Theory and practice of the maximum effective moment criterion (MEMC)

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	Theory and practice of the maximum effective moment criterion (MEMC)
	Zheng, Yadong ; Wang, Tao ; Wang, Xinshe
刊名	北京大学学报自然科学版
	2007
英文摘要	Conjugate fractures have an acute angle to ??1, while conjugate deformation zones with an obtuse angle to it. The acute angle can be explained with the Mohr-Coulomb criterion, whereas the obtuse one can be elucidated with the maximum effective moment criterion (MEMC), which is recently proposed. The MEMC is mathematically expressed as Meff = 0.5(??1-??3) L ?? sin2?? sina, where ??1-??3 represents the yield strength of the related rock, L is a unit length and a is the angle between a, and deformation bands. This criterion demonstrates that the maximum value appears at angles of ??54.7?? to ??1, and there is little difference in the moment in the range of 55?? ?? 10??. The range covers all the observations available from nature and experiments. In practice, it can be used for elucidate many geological structures such as kink-bands and extensional crenulation cleavages, yield zones in evaporates, low-angle normal faults and high-angle reverse faults, lozenge ductile shear zones in basement terranes, some crocodile structures in seismic profiles and detachment folds in foreland basins. It may be used to determine the stress state when the related deformation features formed and provides a new approach to determine the Wk of the related ductile shear zone. It can also be extended to explain the relationship between orogenic and late-orogenic extension events, and uplift and exhumation of ultrahigh pressure rocks that experienced deep subduction.; EI; 0; 2; 145-156; 43
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/312257]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zheng, Yadong,Wang, Tao,Wang, Xinshe. Theory and practice of the maximum effective moment criterion (MEMC)[J]. 北京大学学报自然科学版,2007.
APA	Zheng, Yadong,Wang, Tao,&Wang, Xinshe.(2007).Theory and practice of the maximum effective moment criterion (MEMC).北京大学学报自然科学版.
MLA	Zheng, Yadong,et al."Theory and practice of the maximum effective moment criterion (MEMC)".北京大学学报自然科学版 (2007).