Evolution of melts and fluids as a reflection of the crust and mantle formation by the example of the Middle Denieper mega-block of the Ukrainian Shield. Archean
Journal Title: Геофизический журнал - Year 2016, Vol 38, Issue 2
Abstract
The scheme of geodynamic process during the production of granite-greenstone area (GGA) of the Middle Dnieper mega-block (MDMB) of the Ukrainian Shield has been presented. It reflects the change of the lithosphere thickness during activation lasted from 3.2 to 2.8 Ga ago. Composition of fluids accompanied melts differentiation within the mantle and crust has also been described. Special features of chemical and mineral composition of the greenstone rocks structures of the Middle Dnieper mega-block are wide development of magnesia silicates and high content of iron. Peculiarities of composition of superposed alterations reflect the activity of oxidized fluids car¬bonate, aqueous and silicate ones. These special features are inherent to all GSS of the Archean without any exclusion and practically are never repeated later. It is possible to explain this fact by high oxidation potential at the depths of more than 100 km and water and chloride ions activity at higher levels. Granitoids and ferruginous rocks are formed during integrated geodynamic process with volcanogenic rocks of the greenstone rocks structures.
Authors and Affiliations
O. V. Usenko
Keywords
Related Articles
- EP ID EP197849
- DOI -
- Views 92
- Downloads 0
Is it right to divide geodynamics into global geotectonics and global geodynamics?
Is it right to divide geodynamics into global geotectonics and global geodynamics?
The tectonic condition formed of ore-structures of the Peri-Azovian megablock of the Ukrainian Shield (at the examples fo Dibrovska)
According to previous studies, the structural pattern of the eastern part of the Ukrainian shield, which was formed during several stages of essentially landslide transformations of crystalline base¬ment, corresponds to...
Possibility of the use of data of infrasonic monitoring for identification of the nature of seismic events
The paper considers the possibility of the use of infrasound measurements conducted in Ukraine to verify the recorded seismic events and the use of infrasound data as one of the criteria for their identification. Registr...
Kinematic evolution of the Pieniny Klippen Belt in Cenozoic (Ukrainian Carpathians)
The data on surface, subsurface and deep structure of the Pieniny Klippen Belt (PKB) have been summarized and new results of its geological-structural and fault kinematic studies within the Ukrainian part of the Eastern...
Alternatives of «shale scenario» of development of the Russian fuel and energy complex on the basis of the deep oil paradigm of petroleum geology
The condition and ways of the decision of the basic problems of modern petroleum geology in the field of recovery of resources of hydrocarbon and searches of oil and gas fields are discussed. Problems of efficiency, stra...