Neogene to Quaternary Central Arctic Ocean dinoflagellate cyst stratigraphy and polar paleoceanography

新近纪至第四纪北冰洋中部甲藻包囊地层学和极地古海洋学

• 批准号: 13002052
• 负责人: Dr. Jens Matthiessen
• 金额: --
• 依托单位: Sektion Marine Geologie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/13002052?language=en
• 关键词: Neogene; Quaternary; Central; Arctic; Ocean

IODP Leg 302 (ACEX: Arctic Coring Expedition) recovered for the first time in the scientific exploration of the high northern latitudes drill cores from the perennially ice-covered Central Arctic Ocean. A dinoflagellate cyst biostratigraphy of the Neogene to Quaternary sediments will be established and calibrated versus magnetostratigraphy to provide basic age control for the holes and to date hiatuses that are probably related to the plate tectonic and/or paleoclimate development of the Eurasia Basin and the subsidence of Lomonosov Ridge. Dinoflagellate cysts and other aquatic palynomorphs will be analysed quantitatively to unravel the timing and structure of periods and events that are of global paleoclimate significance. The variability of sea-surface conditions (temperature, salinity, duration of sea-ice cover) and the discharge of freshwater from the circum-arctic land areas will be reconstructed for certain Neogene time-slices to identify the response of the Arctic Ocean to global climate change: the last two glacial/ interglacial cycles, the marine interglacial isotope stages 1, 5, 11, the mid-Pleistocene Revolution, the mid-Pliocene warm period and the subsequent inception of major glaciations in the northern hemisphere, and the mid- Miocene thermal optimum.

IODP Leg 302（ACEX：北极取芯探险）在对常年冰雪覆盖的北冰洋中部的北高纬度钻取岩心进行科学探索时首次回收。将建立新近纪至第四纪沉积物的甲藻包囊生物地层学，并与磁性地层学进行校准，为孔提供基本年龄控制，并确定可能与欧亚盆地的板块构造和/或古气候发展以及罗蒙诺索夫海岭沉降有关的断层。将对甲藻包囊和其他水生孢粉型动物进行定量分析，以揭示具有全球古气候意义的时期和事件的时间和结构。将针对某些新近纪时间片重建海面条件（温度、盐度、海冰覆盖持续时间）和环北极陆地区域淡水排放的变化，以确定北冰洋对全球气候变化的响应：最后两个冰期/间冰期旋回，海洋间冰期同位素第1、5、11阶段，中更新世革命， 上新世中期温暖期和随后北半球主要冰川作用的开始，以及中新世中期的热最适宜期。