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

这项提议是评估内华达州东部晚古生代地壳隆起和下沉的规模、时间和类型的更广泛努力的一部分。这些盆地和相关隆起是美国西部大陆边缘晚宾夕法尼亚-二叠纪构造不稳定阶段的一部分。这些事件的构造驱动是未知的，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来评估。以前的工作集中在其中一个盆地的历史上，干山槽。在Stevens PIs工作的基础上，记录了干山槽的一般构造起源，并确认了盆地的三个明显的东西划分：东部陆架相，中央海盆相和西部边缘相。该奖项旨在对西缘相进行为期两年的深入研究。砾岩相、河流相、三角洲相和浅海相记录了形成干山槽的构造作用。pi将通过以下方式研究这些记录：(1)追踪链线的位置，帮助记录沉降历史；(2)确定基底单元的年龄和相进展，以确定构造块体，记录可能的差异沉降；(3)圈定层序地层学，从而评估持续构造活动的时间和风格。

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.