Sedimentary Architecture of Modern and Ancient Glaciated Basins

现代和古代冰川盆地的沉积结构

• 批准号: RGPIN-2016-05442
• 负责人: Eyles, Carolyn
• 金额: $ 1.75万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=615695
• 关键词: Sedimentary; Architecture; Modern; Ancient; Glaciated

The proposed research will document the sedimentary architecture of landforms and sediments in modern and ancient glaciated basins in order to enhance our understanding of past environmental and climatic change. Glaciated basins contain an important record of paleoenvironmental change but this record is often difficult to decipher due to uncertainties in interpreting the origin of glacial deposits. Understanding the spatial characteristics (architecture) of glacial sediments can help identify their mode of origin and is also important for hydrogeological investigations to determine the source, quality and sustainability of groundwater; most of the groundwater used by Canadian communities is hosted in aquifers within glacial deposits and we have limited understanding of the subsurface geometry or extent of these aquifers. This research will focus on using new approaches to the documentation of glacial landforms and sediments forming in modern environments in Iceland and those preserved in Quaternary successions in Ontario. Modern glacial and proglacial landforms and sediment stratigraphies are well exposed in front of several retreating glacier margins along the southern coast of Iceland. Fieldwork will involve detailed measurement and documentation of landforms and outcrops using GPS and standard sedimentological logging techniques (recording grain size, sedimentary structures, unit contacts, thicknesses and geometries). These field data will be integrated with satellite data and will be used to identify and analyze the spatial relationships and distribution of modern glacial landforms and sediments. A second element of the proposed research is to apply what is learned from modern glacier margins in Iceland to the analysis of late Quaternary deposits in southern Ontario where complex stratigraphies of Late Quaternary glacial, lacustrine and fluvial deposits have accumulated in glacial and proglacial settings. Exposed sedimentary successions and drill core data from several locations in southern Ontario (including Georgetown, South Simcoe, and the northern shores of Lake Erie and Ontario) will be compared with the modern sedimentological and architectural data collected from Iceland. This will allow more accurate reconstructions of Late Quaternary paleoenvironmental conditions in Ontario, and will contribute significantly to the debate regarding the role that large subglacial meltwater floods played in the creation of Quaternary landforms and sediment stratigraphies.

拟议的研究将记录现代和古代冰川盆地的地貌和沉积物的沉积结构，以提高我们对过去环境和气候变化的理解。冰川盆地包含了古环境变化的重要记录，但由于冰川沉积物起源的不确定性，这种记录往往难以破译。了解冰川沉积物的空间特征（结构）有助于确定其起源模式，对水文地质调查也很重要，以确定地下水的来源、质量和可持续性;加拿大社区使用的大多数地下水都存在于冰川沉积物内的含水层中，我们对这些含水层的地下几何形状或范围的了解有限。 这项研究将侧重于使用新的方法来记录冰岛现代环境中形成的冰川地貌和沉积物，以及安大略第四纪演替中保存的冰川地貌和沉积物。现代冰川和冰前地貌和沉积物地层是很好地暴露在前面的几个退缩冰川边缘沿着冰岛南部海岸。实地工作将涉及利用全球定位系统和标准沉积学测井技术（记录粒度、沉积结构、单元接触、厚度和几何形状）对地貌和露头进行详细测量和记录。这些实地数据将与卫星数据相结合，用于确定和分析现代冰川地貌和沉积物的空间关系和分布。 拟议研究的第二个要素是将从冰岛现代冰川边缘学到的知识应用于安大略南部晚第四纪沉积物的分析，在那里晚第四纪冰川、湖泊和河流沉积物的复杂地层在冰川和冰前环境中积累。将从安大略南部（包括乔治敦、南锡姆科以及伊利和安大略北方）几个地点获得的暴露沉积序列和钻孔岩芯数据与从冰岛收集的现代沉积学和建筑学数据进行比较。这将使更准确的重建晚第四纪古环境条件在安大略，并将大大有助于辩论的作用，大冰下融水洪水在创建第四纪地貌和沉积物地层。