陆相断陷盆地的构造层序地层分析

海洋浮游有孔虫中的硼同位素能够反映海水酸碱度的变化,从而为重建大气二氧化碳浓度的变化提供了一种新的手段,有望提供目前极地冰心记录所无法企及的百万年甚至千万年时间尺度上的大气二氧化碳浓度的变化。最近,海洋浮游有孔虫硼同位素的研究在实验分析技术(负热电离质谱法)、实验室偏差、同位素分馏系数、海水硼同位素长期变化以及各种次要因素等方面都取得了长足的进步,尤其是全蒸发负热电离质谱法的建立使硼同位素分析的样品需求量降到纳克级以下。不过,尽管海洋浮游有孔虫中的硼同位素作为大气二氧化碳浓度的替代指标很具有潜力,但还需要进行更加深入地研究。

Boron isotopic analyses on marine planktonic foraminifera

Boron isotopic compositions in marine planktonic foraminifera can record changes in seawater pH,hence provide a new tool to reconstruct the changes of palaeo-atmospheric pCO2 on million-year time scale which is beyond the reach of the even most recently studied icecores.In the past several decades,great achievements have been made by the marine foraminiferal boron isotope researches on the following aspects:analytical techniques,offsets between laboratories,isotopic fractionation factor,long-term changes in seawater boron isotopic compositions and vital effects.However,although marine planktonic foraminiferal boron isotope has great potential to be a proxy for atmospheric pCO2,further studies on calibrations are required.