COLLABORATIVE RESEARCH: Post-Impact Studies of the Chesapeake Bay Impact Structure: Implications for Continental Margin Evolution and Groundwater Resources

这个项目涉及对切萨皮克湾撞击结构(CBIS)中USGS/ICDP钻井项目的材料进行分析。ICDP和美国地质调查局已提供资金，在弗吉尼亚州查尔斯角的CBIS中央盆地钻了一个2.2公里长的钻孔，目的是：1)撞击研究，以限制陨石坑的结构和形态、陨石坑深度、中央陨石坑的结构特征，以及陨石坑材料的地层学、岩石物理、化学和矿物学；2)从上始新世到最近的剖面(~36-0 My)的撞击后研究；以及3)水文地质学和深层生物圈研究。具体地说，这些资金将支持PI与新泽西地质调查局(NJGS)、特拉华地质调查局(DGS)、美国地质调查局和国际机构的合作者一起，参与查尔斯角撞击后部分的现场分析、钻井后分析和存档。撞击后研究的科学目标包括：1)记录撞击造成的约35.7 Ma的局部生物危机和恢复以及高能撞击的物理影响；2)评估陨石坑、其他构造、海平面、气候和沉积物供应变化对大西洋中部大陆边缘长期演化的影响。PI的团队将特别专注于将查尔斯角中央盆地岩心孔撞击后的部分与在环形槽和火山口外钻取的岩心孔进行比较，特别是新泽西州和特拉华州的上始新世至中新世的准确年代段。

0506726KominzThis project involves the analysis of material from the USGS/ICDP drilling project in the Chesapeake Bay Impact Structure (CBIS). ICDP and the USGS have provided funds to drill a 2.2 km borehole in the central basin of the CBIS at Cape Charles, VA for the purposes of: 1) impact studies, to constrain the crater structure and morphology, crater depth, the structural character of the central crater, and the stratigraphy, petrophysics, chemistry, and mineralogy of crater materials; 2) post-impact studies of the upper Eocene to Recent section (~36 - 0 My); and 3) hydrogeology and deep biosphere studies. Specifically, these funds will support the PI's efforts to participate in field analyses, post drilling analyses, and archiving of the post-impact section at Cape Charles in conjunction with collaborators at the New Jersey Geological Survey (NJGS), the Delaware Geological Survey (DGS), the USGS and international institutions. The scientific goals of the post-impact studies include: 1) documentation of the impact-produced local biotic crisis and recovery at ca. 35.7 Ma and the physical effects from a high-energy impact; 2) evaluation of the effects of cratering, other tectonic, sea-level, climate and sediment supply changes on the long-term evolution of the mid-Atlantic continental margin. The PI's team will focus particularly on comparing the post-impact section from the Cape Charles central basin corehole with coreholes drilled in the annular trough and outside the crater, especially well-dated upper Eocene through Miocene sections in New Jersey and Delaware.