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True three-dimensional trishear; a kinematic model for strike-slip and oblique-slip deformation

Ernesto O. Cristallini, Laura Giambiagi and Richard W. Allmendinger
True three-dimensional trishear; a kinematic model for strike-slip and oblique-slip deformation
Geological Society of America Bulletin (August 2004) 116 (7-8): 938-952

Abstract

Most structural/kinematic models are inherently two-dimensional; even several recent three-dimensional models are "pseudo-three-dimensional" in that they consist of a series of parallel two-dimensional cross sections. Lack of a true three-dimensional formulation hampers our abilities to simulate three-dimensional structures such as oblique- and strike-slip faulting and displacement gradients perpendicular to the slip vector. The mathematical formulation of trishear deformation using incompressibility of flow is well suited to a solution in three dimensions. We derive one plausible velocity field for true three-dimensional flow in a triangular shear zone. This formulation allows us to simulate the deformation in oblique-slip deformation zones as well as flower structures associated with strike-slip fault zones. The strain distribution in flower structures combined with some simple mechanical assumptions suggests that faults in these zones would have a helicoidal geometry. The results of the kinematic model compare well to well-described structures in the Colorado Plateau, Andaman Sea, and Death Valley, as well as to data from analog experiments.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 116
Serial Issue: 7-8
Title: True three-dimensional trishear; a kinematic model for strike-slip and oblique-slip deformation
Affiliation: Consejo Nacional de Investigaciones Cientificas y Tecnicas, Buenos Aires, Argentina
Pages: 938-952
Published: 200408
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 25
Accession Number: 2004-057849
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
N05°00'00" - N17°00'00", E92°30'00" - E98°00'00"
N32°30'00" - N42°00'00", W124°30'00" - W114°15'00"
N33°40'00" - N40°30'00", W114°00'00" - W106°19'60"
Secondary Affiliation: Cornell University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200417
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