Future drilling of the Chicxulub impact crater

Author(s): Morgan, Joanna V.; Urrutia, Jaime; Gulick, Sean; Christeson, Gail; Grieve, Richard; Warner, Mike; Barton, Penny; Rebolledo, Mario; Melosh, Jay
Author Affiliation(s): Primary:
Imperial College London, Department of Earth Science and Engineering, London, United Kingdom
University of Texas at Austin, United States
Natural Resources Canada, Canada
University of Cambridge, United Kingdom
CICY, Mexico
University of Arizona, United States
Volume Title: Geological Society of America, 2006 annual meeting
Source: Abstracts with Programs - Geological Society of America, 38(7), p.120; Geological Society of America, 2006 annual meeting, Philadelphia, PA, Oct. 22-25, 2006. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0016-7592 CODEN: GAAPBC
Note: In English
Summary: Chicxulub is the best preserved large impact crater on Earth and, as such, assumes a crucial role in providing information on large-scale cratering processes and the global effects of such events. As the crater is buried ∼1 km beneath the Yucatan surface, its structure has to be determined through geophysical exploration and drilling. Of most importance in these endeavors have been two seismic experiments acquired in 1996 and 2005, and a number of onshore exploration and scientific holes drilled by PeMex, UNAM and ICDP. However, to date, there are no drill holes offshore, nor any holes that penetrate the crater lithologies at depths of greater than 1650 m, hence there remain significant unknowns about the structure of this crater and the formation of large craters in general. To address this, a proposal for future joint IODP/ICDP drilling of this crater will be considered at a workshop in Potsdam in September 2006. Three holes have been previously proposed to IODP and ICDP: Chicx-01A, Chicx-02A and ICDP-2. Chicx-01A is an offshore hole through the target rocks aimed at characterizing their chemistry, porosity and volatile content, and quantifying the environmental effects of this impact. This hole will allow us to determine whether the thickness of the Cretaceous sediments increase offshore as suggested by the seismic reflection data. This is significant because the release of volatiles from these sediments are thought to have been particularly environmentally damaging. The aim of Chicx-02A is to penetrate the crater's peak ring and test models for peak ring formation. This is fundamental to understanding the cratering process as it tells us about the mechanics of large crater formation. If we can better understand crater formation on Earth, we can use impact craters as a diagnostic tool to probe the near surface of other planetary bodies. ICDP-2 will penetrate the impact melt rocks and central uplift, and will be used to characterize the petrology and geochemistry of the melts rocks, and determine the total volume of melt. In this presentation we will outline the results of deliberations at the workshop, and plans for future drilling at Chicxulub.
Year of Publication: 2006
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 23 Surficial Geology, Geomorphology; Characterization; Chicxulub Crater; Drilling; Effects; Future; Geochemistry; Geophysical methods; Geophysical surveys; Global; Impact craters; Impact features; Integrated Ocean Drilling Program; International Continental Scientific Drilling Program; Mechanics; Melts; Mexico; Models; Processes; Seismic methods; Surveys; Uplifts; Yucatan Peninsula
Record ID: 2008068951
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States

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