Experimental study of decompression, permeability and healing of silicate rocks in fault zones

Медведев, В. Я.; Лысов, Б. А.; Ruzhich, V. V.; Марчук, М. В.

doi:10.5800/gt-2014-5-4-0162

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…volumes with minimum density) in rapid decompressed pumice 29 . General subvertical dip of ore bodies and concentric differentiation of south part of the deposit is similar to rapidly decompressed, partly crystallized ore melt 30 , 31 . Vortex-like structures are also typical for decompressed solid-gas columns, e.g.…”

Section: Discussionmentioning

confidence: 86%

Approach of automatic 3D geological mapping: the case of the Kovdor phoscorite-carbonatite complex, NW Russia

Kalashnikov

Ivanyuk

Mikhailova

et al. 2017

Sci Rep

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We have developed an approach for automatic 3D geological mapping based on conversion of chemical composition of rocks to mineral composition by logical computation. It allows to calculate mineral composition based on bulk rock chemistry, interpolate the mineral composition in the same way as chemical composition, and, finally, build a 3D geological model. The approach was developed for the Kovdor phoscorite-carbonatite complex containing the Kovdor baddeleyite-apatite-magnetite deposit. We used 4 bulk rock chemistry analyses – Femagn, P2O5, CO2 and SiO2. We used four techniques for prediction of rock types – calculation of normative mineral compositions (norms), multiple regression, artificial neural network and developed by logical evaluation. The two latter became the best. As a result, we distinguished 14 types of phoscorites (forsterite-apatite-magnetite-carbonate rock), carbonatite and host rocks. The results show good convergence with our petrographical studies of the deposit, and recent manually built maps. The proposed approach can be used as a tool of a deposit genesis reconstruction and preliminary geometallurgical modelling.

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Section: Discussionmentioning

confidence: 86%

Approach of automatic 3D geological mapping: the case of the Kovdor phoscorite-carbonatite complex, NW Russia

Kalashnikov

Ivanyuk

Mikhailova

et al. 2017

Sci Rep

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“…This ensures filling the cavities with new minerals, including ore. This is the hydrothermal mechanism of mineral "healing" of fault segments in the upper part of the earth's crust at relatively low pressures and temperatures [25].…”

Section: Geological Study Of Exhumed Seismic Dislocations Of Paleo-eamentioning

confidence: 99%

A New Method for Seismically Safe Managing of Seismotectonic Deformations in Fault Zones

Ruzhich

Shilko

2020

Springer Tracts in Mechanical Engineering

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The authors outline the results of long-term interdisciplinary research aimed at identifying the possibility and the methods of controlling tangential displacements in seismically dangerous faults to reduce the seismic risk of potential earthquakes. The studies include full-scale physical and numerical modeling of P-T conditions in the earth’s crust contributing to the initiation of displacement in the stick-slip regime and associated seismic radiation. A cooperation of specialists in physical mesomechanics, seismogeology, geomechanics, and tribology made it possible to combine and generalize data on the mechanisms for the formation of the sources of dangerous earthquakes in the highly stressed segments of faults. We consider the prospect of man-caused actions on the deep horizons of fault zones using powerful shocks or vibrations in combination with injecting aqueous solutions through deep wells to manage the slip mode. We show that such actions contribute to a decrease in the coseismic slip velocity in the fault zone, and, therefore, cause a decrease in the amplitude and energy of seismic vibrations. In conclusion, we substantiate the efficiency of the use of combined impacts on potentially seismically hazardous segments of fault zones identified in the medium-term seismic prognosis. Finally, we discuss the importance of the full-scale validation of the proposed approach to managing the displacement regime in highly-stressed segments of fault zones. Validation should be based on large-scale tests involving advanced technologies for drilling deep multidirectional wells, injection of complex fluids, and localized vibrational or pulse impacts on deep horizons.

