Dynamic recrystallization of quartz: correlation between natural and experimental conditions.

Stipp, Michael, Stünitz, Holger, Heilbronner, Renée and Schmid, Stefan M. (2002) Dynamic recrystallization of quartz: correlation between natural and experimental conditions. In: Deformation Mechanisms, Rheology and Tectonics: Current Status and Future Perspectives. , ed. by de Mer, S.. Geological Society Special Publications, 200 . Geological Society of London, London, pp. 171-190. DOI 10.1144/GSL.SP.2001.200.01.11.

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Quartz veins in the Eastern Tonale mylonite zone (Italian Alps) were deformed in strike-slip shear. Due to the synkinematic emplacement of the Adamello Pluton, a temperature gradient between 280°C and 700°C was effected across this fault zone. The resulting dynamic recrystallization microstructures are characteristic of bulging recrystallization, subgrain rotation recrystallization and grain boundary migration recrystallization. The transitions in recrystallization mechanisms are marked by discrete changes of grain size dependence on temperature. Differential stresses are calculated from the recrystallized grain size data using paleopiezometric relationships. Deformation temperatures are obtained from metamorphic reactions in the deformed host rock. Flow stresses and deformation temperatures are used to determine the strain rate of the Tonale mylonites through integration with several published flow laws yielding an average rate of approximately 10−14s−1 to 10−12s−1. The deformation conditions of the natural fault rocks are compared and correlated with three experimental dislocation creep regimes of quartz of Hirth & Tullis. Linking the microstructures of the naturally and experimentally deformed quartz rocks, a recrystallization mechanism map is presented. This map permits the derivation of temperature and strain rate for mylonitic fault rocks once the recrystallization mechanism is known.

Document Type: Book chapter
Keywords: Quartz, dynamic recrystallization, Eastern Tonale mylonite zone (Italian Alps)
Open Access Journal?: No
DOI etc.: 10.1144/GSL.SP.2001.200.01.11
Date Deposited: 02 Dec 2015 09:39
Last Modified: 02 Dec 2015 09:40
URI: http://oceanrep.geomar.de/id/eprint/30410

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