Acta Scientiarum Naturalium Universitatis Pekinensis

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Study on the Dolomitization and Dolostone Genesis

HE Yunlan1,2, LIU Bo2, QIN Shan1   

  1. 1. School of Earth and Space Sciences, Peking University, Beijing 100871; 2.Institute of Oil and Gas, Peking University, Beijing 100871;
  • Received:2009-11-03 Online:2010-11-20 Published:2010-11-20



  1. 1. 北京大学地球与空间科学学院,北京 100871; 2.北京大学石油与天然气研究中心,北京 100871;

Abstract: 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 Mg is mainly from diagenetic liquid, magmatite and other solid minerals, and Mg2+ 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 model, mixing-water model, marine dolomitization model, deep burial model and hydrothermal model. Based on the different buried conditions, dolomitization can be grouped into three kinds: shallow dolomitization ( < 1000 m) , mid-deep dolomitization ( 1000-2000 m) and deep dolomitization ( > 2000 m).

Key words: dolostone, dolomitization, genesis model, hydrokinetics

摘要: 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)。

关键词: 白云岩, 白云石化, 成因模式, 流体动力学

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