Abstract
The paper presents the results of investigations of deformed natural polycrystalline olivine. The relationship of the structure of polycrystalline olivine grains to three modal size distributions has been revealed. Grains of different size were observed to be strained at threshold temperatures of 950, 775, and 650°C. It has been demonstrated that the microstructure develops as the dislocation mechanism changes from diffusion creep to grain boundary sliding. The changes in deformation mechanisms promote the change in the preferred crystallographic orientations of olivine from type A to type D and then to type B. The relation of the transitions between different types of orientations to the conditions of deformation in the lower layers of the lithosphere at the plate boundaries is discussed.
Highlights
Olivine is considered an important indicator of the deformation regime of the lower layers of the lithosphere that carry information about the stress pattern of the crust–mantle interface
Dunites are characterized by high plasticity, which occurs at temperatures ranging between 400 and 2000°C and pressures ranging between 0.3 and 20 GPa [3,4,5,6]. These parameters vary with rock occurrence depth and characterize the state of different layers of the lithosphere
The investigations performed have shown that the formation of olivine grains of three modal sizes in the test deformation system occurred at three threshold temperatures: 950, 775, and 650°C
Summary
Olivine is considered an important indicator of the deformation regime of the lower layers of the lithosphere that carry information about the stress pattern of the crust–mantle interface. Information of this kind can serve to gain insight into the stress relaxation mechanisms that underlie seismic events [1, 2]. Dunites are characterized by high plasticity, which occurs at temperatures ranging between 400 and 2000°C and pressures ranging between 0.3 and 20 GPa [3,4,5,6] These parameters vary with rock occurrence depth and characterize the state of different layers of the lithosphere. To gain an understanding of the mechanisms of plastic deformation of olivine is of considerable scientific importance
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