中扬子台地北缘上震旦统碳酸盐岩中锶的分布特征及环境意义

中扬子台地北缘上震旦统碳酸盐岩沉积发育，可分为浅水台地和深水台盆两个相区和七种不同的相带。地球化学分析表明，该区碳酸盐岩中 Ｓｒ 和 Ｓｒ／ Ｃａ ×１０００ 的比值与沉积环境密切相关，由浅滩相向深水斜坡－ 盆地相明显增加。究其原因，一方面因不同沉积环境中碳酸盐矿物组分不同，影响了锶的分布；另一方面与沉积环境所决定的成岩环境有关。因此，利用微量元素锶的含量和 Ｓｒ／ Ｃａ ×１０００ 比值可以判别沉积相。

Distribution of Strontium in Upper Sinian Corbonate Rocks along the Northern Margin of Middle Yangtze Platform and Its Environmental Implications

The sedimentation of Upper Sinian carbonate rocks along the northern margin of the middle Yangtze platform occurred in two facies areas, namely shallow-water platform and deep_water platformal basin ,which include seven facies zones. There exists close relationship of Sr content and Sr/Ca×1000 ratio to the sedimentary environment, i.e., the values increase obivously from the shallow-sheal facies to the deep-water platformal basin facies. This is attributed to the infuence of the difference in carbonate mineralogy in different sedimentary environments on the Sr distribution and also to the diagenetic environment which depends upon the sedimentary environment. The content of the trace element Sr and the Sr/Ca×1000 ratio can therefore be used to judge sedimentary facies.