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“…The spectra measured by a single-collector mass spectrometer Noblegas 5400 and a multi-collector mass spectrometer Argus are shown in grey and black, respectively. ней является упомянутая выше датировка по мусковиту, возникшему, вероятнее всего, в декомпрессионной трещине растяжения типа pull-apart, которые обычно возникают при высокоскоростных сдвиговых сейсмодислокациях при резком сбросе давления, что было показано в экспериментах [Medvedev et al, 2014]. Предполагается, что она согласуется с 40 Ar/ 39 Ar датировками синтектонических слюд, возникших на этапе проявления сдвиговых деформаций при эволюционном развитии Приморского разлома в зоне коллизионного шва [Travin, 2016].…”

Section: оценка возраста косейсмических разрывов и глубины эксгумацииunclassified

On the structure and formation of earthquake sources in the faults located in the subsurface and deep levels of the crust. Part II. Deep level

Ruzhich

Kocharyan

Savelieva

et al. 2018

Geodin. tektonofiz.

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In the part 2 of the study [Ruzhich, Kocharyan, 2017, we aimed at identifying the elements of paleoearthquake sources in the crust, which formed at the hypocentral depths in the exhumed Primorsky segment of the ancient collisional suture. The study area covered the southeastern margin of the Siberian craton (Pribaikalie, East Siberia). Slickensides, pseudo-tachyllite (basaltic glass) and other petrological evidence of intensive tectonic movements were sampled. The structure of the deep segments of the collisional suture were reconstructed from on the data on coseismic ruptures and faults, and the PT parameters were estimated. In the past decades, similar research problems were actively investigated (e.g. [Sibson, 1973;Byerlee, 1978;Morrowetal., 1992;Hodges, 2004;Kirkpatricketal., 2012). In Russia, the interest in studying geological and geophysical features of the deeply denuded areas in ancient faults is still limited [Sherman, 1977;Ruzhich, 1989, 1992, 1997;Savel’eva et al., 2003;Ruzhich et al., 2015; Kocharyan, 2016. The deeply denuded Primorsky segment of the collisional suture of the Siberian Craton underwent the geological evolution of a billion years. In the analysis, we used additional geological data from the petrology studies of the Main Sayan fault zone and other exhumed fault segments, including the seismogenerating faults in the Mongolia-Baikal region [Zamaraev,Ruzhich, 1978;Zamaraev et al., 1979;Ruzhich et al., 2009. From the PT conditions for the occurrence of the slickensides, pseudo-tachylyte, and the Primorsky segment structure, the40Ar/39Ar method estimated the age of the slickensides containing tourmaline at 673±4.8 Ma, which may correspond to the Neoproterozoic stage of the breakdown of the megacontinent Rodinia. Another dating, 415.4±4.1 Ma, obtained for the muscovite sample from a decompressional rupture, refers to the Early Paleozoic stage in the development of the collisional suture, when accretion of the Siberian Craton and the Olkhon terrain took place [Donskaya et al., 2003;Fedorovsky et al., 2010. Based on these ages and other available petrological data, the depths of the heterochronous systems of coseismic ruptures were estimated:18 km in the Neoproterozoic, and12 km in the Middle Paleozoic stage of the seismotectonic evolution of the crust in Pribaikalie. The deep paleoseismological settings need to be further investigated in order to more thoroughly clarify the physical and chemical conditions that contributed to the occurrence of the ancient and recent sources of strong earthquakes in the deep segments of faults in the crust. Such information is a prerequisite for further progress towards resolving the problems of securing seismic safety in various regions.

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Experimental study of decompression, permeability and healing of silicate rocks in fault zones

Cited by 5 publications

References 4 publications

Approach of automatic 3D geological mapping: the case of the Kovdor phoscorite-carbonatite complex, NW Russia

Approach of automatic 3D geological mapping: the case of the Kovdor phoscorite-carbonatite complex, NW Russia

A New Method for Seismically Safe Managing of Seismotectonic Deformations in Fault Zones

On the structure and formation of earthquake sources in the faults located in the subsurface and deep levels of the crust. Part II. Deep level

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