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 69
- Downloads 0
Litho-facial models of Pirallahi field’s oil deposits on geophysical well logging data
Performed work aims to recreate the formation conditions of the basic lithotypes of geological section and construction of petrophysical models of medium on several horizons of Productive series on the basis of processi...
Preliminary results of dating for the Lower Paleolitic sites of Ukraine (Medzhibozh 1 and Medzhibozh A, Khmelnitskii region) by electron spin resonance method
In the West of Ukraine, the Medzhibozh site complex includes two multi-layered open-air Lower Paleolithic sites sitting at 49°35′ N 27°42′ E, 270 m amsl. In Medzhibozh I’s lower alluvial cycle, Layer 16a yielded Paleolit...
Correction of velocity profile by the method of imitation of annealing
Reversal of hodograph in 2D formulation, obtained by finite-difference solution of eikonal has been put into practice by the method of imitation of «annealing» in the problem of combinatorial optimization for uneven and...
Investigation of micro-seismic phenomena of anthropogenic origin
The results of measurements of parameters of macroseismic effects in the mine “Artem-1” “ArselorMittal Krivoy Rog” at a depth 1005m that accompany changes in the state of the rock mass have been considered. Frequency sp...
Long-time changes of the thermal continentality index; the amplitudes and the phase of the seasonal temperature variation in Ukraine
Special features of spatial-temporal variations of continentality indices Gorczynsky and Johanson—Ringleb as well as an amplitude and phase of the seasonal change of temperature in the territory of Ukraine under conditio...