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Texture asymmetries as shear sense indicators in naturally deformed mono- and polyphase carbonate rocks

Leiss, B.ORCIDiD
Siegesmund, S.
Weber, K.
Journal: Textures and microstructures, 1999
33, 1/4: 61 - 74
DOI: https://doi.org/10.1155/TSM.33.61
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/6741
Leiss, B.; Siegesmund, S.; Weber, K., 1999: Texture asymmetries as shear sense indicators in naturally deformed mono- and polyphase carbonate rocks. In: Textures and microstructures, Band 33, 1/4: 61 - 74, DOI: 10.1155/TSM.33.61.
 
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  • Abstract
The microstructural and quantitative texture analyses of a naturally deformed calcite mylonite, a dolomite mylonite and a dolomitic calcite mylonite reveal different texture asymmetries for comparable deformation conditions. Calcite shows a c-axis maximum rotated against the shear sense with regard to the main shear plane. In contrast, the dolomite shows a c-axis maximum rotated with the shear sense. In accordance with the experimental and simulated textures from the literature, this difference proves e-twinning and r-slip for calcite and f-twinning and c-slip for dolomite as the main deformation mechanisms. The dolomitic calcite mylonite shows for both the calcite and the dolomite a c-axis maximum rotated against the shear sense. On account of the microstructure of this sample, the dolomite texture has been passively overtaken from the deformation texture of calcite during a late-deformative dolomitization. The results significantly contribute to the interpretation that the sampled shear zone is a transpressive strikeslip fault.
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