琼东南盆地三亚组碳酸盐沉积Ce异常及对环境的指示

Ce anomaly as geochemical tracers for redox condition in carbonates of Sanya Formation, Qiongdongnan Basin

田艳丽

Tian Yanli

中国地质大学, 湖北武汉 430074

China University of Geosciences, Wuhan 430074

通过分析研究琼东南盆地北部边缘三亚组碳酸盐岩稀土元素地球化学特征,结果表明:稀土元素含量低于1μg/g,呈明显的Ce负异常特征;沉积物沉积于氧化环境;垂向上Ce异常的波动曲线与海平面升降的变化曲线相一致。

Rare earth elements were measured in sedimentary cores collected in carbonates of Sanya Formation. The content of rare earth elements in marine sediment is under 1 μg/g, while it shows sharp Ce anomaly, indicating that carbonate sediments in Qiongdongnan basin were deposited in oxic environments. Vertically, the curve of Ce change is consistent with eustatic sea level change, indicating that Ce change is correlated with eustatic sea level change.

中海油湛江分公司资助项目"南海西部深水区碳酸盐岩-生物礁沉积环境与分布"(编号:086140)

https://doi.org/10.3969/j.issn.1008-2336.2010.01.021