anomalous field, and also in the regional one. The fault locates between the northern margin of Lhasa terrane and south side of Banggonghu-Nujiang Suture, about along the north of Ge'gyai to south of Gerze to north of Coqen to north of Xainza, from west to east. Combined with a lot of data from surface geology, focal mechanisms, distribution of hypocenters, the latest regional geological survey and Bouguer gravity anomaly, the fault is the western part of right-lateral strike-slip Jiali Fault.
学科主题	地球物理勘探
WOS关键词	SOUTHERN TIBET ; SEISMIC ANISOTROPY ; MANTLE BENEATH ; TOMOGRAPHY ; CRUST ; MAGMATISM ; KUNLUN ; FLOW
WOS研究方向	Geochemistry & Geophysics
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000248343500020
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38477]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China China Univ Geosci, Minist Educ China, Geodetect Lab, Beijing 100083, Peoples R China Peking Univ, Dept Geophys, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	He, RZ ,Gao, R ,Zheng, HW ,et al. Matched-filter analysis of aeromagnetic anomaly in mid-western Tibetan plateau and its tectonic implications[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2007,50(4):1131-1140.
APA	He, RZ ,Gao, R ,Zheng, HW ,&Zhang, JS .(2007).Matched-filter analysis of aeromagnetic anomaly in mid-western Tibetan plateau and its tectonic implications.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,50(4),1131-1140.
MLA	He, RZ ,et al."Matched-filter analysis of aeromagnetic anomaly in mid-western Tibetan plateau and its tectonic implications".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 50.4(2007):1131-1140.