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Mg2+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(<1000m)、中深层白云石化(1000~2000m)和深层白云石化(>2000m)。
In order to trace back the resource of Mg^2+, studying on a lot of examples of the dolostone origins, then finding that in geological environment, the Mg^2+ is mainly from diagenetic liquid, magmatite and other solid minerals, and organism. Mg^2+ replaced Ca^2+ of calcite under special hydrokinetics mechanism while dolomitization occurred. Based on the Mg^2+ 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).
出处
《北京大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2010年第6期1010-1020,共11页
Acta Scientiarum Naturalium Universitatis Pekinensis
基金
中国石化股份有限公司勘探南方分公司科技项目(G0800-06-ZS-265)资助