A granulite-facies normal shear zone exposed in the Arunta inlier of central Australia: Implications for deep-crustal deformation during oblique divergence

Cheryl Waters-Tormey; Laurel B. Goodwin; Basil Tikoff; Kathy Staffier; Paul Kelso

doi:10.1130/2009.2456(10)

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A granulite-facies normal shear zone exposed in the Arunta inlier of central Australia: Implications for deep-crustal deformation during oblique divergence

Author(s)

Cheryl Waters-Tormey

Department of Geosciences and Natural Resources, Western Carolina University, Cullowhee, North Carolina 28723, USA

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Laurel B. Goodwin

Department of Geology and Geophysics, University of Wisconsin–Madison, Wisconsin 53706, USA

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;

Basil Tikoff

Department of Geology and Geophysics, University of Wisconsin–Madison, Wisconsin 53706, USA

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;

Kathy Staffier

Department of Geology and Geophysics, University of Wisconsin–Madison, Wisconsin 53706, USA

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;

Paul Kelso

Department of Geology and Physics, Lake Superior State University, Sault Ste. Marie, Michigan 49783, USA

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Doi:

https://doi.org/10.1130/2009.2456(10)

Published:

January 01, 2009

The Mount Hay block is a ~12-km-thick, deep continental crustal section exposed in the Arunta inlier in central Australia. The ~4-km-wide, granulite-facies (770–776 ± 38 °C) Capricorn ridge shear zone cross-cuts the dominant granulite-facies fabric of the Mount Hay block. In its present geometry, the Capricorn ridge shear zone contains a steeply south-southeast-dipping foliation, steeply east-southeast-plunging lineation, and south-side-up shear-sense indicators. When post-granulite-facies tilting is removed, the shear zone restores to a shallowly to moderately (30–50°) dipping, normal shear zone in which the lineation is oblique to the inferred Proterozoic plate boundary, suggesting oblique divergence. The field observations and reconstruction...

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GSA Special Papers

Crustal Cross Sections from the Western North American Cordillera and Elsewhere: Implications for Tectonic and Petrologic Processes

Author(s)

Geological Society of America

Volume

456

DOI:

https://doi.org/10.1130/SPE456

Attribution:You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). Noncommercial - you may not use this work for commercial purpose. No Derivative works - You may not alter, transform, or build upon this work. Sharing - Individual scientists are hereby granted permission, without fees or further requests to GSA, to use a single figure, a single table, and/or a brief paragraph of text in other subsequent works and to make unlimited photocopies of items in this journal for noncommercial use in classrooms to further education and science.

ISBN print:

9780813724560

Publication date:

January 01, 2009

A granulite-facies normal shear zone exposed in the Arunta inlier of central Australia: Implications for deep-crustal deformation during oblique divergence

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Contents

Crustal Cross Sections from the Western North American Cordillera and Elsewhere: Implications for Tectonic and Petrologic Processes

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A granulite-facies normal shear zone exposed in the Arunta inlier of central Australia: Implications for deep-crustal deformation during oblique divergence

Figures & Tables

Contents

Crustal Cross Sections from the Western North American Cordillera and Elsewhere: Implications for Tectonic and Petrologic Processes

GeoRef

References

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