Chemical composition of carbonate hardground cements

Trace metal and isotopic ratios, including some rare earth elements, Mg/Ca, manganese and strontium concentrations, δ¹⁸O, δ¹³C, and ⁸⁷Sr/⁸⁶Sr, were analyzed in the carbonate...对碳酸盐中的痕量金属（trace metal）与同位素比值开展了分析检测，上述指标涵盖部分稀土元素（rare earth elements）、Mg/Ca比值、锰与锶浓度、δ¹⁸O、δ¹³C以及⁸⁷Sr/⁸⁶Sr。