SHRIMP Ion Microprobe Investigation of Fine-scale Sulfur Isotopic Systematics in the Creed Moat Sediments

克里德矿脉区是世界级的超热液基地 与第三纪大破火山口有关的金属硫化物存款 聚集在科罗拉多。 因为沉积的，成岩的， 火山碎屑沉积物的热液历史 克里德火山口护城河对于了解 流体、硫和金属进入区域脉成矿， 我们建议对精细尺度（30 μ m） 护城河沉积物硫同位素系统学研究 离子微探针 稳定同位素分析的微束技术 提供了对矿化过程的深刻见解，因为矿物 包含更多关于其起源和后续的信息 比常规的散装同位素 取样和分析技术。 主要研究者将把他们的经验应用于 解析湖泊中精细尺度的硫同位素变化， 火山环境与克里德护城河沉积物之间的联系 与其他克里德项目提出的大量同位素研究 科学家 他们将特别关注微观硫 同位素变化记录了临界沉积和成岩作用 事件，以及对改进的克里德模型的任何贡献， 并将促进我们对时间和相互作用的理解， 沉积、成岩和热液成矿作用 浅层地壳环境。

The Creede vein district is a world-class epithermal base metal sulfide deposit associated with a large Tertiary caldera cluster in Colorado. Because the sedimentary, diagenetic and hydrothermal history of the volcaniclastic sediments filling the Creede caldera moat is critical to understanding the cycling of fluids, sulfur and metals into the district vein mineralization, we propose a comprehensive investigation of fine-scale (30 um) sulfur isotopic systematics in the moat sediments using the SHRIMP ion microprobe. Microbeam techniques of stable isotope analysis offer great insight into mineralizing processes, because minerals contain more information concerning their origins and subsequent modifications than can be obtained by conventional bulk isotopic sampling and analytical techniques. The principal investigators will apply their experience in resolving fine-scale sulfur isotopic variations in lacustrine and volcanic environments to the Creede moat sediments, in cooperation with bulk isotopic studies proposed by other Creede project scientists. In particular, they will focus on microscopic sulfur isotope variations that record critical sedimentary and diagenetic events, as well as any contribute towards an improved Creede model, and will advance our understanding of the timing and interplay of sedimentary, diagenetic and hydrothermal ore-forming processes in shallow crustal environments.