Geophysical processes and biosphere: article

Аnnotation: The construction of density models of the earth's crust and upper mantle along a system of profiles crossing Eurasia and North America, the Atlantic and Pacific oceans, transition zones between continents and oceans is considered. In the crust, they are built according to velocity sections along the DSS profiles. Density sections were recalculated as anomalous in relation to the density of the upper platform mantle. The calculated gravitational effect from such models in areas with zero observed field is minus 870 mG. This value was established experimentally on the East European platform, where the geological and geophysical knowledge is maximum. The author's ideas about deep-seated processes are used for the upper mantle. They are associated with variants of heat and mass transfer under various endogenous regimes. Based on the results of these processes, the temperature distributions were determined, which distinguish the densities of mantle rocks in each region from platform ones. The gravitational effects calculated for such anomalous models are summed up with crustal ones. Regions with all types of endogenous regimes have been studied: platforms, zones of recent activation, geosynclines and rifts of different ages, mid-ocean ridge, ocean depressions, marginal trough, island arc, back-arc depression. The total is matched against the observed fields. In all the regions studied, the differences obtained do not exceed those explained by the errors of observations and calculations. Thus, the construction of density models of the tectonosphere is becoming one of the methods for verifying the used schemes of deep processes.