Sedimentary-tectonic Evolution of Cretaceous-early Tertiary Basins in the Hinterland of the Sevier Orogenic Belt, East- central Nevada

内华达州中东部塞维尔造山带腹地白垩纪-早第三纪盆地的沉积构造演化

• 批准号: 8707594
• 负责人: James Schmitt
• 金额: $ 5.86万
• 依托单位: Montana State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-07-01 至 1989-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8707594&HistoricalAwards=false
• 关键词: Sedimentary; tectonic; Evolution; Cretaceous; early

Little is known of the depositional histories or tectonic settings of Cretaceous-early Tertiary sedimentary basins which formed in the hinterland of the Sevier orogenic belt. Numerous structural studies suggest that the hinterland was influenced by Mesozoic-early Tertiary compression and thrust faulting. Others suggest periods of extension and normal fault development. In addition, preserved hinterland basin sedimentary sequences are extremely rare. Very little detailed stratigraphic, sedimentologic, or provenance analysis has been conducted on hinterland basin deposits. The goal of this research is to better the understanding of the sedimentary- tectonic history of these hinterland basins. For this project, Cretaceous-early Tertiary hinterland basin-fill in east-central Nevada will be subjected to detailed lithostratigraphic, biostratigraphic, and petrographic analysis. Classical field methods involving detailed section measurement, description, and facies mapping, biostratigraphic and lithologic sample collection, paleocurrent measurement, and conglomerate clast counts will be combined with standard laboratory petrographic procedures. Synthesis of the data collected will be used to discern as completely as possible the following parameters concerning such basins: 1) types of depositional environments and their geographic and temporal distributions, 2) location and composition of sediment source areas as inferred from provenance of terrigeneous clastic units, 3) age relationships within the basin-fill, 4) possible changes in rates of basin subsidence as indicated by changes in fluvial style and architecture, 5) styles of tectonism in the source areas as reflected by vertical and lateral changes in sediment composition and depositional environments, and 6) geographic extent and temporal duration of individual basins.

对沉积历史或构造 早第三纪沉积盆地， 形成于塞维尔造山带腹地。 许多 结构研究表明，内陆地区受到了 中生代-第三纪早期的挤压和逆冲断层作用。 另一些人则认为存在伸展期和正断层 发展 此外，保留的腹地盆地 沉积序列极为罕见。 非常少的细节 地层学、沉积学或物源分析已经被 对内陆盆地沉积物进行了研究。 这个目标 研究是为了更好地了解沉积- 这些内陆盆地的构造历史。 为此 早第三纪腹地盆地充填 在内华达州中东部， 岩石地层学、生物地层学和岩石学分析。 涉及详细截面测量的经典现场方法， 生物地层学和岩性学描述和相图绘制 样品采集、古水流测量和砾岩 碎屑计数将与标准实验室 岩石学程序。 对收集到的数据进行综合， 用于尽可能完整地辨别以下内容 有关这些盆地的参数：1）沉积类型 环境及其地理和时间分布， 2)推断的沉积物源区的位置和组成 陆源碎屑物源; 3）时代 盆地充填物内部的关系，4） 由河流的变化表明的盆地沉降速率 风格与建筑; 5）源地构造样式 沉积物垂直和横向变化所反映的面积 组成和沉积环境，以及6）地理 个别盆地的范围和持续时间。