Fábrica del cuarzo en tectonitas de alta temperatura (Manto de Ojén, Cordilleras Béticas)
DOI:
https://doi.org/10.3989/egeol.85413-4699Keywords:
Plastic deformation, [c] axis patterns, subboundaries, intracrystalline slip, shear sense.Abstract
The homogeneous migmatites of the Ojén nappe (Western Alpujarrides, Malaga) are intensely mylonitized simultaneously to the tectonic emplacement of the Ronda peridotites. This plastic deformation is produced at high temperatures (~750ºC), according to the mineralogy, microstructures and quartz [e] axis diagrams of mylonites. Several quartz [c] axis diagrams are like those type II crossed-girdles (Lister y Williams, 1979). The geometry of these patterns and the presence of basal subboundaries (┴ [c]) optically perceptibles in XZ section, suggest that the intracrystalline [c] slip acts together with the classic <a> slip. This hypothesis allows a kinematic analysis of those patterns in terms of simple shear in according to the regional shear sense.
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