Some methodological aspects of tectonic stress reconstruction based on geological indicators

Sim, L. A.

doi:10.1016/j.crte.2011.11.003

Cited by 4 publications

(7 citation statements)

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“…This model is consistent with most of the previously proposed models of fault zones [11,[16][17][18][19][20][21]33,69]. Tectonophysical studies usually result in detecting variations of the parameters of the stress-strain field, which, in its turn, makes it possible to reconstruct the sequence of changes in deformations [3][4][5][6][7][8][9][10][11][12]. At the microscale, this issue can be resolved by studying fluid inclusion planes (FIPs) as tectonic indicators of changing stress-strain fields [23,27,48,49].…”

Section: Discussionsupporting

confidence: 89%

“…One of the main tasks of tectonophysics and structural geology is to establish the hierarchical rank of tectonic stress fields from local [1][2][3] and subregional [4,5] to regional [6][7][8] and global [9][10][11][12] ones. Depending on the tasks being solved and the scale of the objects under study, various methods from microstructural and petrophysical analyses to numerical methods of continuum mechanics and physical modeling are used [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Prospects of Geoinformatics in Analyzing Spatial Heterogeneities of Microstructural Properties of a Tectonic Fault

et al. 2022

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The paper proposes a special technique for microstructural analysis (STMA) of rock samples based on two provisions. The first one is an algorithm for the automatic detection and digitalization of microstructures in images of oriented thin sections. The second one utilizes geographic information system (GIS) tools for an automatized analysis of objects at the micro scale. Using STMA allows the establishment of geometric features of fissure and pore space of rock samples to determine the parameters of stress–strain fields at different stages of rock massif deformation and to establish a relationship between microstructures and macrostructures. STMA makes it possible to evaluate the spatial heterogeneity of physical and structural properties of rocks at the micro scale. Verification of STMA was carried out using 15 rock samples collected across the core of the Primorsky Fault of the Baikal Rift Zone. Petrographic data were compared to the quantitative parameters of microfracture networks. The damage zone of the Primorsky Fault includes three clusters characterized by different porosity, permeability, and deformation type. Findings point to the efficiency of STMA in revealing the spatial heterogeneity of a tectonic fault.

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Prospects of Geoinformatics in Analyzing Spatial Heterogeneities of Microstructural Properties of a Tectonic Fault

et al. 2022

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“…Это объясняется тем, что обсуждаемый максимум обусловлен частым совпадением оси сжатия локальных стресс-состояний с массовыми смещениями по плоскостям рассланцевания, отраженными на рис. 2, в, которые характеризуются минимальным трением изза наличия на плоскостях рассланцевания слюдистых минералов [Sim, 2012]. Выбор более крутой ориентации оси сжатия обусловлен тем, что в пределах Кожимского поднятия доминируют ЛСС с крутой ориентировкой оси сжатия.…”

Section: результаты исследований и их обсуждениеunclassified

Tectonophysical criteria for forecasting the locations of quartz crystal deposits (case of Subpolar Ural)

Sim

2020

Geodin. tektonofiz.

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Spatial reconstruction of tectonic stresses within the Subpolar Ural quartz crystal-containing province was conducted by the kinematic method [Gushchenko, 1973, 1979] based on the main indicators of tectonic stresses on slickensides. Local stress states (LSS) and general stress fields for large blocks were reconstructed by the method described in [Sim, Marinin, 2015]. In the blocks with numerous occurrences of quartz crystal (Pelingichey and Omega-Shor blocks), the general stress fields is characterized by a stress state close to uniaxial tension, i.e. the Lode-Nadai coefficient µ=–1. In these blocks, thick quartz veins are perpendicular to the tension axis of the general stress field. In the block without quartz crystal (West Saled), the general stress field is characterized by a triaxial stress state or pure shear state (–1˂µσ˂+1). The LSS of the quartz crystal deposits show the following: the stress state of µ=–1 is typical of quartz veins without quartz crystal nests, and a special kind of stress state is reconstructed near the nests with piezoelectric material. It is named a variation of the type of stress state (VTSS), which means that within one tectonic stage, the type of stress state changes approximately as follows: µσ=+1 (40 %), µσ=–1 (40 %), and –1˂µσ˂+1. It means that in the piezoelectric mineral deposits, pulsating tectonic stresses provided for a fluid flow of hydrothermal solutions at the intersection of ore-bearing and ore-controling faults when tension (µ=–1) was replaced with compression (µ=+1), while the orientations of compression and tension axes remained unchanged. Apparently, such a regime was caused by alternating activation of the above-mentioned faults. The tectonic stress reconstructions were performed for 33 mineral deposits and occurrences of quartz crystal. VTSS was determined in 32 deposits; one mineral occurrence is characterized by uniaxial tension. Therefore, we propose using VTSS (variation of the type of stress state) as a criterion for predicting the locations of quartz crystal deposits.

