Microstructure and Fabric Transitions in Calcite Tectonites from the Sierra Alhamilla.

Behrmann, Jan H. (1983) Microstructure and Fabric Transitions in Calcite Tectonites from the Sierra Alhamilla. Open Access Geologische Rundschau, 72 (2). pp. 605-618. DOI 10.1007/BF01822084.

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Abstract

A suite of marble specimens from the Sierra Alhamilla (Spain), deformed to large strains under natural conditions at about 300° C shows distinct variations in microstructure and fabrics. It can be demonstrated that the development of crystallographic preferred orientations and grain shape fabrics are strongly dependent on recrystallized grain size. This is interpreted to reflect the relative importance of various deformational mechanisms. Superplasticity seems to have a sharp upper grain size limit at 10–15 /smm. Within the power law creep regime, deformation in fine grained aggregates is probably dominated by diffusional, in coarser ones by dislocation mechanisms. The transition is a gradual one, and may span a grain size range of 30 /sm.

Document Type: Article
Keywords: Spain, Sierra Alhamilla, marble, microstructure, fabrics, deformation
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/BF01822084
ISSN: 0016-7835
Date Deposited: 27 Nov 2012 09:39
Last Modified: 17 Jan 2018 10:00
URI: http://oceanrep.geomar.de/id/eprint/19324

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