Quantifying the isotopic composition of oxygen and carbon through time in the core MD032607, located off South Australia

The calcareous tests of Globigerina bulloides are analysed to quantify the isotopic composition of oxygen and carbon through time at core site MD032607 (137.4065 E, 36.9606 S).The lightest 18O value of 0.43ppt was recorded during the Holocene (20cm depth) while the heaviest 18O value of -2.71ppt was registered at the LGM (300cm depth). The 13C record ranges from a minimum at approximately 25cm (~2155yrs BP) of 0.00ppt, to a maximum value at 120cm (~10,330yrs BP) of 1.26ppt.

本研究对岩芯站位MD032607（东经137.4065°，南纬36.9606°）中的布氏球房虫（Globigerina bulloides）钙质壳体开展分析，以定量重建该岩芯时间序列上的氧、碳同位素组成。全新世（岩芯深度20cm处）记录到最轻的氧同位素（18O）值为0.43ppt；而末次盛冰期（Last Glacial Maximum，LGM）（岩芯深度300cm处）记录到最重的氧同位素值为-2.71ppt。碳同位素（13C）序列的取值范围为：约25cm深度（对应距今约2155年）处的最小值0.00ppt，至120cm深度（对应距今约10330年）处的最大值1.26ppt。