Plio-Pleistocene planktonic foraminifera biostratigraphy and biochronology

浮游有孔虫是最完整的化石记录之一，由于它们在海洋中极其丰富，它们为海洋沉积物的年代测定和对比提供了很好的手段。有效利用浮游有孔虫需要对物种生物地层范围有很好的了解，并对它们的演化和灭绝进行可靠的年龄校准。目前的生物年代学结合了来自少数地区的数据，在许多情况下依赖于单一地点的年龄校准。需要来自多个地点和不同地区的研究来测试这些校准的可靠性，并在必要时用新的区域年龄取代它们。在最近的国际海洋发现计划(IODP)到印度-太平洋(Exp.363)和南大西洋(Ext.390/393)，含有丰富且保存完好的浮游有孔虫组合。在上新世-更新世沉积序列中可靠的磁性地层年龄控制，为重新处理和重新校准许多生物事件提供了很好的机会。我们对采样材料的初步研究导致了浮游有孔虫化石的一个新物种的描述，并使我们能够识别出一些生物事件，其时间与公布的时代相反。正在进行的研究结果将提供新的高分辨率数据，改善全球生物地层学和浮游有孔虫的生物年代学。

Planktonic foraminifera have one of the most complete fossil records, and thanks to their overwhelming abundance in the oceans, they provide great means for dating and correlation of marine sediments. Effective use of planktonic foraminifera requires a good knowledge of species biostratigraphic ranges with reliable age calibrations for their evolution and extinction. The current biochronology combines data from a small number of localities and in many cases relies on age-calibrations from a single site. Studies from multiple sites and various regions are required to test reliability of these calibrations and to replace them with new regional ages if necessary. The deep-sea drill cores recovered during recent International Ocean Discovery Program (IODP) expeditions to the Indo-Pacific (Exp. 363) and South Atlantic (Exp. 390/393), contain abundant and well-preserved assemblages of planktonic foraminifera. Reliable magneto-stratigraphic age control throughout Plio-Pleistocene sedimentary sequences, provides great opportunity to re-address and re-calibrate many of the bioevents. Our initial study of the sampled material led to description of a new species of fossil planktonic foraminifera and allowed the identification of a number of bioevents with timing contrasting from published ages. Results of ongoing research will provide new high-resolution data, improving global biostratigraphy and biochronology of Plio-Pleistocene planktonic foraminifera.