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Plio-Pleistocene planktonic foraminifera biostratigraphy and biochronology

上更新世浮游有孔虫生物地层学和生物年代学

基本信息

批准号：
2059416
负责人：
金额：
--
依托单位：
University College London
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2018
资助国家：
英国
起止时间：
2018 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2059416
关键词：
Plio Pleistocene planktonic foraminifera biostratigraphy

项目摘要

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.

浮游有孔虫拥有最完整的化石记录之一，由于它们在海洋中的丰富性，它们为海洋沉积物的测年和对比提供了很好的手段。有效利用浮游有孔虫需要很好地了解物种的生物地层范围，并对其进化和灭绝进行可靠的年龄校准。目前的生物年代学结合了少数地方的数据，在许多情况下依赖于单一地点的年龄校准。需要从多个地点和不同地区进行研究，以测试这些校准的可靠性，并在必要时用新的地区年龄取代它们。在最近的国际海洋发现计划（IODP）印度洋-太平洋探险（Exp. 363)南大西洋（Exp. 390/393），含有丰富的和保存完好的浮游有孔虫组合。可靠的磁性地层年龄控制整个上新世-更新世沉积序列，提供了很好的机会，重新解决和重新校准许多生物事件。我们对取样材料的初步研究导致描述了一种新的化石浮游有孔虫，并允许识别一些生物事件，其时间与公布的年龄形成对比。正在进行的研究结果将提供新的高分辨率数据，改进上新世-更新世浮游有孔虫的全球生物地层学和生物年代学。