The Middle Proterozoic Record of Tectonic, Biogeochemical, and Eukaryotic Evolution

中元古代构造、生物地球化学和真核进化的记录

• 批准号: RGPIN-2017-04025
• 负责人: Halverson, Galen
• 金额: $ 3.42万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=751012
• 关键词: Middle; Proterozoic; Record; Tectonic; Biogeochemical

Earth's middle age, ca. 1.8 to 0.8 billion years ago, witnessed the diversification of early eukaryotic and the gradual oxygenation of the environment that set the stage for the origin of animals. This billion-year interval was bracketed by the formation of two supercontinents whose assembly and break-up likely profoundly influenced ocean chemistry and the spatial and temporal distribution of sediment-hosted mineral deposits. Elucidating the patterns and linkages between tectonic, biogeochemical, and eukaryotic evolution during the middle Proterozoic Era is a grand scientific challenge that is made possible by the extensive and well-preserved middle Proterozoic sedimentary record in northern Canada. In the next five years, I will lead an interdisciplinary effort to document and calibrate the middle Proterozoic record of paleoenvironmental change and test the interconnections and feedbacks between the evolving biosphere, ocean oxygenation, and plate tectonics. This research program will be grounded in fieldwork in northern Canada and focused on understanding and parsing the sedimentary successions in which these records are archived. Hence, this research will entail field seasons devoted to stratigraphic and sedimentological analysis of Proterozoic sedimentary basins to better constrain their age, tectonic context, and geological history. This fieldwork will also serve to collect appropriate high quality samples for diverse analyses and approaches to interrogating the sedimentary record, including radiometric dating, isotope geochemistry, micropaleontology, and paleomagnetism. Analytical work will be performed by my highly skilled and diverse research group and by colleagues with complementary, specialized research expertise. Providing HQP with the opportunity to train in cutting edge analytical methods will be prioritized. Resulting data will serve both to document the evolution of the middle Proterozoic environment and to develop and test mechanistic models for what drove these changes. At the same time, these data will inform stratigraphic correlations and interpretations of depositional environments. Samples collected over the course of this research program will be carefully catalogued and made available for other research projects. This research program will improve the stratigraphic framework for Proterozoic basins in Arctic Canada, the origin of which will be linked with emerging models for the tectonic evolution of Proterozoic North America. Data from these basins will in turn be integrated with datasets from other middle Proterozoic basins in order to better calibrate and construct the middle Proterozoic geological time scale. These results will both inform the economic potential of these basins and shed new light on the global paleoenvironment that was the cradle of early complex life.

地球中年，加利福尼亚。 1.8至8亿年前，见证了早期真核生物的多样化以及为动物起源奠定了阶段的环境的逐渐氧合。这十亿年间的间隔是由两个超中国形成的，它们的组装和分裂可能会深远影响海洋化学以及沉积物托管矿物质沉积物的空间和时间分布。阐明中古生代中期的构造，生物地球化学和真核进化之间的模式和联系是一项巨大的科学挑战，这是加拿大北部北部的广泛且保存完好的中国水生代沉积记录使得巨大的科学挑战。在接下来的五年中，我将领导跨学科的努力，以记录和校准古环境变化的中部记录，并测试不断发展的生物圈，海洋氧合和板块构造之间的互连和反馈。该研究计划将基于加拿大北部的实地调查，并致力于理解和解析这些记录的沉积继承。因此，这项研究将需要对植物学沉积盆地进行地层和沉积学分析，以更好地限制其年龄，构造环境和地质历史。该野外工作还将用于收集适当的高质量样本，以供各种分析和方法来审问沉积记录，包括辐射测定，同位素地球化学，微岩石学和古磁性。分析工作将由我高技能和多样化的研究小组以及具有互补的专业研究专业知识的同事进行。将优先考虑HQP进行培训的机会。结果数据将既可以记录中元环境的演变，又要开发和测试和测试驱动这些变化的机械模型。同时，这些数据将为地层相关性和沉积环境的解释提供信息。在此研究计划过程中收集的样本将经过精心分类，并用于其他研究项目。 该研究计划将改善加拿大北极地区植物盆地的地层框架，其起源将与新兴模型有关，用于新兴的北美构造演化。这些盆地的数据反过来又将与来自其他中部元古代盆地的数据集集成在一起，以更好地校准和构建中部的proterorogic地质时间尺度。这些结果都将为这些盆地的经济潜力提供详尽的影响，并为全球古环境而言，这是早期复杂生活的摇篮。