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Formation of olivine pseudo-crescumulates by syntectonic axial planar growth during mantle deformation

Published online by Cambridge University Press:  01 May 2009

F. G. Christiansen  and
S. Roberts
F. G. Christiansen
Affiliation:
Department of Geology, University of Aarhus, DK-8000, Denmark
S. Roberts
Affiliation:
Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes, MK6 7AA, U.K.
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Abstract

Large elongated euhedral olivines, resembling olivines appearing in crescumulates, from dunite bodies of ophiolite mantle sequences have been subjected to a detailed structural and fabric study. Localities from the Semail Ophiolite, Oman and the Vourinos Complex, Greece are described. The studies indicate that the regional mantle flow structures control the shape and crystallographic orientation of the large euhedral olivines, which are elongated parallel to [001] and flattened parallel to (100) due to syntectonic high temperature metamorphic growth. The growth is controlled by the deformation such that grains oriented unsuitable for slip are growing whereas grains with other orientations are selectively deformed. This being so there may be more than one interpretation of crescumulate textures developed in environments that have suffered a penetrative deformation.

Type
Articles
Information
Geological Magazine , Volume 123 , Issue 1 , January 1986 , pp. 73 - 79
Copyright
Copyright © Cambridge University Press 1986

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