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: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=689592
• 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.

地球的中世纪，大约。 1.8至8亿年前，见证了早期真核生物的多样化和环境的逐渐氧化，为动物的起源奠定了基础。这个十亿年的间隔被两个超级大陆的形成所包围，这两个超级大陆的聚集和分裂可能深刻地影响了海洋化学以及沉积物中矿藏的时空分布。阐明中元古代时期的构造、生物地球化学和真核演化之间的模式和联系是一项重大的科学挑战，加拿大北部广泛且保存完好的中元古代沉积记录使这一挑战成为可能。 ******在接下来的五年中，我将领导一项跨学科的工作，记录和校准中元古代的古环境变化记录，并测试不断演变的生物圈、海洋氧合和板块构造之间的相互联系和反馈。该研究计划将以加拿大北部的实地考察为基础，重点了解和解析存档这些记录的沉积层序。因此，这项研究将需要对元古代沉积盆地进行地层学和沉积学分析，以更好地确定其年龄、构造背景和地质历史。这项实地工作还将收集适当的高质量样本，用于各种分析和询问沉积记录的方法，包括放射性测年、同位素地球化学、微古生物学和古地磁学。分析工作将由我的高技能和多元化的研究小组以及具有互补的专业研究知识的同事来完成。将优先为总部提供尖端分析方法培训的机会。所得数据将有助于记录中元古代环境的演变，并开发和测试驱动这些变化的机制模型。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。在本研究计划过程中收集的样本将被仔细编目并可供其他研究项目使用。 ******该研究计划将改善加拿大北极地区元古代盆地的地层框架，其起源将与北美元古代构造演化的新兴模型联系起来。这些盆地的数据又将与其他中元古代盆地的数据进行整合，以便更好地校准和构建中元古代地质时间尺度。这些结果将揭示这些盆地的经济潜力，并为了解早期复杂生命摇篮的全球古环境提供新的线索。