煤系成因说、碳酸盐岩成因说都提供了丰富的地球化学资料，但也留下不少的疑问。
The coal series origin theory and the carbonate origin theory both provide abundant geochemical data, but there are much doubt about them.
煤系成因说、碳酸盐岩成因说都提供了丰富的地球化学资料，但也留下不少的疑问。
The coal series origin theory and the carbonate origin theory both provide abundant geochemical data, but there are much doubt about them.
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