微亮晶（臼齿）碳酸盐成因及其在元古宙地球演化中的意义
Origin of Microsparite carbonates and the significance in the evolution of the Earth in Proterozoic
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摘要: 本文应用多种技术方法，对微亮晶碳酸盐岩的成岩作用及其成因从宏观至微观进行了分析，根据岩石矿物学、地球化学和有机地球化学等研究证明，它是早期成岩过程中，在超高压的大气CO2水平急剧下降的转折期，快速石化作用形成的具等粒结构μm级的微亮晶方解石集合体。MT碳酸盐岩微亮晶成岩作用有两种类型：一是主要发生在海底沉积软泥中，在其成基质软混中经差异压实作用形成褶皱肠状及复杂形的MT构造；二是直接在海水中或重力流搬运过程中形成的微亮晶球粒（核）。简言之，MT碳酸盐岩石是在地球早期浅海环境下，由于微生物自养作用形成的地球化学成因产物。微亮晶碳酸盐齿是约束古大气圈和古海洋环境变化的最灵敏标志。通过详测MT丰度值和编制地球古大气圈CO2水平演化模或等．在前寒武纪发现有太古宙末期、早元古宙末期、中元古宙中期和新元古宙早-中期四个MT碳酸盐岩发育高峰值期，证明全球古大气圈CO2水平发生过四次不连续性、跳跃式下降周期，直到晚新元古宙末，全球雪球事件的发生．导致了MT碳酸盐岩的消失，其后，才进入显生宙的CO2低水平状态。MT醚酸盐岩具有重要的油气资源远景，应予以重视。
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关键词:
- 微亮晶碳酸盐岩 /
- 成岩作用 /
- 成因机制 /
- 元古宙 /
- 地球演化大气圈CO2
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Key words:
- Microsparite carbonates /
- Diagenesis /
- Origin /
- Proterozoic /
- Earth evolution
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