莺歌海盆地上新统双壳类贝壳的锶含量及其意义

锶（Ｓｒ）是碳酸盐沉积物及软体动物介壳中的重要微量元素之一，Ｓｒ含量和Ｓｒ／Ｃａ比值的变化明显受沉积相的控制。因此，锶作为地球化学指标具有一定的环境意义。通过对南海北部莺歌海盆地莺６井上新统双壳类贝壳中的Ｓｒ含量和Ｓｒ／Ｃａ比值的变化与环境、成岩作用关系的研究，发现莺歌海盆地上新世沉积环境为上陆坡→潮下带→潮间带，所得结论与双壳类的生态环境和地层沉积相的综合分析结果一致。

Content of Strontium in Bivalve Shells from the Pliocene Series of Yinggehai Basin and its Geochemical Significance

Strontium is one of the important trace elements in carbonate sediments and calcite shells of mollusks. The variations of Sr contents and Sr/Ca ratios are controlled by sedimentary facies. Thus, the strontium has environmental significance as a geochemical indicator. By means of the study of the relationship between the variations of Sr contents, Sr/Ca ratios in the bivalve shells and environments, diagenesis from the Pliocene series in the Ying 6 well of Yinggehai Basin on the northern shelf of the South China Sea, we divided the depositional environments of the Pliocene series of Yinggehai Basin from bottom to top into upper slope, subtidal zone and intertidal zone. The conclusion of depositional environment is consistent with those from ecological environment of bivalves and the synthetic analysis of sedimentary facies of the strata.