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

海平面上升和下降的全球周期贯穿了地球历史的大部分时间。然而，对于这些起伏变化的确切时间和大小，特别是前更新世时期的情况，还没有明确的了解。反过来，详细的海平面历史曲线对于理解天文强迫机制与冰川和海平面最大值和最小值之间复杂的相互作用是必不可少的。渐新世至中新世的地质记录可能为海平面变化的性质和时间提供关键信息。这段时间的特点是一系列海平面周期，反映了冰盖的盛衰。渐新世-中新世记录在中大西洋沿岸平原和陆架坡升区沉积岩中保存较好。该项目旨在通过检查高分辨率地震反射、sr同位素、三角洲氧-18和其他来自美国大西洋中部海岸的地层数据，完善渐新世-中新世的海平面历史曲线。这是一种更新；以前的工作主要集中在地震反射和生物地层资料的收集和初步分析。该项目将影响即将到来的新泽西州海上钻井项目Leg的规划和设计。主要研究人员是一个跨学科的团队，他们完全有资格执行这个研究项目。

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.