Maximum effective moment criterion and the origin of low-angle normal   faults

doi:10.1016/S0191-8141(03)00079-8

CORC > 北京大学 > 地球与空间科学学院

	Maximum effective moment criterion and the origin of low-angle normal faults
	Zheng, YD ; Wang, T ; Ma, MB ; Davis, GA
刊名	journal of structural geology
	2004
关键词	low-angle normal fault extensional crenulation cleavage maximum effective moment criterion METAMORPHIC CORE COMPLEX DUCTILE SHEAR ZONES KINK-BANDS TECTONIC IMPLICATIONS CRENULATION CLEAVAGE KINEMATIC ANALYSIS DETACHMENT FAULTS ANISOTROPIC ROCKS SOUTHERN MONGOLIA MECHANICAL MODEL
DOI	10.1016/S0191-8141(03)00079-8
英文摘要	The origin of the low-angle normal faults of metamorphic core complexes has been debated for over two decades. Proponents of Andersonian fault mechanics have long argued that it is mechanically unfeasible for slip to occur along shallowly dipping normal faults. A new theory, named the maximum effective moment criterion, is proposed here for their origin. Using an effective moment approach formulated as M-eff = FH, where F is the force tangentially acting on the unit shear boundaries and H represents its arm. The maximum value appears at angles of +/-54.7degrees with the sigma(1). Since extensional crenulation cleavages (eccs) and the contractional crenulation cleavages (cccs) occur in conjugate pairs with similar to110degrees angle between them, it is suggested that they tend to be oriented in the directions of maximum effective moment. The differential stress for formation of the ecc or ccc are less than that for fracturing. The orientations of conjugate eccs depending on relative magnitudes of simple shear versus coaxial strain components. The synthetic ecc set is much better developed than the antithetic set due to anisotropy. Upward propagation of the synthetic ecc set from mid-crustal domains of mylonitization through strain localization and strain softening is considered an effective mechanism for the formation of the low angle-normal faults of metamorphic core complexes. Published by Elsevier Science Ltd.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000220644500007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geosciences, Multidisciplinary; SCI(E); EI; 41; ARTICLE; 2; 271-285; 26
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/156107]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zheng, YD,Wang, T,Ma, MB,et al. Maximum effective moment criterion and the origin of low-angle normal faults[J]. journal of structural geology,2004.
APA	Zheng, YD,Wang, T,Ma, MB,&Davis, GA.(2004).Maximum effective moment criterion and the origin of low-angle normal faults.journal of structural geology.
MLA	Zheng, YD,et al."Maximum effective moment criterion and the origin of low-angle normal faults".journal of structural geology (2004).