Effect of lateral advection on sedimentary climate archives - high-resolution records from the last Deglacial to Holocene North Atlantic drift deposits

该项目将利用沉积学数据和来自粘土矿物学、微古生物学和有机地球化学的补充信息，详细阐述ODP站点980 （Feni drift）和984 （Björn drift）的北大西洋脱冰期-全新世漂移沉积物的综合、多参数千年记录。作为中心问题的沉积物粒度将提供过去2万年中当前强度变化的详细信息，在冰筏偏差从记录中过滤之后。粘土矿物组合将确定细粒物质的潜在来源区域。球粒岩组合的组成指示了地表水文和生产力的变化以及重新分布的前第四纪物种的供应。有机碳和同位素研究将揭示碳酸盐和有机物质的组成和放射性碳年龄相对于大块沉积物的性质之间可能存在的抵消。子学科的整合将展示当前作用对古气候记录解释的侧向沉积位移的可变影响。

This project will elaborate an integrated, multi-parameter millennial-scale record of Deglacial-Holocene drift sediments in the North Atlantic at ODP Sites 980 (Feni Drift) and 984 (Björn Drift) using sedimentological data and supplementary information from clay mineralogy, micropaleontology, and organic geochemistry. Sediment grain-sizes as the central issue will provide detailed information on the current strength variability over the past 20,000 years, after ice-rafted bias is filtered from the record. The clay mineral assemblage will identify potential source areas for fine-grained material. The composition of the coccolith assemblage gives indications for changes of surface hydrology and productivity and supply of re-distributed pre-Quaternary species. Organic carbon and isotopic studies will reveal possible offset between composition and radiocarbon ages of carbonate and organic matter in the fine fraction relative to properties of the bulk sediment. The integration of the sub-disciplines will demonstrate the variable impact of lateral sediment displacement by current action on the interpretation of palaeoclimatic records.