湖相介形虫壳的稳定同位素和微量元素在古气候研究中的应用

本文介绍了测定实验室养殖的介形虫Candonarawsoni和水的氧同位素分馏系数，结果表明，这个种属的介形虫壳的氧同位素组成是它所生成环境水的氧同位素组成和水温的函数。因此，介形虫壳的氧同位素组成是一个很好的水化学环境指示计。本文研究了Candonarawsoni的脱壳温度范围，发现它可以在很宽温度范围内脱壳及生长新壳。由于季节温度变化很大，所以用介形虫壳的地球化学指标研究古环境的变化时，每个样品都要采集较多的个体介形虫壳，以使其分析结果能代表年平均温度。

SABLE─ISOTOPE AND TRACE─ELEMENT COMPOSITION ON OSTRACODE SHELLS AND THEIR APPLICATION TO PALEOCLIMATIC RECONSTRUCTION

The calcite shells of ostracodes are an important source of biogenic carbohate that can be analyzed for its isotopic composition and trace element ratios to provide an account of chemistry and temperature changes in closed-basin lakes. The variations in lake chemistry and temperature can in turn provide high-resolution records of hydrologic and climatic change in the study area.Accurate interpretation of the geochendcal record from fossil ostracodes requires a solid understanding of ostracode isotope-chemistry and life-history. To explore these issues, ostracodes were cultured in the laboratory under controlled water chendstry and temperature.