Sedimentation and Diagenesis of the Creede Fm., CO: Subsurface Evaluation and Correlation with Outcrop Studies

科罗拉多州 Creede 组的沉积和成岩作用：地下评估及其与露头研究的相关性

• 批准号: 9116021
• 负责人: Laura Crossey
• 金额: $ 8.7万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-01-01 至 1994-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9116021&HistoricalAwards=false
• 关键词: Sedimentation; Diagenesis; Creede; Fm.; CO

Sedimentary and volcaniclastic strata of the Oligocene Creede Formation (San Juan Mountains, Colorado) encountered in research and exploration cores will be examined in order to evaluate environments of sedimentation and controls on diagenesis in an intracaldera environment. The project will complement ongoing surface study of depositional environments and diagenesis of the Creede Formation. Depositional environments will be identified based on criteria established from outcrop study, and a sample suite based on sedimentary facies will be collected. Petrologic and mineralogic examination will also be used to identify the sequence of diagenetic events. Stratigraphic correlation of core and surface sections will provide a framework for interpreting cross-moat changes in depositional patterns and diagenesis. The results will provide (1) a more complete model for sedimentation in an intracaldera environment, (2) a better understanding of the complex diagenetic system that operated following Creede deposition, (3) constraints for modeling the structural and depositional evolution of caldera moat basins, and (4) a sedimentologic framework for testing the hypothesis that Creede sediments played a major role in the evolution of fluids responsible for Creede district mineralization.

将检查研究和勘探岩心中遇到的渐新世 Creede 组（科罗拉多州圣胡安山）的沉积岩和火山碎屑岩地层，以评估火山口内环境中的沉积环境和成岩作用控制。 该项目将补充正在进行的 Creede 地层沉积环境和成岩作用的表面研究。 将根据露头研究建立的标准来确定沉积环境，并收集基于沉积相的样本套件。 岩石学和矿物学检查也将用于确定成岩事件的顺序。 核心和表面部分的地层对比将为解释沉积模式和成岩作用的跨护城河变化提供框架。 研究结果将提供（1）更完整的火山口内环境沉积模型，（2）更好地了解克里德沉积后运行的复杂成岩系统，（3）模拟火山口护城河盆地的结构和沉积演化的约束，（4）一个沉积学框架，用于检验克里德沉积物在负责克里德地区矿化的流体演化中发挥重要作用的假设。