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牙形石色变度──ＣＡＩ值是一项有效的古地温指标，它不但可以帮助确定低级－极低级变质碳酸盐岩的最高变质温度，而且可以判别变质类型。本文在介绍牙形石ＣＡＩ值研究现状及低级－极低级变质作用研究现状的基础上，对运用ＣＡＩ值进行低级－极低级碳酸盐岩的研究进行了综述及探讨。
The conodont color - CAI value is an effective paleogeothermal index that not only helps to determine the maximum metamorphic temperature of low- and ultra-low-grade metamorphic carbonate rocks, but also determines metamorphic types. Based on the current research status of CAI value of conodont and research status of low-grade and ultra-grade metamorphism, this paper reviewed and discussed the research of CAI value for low-grade and low-grade carbonate rocks.