Collaborative Research: Quaternary Paleoenvironmental Evolution of the Larsen Basin, Offshore Seymour Island, Eastern Antarctic Peninsula

合作研究：南极半岛东部西摩岛近海拉森盆地第四纪古环境演化

• 批准号: 9419316
• 负责人: Rosemary Askin
• 金额: $ 0.98万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-04-15 至 1998-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9419316&HistoricalAwards=false
• 关键词: Collaborative; Research; Quaternary; Paleoenvironmental; Evolution

Abstract This award supports a collaborative study of Quaternary glacial marine deposits of the Larsen Basin. These sedimentary deposits are uniquely suited for study of the Modern environmental setting and recent paleoclimatic evolution of the northeastern Antarctic Peninsula continental shelf, an area thought to exhibit pronounced sensitivity to climatic changes. Microfossils from these deposits and their stable isotope compositions provide information on varying oceanographic conditions, ice mass extent, and sediment dispersal. Questions to be answered include: 1) What are the faunal and isotopic responses to glaciation, both proximal and distal to the variety of small and medium ice masses in the area? 2) What is the relationship between physical evidence of ice position, as expressed in sediments and seismic data, and the faunal and isotopic signatures thereof? 3) To what extent is an environmental model of the highly variable interglacial Modern shelf applicable to describing and understanding late Quaternary environments representative of different climatic regimes? Preliminary results of a pilot study using surface and cored sediments indicate that foraminiferal assemblage composition and stable isotope ratios record highly variable Modern and late Quaternary environmental conditions. However, data are needed from a larger number of cores to reconstruct the Antarctic Peninsula late Quaternary environmental history. Methods to be employed in this research are foraminiferal and palynological analyses, foraminiferal carbon and oxygen isotope ratios, and carbon-14 measurements. The primary research objectives of the proposed one-year project are as follows: 1) Provide the first study for the Antarctic Margin Project for drilling in shallow water depths offshore of Seymour Island. The proposed work would serve to provide a sound environmental framework of the Quaternary deposits from which to interpret the Cenozoic record; 2) Establish the first Qua ternary stable isotope chronostratigraphy for Antarctic continental shelf sediments; 3) Document and interpret Quaternary climatic fluctuations, including proposed Holocene warming episodes, as they are preserved in the sediments, biota, and stable isotopic records, and reflect variations in local and regional ice buildup, physical and chemical oceanography, and sediment source areas. This research represents an important contribution to international global change studies.

摘要该奖项支持了Larsen盆地的第四纪冰川海洋沉积物的合作研究。 这些沉积沉积物非常适合研究现代环境环境和最近南极半岛大陆架的古气候进化，该地区被认为对气候变化具有明显的敏感性。这些沉积物及其稳定的同位素组成的微化石提供有关不同海洋学条件，冰质量范围和沉积物扩散的信息。要回答的问题包括：1）对该地区各种小型冰块的近端和远端的冰河和同位素反应是什么？ 2）在沉积物和地震数据中表达的物理迹象的物理证据与动物和同位素特征之间的关系是什么？ 3）高度可变的冰间现代货架的环境模型适用于描述和理解代表不同气候制度的晚期环境的晚期环境？使用表面和芯沉积物的试点研究的初步结果表明，有孔虫组合物组成和稳定的同位素比记录了高度可变的现代和晚期环境条件。 但是，需要大量核心来重建南极半岛晚期环境史。在这项研究中要采用的方法是有孔虫分析，有孔虫碳和氧同位素比以及碳-14测量值。 拟议的为期一年项目的主要研究目标如下：1）为在西摩岛近海浅水深度钻探的第一个研究提供了第一个研究。 拟议的工作将有助于提供Quaternary矿床的合理环境框架，以解释新生代记录； 2）建立第一个用于南极大陆架子沉积物的第一个Qua三元稳定同位素年度地层学； 3）记录和解释第四纪气候波动，包括​​拟议的全新世变暖发作，因为它们保存在沉积物，生物群和稳定的同位素记录中，并反映了局部和区域冰的堆积，物理和化学海洋学，物理和化学海洋学以及沉积物源区域的变化。 这项研究代表了对国际全球变化研究的重要贡献。