白云石化机理与白云岩成因问题研究

通过统计大量白云岩成因的例子, 追溯其离子来源, 得出: 地质环境中白云石化所需Mg²⁺主要来源于成岩流体、岩浆岩及其他固体矿物和生物, 这些Mg经特定的流体动力学机制交代方解石中的Ca²⁺使之转化为 白云石。根据Mg²⁺来源和流体动力学机制, 目前较成熟的白云石化成因模式主要有蒸发模式( 萨布哈模式)、渗透回流模式、混合水模式、海水模式、埋藏模式以及热液成因模式。根据不同的埋藏条件, 可将白云石化分为3 类: 浅层白云石化(<1000 m)、中深层白云石化( 1000 ～2000 m) 和深层白云石化(> 2000 m)。

Study on the Dolomitization and Dolostone Genesis

In order to trace back the resource of Mg2 +,studying on a lot of examples of the dolostone origins,then finding that in geological environment,the Mg2 + is mainly from diagenetic liquid,magmatite and other solid minerals,and organism.Mg2 + replaced Ca2 + of calcite under special hydrokinetics mechanism while dolomitization occurred.Based on the Mg2 + resource and hydrokinetic mechanism,the dolomitization models,accepted by most people,can be divided into evaporation model (Sabkha model),seepage-reflux mode...