Geochemical and Isotopic Evolution of the Pore Waters of theCreede Formation, Colorado

科罗拉多州 Creede 地层孔隙水的地球化学和同位素演化

• 批准号: 9115780
• 负责人: Stephen Altaner
• 金额: $ 14.36万
• 依托单位: University of Illinois at Urbana-Champaign
• 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=9115780&HistoricalAwards=false
• 关键词: Geochemical; Isotopic; Evolution; Pore; Waters

The proposed study will test the hypothesis that Creede Formation sediments (Colorado) were a major source of mineralizing fluids for the Creede ore district and will quantitatively evaluate the geochemical and isotopic evolution of pore waters in the Creede Formation. The Creede Formation sediments have undergone a complicated history that appears to include low temperature alteration by fluids of controversial salinity and later hydrothermal alteration. The project will involve a combined observational and computational study to characterize the sediments and porewaters of the Creede Formation. Previously collected outcrop samples and core samples from two planned drill holes undertaken as part of the Continental Scientific Drilling Program will be studied. The mineralogy, texture, chemical and stable isotopic composition, and age of chemical sediments and authigenic minerals, including zeolites, K-feldspar, clays, carbonates, and saline minerals will be characterized. Analytical techniques will include XRD, petrography, SEM, electron microprobe, stable isotope geochemistry, and laser 39Ar/40Ar and K/Ar age dating. The principal investigators will work closely with Robert Rye (USGS, Denver) and Marvin Lansphere (USGS, Menlo Park) in the collection and interpretation of stable and radiogenic isotope data. They will also develop quantitative models of the diagenetic alteration of Creede sediments using a geochemical and isotopic mass transfer computer program. They also hope to gain new insights into this and other similar systems by incorporating a broad spectrum of mineralogical and geochemical methods with state-of-the-art geochemical and isotopic modeling to develop and integrated model of the depositional, diagenetic, and hydrothermal history of the Creede Formation.

这项拟议中的研究将检验克里德 地层沉积物（科罗拉多）是矿化的主要来源 流体的克里德矿区，并将定量评价 克里德孔隙沃茨的地球化学和同位素演化 阵 克里德组沉积物经历了 复杂的历史，似乎包括低温 盐度有争议的流体的改变， 热液蚀变 该项目将涉及一个综合 观测和计算研究，以确定沉积物的特征 以及克里德组的孔隙水 先前收集 从两个计划钻孔中采集露头样品和岩心样品 作为大陆科学钻探计划的一部分， 将被研究。 矿物学、结构、化学和稳定性 同位素组成、化学沉积物年龄和自生 矿物质，包括沸石、钾长石、粘土、碳酸盐和 盐矿物将被表征。 分析技术将 包括XRD、岩相学、SEM、电子探针、稳定同位素 地球化学、激光~（39）Ar/~（40）Ar和K/Ar定年。 校长 调查人员将与罗伯特·拉伊（美国地质勘探局，丹佛）密切合作， Marvin Lansphere（美国地质勘探局，门洛帕克）收藏， 稳定同位素和放射性同位素数据的解释。 他们将 还建立了成岩蚀变的定量模型， 利用地球化学和同位素质量传递研究克里德沉积物 电脑程序 他们也希望借此获得新的见解 和其他类似的系统， 矿物学和地球化学方法， 地球化学和同位素建模，以开发和集成模型 的沉积，成岩和热液历史， 克里德编队。