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Information × Registration Number 0201U001487, 0196U004632 , R & D reports Title Mechanisms and ways of magmatic melt migration through the tectonosphere in connection with tectogenesis phenomena and solution of practical geological problems. popup.stage_title Head Guterman V. G., Registration Date 07-02-2001 Organization Institute of Geophysics by S.I.Subbotin name (Division of Geodynamics of Explosion). popup.description2 The aim of the project was to study physical mechanisms and tectonic consequences of the melt migration through the upper mantle and the Earth's crust. The investigations were performed in the three directions. (1) A thermal instability in the upper mantle was studied on an example of Transeuropean activization zone. A model of asthenolenses formation was proposed that is based on the experimental fact of existence of melt-solid density crossover at ambient pressure 8-10 GPa. (2) The conditions of equilibrium of fluid driven cracks is studied in terms of the Dugdale-Barenblatt model. It is shown that equilibrium conditions depend critically on ratio of a crack lenth to the so called critical length. The derived analitical solutions are valid in the case of high lithospheric pressure. (3) The deformations resulted from the intrusion of a crustal sill are calculated. The conditions of sill propagation and the rupture of the sill roof accomponied by a seismic event are studied. The process of a crust s il l propagation is studied by means of physical modeling on centrifugated models. Product Description popup.authors popup.nrat_date 2020-04-02 Close