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地质科学  1994, Vol. Issue (3): 276-290    DOI:
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实验变形煤的光性组构分析
周建勋1, 邵震杰2, 王桂梁2
1. 西北大学地质系 西安 710069;
2. 中国矿业大学地质系 徐州 221008
ANALYSIS OF OPTICAL FABRICS IN EXPERIMENTALLY DEFORMED COALS
Zhou Jianxun1, Shao Zhenjie2, Wang Guiliang2
1. Department, of Geology. Northwest University, Xi’an 710069;
2. Department of Geology, China University of Mining and Technology, Xuzhou 221008
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摘要 三种Rmaxo分别为0.67%,3.41%和4.90%的煤样,在t=350-700℃、Pc=400-600MPa、ε=10%-30%、ε=3.63×10-4-2.59×10-5s-1条件下的变形实验表明:(1)煤光性组构的成因是芳环层片在构造应力作用下重新定向所致,重新定向的主要机制是煤化过程中芳环层片的择优成核生长,同时存在物理转动定向机制的作用;(2)芳环层片的重新定向主要发生在煤级相对较低阶段,VRI的Z轴主要反映这一阶段的构造应力方向;(3)YRI的形态特征并非仅与有限应变有关,它不能直接作为有限应变分析的标志。
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周建勋
邵震杰
王桂梁
关键词煤光性组构   镜质体反射率光性组构   高温高压实验变形     
Abstract: The deformation experiments of three kinds of coal samples whose Rmaxo is D.67%. 3.41% and 4.90% respectively were done with the Griggs’type high temperature and confining pressure rock experimental deformation aparatus of phyropyllite medium under conditions of t=350-700℃, Pc=400-600MPa,ε=10%-30%,ε=3.63×10-6-2.59 ×10-5s-1. The experimental results show that:(1)The origin of vitrinite reflectance optical fabrics is caused by the reorientation of graphite-like aromatic lamellae under tectonic stress. The major mechanism for the reorientation of aromatic lamellae is preferred neucleation and growth in the favorable direction with the increase of aromaticity during coalification. and the mechanism of physical rotation may also exist, but the possibility of mechanism of intragranular plastic deformation of molecular is very little.(2) The reorientation of aromatic lamellae takes place dominantly in the stage of relatively low coal rank. The Z axis of VRI mainly reflects the direction of tectonic compressive stress in this stage.(3) Feartures of VRI’s shape not only are related with the condition of finite strain, but also depend on the variation of aromaticity in vitrinite to a great extent.VRI can not reflect the features of finite strain ellipsoid and the magnitude of strain in the stage of higher coal rank. Therefore VRI can not be directly used as markers for strain analyses, only under some specific conditions may it be used to approximately estimate some features of strain ellipsoid in the stage of relatively low coal rank.
Key wordsCoal optical fabrics   Vitrinite reflectance optical fabrics   High temperature and confining pressure experimental deformation   
收稿日期: 1992-10-23;
基金资助:国家自然科学基金
引用本文:   
周建勋,邵震杰,王桂梁. 1994, 实验变形煤的光性组构分析. 地质科学, (3): 276-290.
Zhou Jianxun,Shao Zhenjie,Wang Guiliang. ANALYSIS OF OPTICAL FABRICS IN EXPERIMENTALLY DEFORMED COALS[J]. Chinese Journal of Geology, 1994, (3): 276-290.
 
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