Mametova L.F. The mineral katagenesis and deformations as the key factors impacting on the rock geomechanical properties

Details

Parent Category: Geo-Technical Mechanics, 2016

Category: Geo-Technical Mechanics, 2016, Issue 130

Geoteh. meh. 2016, 130, 53-62

THE MINERAL KATAGENESIS AND DEFORMATIONS AS THE KEY FACTORS IMPACTING ON THE ROCK GEOMECHANICAL PROPERTIES
 Mametova L.F. 
IGTM NAS of Ukraine

UDC 552.08:622.02:539.2/.8

Abstract. The research results of mineral transformation in the rocks of Donbass coalfields are presented in the article. Sandstones samples of medium carbon from the G-grade coal spreading areas in peripheral areas of the region were studied. In the course of optical and other researches, difference between intensity of geochemical transformations and microstrain of essential minerals in the western and eastern sediments was determined. Geochemical and structural changes of the sandstone minerals are similar in these areas, but there are a number of signs indicating an impulsive nature of tectonic movements and different stress intensity, which is higher in the east and lower in the southwest. The first sing is an established differentiation between microstrain types spreading in the rockforming minerals. Combinations of the quartz elastic deformations are more complex in the east. The second sign is that temperature gradient in the east is higher due to the hidden magma centres and "thermal domes", which speed up changes in the feldspars and carbonates and affect the katagenesis. The third sign is that in result of deformations, mineral structural defects are opened and morphology of cavitated microspace changes. In conditions of the rock uneven volumetric compression, width and length of the cracks opening inside and between the mineral grains increases. These processes affect the state of the rock mass.

Keywords: Donbass, sandstones, katagenesis, minerals, deformations, quartz.

REFERENCES

1. Fayf, U.S., Prays, N. and Tompson, A. (1981), Flyuidy v zemnoy kore [Flyuidy in earthly barks], Translated by Smolin P.P., Mir, Moskоw, USSR.

2. Baranov, V.A. (1989), "Micro disturbance of quartz sandstones of Donbass in connection with their outburst", Abstract of Ph.D. (Geol.-Min), Dnepropetrovsk, Ukraine.

3. Privalov, V.A. (2005), "Tectonothermal evolution of the Donets Basin", Abstract of D.Sc. (Geol), Dnepropetrovsk, Ukraine.

4. Derevska, K.I. (2007). "Paleogeotermal mode of litogenez sedimentary-pedigree pools of passive outskirts of continent", Shumlianskyi L.V. (ed), Zbirnyk naukovykh prats Itstytutu fundamentalnykh doslidzhen, pp. 68-83.

5. Yushkin, N.P. (1971) Mekhanicheskie svoystva mineralov [Mechanical properties of minerals], Nauka, Leningrad, USSR.

6. Yurel, G.N., Stavrogin, A.N. and Ivanova, N.I. (1986), "Microconversion sandstones lithogenetic various types of high pore pressures", Lytologyya and useful minerals, no. 6, pp. 100-112.

7. Lukin, A.E. (1990), "Genetic types of secondary transformation and oil and gas pools in aulacogens", Geological journal, no. 1, pp. 102-111.

8. Derevska, K.I., Shumlianskyi, V.O. and Novik, V.A. (2002), "Postdiagenetic of changing of Carboniferous rocks on the stage of inversion and hypogene ore formations in Donbass", Aspekty geologii metalevykh i nemetalevykh korysnykh kopalyn: zb. nauk. prats IGN NANU, vol. 1, pp. 55-72.

9. Christie, J.M. and Ardell, A.J. (1979), "Deformation structures in minerals", in Wenk H.-R., Champness P.E., Christi J.M., Cowley J.M., Heuer A.H., Thomas G., Tighe N.J. (ed.), Electron microscopy in mineralogy,
pp. 363-391.

10. Mametova, L.F. (2012), „Mykrodislocation' minerals and breeds as reflection of dynamycgeoheskykh deformations" / Nelineynyuye geomekhniko-geodinamicheskie protsessy pri otrabotke mestorozhdeniy poleznyukh iskopaemykh na bolshykh glubinakh [Nonlinear geomekhanyko-geodynamycheskye processes at working off the deposits of minerals on large depths], Novosibirsk, Russia, 2-5 July 2012, pp. 273-278.

11. Aleksandrov, O.L., Derevska, К.І. and Shumlianskyi, V.O. (2011), "Hidden intrusion central Donetsk folded region and their relationship with hydrothermal mineralization", Geological journal, no. 4, pp. 33-41.

About the authors:

Mametova Liudmyla Fedorivna, Candidate of Geology (Ph.D.), Senior Researcher in Laboratory of Researches of the Structural Changes in the Rock in Department of Geology of Coal Beds at Great depths, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

• < Prev
• Next >