Deciphering the Complex History of Fluid Flow in Lower Carboniferous Carbonate Rocks, Irish Midlands: Geochemistry of Multiple Dolomitizing and Ore-Forming Events

破译爱尔兰中部地区下石炭统碳酸盐岩流体流动的复杂历史：多次白云石化和成矿事件的地球化学

• 批准号: 0106388
• 负责人: Kevin Shelton
• 金额: $ 9.5万
• 依托单位: University of Missouri-Columbia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-08-01 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0106388&HistoricalAwards=false
• 关键词: Deciphering; Complex; History; Fluid; Flow

ABSTRACTDeciphering the Complex History of Fluid Flow in Lower Carboniferous Carbonate Rocks, Irish Midlands: Geochemistry of Multiple Dolomitizing and Ore-Forming EventsKevin L. Shelton & Jay M. GreggEAR-0106388 The Irish Midlands comprise a natural laboratory in which to study the physical, thermal and geochemical effects of fluid flow on dolomitization and zinc-lead ore deposition in an extensional/compressional tectonic setting. Our research addresses the relationships among sedimentary facies, early diagenesis and hydrothermal dolomitization, and their relationship to localized and regional fluid flow throughout Lower Carboniferous carbonate rocks in Ireland. Specific questions to be addressed are applicable to the Irish Midlands, as well as to similar extensional/compressional basinal settings worldwide: What are the sources of various multiple fluids and the extents of their flow systems?; What is the relative timing of each fluid system?; What are the critical fluid-fluid and fluid-rock interactions along flow paths that led to hydrothermal dolomitization and/or ore deposition?; What is the relative importance of regional-scale fluid flow through aquifers versus localized fracture-controlled flow for the development of mineral deposits? Our study will address these questions through combined application of carbonate petrology and a number of geochemical tools, including C, O and Sr isotopes, fluid inclusion microthermometry, and fluid inclusion halogen and trace element geochemistry, including new laser ablation-ICP-MS techniques. The impact of this study is profound and timely. Modelers are now expanding the capability of reactive flow hydrogeologic-geochemical models to simulate groundwater chemistry, patterns of rock alteration and ore mineralization in fractured rock. Geochemical data from our studies of chemical interactions of basinal fluids along stratigraphic and faulted pathways will provide an excellent basis for constraining theoretical models of deep fluid flow that are being developed for the Irish Midlands.

摘要将较低的碳酸盐岩岩石中流体流动的复杂历史，爱尔兰中部地区：多种白云油化和矿石形成的事件的地球化学Kevevin L. Shelton＆Jay M. Greggear-0106388爱尔兰中部地区构成了一种自然实验室，以研究物理，热量和地球效应的自然实验室，该实验室效应效应效应，层次效应效应，构成效应，构成效应，效应效果，效应效果，使其效应效应，并构成效应的效果。在延伸/压缩的构造设置中。 我们的研究探讨了沉积相，早期成岩作用和水热油化物之间的关系，以及它们与爱尔兰下部石炭纪碳酸盐岩岩石中局部和区域流体流的关系。 要解决的具体问题适用于爱尔兰中部地区，以及在全球范围内类似的延伸/压缩盆地环境：各种多种流体的来源以及其流量系统的范围是什么？每个流体系统的相对时机是什么？沿流动路径的临界流体流体和流体 - 岩石相互作用是什么导致水热的白云岩和/或矿石沉积？通过含水层与局部裂缝控制流的区域尺度流体流对矿藏的发展的相对重要性是什么？ 我们的研究将通过联合应用碳酸盐质学和许多地球化学工具来解决这些问题，包括C，O和SR同位素，流体包容性微热计量法以及流体包容卤素和痕量元素地球化学，包括新的激光ABER ABERARATION-ICP-MS ICP-MS技术。 这项研究的影响是深刻而及时的。建模者现在正在扩展反应性流水文地质地球化学模型的能力，以模拟地下水化学，岩石改变的模式和破裂的岩石中的矿石矿化。 从我们对沿地层和断层途径的盆地流体化学相互作用的研究中的地球化学数据将为限制为爱尔兰中部地区开发的深流体流动的理论模型提供了极好的基础。