摘要
根据古生物及沉积岩石学特征的研究,发现桐梓期的白云岩主要产于开阔海台地相、半开阔海台地相及半局限海台地相中。并具有从东向西由开阔海台石化地相到局限海台地相白云岩含量增多的特征。由此特点,再考虑白云作用的机制,笔者认为桐梓期白云岩多为水混合白云石化作用的产物。
Based on the studying of paleobiology and sedimentary rocks,it is found that the dolomites of the Tongzi period scatter in the open-platform facies,semiopen-platform facies and restrict -platform facies.From open-platform to restrict-platform facies,the contents of dolomites increase gradually.Considering this and the mechanism of dolomitiation,the writer decides that these dolomites are formed by the dolomitization in the mixed zone of fresh and sea waters.
