地质论评2017，Vol.63Issue(2)：287-301,15.DOI:10.16509/j.georeview.2017.02.003
里德尔剪切的组合型式与走滑盆地组合型式的相似性
The Similarity between Riedel Shear Patterns and Strike-slip Basin Patterns
摘要
Abstract
Objectives:The importance of strike-slip faulting was recognized near the turn of the century.Riedel shear patterns are commonly observed in the strike-slip fault systems.The basins related to Riedel shear are also documented in different tectonic settings in the world.This paper reviews the characteristics and evolution of Riedel shears in terms of mechanism of simple shear.Based on the data of the core samples at the centimeter scale and the published data about sedimentary basins in nature,the aim of this paper is to propose some patterns of sedimentary basin related to Riedel shears.Results:Three evidences show that the Riedel shear pattern is similar to the faulted basin pattern in a strikeslip fault zone.① The pattern of Riedel shears is not dependent on the scale observed.The extensional (transtensional) zones in the small strike-slip faults are similar to the basin distributions along large fault zone;② The depocenter along a fault is the same as the location of maximum fault displacement;The basins commonly show elongated form as the faults.③The basins related to Riedel shears can be reproduced by physical and numerical experiments.Based on above factors,we proposed six patterns of sedimentary basin related to Riedel shears:en echelon basin,horsetail basin,beaded basin,S-type (Z-type) basin,ζ-type basin,and complicated lattice basin.① The width of en echelon basins increases with the increase of shear displacement in the principal shear zone.② Geometry of horsetail basins and brush basins are similar to each other.The horsetail basins are generally found in the extensional tip zones of a strike-slip fault,whereas the brush basins develop in any place in a shear zone.③ Beaded basins are formed due to extension of releasing zones in the braided strike-slip fault.Individual basin is in the form of lenses.④ Z-type basins are formed due to sinistral shear and S-type basins are formed due to dextral shear.⑤ ζ-type basins are typical pattern of pull-apart basins in the case of Ls/Ln ＜1,whereas for Ls/Ln ＞＞1,the beaded pattern is expected,where Ls is the transfer length of a pull-apart basin and Ln is the spacing between two en echelon fault segments.⑥ Lattice basins are developed in the distributed shear zones with anastomosing faults.Conclusions:Observations at the centimeter scale show considerable variation in the orientation of synthetic and antithetic Riedel shears relative to a shear zone.Many types of Riedel shear are formed at the centimeter scale.By complying our observations and the published data about the sedimentary basins in nature,we proposed six patterns of the sedimentary basins and their structures relative to the Riedel shears developed in nature.关键词
里德尔剪切/走滑盆地/拉分盆地/构造组合/盆地组合类型Key words
Riedel shear/strike-slip basin/pull-apart basin/tectonic pattern/basin pattern引用本文复制引用
许顺山,彭华,Angel F.NIETO-SAMANIEGO,陈书平,吴习东..里德尔剪切的组合型式与走滑盆地组合型式的相似性[J].地质论评,2017,63(2):287-301,15.基金项目
本文为墨西哥自然基金资助项目(编号:08967)和中国石油化工股份有限公司石油勘探开发研究院项目(编号:GSYKY-B09-32)的成果.This study was supported by the projects of PAPIIT of UNAM (No.08967) and No.GSYKY-B09-32 of China Petroleum & Chemical Cooperation. （编号:08967）
