Geological atlas of western and central Europe

Plate tectonic evolution of the southern margin of Eurasia in the Mesozoic and Cenozoic

Dynamic processes controlling evolution of rifted basins

Climatically controlled river terrace staircases: A worldwide Quaternary phenomenon

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Baltica from the late Precambrian to mid-Palaeozoic times: The gain and loss of a terrane's identity

https://research.vu.nl/ws/files/74427570/6750

Late Precambrian to Triassic history of the East European Craton: dynamics of sedimentary basin evolution

Geological history of the East-Barents Sea region in the Palaeozoic-Mesozoic according the data of computer modelling.

Geological evolution of the eastern barents sea region in the paleozoic and mezosoic as inferred from computer-aided modeling

Late Mesozoic and Cenozoic geodynamics of the Arctic region is discussed in the context of possible mechanisms which provide multistage cyclic transformations and transport of carbon through crust and mantle. Geodynamic processes control the abiogenic generation of hydrocarbons and the patterns of their localization. Possible mechanisms of abiotic hydrocarbon generation are explained in the context of carbon transport from subduction zones to rifts and serpentinization of ultramafic rocks in the rifts in the case of the Laptev Sea and Gakkel Ridge areas. The carbon of shallow crust origin migrates with encapsulated fragments of marine sediments which are consumed in the Pacific subduction zone where they become destroyed and transformed by different chemical and physical processes. The resulting C-species are involved in mantle convection flows and reach the continental rifts of the Laptev Sea and the Gakkel mid-ocean ridge. Thus, the hydrocarbons formed in the crust and in the mantle acquire signatures of abiotic origin. According to the authors, the scale of manifestation of abiogenic methanogenesis in the lower parts of the lithosphere and in the upper mantle is not so wide. Numerous small (mm and fractions of the mm) particles of exogenous matter and dispersed carbon pulled into the mantle can only form a stable crustal geochemical plume that propagates in the plane of movement of convective flows. Indirectly, the scale of manifestation of this process can be judged by the volumes of degassing of hydrocarbon and carbon dioxide gases, as well as hydrogen and its compounds in the rift systems of the earth’s crust, which are extremely insignificant. However, in the cold seas of the Eastern Arctic, massive emissions of bubble methane of mixed genesis were found. As shown in the literature, the range of variability of stable isotopes of carbon and 14C of methane in certain areas of discharge associated with rifting demonstrates values (anomalously heavy 13C, and young 14C) that can be considered as examples of presumably abiogenic origin. Our work is mostly theoretical and suggests further discussion and improvement of the mechanism of formation of abiogenic hydrocarbons and the processes of their transformation.

/pdf/late-mesozoic-and-cenozoic-geodynamics-of-the-arctic-region-q7wcoiu3.pdf

Late Mesozoic and Cenozoic Geodynamics of the Arctic Region: Implications for Abiogenic Generation of Hydrocarbons

Based on the results of studies of basaltoid rocks of Western Svalbard (Nordenskiold Land), the features of their geotectonic position and distribution over stratigraphic complexes of the sedimentary cover are considered. Some characteristics of the geochemical composition of rocks are given. The age range of magmatism manifestation is estimated on the basis of radiological dating and in comparison with the arch. Franz Josef Land. In the context of the data obtained, considerations are made about the geodynamic conditions of the formation of the Barents Sea magmatic province.

/pdf/on-the-characteristics-of-the-early-cretaceous-platobasalt-3nr0otz9.pdf

E.V. Shipilov

Papers

Late Precambrian to Triassic history of the East European Craton: dynamics of sedimentary basin evolution

Geological history of the East-Barents Sea region in the Palaeozoic-Mesozoic according the data of computer modelling.

Geological evolution of the eastern barents sea region in the paleozoic and mezosoic as inferred from computer-aided modeling

Late Mesozoic and Cenozoic Geodynamics of the Arctic Region: Implications for Abiogenic Generation of Hydrocarbons

On the characteristics of the early cretaceous platobasalt magmatism of Svalbard (Nordenskiold Land)