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：该项目将使用来自南极洲维多利亚陆地盆地（VLB）的沉积岩芯来研究次生（成岩）碳酸盐矿物，作为该盆地流体流动历史的指标，在​​严格约束的构造、沉积、以及沉积物岩心提供的气候背景。 这项研究将深入了解南极洲维多利亚陆地盆地的地下过程及其与该地区气候、冰冻圈和构造历史的关系。 这项工作将利用之前由美国资助的地层钻探项目（CIROS、CRP 和 ANDRILL 项目）回收的岩心。这项工作的动机是在 ANDRILL 南麦克默多海峡项目钻探期间意外地在南麦克默多海峡地下发现了浓密的盐水。盐水的存在很有趣，因为它与以前的地下流体起源模型相矛盾，这些模型需要冰川融水的大量贡献。项目目标包括通过成岩沉淀物的表征来记录盐水（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（包括常规碳、氧和“团块”同位素）的整合，以充分表征成岩阶段并允许发展稳健的共生历史。这项工作将为 VLB 的新生代演化以及更广泛的冰川过程在产生地下流体中的作用提供新的见解。更广泛的影响：该项目的结果将有助于了解其他地方类似的现代和古代矿床中盐水、地下水和碳氢化合物储层的起源，这引起了广泛的兴趣。 该项目将支持内布拉斯加大学林肯分校 (UNL) 培训一名研究生和一名本科生，提供沉积地质学和成岩作用等具有广泛适用性的领域的学习机会。 该提案强调通过会议演讲和对同行评审出版物的贡献向科学界快速传播结果。研究结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，这些技能在能源领域备受追捧。 该项目将生成一个约束良好的数据集，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 UNL 高级课程（沉积岩石学和成岩作用）的综合案例研究提供基础。此外，还将开发在线练习并将其提交到专门用于沉积地质学的开放访问网站（SEPM 地层学网站）。