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.

知识分子的优点：该项目将使用南极维多利亚州陆盆地（VLB）的沉积物核心研究碳酸盐矿物质的二次（成岩）碳酸盐矿物，作为盆地流体历史的指标，内部在良好约束的构造，沉积，沉积和探测器中，由沉积物核提供。 这项研究将提供对维多利亚州土地盆地，南极洲及其与该地区气候，冰冻圈和构造历史的关系的见解。 这项工作将利用以前由美国赞助的地层钻探项目（Ciros，CRP和Andrill项目）回收的核心。这项工作是由于在安德里尔南部麦克穆尔多（Souther McMurdo Sound）项目钻探期间在南部麦克穆尔多（Souther McMurdo）声音的地下中意外发现的盐水而引起的。盐水的存在很有趣，因为它与以前的模型相矛盾，该模型的地下流体的起源是冰川熔体水的大量贡献。项目目标涉及通过表征成岩沉淀物来记录盐水的分布（以及潜在的其他流体）。 该方法将涉及将岩石学和地球化学数据（包括常规碳，氧气和？同位素集成）的整合，以完全表征成岩阶段并允许发展稳健的旁原病史。这项工作将为VLB的新生代演变提供新的见解，更广泛地是冰川过程在产生地下流体中的作用。更广泛的影响：该项目的结果将有助于了解盐水，地下水和碳氢化合物储层的起源，在其他地方类似的现代和古老的沉积物中，这是广泛关注的。 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，从而提供沉积地质和成岩作用的学习机会，具有广泛适用性的领域。 该提案强调通过会议演讲和对同行评审的出版物的贡献将结果迅速传播给科学界。结果将纳入旨在发展岩石学和成岩作用技能的教育活动，这些活动在能源领域受到了极大的追捧。 该项目将产生一个受约束的数据集，该数据集允许在大型沉积盆地上直接连接成岩阶段与环境和构造变化，这将为UNL的高层课程（沉积岩石学和成岩作用）中的全面案例研究提供基础。此外，在线练习将开发并提交给专门用于沉积地质学的开放访问网站（SEPM地层网络）。