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“…Отмечены также случаи, когда большинство плоскостей с бороздами скольжения формируется на плоскостях, параллельных оси растя жения. Этот феномен, вероятно, связан с тем, что та кие плоскости минимально раскрыты при одноосном растяжении и изза большего трения на них, чем на прочих плоскостях, борозды на них видны лучше [Sim, 2012]. Перечисленные особенности приводят к выводу о том, что при выделении сопряженных сколовых трещин велика вероятность ошибки нахождения псев досопряженных пар сколовых трещин.…”

Section: реконструкция палеонапряжений по бороздам скольженияunclassified

“…Так, были исследованы разные этапы деформирования эльджур тинских гранитов (этапы обоснованы по геологиче ским данным) [Vasilyev et al, 2002]; на основании изу чения складок в детачменте Воронцовского покрова и тектонических напряжений кинематическим методом было показано, что покров образовался в результате гравитационного перемещения горных пород [Yakov lev, Sim, 2007]; проведено сопоставление результатов тектонофизических исследований по геологическим индикаторам, проведенных разными методамиструктурнопарагенетическим и методом Ж. Анжелье (рис. 7) [Marinin, Saintot, 2008, 2012. Сравнение ре зультатов, полученных двумя независимыми группами исследователей, показало, что в пределах складчатого сооружения СевероЗападного Кавказа преобладают субгоризонтальные ориентировки максимальных сжи мающих напряжений; наиболее четко из них проявле но северовосточное (до север-северовосточного) на правление, с действием которого связано формирова ние основных позднеальпийских структур региона; поле напряжений, связанное с север-северозападным сжатием, было проявлено на позднейшем этапе разви тия района.…”

Section: выделение фаз в едином цикле деформированияunclassified

Overview of the state of knowledge on paleotectonic stresses and their implications for solution of geological problems

Sim¹

2013

Geodyn. Tectonophys.

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The most informative geological indicators of tectonic stress are faults on all scales and minor structural forms, such as dikes, mineralized veins, shear fractures, cleavage, slikenlines on slip planes of any genesis, foliation, cleavage, stilo lite joints, hinges and axial planes of folds and flexures, etc. These indicators are analysed by various field tectonophysical methods developed in different countries. The article gives an overview of the history of the most widely used methods of tectonophysical paleotectonic stress reconstructions for geological structures of various scales. Reviewed are results of re gional tectonophysical studies aimed at mapping paleotectonic stress and solution of possible mechanisms of formation of the structures located mainly in the territory of Russia and CIS countries. Special attention is given to application of results of the tectonic stress studies for solution of practical problems.

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Some methodological aspects of tectonic stress reconstruction based on geological indicators

Cited by 4 publications

References 1 publication

Prospects of Geoinformatics in Analyzing Spatial Heterogeneities of Microstructural Properties of a Tectonic Fault

Prospects of Geoinformatics in Analyzing Spatial Heterogeneities of Microstructural Properties of a Tectonic Fault

Tectonophysical criteria for forecasting the locations of quartz crystal deposits (case of Subpolar Ural)

Overview of the state of knowledge on paleotectonic stresses and their implications for solution of geological problems

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