Geometry and Timing of Upper Oligocene to Miocene Depostional Sequences on the U.S Middle Atlantic Margin

美国中大西洋边缘上渐新世至中新世沉积层序的几何结构和形成时间

• 批准号: 9203344
• 负责人: Gregory Mountain
• 金额: $ 31.7万
• 依托单位: Columbia University
• 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: 1992-05-01 至 1995-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9203344&HistoricalAwards=false
• 关键词: Geometry; Timing; Upper; Oligocene; Miocene

Global cycles of sea-level rise and fall have operated throughout much of Earth's history. The exact timing and size of these eustatic changes, however, are as yet comparatively poorly- constrained, particularly for Pre-Pleistocene time. Detailed sea- level history curves are, in turn, essential to understanding the complex interplay between astronomical forcing mechanisms, and glacial and sea-level maxima and minima. The geologic record spanning Oligocene to Miocene time may offer key information as to the nature and timing of sea-level changes. This time-span was characterized by a number of sea-level cycles, reflecting ice-sheet waxing and waning. The Oligocene-Miocene record is particularly well-preserved in sedimentary rocks of the Mid-Atlantic coastal plain, and continental shelf-slope-rise region. This project seeks to refine the sea-level history curves for Oligocene-Miocene time through examination of high-resolution seismic reflection, Sr-isotope, delta-Oxygen-18, and other stratigraphic data from the U.S. Mid-Atlantic coast. It is a renewal; previous work focused on the collection and preliminary analysis of the seismic reflection and biostratigraphic data. The project will impact planning and design of an upcoming Ocean Drilling Project Leg offshore New Jersey. The principal investigators are an interdisciplinary team who are well-qualified to perform this research project.

全球海平面上升和下降的周期贯穿了整个地球 地球的大部分历史 这些事件的确切时间和规模 然而，海平面的变化还比较差， 受到限制，特别是在前更新世时期。 详细海- 水平历史曲线反过来又是理解 天文强迫机制之间复杂的相互作用， 冰川和海平面的最大值和最小值。 从渐新世到中新世的地质记录 有关海平面变化的性质和时间的关键信息。 这一时间跨度的特点是有许多海平面周期， 反映了冰盖的消长 渐新世-中新世 记录在沉积岩中保存得特别好， 大西洋中部沿海平原和大陆架斜坡隆起 地区 该项目旨在完善海平面历史曲线 渐新世-中新世的高分辨率 地震反射、锶同位素、δ氧-18等 美国大西洋中部海岸的地层数据。 这是一个 更新;以前的工作集中在收集和初步 地震反射和生物地层资料分析。 的 该项目将影响即将到来的海洋的规划和设计 新泽西海上钻井项目腿。 校长 调查人员是一个跨学科的团队， 来完成这个研究项目