Puzzles and the maximum-effective-moment (MEM) criterion in structural   geology

doi:10.1016/j.jsg.2011.06.004

CORC > 北京大学 > 地球与空间科学学院

	Puzzles and the maximum-effective-moment (MEM) criterion in structural geology
	Zheng, Yadong ; Zhang, Jinjiang ; Wang, Tao
刊名	journal of structural geology
	2011
关键词	MEM-Criterion Low-angle normal fault High-angle reverse fault Wide-open V-shaped conjugate strike-slip faults Strain-rate ANGLE NORMAL FAULTS SHEAR-ZONE VORTICITY ANALYSIS NW CHINA CRENULATION CLEAVAGE DUCTILE DEFORMATION NATURAL EXAMPLE SAMBAGAWA BELT NE BRAZIL SW JAPAN
DOI	10.1016/j.jsg.2011.06.004
英文摘要	The essential difference in the formation between conjugate brittle shear fractures and ductile shear zones is that the intersection angle of conjugate faults in the contractional quadrants in the former is acute (usually similar to 60 degrees) and obtuse (usually 110 degrees) in the latter. The Mohr-Coulomb failure criterion is an experimentally validated empirical relationship, which structural geologists use to interpret the stress directions based on the orientation of the brittle shear fractures. However, a simple application of this criterion assuming that the principal stresses are vertical or horizontal throughout the crust fails to explain crustal scale low-angle normal faults, high-angle reverse faults and certain types of conjugate strike-slip faults that have intersection angles in the compressional quadrants greater than 90 degrees. Although the Maximum-Effective-Moment (MEM) criterion has been used to analyze structures in several natural cases and obtained some new evidence in nature and experiments, it is not yet commonly used to interpret non-Mohr-Coulomb features widely distributed in the crust. It is important to review the MEM criterion and its implications for explaining the formation mechanism of naturally occurring faults and shear zones. Behavior of a rock depends on its mechanical properties; the latter in turn depends on pressure and temperature conditions related to crustal depth and strain rates. Conjugate fractures with obtuse angles, ca. 110 degrees, in the contractional direction at different scales and at different crustal levels are consistent with the prediction of the MEM criterion and suggest deformation at low strain rates. Thus, strain-rate clearly plays an important role in the style of crustal deformation and the many observed departures from the Mohr-Coulomb failure criterion. (C) 2011 Elsevier Ltd. All rights reserved.; Geosciences, Multidisciplinary; SCI(E); EI; 0; ARTICLE; 9; 1394-1405; 33
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155769]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zheng, Yadong,Zhang, Jinjiang,Wang, Tao. Puzzles and the maximum-effective-moment (MEM) criterion in structural geology[J]. journal of structural geology,2011.
APA	Zheng, Yadong,Zhang, Jinjiang,&Wang, Tao.(2011).Puzzles and the maximum-effective-moment (MEM) criterion in structural geology.journal of structural geology.
MLA	Zheng, Yadong,et al."Puzzles and the maximum-effective-moment (MEM) criterion in structural geology".journal of structural geology (2011).