Biostratigraphy and surface-water reconstruction for the Oligocene of the North Atlantic based on organic-walled dinoflagellate cysts

基于有机壁甲藻包囊的北大西洋渐新世生物地层学和地表水重建

• 批准号: 242917912
• 负责人: Professor Dr. Oliver Friedrich
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/242917912?language=en
• 关键词: Biostratigraphy; surface; water; reconstruction; Oligocene

The Oligocene epoch (33.9-23.03 Ma) represents a critical interval of the Cenozoic because it allows to study the processes underlying the transition from a world free of large-scale continental ice shields and rapid eustatic sea-level change to one dominated by these factors. To contribute to a better understanding of Oligocene climate dynamics in the higher-latitude North Atlantic, we propose a two-step approach based on the complete, magnetostratigraphically dated Oligocene sequence recovered during IODP Expedition 342 off Newfoundland using dinoflagellate cysts as biostratigraphic and paleoenvironmental indicators. While the main focus of the first project phase was on establishing the first chronostratigraphically calibrated dinocyst biostratigraphy for the Oligocene of the higher-latitude North Atlantic, the second project phase will be dedicated to elucidating surface-water conditions during key intervals of the Oligocene using dinocysts. Much of the sample processing and microscope analyses necessary for the second project phase have already been carried out. The key intervals to be studied in high (c. 15 kyr) resolution, are (i) the Eocene/Oligocene transition (34.9-33.2 Ma; comprising the paleoceanographic change connected to the onset of large-scale Antarctic glaciation), (ii) the "mid"-Oligocene (28.3-25.9 Ma; Oi-2b glacial maximum with surface-water cooling extending into the mid-latitudes), and (iii) the Oligocene/Miocene transition (23.3-22.6 Ma; Mi-1 glacial maximum). The results will be integrated with other SST data that are currently being generated within the Expedition 342 consortium. Besides providing unprecedented insights into Oligocene surface-water dynamics in the higher-latitude North Atlantic, this study will also contribute towards a better understanding of the Oligocene climate system as a whole.

渐新世（33.9-23.03 Ma）是新生代的一个关键时期，因为它可以研究从一个没有大规模大陆冰盖和海平面快速上升变化的世界向一个由这些因素主导的世界转变的过程。为了更好地理解北大西洋高纬度地区渐新世的气候动力学，我们提出了一种基于完整的、磁地层定年的渐新世序列的两步方法，该方法是在纽芬兰附近的IODP远征342期间使用鞭毛藻囊作为生物地层和古环境指标。项目第一阶段的主要重点是为北大西洋高纬度渐新世建立第一个年代地层校准的恐龙囊生物地层学，而项目第二阶段将致力于利用恐龙囊来阐明渐新世关键时期的地表水条件。第二个项目阶段所需的大部分样品处理和显微镜分析工作已经进行。高分辨率（c. 15 kyr）研究的关键区间为(i)始新世/渐新世过渡（34.9-33.2 Ma，包括与大规模南极冰期开始有关的古海洋变化），（ii）“中”-渐新世（28.3-25.9 Ma， io -2b冰期最大值，地表水冷却延伸至中纬度），以及（iii）渐新世/中新世过渡（23.3-22.6 Ma， Mi-1冰期最大值）。该结果将与目前由Expedition 342财团生成的其他海温数据集成。除了对高纬度北大西洋渐新世地表水动力学提供前所未有的见解外，这项研究还将有助于更好地理解整个渐新世气候系统。

项目成果

Sea-level and surface-water change in the western North Atlantic across the Oligocene–Miocene Transition: A palynological perspective from IODP Site U1406 (Newfoundland margin)

• DOI: 10.1016/j.marmicro.2017.11.003
• 发表时间: 2018-03
• 期刊: Marine Micropaleontology
• 影响因子: 1.9
• 作者: Lisa M. Egger;A. Bahr;O. Friedrich;P. Wilson;R. Norris;T. Peer;P. Lippert;D. Liebrand;J. Pross

Comment on ‘Wetzeliella and Its Allies - the ‘Hole’ Story: A Taxonomic Revision of the Paleogene Dinoflagellate Subfamily Wetzelielloideae' by Williams et al. (2015)

Williams 等人对“Wetzeliella 及其盟友 - “Hole” 故事：古近纪甲藻亚科 Wetzelielloideae 的分类学修订》的评论 (2015)

• DOI: 10.1080/01916122.2016.1235056
• 发表时间: 2017
• 期刊: Palynology
• 影响因子: 1.5
• 作者: Brinkhuis;Eldrett;Frieling;Grothe;Houben;Śliwińska;Sluijs
• 通讯作者: Sluijs