The Cretaceous-Tertiary Boundary: Event Studies and Crater Search

白垩纪-第三纪边界：事件研究和陨石坑搜索

• 批准号: 9105297
• 负责人: Walter Alvarez
• 金额: $ 12.07万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-07-15 至 1994-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9105297&HistoricalAwards=false
• 关键词: Cretaceous; Tertiary; Boundary; Event; Studies

The impact explanation for the Cretaceous-Tertiary (KT) boundary mass extinction has received much support and confirmation, although it continues to be challenged. As part of the ongoing study of this problem by many scientists worldwide, two lines of investigation are proposed: (1) detailed stratigraphic study of the sequence of events during the boundary crisis, and (2) search for an impact crater on oceanic crust by studying possible tsunami effects on continental slopes and margins. (1) The stratigraphic study will use numerous Apennine KT boundary sections deposited near the CCD, which are sensitive to paleoceanographic changes. Recent work shows that abnormal reducing and corrosive conditions resulted from the KT event in this environment, and the character and duration of these events, and their relation to fluctuations in the iridium profile and the occurrence of impact signatures will be examined. (2) Recent work by others strongly suggests impact in the Southern U.S. -Caribbean-Gulf of Mexico area. Work on sections proximal to the impact site will yield detailed understanding of the impact event.

第三纪（KT）的影响解释 边界大灭绝得到了很多支持， 这一点得到了证实，但仍受到质疑。 的一部分 世界上许多科学家正在对这个问题进行研究， 提出了研究思路：（1）详细地层 研究边界危机期间的事件序列，以及（2） 通过研究可能的撞击坑， 海啸对大陆坡和大陆边的影响。 (1)地层研究将使用大量的亚平宁KT 沉积在CCD附近的边界部分，对 古海洋学变化 最近的研究表明， KT事件导致的还原和腐蚀条件， 这种环境，以及这些事件的性质和持续时间， 及其与铱剖面波动的关系 将检查撞击特征的出现。 (2)其他人最近的工作强烈表明， 美国南部-加勒比海-墨西哥湾地区。 各节的工作 在撞击点附近， 撞击事件。