The Chicxulub Impact and the Cretaceous-Paleogene Boundary - New Findings and Perspectives

Explore the latest findings and perspectives on the Chicxulub impact and the Cretaceous/Paleogene boundary in this 2-hour conference session from the 2017 AGU Fall Meeting. Delve into detailed analyses of the peak ring crater, gravity field comparisons, and nested melt crater models. Examine dynamic collapse models, peak ring formation mechanisms, and acoustic fluidization simulations. Investigate high-resolution velocity models and their implications for understanding the impact structure. Learn about universal stage measurements, thin section analyses, and numerical simulations of the Chicxulub hydrothermal system. Discover the thermal modeling, differential metasomatic alteration, and chemical zoning observed in the impact crater. Gain insights into the habitability potential and energy sources associated with impact events. Presented by leading experts in planetary sciences, geophysics, and geochemistry, this session offers a comprehensive overview of cutting-edge research on one of Earth's most significant impact events.

Intro
Peak Ring Crater
Gravity field comparison
Nested melt crater model
Dynamic collapse model
Peak rings
Results
Mechanism
ICL Simulation
Acoustic Fluidization
Summary
Gail Christensen
Peak Ring
Analyses
Measurements
The Results
Interpretation
New HighResolution Velocity Models
Implications
Highresolution velocities
Oriole Ray
Objectives
Presentation
Universal Stage Measurements
Orientations
Thin Sections
Numerical Simulations
Chicxulub Hydrothermal System
Thermal Model
Differential Metasomatic Alteration
Backscatter Electron Image
Pervasive Alteration
Chemical Zoning
Amethyst
Closeup views
Open cavities
Calcite
Habitability
Energy Sources
Impact Events
Conclusions