Late proterozoic stratigraphy of the Yukon and its record of earth system evolution

育空地区晚元古代地层学及其地球系统演化的记录

• 批准号: 408457-2012
• 负责人: Halverson, GalenPippa
• 金额: $ 1.46万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Northern Research Supplement
• 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=596157
• 关键词: Late; proterozoic; stratigraphy; Yukon; its

This proposal links with a concurrent Discovery proposal to pursue an interdisciplinary research program on the late Proterozoic (c. 1000-540 Ma) geological record of the Yukon. These rocks are exposed in a series of mountainous inliers extending through the north-central Yukon, from the Alaska border in the west to the border with the Northwest Territories in the east. The exceptionally preserved strata in this region record the tectonic evolution of ancestral North America spanning the break-up of the supercontinent Rodinia. Formerly contiguous sedimentary sequences occur on the margins of the continental fragments that rifted apart from northern and western Canada from about 850 to 550 million years ago. Together, these rocks bear witness to multiple glacial epochs, at least two of which were global in extent, and to a tumultuous transition to a fully oxygenated environment that supported the origin and diversification of animal life. The complex evolution of the Neoproterozoic Earth system reflects interconnetions between tectonics, global climate, the biosphere, and ocean chemistry. My research group will combine rigorous fieldwork in the Yukon with state-of-the-art geochemical techniques and innovative coupled climate-biogeochemical modeling to establish and interpret the 1) the timing and nature of northwestern North America's break-up from the supercontinent Rodinia, 2) the influence of rifting and associated magmatism on climate and marine geochemistry, and 3) the tempo of important biogeochemical and biospheric changes and their connections to other global events. The research will involve a team of McGill undergraduate and undergraduate students and a network of international collaborators. The outcomes will directly assist exploration for sediment-hosted Cu and Fe in northwestern Canada and possible links to mineralized belts on formerly adjacent continents.

该提案与并发的发现提案联系起来，以遵循育空地区晚期（c。1000-540MA）的跨学科研究计划。这些岩石暴露在一系列山区象征物中，延伸到育空中北部，从西部的阿拉斯加边界到东北地区的边界。在该地区，北美祖先的构造演变横跨超大陆罗迪尼亚的破裂。以前是连续的沉积序列发生在大陆碎片的边缘，这些碎片的边缘从北部和加拿大西部的850万年前裂开。这些岩石共同见证了多个冰川时期，其中至少两个是全球的，并且是向完全充氧的环境过渡到支持动物生命的起源和多样化的全部氧化环境。新元古代地球系统的复杂演化反映了构造，全球气候，生物圈和海洋化学之间的互连。我的研究小组将将严格的现场工作与最先进的地球化学技术和创新耦合的气候生物地球化学模型结合在一起，以建立和解释1）北美西北部与超级官员罗迪尼的分裂的时机和性质，2）型号和相关的磁与杂物的影响，以及型号的杂物型和小型地球群的影响，以及33的影响。以及生物圈的变化及其与其他全球事件的联系。这项研究将涉及一支由麦吉尔本科生和本科生组成的团队以及国际合作者网络。这些结果将直接帮助探索加拿大西北部的储藏式CU和FE，并可能与以前相邻大陆的矿化带有可能的联系。