Dinoflagelates - recorder of Palaeogene oceanic Ca budget and climate variabilities (Dinolores)

1 ODP第320和321次考察（2009年3月至7月）的目的是从赤道东太平洋取回保存完好的沉积物记录。在选择钻探地点时，特别强调获得保存完好的连续岩心材料，为古第三纪的古海洋学重建提供了极好的档案，这是一个气候变化迅速和极端的时期。除了海洋表面温度（SST），盐度和生产力等环境参数外，海洋Ca收支是模拟过去碳循环和全球气候变化的重要因素。钙同位素已被用于重建海洋钙平衡在新近纪和部分中生代，古生代和前寒武纪。该项目的目的是利用第320/321次考察期间获得的沉积物记录中的钙质甲藻孢囊来重建古近纪期间海洋δ44/40 Ca和Ca收支的波动。黑胸球壳（Thoracosphaera heimii）的钙质甲藻孢囊具有保存δ44/40 Ca长期记录的潜力。在同一种上，δ 18 O和Sr/Ca比值将用于重建古近纪的SST和盐度。

The aim of lODP Expeditions 320 and 321 (March - July 2009) is to retrieve well preserved sediment records from the equatorial eastern Pacific. For selection of the drilling locations, special emphasis was laid on obtaining well preserved continuous core material that, provides an excellent archive for paleoceanographic reconstructions of the Palaeogene, a time of rapid and extreme climate variability. Besides environmental parameters like sea surface temperature (SST), salinity and productivity, the oceanic Ca budget is an important factor for modeling past carbon cycling and global climate changes. Calcium isotopes have been used for the reconstruction of the oceanic Ca budget in the Neogene and parts of the Mesozoic, Paleozoic and Precambrian. The aim of the proposed project is to use calcareous dinoflagellate cysts of the sediment record obtained during Expeditions 320/321 to reconstruct the fluctuations in the oceanic δ44/40Ca and Ca-budget during the Palaeogene. Calcareous dinoflagellate cysts of Thoracosphaera heimii have the potential to preserve a long term record of δ44/40Ca. On the same species δ18O and Sr/Ca ratios will be analysed for the reconstruction of Palaeogene SST and salinity.