Fault development and interaction in distributed strike-slip shear zones: an experimental approach

Schreurs, Guido (2003). Fault development and interaction in distributed strike-slip shear zones: an experimental approach. Geological Society Special Publications, 210(1), pp. 35-52. Geological Society 10.1144/GSL.SP.2003.210.01.03

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Analogue model experiments using both brittle and viscous materials were performed to investigate the development and interaction of strike-slip faults in zones of distributed shear deformation. At low strain, bulk dextral shear deformation of an initial rectangular model is dominantly accommodated by left-stepping, en echelon strike-slip faults (Riedel shears, R) that form in response to the regional (bulk) stress field. Push-up zones form in the area of interaction between adjacent left-stepping Riedel shears. In cross sections, faults bounding push-up zones have an arcuate shape or merge at depth. Adjacent left-stepping R shears merge by sideways propagation or link by short synthetic shears that strike subparallel to the bulk shear direction. Coalescence of en echelon R shears results in major, through-going faults zones (master faults). Several parallel master faults develop due to the distributed nature of deformation. Spacing between master faults is related to the thickness of the brittle layers overlying the basal viscous layer. Master faults control to a large extent the subsequent fault pattern. With increasing strain, relatively short antithetic and synthetic faults develop mostly between old, but still active master faults. The orientation and evolution of the new faults indicate local modifications of the stress field. In experiments lacking lateral borders, closely spaced parallel antithetic faults (cross faults) define blocks that undergo clockwise rotation about a vertical axis with continuing deformation. Fault development and fault interaction at different stages of shear strain in our models show similarities with natural examples that have undergone distributed shear.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Schreurs, Guido

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0305-8719

Publisher:

Geological Society

Language:

English

Submitter:

Guido Schreurs

Date Deposited:

18 Jul 2016 14:20

Last Modified:

18 Jul 2016 14:20

Publisher DOI:

10.1144/GSL.SP.2003.210.01.03

URI:

https://boris.unibe.ch/id/eprint/83596

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