Density heterogeneity of the Earth’s crust of the Black Sea megadepression and adjacent territories from three-dimensional gravity modelling. 1. Regional density distribution at different depths.

Abstract

Введение. Анализ ранее опубликованных работ по двух-и трехмерному плотностному моделированию земной коры Черного моря показал, что во всех построенных моделях используются одни и те же карты мощности разновозрастных осадочных отложений, приведенных, на

Contrasting lithospheric geophysical structure of the Black Sea subbasins: Relevance to testing geotectonic models for this mega depression

“…Deep faults, including strike-slips, do not participate in the constructions. The differentiated nature of β-factors distribution in the EBSB correlates with the heterogeneous density at the Moho section and the basaltic type of the crust in the center of the subbasin [Makarenko et al, 2021].…”

“…In addition, as a continuation of the fault in the Western and Central Pontides, it should cross the Western subbasin in the central part. Our comprehensive studies on the fault tectonics of the crystalline crust [Rusakov, Pashkevich, 2017] showed that such a meridional strike-slip does not manifest itself either in potential fields or in the 3D density model of the crystalline crust [Makarenko et al, 2021]. Spadini G. et al [1996] put forward an innovative idea that pre-rift contrast lithospheric structure controls Black Sea formation.…”

“…45,2023 such an assessment is the Moho relief and the thickness of the crystalline crust. The type of crust or its basicity can be predicted from the results of 3D gravity modeling, taking into account velocity models [Makarenko et al, 2021]. As an oceanic type of crust, a consolidated crust is considered, consisting entirely of a conventionally identified basalt layer.…”

“…The aim of this work is to analyze the data on the parameters of the modern BSB lithosphere obtained by us [Starostenko et al, 2015] and other researchers [Nikishin et al, 2015;Tsvetkova et al, 2017;Makarenko et al, 2021] in terms of their use as indicators of age and driving mechanisms of subbasin opening.…”

“…However, deep penetration regional seismic data from the international project Geology without limits revealed the areas of highly rifted continental crust within these domains in the deep Black Sea basins. According to 3D gravity modeling data [Makarenko et al, 2021], this type of crust can be developed only in separate blocks in the Western subbasin and is much more widespread in the Eastern one. Here it covers almost the entire subbasin.…”