Mechanism of Formation of Active Margins

The upper mantle material is strongly heated beneath active margins as compared to stable continental and oceanic areas. The energy associated with its abnormal heating is by two orders of magnitude higher than any energetic effects of subduction. This hot material has been injected from a large depth, most likely from the core-mantle boundary. Low-velocity and low-density mantle material is segregated from the hot upper mantle beneath active margins. It forms a layer several tens of kilometers thick beneath the lithosphere. Oceanic lithosphere is denser than anomalous mantle and it sinks into anomalous mantle layer. Heavy eclogite is forming in the oceanic crust after it contacts anomalous mantle. This permits the subduction to occur along an inclined boundary between normal mantle of high viscosity and hot light material of low viscosity located beneath active margins. Deep depressions of marginal seas are formed by the basalt-eclogite transition after the contact of low-velocity mantle with the continental crust in a number of regions. Local centers of sea floor spreading can arise depressions when low-velocity mantle temperature is very high under the crust

Accelerated non-linear destruction of the earth's crust

The upper part of the Earth—the lithospheric layer, ∼100 km thick, is rigid. Segments of this spherical shell–lithospheric plates are drifting over a ductile asthenosphere. On the continents, the lithosphere includes the Earth's crust, ∼40 km thick, which is underlain by peridotitic rocks of the mantle. In most areas, at depths ∼20–40 km the continental crust is composed of basalts with density ∼2900kg m−3. At temperature and pressure typical for this depth, basalts are metastable and should transform into another assemblage of minerals which corresponds to garnet granulites and eclogites with higher densities 3300–3600 kg m−3. The rate of this transformation is extremely low in dry rocks, and the associated contraction of basalts evolves during the time ≥108 a. To restore the Archimede's equilibrium, the crust subsides with a formation of sedimentary basins, up to 10–15 km deep

Physical Origin of Crustal Movements on Passive Margins

Passive margins of the continents are usually forming after a break-up continental plates. The break-up results from the accumulation of a hot low-velocity and low-density mantle beneath the crust along the belt crossing a continental plate. Heat flow from the low-velocity mantle into the crust strongly reduces the lithosphere thickness down to 20-30 km. Isostatic uplift occurs over the low-velocity mantle lense which produces high tensile stresses in the lithosphere of about several kilobars. After the break-up, cooling of the crust and of the low-velocity mantle is accompanied by vertical crustal subsidence. The following isostatic crustal sinking may be produced by the load of sediments. The width of the area subsided on a passive margin depends on the capability of lower crust to undergo the phase transition and on the initial width of the low-velocity mantle belt beneath the crust before the break-up of the continent. Certain regions can subside before the continental break-up as a consequence of basalt-eclogite transition in the basaltic layer of continental crust

CHANGES OF REGULATORY SYSTEM ADAPTIVE STATUS OF PATIENTS AFTER APPLICATION OF DIFFERENT APPROACHES FOR MYOMECTOMY

Aim. To reveal the quantity changes of the regulatory system adaptive status of patients after different approaches for myomectomy.Materials and methods. Myomectomy was performed in the 2ndRegionalClinicalHospital by three different approaches: laparotomic, laparoscopic and hysteroresectoscopic. The heart rate variability was evaluated by time and spectral parameters.Results. There was revealed that the decrease of heart rate variability is more significantly expressed after laparotomic myomectomy than after laparoscopic myomectomy. The least expressed change of the regulatory system adaptive status was observed in patients after hysteroresectoscopy.Conclusion. The parameters of heart rate variability allow estimating the functional adaptive status in patients with myoma of uterus who underwent different surgical treatment

EXPERIENCE OF USING SELECTIVE UTERINE ARTERY EMBOLIZATION IN THE TREATMENT OF CERVICAL PREGNANCY

The problem of treatment of cervical pregnancy refers to the topical issues of modern gynecology. Existing methods of radical surgical treatment leads to permanent loss of reproductive function of patients. The development of endovascular surgery techniques has allowed to minimize the amount of surgical intervention and preserve the reproductive potential of patients. During the work process was analyzed the experience of the treatment of cervical pregnancy with selective embolization of the uterine arteries at the base of the gynecological department of 2nd Regional Clinical Hospital. These results allow us to recommend this method for the treatment of this form of ectopic pregnancy gynecological hospitals