| 大别山北麓高煤级煤的变形——变质类型 |
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| 引用本文： | 曹代勇,张守仁.大别山北麓高煤级煤的变形——变质类型[J].地质科学,2003,38(4):470-477. |
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| 作者姓名： | 曹代勇 张守仁 |
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| 作者单位： | 中国矿业大学煤炭资源教育部重点实验室 北京 100083 |
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| 基金项目： | 国家自然科学基金，高等学校博士学科点专项科研项目，49872067，20010290009，， |
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| 摘 要： | 对中国东部大别造山带前陆盆地石炭纪含煤岩系的高煤级煤进行了深入研究,划分出3种变形——变质类型。构造——热变质类型煤样采自剪切应变带内,煤镜质组反射率各向异性显著,煤结构参数Lc最大,La/Lc和d002最小,TEM下存在局部石墨化现象,呈现动力变质特征。岩浆热变质类型煤样受中生代花岗岩侵入体异常高温影响,Romax和Robi较大,显微镜下呈非均质结构,La/Lc在3类煤中最大。区域变质类型煤的Romax最小,但仍远远高于稳定地区相近地质时代煤,反映了造山带旁侧构造——热活动背景下有机质的高演化程度。
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| 关 键 词： | 大别造山带 高煤级煤 变形——变质类型 煤化作用 |
| 文章编号： | 0563-5020(2003)04-0470-08 |
| 收稿时间： | 2001-12-15 |
| 修稿时间： | 2001年12月15 |
DEFORMATION-METAMORPHIC TYPES OF HIGH-RANK COAL IN NORTHERN SLOPE OF THE DABIE MOUNTAINS, CENTRAL CHINA |
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| Cao Daiyong,Zhang Shouren.DEFORMATION-METAMORPHIC TYPES OF HIGH-RANK COAL IN NORTHERN SLOPE OF THE DABIE MOUNTAINS, CENTRAL CHINA[J].Chinese Journal of Geology,2003,38(4):470-477. |
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| Authors: | Cao Daiyong Zhang Shouren |
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| Institution: | Key Laboratory of Coal Resources, Ministry of Education, China University of Mining and Technology, Beijing 100083 |
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| Abstract: | The deformation and metamorphism of the Carboniferous coals, located in the northern foreland basin of the Dabie Orogenic Belt in the central China, were studied, based on which three predominant types of coal deformation metamorphism were divided, namely, tectono thermal metamorphism, telemagmatic metamorphism and regional metamorphism. The coal samples of tectono thermal metamorphic type were from a strong shear zone, whose anisotropy of vitrinite reflectance was intensive. Among the three groups of coal samples, L c of the tectono thermal metamorphic type was the largest, both the L a/ L c and d 002 values were the smallest. Some graphite texture in coal could be observed under TEM. These features suggested that coal was undergone dynamic metamorphism in varying degrees. The coal samples of telemagmatic metamorphic type were affected by abnormally high temperature near a granite intrusive in age of Mesozoic, which had large R o max and R o bi and nonhomogeneous texture under the microscope. L a/ L c value of this type was the largest among the three metamorphism types. The R o max value of regional metamorphic coal was the smallest among the three types but far larger than that of coal within craton basin in the same geological age, which demonstrated a high evolution degree of organic matters on the tectono thermal activity background near an orogenic belt. |
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| Keywords: | The Dabie orogenic belt High rank coal Coal deformation metamorphic types Coalification |
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