THE FINAL SETTLING OF METEORITIC MATTER ON THE PEAK-RING OF THE CHICXULUB IMPACT STRUCTURE AT SITE M0077A OF IODP-ICDP EXPEDITION 364

Steven Goderis, Honami Sato, Ludovic Ferrière, Birger Schmitz, David Burney, Timothy J. Bralower, Sietze Jan De Graaff, Thomas Déhais, Niels De Winter, Mikael Elfman, Jean-Guillaume Feignon, Sean P. S. Gulick, Akira Ishikawa, Pim Kaskes, Christian Koeberl, Per Kristiansson, Christopher M. Lowery, Joanna Morgan, Clive R. Neal, Jeremy D. OwensToni Schulz, Matthias Sinnesael, Jan Smit, Johannes Vellekoop, Michael T. Whalen, Alex Wittmann, Frank Vanhaecke, Stijn Van Malderen, Philippe Claeys

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Abstract

Introduction: The ~66.0 Myr old, ~200 km diameter Chicxulub impact structure marks the K/Pg boundary and is the only terrestrial crater with an unequivocal peak-ring. In 2016, the International Ocean Discovery Program (IODP) and the International Continental Scientific Drilling Program (ICDP) jointly drilled the 1335 m deep Site M0077A into the Chicxulub peak ring offshore the Yucatán Peninsula and successfully recovered a continuous core from 505.7 to 1334.7 mbsf (meters below sea floor). The core is mainly composed of three lithological units: ~110 m of Paleogene sedimentary rocks (post-impact interval), ~130 m of suevite and impact melt rock (upper peak-ring interval), and ~610 m of granitoid basement, intruded by pre-impact dikes and intercalated with suevites and impact melt rocks [1].
This abstract focuses on Core 40R-Section 1 (616.24‒617.68 mbsf), which samples the ~75 cm “transitional unit” between the upper impactites and early Paleogene sediment. This unique interval of the core, marked by siderophile element enrichments and pyrite-rich intervals, is studied here in detail to better constrain the final phases of impact crater formation and determine the fate of the Chicxulub impactor.
Original languageEnglish
Title of host publicationLarge Meteorite Impacts VI 2019 (LPI Contrib No. 2136)
Subtitle of host publicationAbstract 5068
Place of PublicationHouston, TX
PublisherLunar and Planetary Institute
ChapterVI
Pages1-2
Number of pages2
Volume6
Publication statusPublished - 2 Oct 2019
EventLarge Meteorite Impacts and Planetary Evolution VI: LMIVI 2019 - FINATEC - University of Brasilia, Brasilia, Brazil
Duration: 28 Sep 20193 Oct 2019
Conference number: VI
https://www.sympla.com.br/vi-lmi---large-meteorite-impacts-and-planetary-evolution-vi__576076

Conference

ConferenceLarge Meteorite Impacts and Planetary Evolution VI
Abbreviated titleLMIVI 2019
Country/TerritoryBrazil
CityBrasilia
Period28/09/193/10/19
Internet address

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