THE CHARACTERISTICS OF VOLCANIC EVENT DEPOSITS AND THEIR TEMPORAL-SPATIAL DISTRIBUTION OF BENXI AND TAIYUAN FORMATIONS IN NORTH CHINA PLATFORM(NCP)
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摘要: 作者对华北地台24个煤田及煤矿区进行了详细的研究,在本溪组及太原组中共发现6期12次火山事件层。这些火山事件沉积遍及全区,主要为凝灰岩、沉凝灰岩及凝灰质沉积岩,它们在时空分布上有一定规律。火山碎屑可能来自华北地台以北及以南若干不同的火山源,而岩浆可能来自下地壳。Abstract: From a study of a good number of coal fields and coal mines of the North China Platform, 12 volcanic event layers which can be grouped into 6 stages have been discovered by the authors in Benxi and Taiyuan Formations.These volcanic event deposits are wide spread in the region and consist mainly of turfs, tuffites and tuffaceous sedimentary rocks. There is some regularity in their temporal-spatial distribution.The volcanic fragments were probably from different volcanic sources to the north and south of North China Platform and the magma of volcanic matter was, maybe, from the lower crust.
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Key words:
- North China Platform /
- Benxi Formation /
- Taiyuan Formation /
- Volcanic event deposit /
- Volcanic source
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