| 辽宁省火山间歇期沉积煤系特点与找煤方向 |
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| 引用本文： | 程绍宝.辽宁省火山间歇期沉积煤系特点与找煤方向[J].沉积学报,1987,5(1):125-131. |
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| 作者姓名： | 程绍宝 |
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| 作者单位： | 东北煤田地质局沈阳测试中心 |
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| 摘 要： | 辽宁省有火山岩7000km2,岩垣3条,大型锥火山50个,火山丘80余个,边缘带上都有间歇期沉积煤系赋存,成煤空间局限火山边缘带,时间局限间歇期。煤系具火山-沉积成岩、多变、多层次、依赖火山特点,属新的火山成煤类型。愈往西北岩体愈大,煤系呈愈发育的趋势。煤层发育在火山岩系顶、底部,可采煤层厚1-37.49m。煤种齐全,埋藏的数量和广度均大,具有重要的经济价值。找煤方向为各岩体边缘并围绕中心旋转一周。
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| 关 键 词： | 火山岩 火山间歇期沉积煤系环带状分布 辽宁 |
| 收稿时间： | 1984-04-16 |
FEATURES OF THE COAL SERIES DEPOSITED IN ERUPTING INTERVALS AND THEIR PROSPECTING PROPOSALS |
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| Institution: | Central Laboratory of Coal-Geological Bureau of North-Eastern China and Inner Mongolia, Shenyang |
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| Abstract: | Liaoning Province is located in the circum-Pacific volcanic belt where diastro-phic and volcanic activities occured repeatedly during Mesozoic and Tertiary, forming several hundreds of volcanic cones and mounds which occupy an area about 7,000km2. The total thickness of the volcanic rocks is 3,000 metres. They are classified into the lower Yanshan volcanic rock, upper Yanshan volcanic rock and Himalayan basalt according to the interrelation between their cyclothems of magmatic differentiation and the sediments of erupting intervals. There are usually sedimentary coal series of intervals interbedded in the volcanic rocks developed ia different geological times. The typical occurrence can be seen in some coal fields in Shuangtagou of Nanpiao, Shahezi of Changtu, Wenduhua of Tianshan and Fushun. All of these coalfields, surrounding rocks of central eruption, developed in the marginal belts of volcanos. It shows that the coal accumulation is controlled by the volcanic-structural mechanism. Thus, in origin, these coal series are sharply different from those usually seen in shallow-sea, offshore or inland environments. The coal accumulation in erupting intervals is affected by volcanic mechanism and sedimentation. It formed rapidly and was of the characters of volcanic and sedimentary rocks. Since such coals were generated merely during erupting intervals and their development space was restricted in the marginal belts of central eruption, the coal prospecting should be concentrated on the regions where volcanics developed well, i.e. on Yanshan Depression and Xinganling Foldbelt, which include the upper volcanic rock in the marginal belts of volcanos (Rock Units, No. 16-50, and 35 volcanic cones) about 16,000km2, the lower volcanic rock with an area about 2,000km2 and the Tertiary basaltic platform about 8,000km2. It is necessary to research into the distribution, reserve and buried depth of the coals formed in erupting intervals, especially in Liaoning Province where more coal resources are needed keenly. Effectively mining and utilizing of such coal resources are considered of important economic significance. |
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