水环境化学作用
Chemical reactions in water environment
以上为机器翻译结果，长、整句建议使用 人工翻译 。
结果表明，镘头组下部的硅质层是同生期生物化学作用成因的，形成于潮下低能浅水环境；
The siliceous rocks of the lower Mantou formation were resulted from the biochemical action during the sedimentary period and formed in the environment of low-tide shallow sea.
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