The zone of coal metamorphism is evident and related to the distribution of diabase which intrusion after main coal formation.
煤变质带的分布与后期侵入的辉绿岩的分布关系密切。
The zone of coal metamorphism is evident and related to the distribution of diabase which intrusion after main coal formation.
煤变质带的分布与后期侵入的辉绿岩的分布关系密切。
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