By D J Prior, E H Rutter, D J Tatham
This selection of papers provides contemporary advances within the examine of deformation mechanisms and rheology and their functions to tectonics. a few of the contributions take advantage of new petrofabric concepts, really electron backscatter diffraction, to assist comprehend the evolution of rock microstructure and mechanical homes. Papers within the first part (lattice hottest orientations and anisotropy ) exhibit a turning out to be emphasis at the selection of elastic homes from petrofabrics, from which acoustic houses might be computed for comparability with in-situ seismic measurements. Such learn will underpin geodynamic interpretation of large-scale energetic tectonics. Contributions within the moment part (microstructures, mechanisms and rheology) examine the family members among microstructural evolution in the course of deformation and mechanical homes. a number of the papers discover how assorted mechanisms compete and have interaction to manage the evolution of grain dimension and petrofabrics. members utilize combos of laboratory experiments, box stories and computational equipment, and several other relate microstructural and mechanical evolution to large-scale tectonic procedures saw in nature.
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Extra resources for Deformation Mechanisms, Rheology and Tectonics: Microstructures, Mechanics and Anisotropy (Geological Society Special Publication 360)
Figs 5 & 6). Indeed, it is the absence of foliation that results in the distinctive seismic responses of amphiboles and particularly micas for constrictional deformations. Modelling seismic properties of ductile continental crust This section considers the implications of the results presented above for the explanation and interpretation of the seismic properties of the ductile continental crust using the CPO-derived seismic properties (specifically Vp, AVp and AVs) of the four rock samples described previously.
In summary, significant AVp and AVs values observed in the ductile middle to lower continental crust are due to either mica (felsic) and/or amphibole (mafic hydrous) lithologies. Furthermore, relatively low or intermediate values of anisotropy could also be due to pyroxene (mafic anhydrous) lithologies. It will therefore be difficult and/or impossible to distinguish between contrasting felsic and mafic compositions and/or conditions using seismic anisotropy profiling observations alone. g. g. Figs 1 & 8).
Deformation fabrics, mica and seismic properties of the continental crust. Earth & Planetary Sciences Letters, 288, 320 –328. Lloyd, G. , Halliday, J. , Butler, R. W. , Wookey, J. & Mainprice, D. 2011. From crystal to crustal: petrofabric derived seismic modelling of regional tectonics. In: Prior, D. , Rutter, E. H. & Tatham, D. J. (eds) Deformation Mechanisms, Rheology and Tectonics: Microstructures, Mechanics and Anistropy. Geological Society, London, Special Publications, 360, 49–78. McSkimin, H.