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.

渐新统克里德沉积和火山岩地层 研究中遇到的地层（圣胡安山脉，科罗拉多） 将对勘探岩心进行检查，以评估 沉积环境及成岩作用的控制因素 intracaldera环境。 该项目将补充正在进行的 沉积环境和成岩作用的地面研究 克里德编队。 将确定沉积环境 根据露头研究建立的标准， 将收集基于沉积相的系列。 岩石学 矿物学检查也将用于确定 成岩事件序列 岩心地层对比 和地表剖面将为解释 跨护城河的沉积模式和成岩作用的变化。 的 结果将提供（1）一个更完整的沉积模式 在一个intracaldera环境中，（2）更好地了解 一个复杂的成岩系统，在克里德之后运作 沉积，（3）用于建模结构和 （4）火山口护城河盆地的沉积演化; 沉积学框架来检验克里德 沉积物在流体演化中起着重要作用 负责克里德地区的矿化。