Cretaceous--Tertiary Boundary Studies Building on Recognition of the Chicxulub--Impact Crater

阿尔瓦雷斯9505451这项建议是建立在尤卡坦的奇克苏鲁布陨石坑可能是白垩纪-第三纪(KT)边界发生重大撞击的地点的基础上提出的。该项目的两个部分中的第一部分将详细研究KT Impact的产品及其原产地。将对近端喷出物和从近端喷出物到远端喷出物的过渡进行实地和实验室研究，包括在关键过渡距离处廉价钻探潜在的KT地点，这些物质将通过弹道轨迹计算与希克苏鲁布陨石坑的形成联系在一起。一个关键的问题将是撞击是单一的还是多重的，以及它是陡峭的倾斜还是低角度的倾斜。关于KT网站的信息数据库已经在顺利进行中，将扩大并向研究界提供。第二部分涉及KT撞击的环境结果，将涉及对远洋沉积岩撞击后立即记录的地层学研究，以及在KT边界撞击之前和之后不久的世界环境重建的准备工作。

Alvarez 9505451 This proposal builds on the recognition of the Chicxulub Crater in Yucatan as the probable site of a major impact at the Cretaceous-Tertiary (KT) boundary. The first of two parts of the project will be a detailed study of the products of the KT impact and their mode of origin. Field and laboratory studies of proximal ejecta and the transition from proximal to distal ejecta will be carried out, including inexpensive drilling of a potential KT site at the critical transition distance, and these materials will be tied to formation of the Chicxulub crater by calculations of ballistic trajectories. A key question will be whether the impact was single or multiple, and whether it was steeply inclined or oblique at a low angle. A database of information on KT sites, already well underway, will be expanded and made available to the research community. The second part deals with the environmental results of the KT impact, and will involve both stratigraphic study of the immediate post-impact record in pelagic sedimentary rocks and the preparation of environmental reconstructions of the world immediately before and shortly after the KT boundary impact.