Anisotropy of elastic properties of mountain rocks in high thermodynamic conditions and petrophysical models of lithosphere
Ibragim B. Safarov
Series of new apparatus and methodics have been developed, which allow to measure velocities of longitudinal and transversal waves simultaneously and also density properties of mountain rocks and minerals at one sample in high thermodynamic conditions. Methodics have been made and definitions of high pressure have been developed for research of velocities of longitudinal and polarized transversal waves on oriented samples of anisotropic mountain rocks and minerals during one experiment process.
Elastic properties, density and elastic anisotropy of velocities of longitudinal and transversal waves of mountain rocks and minerals have experimentally been studied. They are the representatives of continental and oceanic lithosphere and also deep inclusions - xenolites from volcanic pipe in high thermodynamic conditions. Dependence of velocities of longitudinal and transversal waves has been got and also dependence of modulus of elasticity anisotropy of elastic properties from mineral content and structure, density, porosity. The peculiarities of chemical content influence upon elastic and density properties of mountain rocks have been recognized, which are in lithosphere of continents and oceans depending on thermodynamic conditions. Anisotropy of polarized transversal waves has been defined according to mentioned methodics in oriented samples of anisotropic mountain rocks and minerals. On the base of experimentally obtained velocities values of longitudinal and transversal waves and also densities in high thermodynamic parameters the following points are determined; compressibility, decrement of volume, Young modulus and shift, Poisson ratio for numerous deep rocks and xenolites. It has been defined compressibility reduces while depth of rocks increases. Mantle eclogites and ultrabasites are characterized by minimal values. According to obtained experimental data a full tensor of elastic constants of diopside has been estimated under pressure up to 2,0 GPa. There is a correlation relation between physical parameters of mountain rocks in wide interval of pressure and temperature.
Construction methodics of deep petrophysical models of sections has been developed on base of geological-geophysical field materials and laboratory experimental results for mountain rocks under high thermodynamic parameters. With temperature correlation matter content of continental (Sibirian platform, Pamirs, Tien Shan, Talysh zone) and oceanic (Pacific ocean, Cyprus isl., the Urals, L.Caucasus, Mediterranean and Japan seas) area of lithosphere has been defined.