古海洋中奇妙的微亮晶碳酸盐岩

微亮晶(臼齿构造)碳酸盐岩是一种奇妙的岩石类型，在中-新元古代的古海洋碳酸盐岩沉积中占重要地位。广泛分布在中国、北美、澳大利亚、北欧、西伯利亚、西北非、印度等元古界地层中。近年, 前寒武纪研究有了可喜的进展，特别是全球事件、地层及古大陆再造研究的深入，使微亮晶碳酸盐岩（Molar Tooth Carbonates）” 成了研究中-新元古代的火力交叉点[1]。随着700Ma以前的Varanger/Marinoan全球冰期的到来，微亮晶碳酸盐岩则突然消失。其发育和衰退关系到地球生命起源和海洋碳酸盐岩沉积地球化学的突变，是解决前寒武纪生物学和地球化学事件的关键。 因此，微亮晶碳酸盐岩已经成为探索早期地球海洋环境和生命起源以及元古代国际地层对比的重大地质事件。联合国教科文/国际地科联的IGCP447项目[2]对元古代臼齿构造碳酸盐岩和地球演化进行了较详细地研究，特别是在其成因和用于全球古大陆地层对比方面取得了突破性进展。

Molar-Tooth Carbonates Which is a Bizarrerie Rock Type in Paleo-Ocean

Molar-tooth Carboantes, which is a bizarrerie rock type, holds an important position in Meso-Neoproterozoic paleo-ocean carbonate deposition. These years, precambrian research has made great progress, espercially with development of further research on global events, stratigraphy and paleocontinent reconstraction, Molar-tooth Carboantes become the Meso-Neoproterozoic hot point. And it disappears with the arrival of Varanger/Marinoan before 700Ma. Because its development and disappearance have respect to origins of life on Earth, ocean carbonates deposition and geochemical mutation, Molar-tooth Carboantes is one of the keys to Precambrian biological and geochemical events. In other words, Molar-tooth Carboantes have become a critical geological event for exploring early earth ocean environment, origins of life and proterozoic international stratigraphic correlation. The IGCP 447 approved by UNESCO/ IUGS have studied indetail about proterozoic Molar-tooth Carboantes and evolution of earth, espercially made an improtant progress in its origin and global paleocontinent stratigraphic correlation.