IODP/ICDP Expedition 364; Drilling the Cretaceous-Paleogene Chicxulub impact crater; insights into large craters formation and their effect on life.

Author(s): Gulick, Sean P. S.; Morgan, Joanna V.; Urrutia Fucugauchi, Jaime; Bralower, Timothy J.; Chenot, Elise; Christeson, Gail Lynn; Claeys, Philippe; Cockell, Charles S.; Collins, Gareth S.; Coolen, Marco J. L.; Gebhardt, Catalina; Goto, Kazuhisa; Kring, David A.; Xiao Long; Lowery, Christopher; Mellett, Claire; Ocampo-Torres, Ruben; Osinski, Gordon R.; Perez-Cruz, Ligia L.; Pickersgill, Annemarie; Poelchau, Michael H.; Rae, Auriol; Rasmussen, Cornelia; Rebolledo-Vieyra, Mario; Riller, Ulrich Peter; Sato, Honami; Schmitt, Douglas R.; Smit, Jan; Tikoo, Sonia; Tomioka, Naotaka; Whalen, Michael T.; Zylberman, William; Jones, Heather; Gareth, Carter; Wittmann, Axel; Lofi, Johanna; Yamaguchi, Kosei E.; Ferrière, Ludovic
Author Affiliation(s): Primary:
University of Texas at Austin, Austin, TX, United States
Other:
Imperial College London, United Kingdom
Universidad Nacional Autonoma de Mexico, Mexico
Pennsylvania State University, United States
Universite de Bourgogne, France
University of Texas Institute of Geophysics, United States
Vrije Universiteit Brussel, Belgium
University of Edinburgh, United Kingdom
Curtin University, Australia
Alfred Wegener Institute, Germany
Tohoku University, Japan
Universities Space Research Association Houston, United States
China University of Geosciences, China
British Geological Survey, United Kingdom
Université de Strasbourg, France
University of Western Ontario, Canada
University of Glasgow, United Kingdom
University of Freiburg, Germany
University of Utah, United States
Centro de Investigacion Cientifica de Yucatan (CICY), Mexico
Geologisch-Pal. Institut, Germany
Japan Agency for Marine-Earth Science and Technology, Japan
University of Alberta, Canada
Vrije University Amsterdam, Netherlands
Rutgers University New Brunswick, United States
University of Alaska Fairbanks, United States
CEREGE, France
Arizona State University, United States
Géosciences Montpellier, France
Toho University, Japan
Natural History Museum Vienna, Austria
Volume Title: AGU 2016 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2016; American Geophysical Union 2016 fall meeting, San Francisco, CA, Dec. 12-16, 2016. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: An international project to drill the Chicxulub impact crater was conducted in April and May, 2016 as Expedition 364 of the International Ocean Discovery Program (IODP) and International Continental Scientific Drilling Project (ICDP). Site M0077 is located offshore Yucatan in the southern Gulf of Mexico. The target was to core the only pristine terrestrial peak ring and to measure physical properties of the entire borehole. Specific questions included: What rocks comprise a topographic peak ring? How are peak rings formed? How are rocks weakened during large impacts to allow them to collapse and form relatively wide, flat craters? What insights arise from biologic recovery in the Paleogene within a potentially "toxic" ocean basin? Are impact craters (including peak rings) habitats for life? Coring occurred from 503-1334.7 mbsf with nearly 100% recovery. Wireline logs were collected from ultra slimline tools to total depth including gamma ray, magnetic susceptibility, sonic, borehole fluid temperature and conductivity, resistivity data, borehole images, and a finely spaced vertical seismic profile. Stratigraphy cored included ∼110 m of Eocene and Paleocene carbonates, ∼130 m of allochthonous impactites, and ∼590 m of crustal basement with dikes. All cores were measured using a shipboard core logger (density, gamma ray, magnetic susceptibility and resistivity) and shore-based dual energy, 0.3 mm resolution CT scanner. These data allow us to: 1) refine numerical models of the formation of the Chicxulub impact structure; 2) place constraints on environmental perturbations that led to the K-Pg mass extinction; 3) improve simulations of impact craters on other planetary bodies; 4) examine deformation mechanisms for insights into how rocks weaken during impacts; 5) study impact generated hydrothermal systems and 6) understand the effects of impacts on the deep biosphere including as a habitat for microbial life with implications for evolution on Earth and astrobiology. Key results are that the Chicxulub peak ring is formed from fractured basement rocks that may host a subsurface biosphere. The impactite layer overlying the peak ring in turn provides insight into resurge and tsunami processes, while the Paleogene sediments contain the record of the recovery of life after the mass extinction event.
Year of Publication: 2016
Research Program: IODP2 International Ocean Discovery Program
Key Words: 07 Marine Geology and Oceanography; Cenozoic; Chicxulub Crater; Craters; Cretaceous; Expedition 364; Geophysical methods; Geophysical profiles; Geophysical surveys; Impact craters; Impact features; International Continental Scientific Drilling Program; International Ocean Discovery Program; Mesozoic; Paleogene; Seismic methods; Seismic profiles; Surveys; Tertiary
Record ID: 2017102812
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States

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