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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 57 (1973)

Issue: 1. (January)

First Page: 97

Last Page: 116

Title: Newport-Inglewood Trend, California--An Example of Wrenching Style of Deformation

Author(s): T. P. Harding (2)

Abstract:

The structure of the Newport-Inglewood producing trend of the Los Angeles basin, California, is a subsurface structural-style example of a relatively small-displacement wrench zone. A variety of data substantiates strike-slip displacements and, together with the similarities to experimentally produced deformation patterns, supports the use of this feature as a wrench model. The structural style consists of a single alignment of anticlinal culminations, arranged in a right-handed en echelon pattern, which are offset along the trend's median line by right-lateral en echelon strike-slip faults. Fold axes and other structural elements are displaced laterally 600-2,500 ft. In this deformation the operation of both extension and compression, and the overlap pattern of the en ec elon strike-slip faults caused complex secondary faulting. Terminal horsting, en echelon thrusts, en echelon normal faults, steeply dipping horst and graben slices, and coexisting normal- and reverse-separation faults augment the basic style. These structural patterns are proposed as a model to depict and interpret wrench-related structuring in other areas with similar deformation.

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