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

知识价值：该项目将使用来自南极洲维多利亚陆地盆地（VLB）的沉积物岩心来研究次生（成岩）碳酸盐矿物，作为盆地的指标。在沉积物岩心提供的构造、沉积和气候背景下的流体流动历史。这项研究将深入了解南极洲维多利亚陆盆地的地下过程及其与该地区的关系。美国的气候、冰冻圈和构造史。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。这项工作的动机是在钻探过程中，ANDRILL Southern McMurdo Sound项目在south McMurdo Sound的地下意外发现了致密的盐水。盐水的存在很有趣，因为它与之前关于地下流体起源的模型相矛盾，之前的模型认为地下流体主要来自冰川融水。项目目标包括通过表征成岩沉淀物来记录盐水（以及潜在的其他流体）的分布。该方法将包括整合岩石学和地球化学数据（包括常规的碳、氧和块状碳）。同位素)，以充分表征成岩阶段，并允许发展一个健全的共生历史。这项工作将为VLB的新生代演化提供新的见解，更广泛地说，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其他地方类似的现代和古代矿床的盐水，地下水和碳氢化合物储层的起源，这是广泛感兴趣的。该项目将支持内布拉斯加大学林肯分校（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领域的学习机会，这些领域具有广泛的适用性。该提案强调通过会议报告和对同行评审出版物的贡献向科学界迅速传播结果。研究结果将纳入旨在发展岩石学和成岩作用技能的教育活动，这些技能在能源部门非常受欢迎。该项目将生成一个约束良好的数据集，可以将成岩阶段与大型沉积盆地的环境和构造变化直接联系起来，这将为UNL的高级课程（沉积岩石学和成岩作用）的综合案例研究提供基础。此外，将开发在线练习并提交给一个开放访问的网站（SEPM地层学网站），专门研究沉积地质学。

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.