Ordovician K-bentonite Stratigraphy of the Central and Southern Appalachians: Implications for Regional Strati- graphic and Tectonic Synthesis

阿巴拉契亚中部和南部奥陶纪钾膨润土地层学：对区域地层和构造综合的启示

• 批准号: 8904295
• 负责人: Warren Huff
• 金额: --
• 依托单位: University of Cincinnati Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-08-01 至 1991-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8904295&HistoricalAwards=false
• 关键词: Ordovician; bentonite; Stratigraphy; Central; Southern

PI's will study the distribution, stratigraphic correlation, chemistry and paleotectonic setting of extensive Late Ordovician K-bentonite beds in the eastern midcontinent. Work will focus on the central and southern Appalachians where previous studies indicate the Rocklandian Deicke and Millbrig K-bentonites are widespread. Establishing the correlation of these beds will define several Ordovician chronostratigraphic surfaces extending from the Mississippi Valley across the Michigan Basin and Cincinnati Arch and into the Appalachian Basin. These beds will provide regional time lines for facies correlation from platform carbonates and silliciclastics in the interior of the craton through ramp and slope carbonate deposits to both deep-water and redbed facies of the eastern Valley and Ridge. Chemical data will be evaluated according to current petrotecotnic models to interpret the tectonic setting of the source volcanoes. Results will be combined with lithostratigraphic and biostratigraphic information to produce regional chronostratigraphic, isopach and isochemical maps of the principal Ordovician K-bentonite beds in North America.

私家侦探会研究分布，地层对比， 广延晚奥陶世地球化学与古构造环境 中大陆东部的钾膨润土层。 工作将集中于 在阿巴拉契亚山脉的中部和南部， 表明Rocklandian Deicke和Millbrig K-Ekonites是 广泛传播。 建立这些层的相互关系将 确定了几个奥陶纪年代地层面， 从密西西比河谷穿越密歇根盆地， 从辛辛那提拱门进入阿巴拉契亚盆地。 这些床将 为台地相对比提供区域时间线 克拉通内部的碳酸盐和硅质碎屑岩 通过斜坡和斜坡碳酸盐沉积到深水和 东部山谷和山脊的红层相。 化学数据 将根据当前petrotecotnic模型进行评估， 解释火山源的构造背景。 结果将与岩石地层学和 生物地层学信息， 年代地层图、等厚图和等化学图 北美主要的奥陶系钾膨润土层。