| 柴达木盆地托素湖现生Eucypris mareotica壳体微量元素环境指示意义研究 |
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| 引用本文：宋高,丁涛,马宏涛.2024.柴达木盆地托素湖现生Eucypris mareotica壳体微量元素环境指示意义研究[J].地球学报,45(5):706-714. |
| DOI：10.3975/cagsb.2024.051702 |
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| 基金项目:中国地质调查局地质大调查项目“钾锂硼等紧缺盐类矿产综合调查”(编号: DD20230037) |
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| 中文摘要:通过2018年4月采集的托素湖不同区域的现生介形虫及其寄生水体, 研究Eucypris mareotica壳体微量元素与环境之间的相关关系。结果表明, 托素湖E. mareotica壳体Mg离子含量与水体Mg离子和温度均无明显的线性关系。在单一温度下, 壳体Li/Ca比值与温度的相关性不明显, 而壳体Mg/Ca比值与温度呈较好的正相关关系。褡裢河入湖口处的E. mareotica壳体Mg/Ca比值随温度升高而明显降低, 指示托素湖地区E. mareotica壳体Mg/Ca比值至少受温度和盐度两种环境因子的控制。相比Mg的分配系数KD(Mg), Li的分配系数KD(Li)与温度之间的相关性更明显, 随着温度的升高, KD(Li)逐渐下降, 我们通过二者之间的数据拟合, 建立了基于E. mareotica壳体KD(Li)的温度定量转换公式。E. mareotica壳体Sr/Ca和Ba/Ca比值平稳的变化趋势与稳定的水体盐度吻合, 指示在托素湖地区壳体Sr/Ca和Ba/Ca比值可以用于指示水体盐度变化。壳体Mn/Ca随水体深度的增加而增加, 二者具有较好的线性关系, 基于此建立了E. mareotica壳体Mn/Ca与水体深度之间的定量转换公式。温度和深度定量转换公式的建立, 可为托素湖地区古环境定量重建提供依据和参考, 但后续还需要采集更多的样品以及进行更精细、更广泛温度、盐度范围条件下的室内培养试验来对定量转换公式进行验证和完善, 以期为柴达木盆地乃至青藏高原古环境定量重建提供一种可靠的代用指标。 |
| 中文关键词:托素湖 Eucypris mareotica 微量元素 环境指示意义 |
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| The Environmental Implications of Trace Element in Shells of Living Eucypris mareotica in Tuosu Lake, Qaidam Basin |
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| Abstract:The correlation between trace elements in Eucypris mareotica shells and that in the environment was studied by collecting live ostracods and their parasitic waters from different regions of Tuosu Lake in the Qaidam Basin. The results indicated that no significant linear relationship between the Mg content in the E. mareotica shells and the water or temperature. At the single temperature, no significant relationship between Li/Ca ratios were observed in E. mareotica shells and temperature, while Mg/Ca ratios in E. mareotica shells display a positive correlation with temperature. Living E. mareotica shells at the entrance of the Dalian River into Tuosu Lake, whose Mg/Ca ratios decreased significantly with increasing temperature, indicated that the Mg/Ca ratio in E. mareotica shells is controlled by at least two environmental factors: temperature and salinity. Compared with the distribution coefficient KD(Mg), the correlation between KD(Li) and temperature was more pronounced, as the temperature increased, KD(Li) decreased gradually. A quantitative conversion formula between KD(Li) and the temperature was established based on data fitting. The steady trend of Sr/Ca and Ba/Ca in E. mareotica shells was consistent with the stable salinity of water, indicating that the Sr/Ca and Ba/Ca ratios can be used to predict salinity changes in Tuosu Lake. A strong positive linear relationship was observed between Mn/Ca ratios and water depth, and a quantitative conversion formula was established for water depth based on the Mn/Ca ratios in E. mareotica shells. The quantitative conversion formulas for water temperature and depth can provide a foundation and reference for the quantitative reconstruction of the paleoclimate in Tuosu Lake. However, quantitative conversion formulas require verification and improvement by collecting more living E. mareotica and parasitic water samples, and undertaking indoor cultivation experiments under more precise, extensive temperature and salinity range conditions to provide a reliable substitute indicator for the quantitative reconstruction of the paleoclimate in the Qaidam Basin and Qinghai-Tibetan Plateau. |
| keywords:Tuosu Lake Eucypris mareotica trace element environmental implications |
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