从浙赣皖相邻区→德兴地区→铜陵地区，岩体的里特曼指数逐渐增加，A/CNK逐渐减小，K/（K+Na）逐渐减小。
Rittman index gradually increases , A / CNK gradually decreases and K / K + Na gradually decreases from the Zhejiang-Jiangxi-Anhui border area to the Dexing area , and then to the Tongling area .
里特曼指数