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.

智力优势：该项目将使用南极洲维多利亚陆地盆地（VLB）的沉积物岩心，研究次生（成岩）碳酸盐矿物，作为该盆地的指标。的流体流动的历史，以及约束构造，沉积和气候背景下提供的沉积岩芯。 这项研究将提供深入了解地下过程在维多利亚陆盆地，南极洲和他们的关系，该地区？的气候、冰冻圈和构造历史。 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）回收的岩心。这项工作的动机是意外发现的致密盐水在地下的南麦克默多声音钻探期间的安德里尔南麦克默多声音项目。盐水的存在是有趣的，因为它与以前的地下流体起源模型相矛盾，该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记录盐水（和潜在的其他流体）的分布。 该方法将涉及整合岩相学和地球化学数据（包括常规的碳，氧，和？结块的？同位素），以充分表征成岩阶段，并允许一个强大的共生历史的发展。这项工作将提供新的见解新生代演化的VLB，更广泛地说，冰川过程中产生地下流体的作用。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、地下水和油气藏的起源，这具有广泛的意义。 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，提供沉积地质学和成岩作用的学习机会，这些领域具有广泛的适用性。 该提案强调通过会议介绍和对同行评审出版物的贡献，将成果迅速传播给科学界。研究结果将被纳入旨在培养能源部门非常需要的岩相学和成岩作用技能的教育活动。 该项目将产生一个约束良好的数据集，允许直接链接成岩阶段的环境和构造变化在一个大型沉积盆地，这将提供一个全面的案例研究的基础上，在一个高级课程（沉积岩相学和成岩作用）在UNL。此外，还将编制在线练习，并提交给一个专门讨论沉积地质学的开放式网站（SEPM地层学网站）。