Insights into the Burial, Tectonic, and Hydrologic History of the Cenozoic Succession in McMurdo Sound, Antarctica through Analysis of Diagenetic Phases

通过成岩阶段分析深入了解南极洲麦克默多海峡新生代演替的埋藏、构造和水文历史

• 批准号: 1341390
• 负责人: Tracy Frank
• 金额: $ 19.65万
• 依托单位: University of Nebraska-Lincoln
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-01-01 至 2017-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1341390&HistoricalAwards=false
• 关键词: Insights; into; Burial; Tectonic; Hydrologic

Intellectual Merit: This project will use sediment cores from the Victoria Land Basin (VLB), Antarctica, to study secondary (diagenetic) carbonate minerals, as indicators of the basin?s fluid-flow history, within the well-constrained tectonic, depositional, and climatic context provided by sediment cores. This study will provide insights into subsurface processes in Victoria Land Basin, Antarctica and their relationships with the region?s climatic, cryospheric, and tectonic history. The work will utilize cores previously recovered by US-sponsored stratigraphic drilling projects (CIROS, CRP, and ANDRILL projects). This work is motivated by the unexpected discovery of dense brine in the subsurface of Southern McMurdo Sound during drilling by the ANDRILL Southern McMurdo Sound project. The presence of the brine is intriguing because it contradicts previous models for the origin of subsurface fluids that called upon large contributions from glacial melt water. Project objectives involve documenting the distribution of the brine (and potentially other fluids) via characterization of diagenetic precipitates. The approach will involve integration of petrographic and geochemical data (including conventional carbon, oxygen, and ?clumped? isotopes) to fully characterize diagenetic phases and allow development of a robust paragenetic history. This work will provide novel insights into the Cenozoic evolution of the VLB and, more broadly, the role of glacial processes in generating subsurface fluids. Broader impacts: Results from this project will help understand the origins of brines, groundwater and hydrocarbon reservoirs in analogous modern and ancient deposits elsewhere, which is of broad interest. This project will support the training of one graduate and one undergraduate student at the University of Nebraska-Lincoln (UNL) providing learning opportunities in sedimentary geology and diagenesis, fields with wide applicability. This proposal emphasizes rapid dissemination of results to the scientific community via conference presentations and contributions to peer-reviewed publications. The results will be integrated into education activities designed to develop skills in petrography and diagenesis, which are highly sought after in the energy sector. The project will generate a well-constrained dataset that allows direct linkage of diagenetic phases to environmental and tectonic change across a large sedimentary basin which will provide the basis for a comprehensive case study in an upper-level course (Sedimentary Petrography and Diagenesis) at UNL. In addition, online exercises will be developed and submitted to an open-access site (SEPM Stratigraphy Web) dedicated to sedimentary geology.

智力价值：该项目将使用南极洲维多利亚陆地盆地的沉积岩芯来研究次生(成岩)碳酸盐矿物，作为S盆地流体历史的指示器，在沉积岩芯提供的良好约束的构造、沉积和气候背景下。这项研究将对南极维多利亚陆盆地的地下过程及其与该地区的关系提供见解-S气候、冰冻圈和构造历史。这项工作将利用之前由美国赞助的地层钻探项目(Ciros、CRP和ANDRILL项目)回收的岩心。这项工作的动机是ANDRILL南部麦克默多海峡项目在钻井过程中在南部麦克默多海峡的地下意外发现了稠密的盐水。卤水的存在是耐人寻味的，因为它与之前关于地下流体起源的模型相矛盾，这些模型要求冰川融化水做出巨大贡献。项目目标包括通过表征成岩沉淀物来记录卤水(以及可能的其他流体)的分布。该方法将涉及岩相学和地球化学数据的集成(包括常规碳、氧和块状？同位素)，以充分描述成岩阶段，并允许发展强大的共生历史。这项工作将提供对新生代VLB演化的新见解，更广泛地说，将为冰川过程在地下流体生成中的作用提供新的见解。更广泛的影响：该项目的成果将有助于了解其他类似的现代和古代矿床中的卤水、地下水和碳氢化合物的来源，这是人们广泛感兴趣的。该项目将支持内布拉斯加州-林肯大学(UNL)的一名研究生和一名本科生的培训，提供在沉积地质学和成岩作用这两个具有广泛适用性的领域的学习机会。该提案强调通过会议介绍和对同行评审出版物的投稿，向科学界迅速传播成果。这些成果将被纳入旨在培养岩石学和成岩作用技能的教育活动中，这些技能在能源部门非常受欢迎。该项目将生成一个严格限制的数据集，使成岩阶段与整个大型沉积盆地的环境和构造变化直接联系起来，这将为联合国后勤基地高级课程(沉积岩石学和成岩作用)的全面案例研究奠定基础。此外，还将开发在线练习，并将其提交给一个专门研究沉积地质学的开放访问网站(SEPM地层网)。