Formation of olivine pseudo - Crescumulates by syntectonic axial planar growth during mantle deformation
By: Christiansen, F.G
.
Contributor(s): Roberts, S.
Material type: 
ArticleDescription: 73-79pp ; Illustration.Subject(s): Arabian peninusula | Igneous rocks | Nesosilicates | Olivine group | Ophiolite | Orthosilicates | Crescumulate textures | Vourinos complex - Greece
In:
Geological magazine : Vol. 123 Iss. 1-6 Year. 1986Summary: 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.
| Item type | Current location | Collection | Call number | Status | Date due | Barcode |
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Article
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Library and Information Centre Periodical Section | Bound Journal Collection | Not for loan | 002533_07 | ||
Serials/Scientific Journal
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Library and Information Centre Periodical Section | Bound Journal Collection | 550 GEO (Browse shelf) | Available | 002533 |
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.
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