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Li Y.-B.,China University of Mining and Technology | Li Y.-B.,Key Laboratory of Coalbed Methane Resources and Reservoir Forming Ministry of Education | Jiang B.,China University of Mining and Technology | Jiang B.,Key Laboratory of Coalbed Methane Resources and Reservoir Forming Ministry of Education
Meitan Xuebao/Journal of the China Coal Society | Year: 2015

The tectonically deformed coal samples (TDC) were collected from Sulin coalfield, Anhui Province, to investigate the sulfur distribution and occurrence mechanism. In the study, the sulfur content was determined. Combining with the microstructures and typical mineral observation, the sulfur migration enrichment mechanism was discussed. The results show that the sulfur content of different TDC from Sulin coalfield varies greatly, mainly with organic sulfur and sulfate sulfur. Consistent with the regional variation on the vertical formation, the sulfur migration pattern is from a high stress area to a low one on the plane, which is controlled by the Xisipo thrust fault. According to the structure of coal formation mechanism, three types of sulfur distribution can be identified, i.e. weak brittle, strong brittle and ductile deformation, which are closely related to the deformation degree of TDC. The gypsum is a major mineral in the TDC from the Sulin coalfield, with granular, flake, fragmental and fissure filling in different brittle TDC, and the mineral morphology is correlated with the stress and strain conditions. Sulfate sulfur content is controlled by the tectonism. The pyrite morphologic features vary in different TDC, and four formation stages and 11 types are divided. Organic sulfur content progressively decreases with the deformation degree of TDC. Tectonic stress, especially the shear stress, modifies the coal structure and provides the impetus to organic sulfur migration at the same time. It concludes that the sulfur content is controlled by sedimentation at a diagenesis phase, the migration and enrichment laws are influenced by the tectonic stress and metamorphic deformation in the late tectonic movement and present the tectonic-dynamic differentiation phenomenon of sulfur. ©, 2015, China Coal Society. All right reserved.


Li M.,China University of Mining and Technology | Li M.,Key Laboratory of Coalbed Methane Resources and Reservoir Forming Ministry of Education | Li M.,University of Waterloo | Jiang B.,China University of Mining and Technology | And 5 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2011

Based on the observation of geologic structure in field and coal mine, combined with the analysis of coal seam macro- and microscopic deformation and regional tectonic setting, discussed the structural evolution and its controls on deformation of coal seam in Faer mining area. The results show that the tectonic framework of Faer mining area is mainly characteristicic by 'structural belt alternate with block, rhombic combination pattern'. Although mine structure of Faer Coal Mine is relatively simple, the indications of multistage structural activities are significant. The intense tectonic compression of NWW direction in Middle Yanshanian Epoch caused formation of reverse faults and folds trending NE in most areas and development of NW directed structures beside the boundary faults. NNE tectonic compression and dextral shearing action intensifies and modifies the early structures in Late Yanshanian Epoch and NE trending normal faults are formed by NW-SE extension. Cataclastic structural coal, mortar structural coal, and wrinkle structural coal, with deformation characteristics mainly involve the development of multiple brittle joint sets, mortar textures, and ductile folds respectively, are formed by structural deformation on coal seam. Early cleats in coal seam are commonly reformed into vertical bedding joints by Middle Yanshanian Movement. The difference in the development of bedding slip joints and the reformation of early structure formed in Late Yanshanian Movement leads to the differentiation in deformation characteristics of tectonically deformed coal.

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