Lower Permian Dry Mountain Trough: Case Study for Recogni- tion of Widespread Post-Antler Continental Margin Tectonism

下二叠统干山槽：认识广泛分布的鹿角后大陆边缘构造作用的案例研究

• 批准号: 9004909
• 负责人: Walter Snyder
• 金额: --
• 依托单位: Boise State University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-07-15 至 1992-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9004909&HistoricalAwards=false
• 关键词: Lower; Permian; Dry; Mountain; Trough

This proposal is part of a broader effort to assess the magnitude, timing, and style of Late Paleozoic crustal uplifts and subsidence in eastern Nevada. These basins and associated uplifts are part of a recently recognized phase of Late Pennsylvanian-Permian tectonic instability along the continental margin of the Western U.S. The tectonic drive for these events is unknown and can be assessed only through basin analysis based on integrated and detailed biostratigraphic and lithostratigraphic studies. Previous work has concentrated on the history of one of these basins,the Dry Mountain Trough. Building on the work of Stevens PIs have documented the general tectonic origin of the Dry Mountain Trough, and recognized three distinct east-west divisions of the basin: Eastern Shelf Facies, Central Basinal Facies, and Western Margin Facies. This award is for a two-year intensive study of the Western Margin Facies. The conglomeratic, fluvial to deltaic to shallow marine Western Margin Facies records the tectonism that created the Dry Mountain Trough. PIs will study this record by: (1) tracking the position of the strandline to help document the subsidence history, (2) determining the age and facies progression of the basal units to define structural blocks and document possible differential subsidence, and (3) delineating the sequence stratigraphy and thus assess the timing and style of continued tectonism.

这一建议是评估内华达州东部晚古生代地壳隆起和沉降的规模、时间和风格的更广泛努力的一部分。这些盆地和相关隆起是最近认识到的美国西部大陆边缘沿着晚宾夕法尼亚-二叠纪构造不稳定阶段的一部分。这些事件的构造驱动力尚不清楚，只能通过基于综合和详细的生物地层学和岩石地层学研究的盆地分析进行评估。以前的工作集中在这些盆地之一的历史，干山槽。在史蒂文斯工作的基础上，PI记录了干山槽的一般构造起源，并认识到盆地的三个不同的东西部：东部陆架相，中央盆地相和西部边缘相。该奖项是对西部边缘相的为期两年的深入研究。砾岩、河流、三角洲和浅海西部边缘相记录了形成干山槽的构造作用。PI将通过以下方式研究该记录：（1）跟踪岸线的位置，以帮助记录沉降历史;（2）确定基底单元的年龄和相进展，以确定结构块并记录可能的差异沉降;以及（3）描绘层序地层，从而评估持续构造作用的时间和样式。