Collaborative Research: Post-Impact Studies of the Chesapeake Bay Impact Structure: Quantifying Continental Margin Evolution

合作研究：切萨皮克湾撞击结构的撞击后研究：量化大陆边缘演变

• 批准号: 0606693
• 负责人: Kenneth Miller
• 金额: --
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0606693&HistoricalAwards=false
• 关键词: Collaborative; Research; Post; Impact; Studies

0606693MillerThis project will extend earlier work funded by CD involving the analysis of stratigraphy on the US Mid-Atlantic Margin. The PIs have been involved in a long term project of coring, logging, and seismic profiling of this passive margin in order to extract global sea-level change from the stratigraphic record and evaluate the role of eustasy, tectonic subsidence, and sediment input on passive continental margin sedimentation. This effort has culminated in the development of a eustatic estimate for the past 100 million years derived largely from backstripping studies of New Jersey onshore boreholes. The Chesapeake Bay Impact Structure (CBIS) has recently been drilled by the USGS (5 coreholes drilled within the crater). The PIs were involved (with CD funding) in logging the holes and have access to the cores for analysis. The PIs will evaluate the geodynamic effects of a large impact on crustal subsidence and the relative roles of global sea-level and regional tectonic changes on molding the stratigraphic record of the margin. Comparison of backstripping (accounting for the effects of sediment loading, compaction, paleowater depth, and basin subsidence) results from the 5 coreholes in the crater with previously analyzed coreholes outside the crater will allow them to quantify the effects of tectonics and global sea level. These comparisons will provide a natural experiment quantifying the relative effects of impact-generated accommodation versus "normal" thermo-flexural subsidence, sea-level, and sediment supply on the evolution of a passive continental margin. The project specifically focuses on short and long term tectonic consequences of impact, refinement of Cenozoic stratigraphy for the east coast, and improvement of the regional and global sea level curve for post-Eocene time. The project will also examine the oxygen and carbon isotopic composition of sediments deposited immediately after the impact in order to look for isotopic excursions associated with climatic effects caused by the impact.

0606693 Millerthis项目将扩展由CD资助的早期工作，其中涉及美国中大西洋边缘的地层分析。 PIS参与了该被动边缘的加油，伐木和地震分析的长期项目，以便从地层记录中提取全球海平面变化，并评估尤斯塔西式，构造沉积物和沉积物在被动大陆缘沉积中的作用。 在过去的1亿年中，这项努力最终导致了欧斯估算的发展，这主要源自对新泽西州陆井的反击研究。 Chesapeake湾冲击结构（CBI）最近由USGS钻探（火山口内的5个核孔）。 PI（并获得CD资助）记录孔，并可以访问核心进行分析。 PI将评估对地壳沉降的巨大影响以及全球海平面和区域构造变化对塑造边缘地层记录的相对作用的地球动力学影响。 对反转条的比较（考虑到陨​​石坑中的5个核孔的泥沙负载，压实，古水深和盆地沉降的影响，以及火山口以外的先前分析的核孔，它们可以量化构造和全球海平面的影响。 这些比较将提供自然的实验，以量化影响产生的适应性与“正常”热芬式沉降，海平面和沉积物供应对被动大陆边缘进化的相对影响。 该项目特别着眼于影响的短期和长期构造后果，对东海岸的新生代地层的完善以及纽约后时代的区域和全球海平面曲线的改善。 该项目还将检查撞击后立即沉积的沉积物的氧气和碳同位素组成，以寻找与撞击引起的气候作用相关的同位素偏移。