湘中地區(qū)煤系變形及煤變質(zhì)作用特征分析
[Abstract]:Under the influence of strong magmatic thermal activity, the coal of the Shuihui formation and Longtan formation in central Hunan is superimposed on the background of regional metamorphism, at the same time, the multi-stage and multi-level tectonic deformation complicates the process of coalification. By means of coal quality analysis, X-ray diffraction, scanning electron microscope and other experimental methods, the coal chemical composition and structural characteristics, microstructure, deformation and metamorphism of coal measures in the central Hunan area were analyzed in terms of the chemical composition and structure of the coal measures of the Shuihui formation and the Longtan formation, and the characteristics of coal deformations and coal metamorphism were discussed. The results show that the coal metamorphic belt is generally distributed in the north to east direction, and the reverse ring zone appears at the margin of the larger coal-bearing syncline, which shows the phenomenon of anti-Hilt 's law. The stress concentration and magmatic thermal action caused by laminar slip fault increase the metamorphic degree of coal in local area and change the physical properties and structure of coal to form tectonic coal. Due to the tectonic-thermal coupling of the Tianlongshan rock body in the Xinhua Hanpo Depression syncline, the mosaic structure is commonly found in the coal, and the macromolecular structure of the coal tends to be ordered, the spacing of the surface network d002 decreases, and the piling degree of the aromatic lamellae increases. Typical structural characteristics of dynamic metamorphism, high coal rank coal gradually transition to cryptic graphite, composed of fine scales, the particle size is 50 ~ 250 nm.
【作者單位】: 西安科技大學(xué)地質(zhì)與環(huán)境學(xué)院;
【基金】:國家自然科學(xué)基金(41502160) 中國博士后科學(xué)基金(2016M592907XB) 西安科技大學(xué)培育基金(2014012)
【分類號(hào)】:P618.11
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