TECTONOPHYSICAL CRITERIA FOR FORECASTING THE LOCATIONS OF QUARTZ CRYSTAL DEPOSITS (CASE OF SUBPOLAR URAL)
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 bloc...
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| Format: | Article |
| Language: | English |
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Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust
2020-03-01
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| Series: | Геодинамика и тектонофизика |
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| Online Access: | https://www.gt-crust.ru/jour/article/view/982 |
| _version_ | 1797855725452525568 |
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| author | L. A. Sim |
| author_facet | L. A. Sim |
| author_sort | L. A. Sim |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-09T20:27:51Z |
| format | Article |
| id | doaj.art-976abc08de004c9e9ea7bb48d3a10305 |
| institution | Directory Open Access Journal |
| issn | 2078-502X |
| language | English |
| last_indexed | 2024-04-09T20:27:51Z |
| publishDate | 2020-03-01 |
| publisher | Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust |
| record_format | Article |
| series | Геодинамика и тектонофизика |
| spelling | doaj.art-976abc08de004c9e9ea7bb48d3a103052023-03-30T20:08:04ZengRussian Academy of Sciences, Siberian Branch, Institute of the Earth's crustГеодинамика и тектонофизика2078-502X2020-03-01111313810.5800/GT-2020-11-1-0460458TECTONOPHYSICAL CRITERIA FOR FORECASTING THE LOCATIONS OF QUARTZ CRYSTAL DEPOSITS (CASE OF SUBPOLAR URAL)L. A. Sim0O.Yu. Schmidt Institute of Physics of the Earth of RASSpatial 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.https://www.gt-crust.ru/jour/article/view/982subpolar uraltectonic stressvariation of the type of stress state (vtss)quartz veinquartz crystal |
| spellingShingle | L. A. Sim TECTONOPHYSICAL CRITERIA FOR FORECASTING THE LOCATIONS OF QUARTZ CRYSTAL DEPOSITS (CASE OF SUBPOLAR URAL) Геодинамика и тектонофизика subpolar ural tectonic stress variation of the type of stress state (vtss) quartz vein quartz crystal |
| title | TECTONOPHYSICAL CRITERIA FOR FORECASTING THE LOCATIONS OF QUARTZ CRYSTAL DEPOSITS (CASE OF SUBPOLAR URAL) |
| title_full | TECTONOPHYSICAL CRITERIA FOR FORECASTING THE LOCATIONS OF QUARTZ CRYSTAL DEPOSITS (CASE OF SUBPOLAR URAL) |
| title_fullStr | TECTONOPHYSICAL CRITERIA FOR FORECASTING THE LOCATIONS OF QUARTZ CRYSTAL DEPOSITS (CASE OF SUBPOLAR URAL) |
| title_full_unstemmed | TECTONOPHYSICAL CRITERIA FOR FORECASTING THE LOCATIONS OF QUARTZ CRYSTAL DEPOSITS (CASE OF SUBPOLAR URAL) |
| title_short | TECTONOPHYSICAL CRITERIA FOR FORECASTING THE LOCATIONS OF QUARTZ CRYSTAL DEPOSITS (CASE OF SUBPOLAR URAL) |
| title_sort | tectonophysical criteria for forecasting the locations of quartz crystal deposits case of subpolar ural |
| topic | subpolar ural tectonic stress variation of the type of stress state (vtss) quartz vein quartz crystal |
| url | https://www.gt-crust.ru/jour/article/view/982 |
| work_keys_str_mv | AT lasim tectonophysicalcriteriaforforecastingthelocationsofquartzcrystaldepositscaseofsubpolarural |