Rheology of fine-grained siliciclastic rocks in the middle crust-evidence from structural and numerical analysis [rapid communication]

Details Rheology of fine-grained siliciclastic rocks in the middle crust-evidence from structural and numerical analysis [rapid communication] Rheology of fine-grained siliciclastic rocks in the middle crust-evidence from structural and numerical analysis [rapid communication]

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005e%26psl.233..351k&link_type=abstract

Earth and Planetary Science Letters, Volume 233, Issue 3-4, p. 351-360.

Mathematics

Logic

10

Scientific paper

Constitutive models to describe the rheology of the crust are based on a combination of indirect methods, and many aspects are still unknown and controversial. Here we present a new method to quantify the rheology of fine-grained siliciclastic rocks, which are common in the middle crust and deform by solution-precipitation processes. We use a combination of structural analysis at different scales and a geomechanical model, to develop a parameter estimation scheme to calculate rheological parameters at 350 400 °C and geologic strain rates. The results of this study demonstrate that fine-grained siliciclastic rocks in the middle crust have a Newtonian viscous rheology, approximately 10 times weaker than wet quartz. This is in agreement with observed microstructures. Our results imply that the strength of polyphase quartz-rich rocks located in the middle crust is much lower than predicted by conventional models based on flow laws for dislocation creep. Because fine-grained siliciclastic rocks control the rheology of the middle crust in many sedimentary basins, our results provide new quantitative parameters for geodynamic modelling in settings where dissolution-precipitation creep is important.

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