Characteristic of Gravity and Magnetic Anomalies in the Daba Shan and;the Sichuan basin, China: Implication for Architecture of the Daba Shan

doi:10.1111/1755-6724.12117

	Characteristic of Gravity and Magnetic Anomalies in the Daba Shan and;the Sichuan basin, China: Implication for Architecture of the Daba Shan
	Zhang Jisheng 1; Gao Rui 1; Li Qiusheng 1; Guan Ye 1; Wang Haiyan 1; Li Wenhui 1
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2013
卷号	87 期号:4 页码:1154-1161
关键词	Daba Mountains nappe structural belt Sichuan basin gravity anomaly magnetic anomaly crystalline basement
ISSN号	1000-9515
DOI	10.1111/1755-6724.12117
英文摘要	The Dabashan nappe structural belt links the Hannan block to the west with the Huangling block to the east between Yangxian and Xiangfan. The Dabashan arc-shaped fold belt formed during late Jurassic and was superposed on earlier Triassic folds. To achieve an improved understanding of the deep tectonics of the Dabashan nappe structural belt, we processed and interpreted the gravity and magnetic data for this area using new deep reflection seismic and other geophysical data as constraints. The results show that the Sichuan basin and Daba Mountains lie between the Longmenshan and Wulingshan gravity gradient belts. The positive magnetic anomalies around Nanchong-Tongjiang-Wanyuan-Langao and around Shizhu result from the crystalline basement. Modeling of the gravity and magnetic anomalies in the Daba Mountains and the Sichuan basin shows that the crystalline basement around Nanchong-Tongjiang-Wanyuan-Langao extends to the northeast underneath the Wafangdian fault near Ziyang. The magnetic field boundary in the Zhenba-Wanyuan-Chengkou-Zhenping area is the major boundary of the Dabashan nappe thrusting above the Sichuan Basin. This boundary might be the demarcation between the south Dabashan and the north Dabashan structural elements. The low gravity anomaly between Tongjiang and Chengkou might be partly caused by thickened lower crust The local low gravity anomaly to the south of Chengkou-Wanyuan might result from Mesozoic strata of low density in the Dabashan foreland depression area.
学科主题	地球物理勘探
WOS关键词	FORMATION MECHANISM ; FORELAND
WOS研究方向	Geology
语种	英语
出版者	WILEY-BLACKWELL
WOS记录号	WOS:000323744100020
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40089]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 2.Minist Land & Resources, Earthprobe & Geodynam Open Lab, Beijing 100037, Peoples R China.
推荐引用方式 GB/T 7714	Zhang Jisheng,Gao Rui,Li Qiusheng,et al. Characteristic of Gravity and Magnetic Anomalies in the Daba Shan and;the Sichuan basin, China: Implication for Architecture of the Daba Shan[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2013,87(4):1154-1161.
APA	Zhang Jisheng,Gao Rui,Li Qiusheng,Guan Ye,Wang Haiyan,&Li Wenhui.(2013).Characteristic of Gravity and Magnetic Anomalies in the Daba Shan and;the Sichuan basin, China: Implication for Architecture of the Daba Shan.ACTA GEOLOGICA SINICA-ENGLISH EDITION,87(4),1154-1161.
MLA	Zhang Jisheng,et al."Characteristic of Gravity and Magnetic Anomalies in the Daba Shan and;the Sichuan basin, China: Implication for Architecture of the Daba Shan".ACTA GEOLOGICA SINICA-ENGLISH EDITION 87.4(2013):1154-1161.