TY - GEN
T1 - THE FINAL SETTLING OF METEORITIC MATTER ON THE PEAK-RING OF THE CHICXULUB IMPACT STRUCTURE AT SITE M0077A OF IODP-ICDP EXPEDITION 364
AU - Goderis, Steven
AU - Sato, Honami
AU - Ferrière, Ludovic
AU - Schmitz, Birger
AU - Burney, David
AU - Bralower, Timothy J.
AU - De Graaff, Sietze Jan
AU - Déhais, Thomas
AU - De Winter, Niels
AU - Elfman, Mikael
AU - Feignon, Jean-Guillaume
AU - Gulick, Sean P. S.
AU - Ishikawa, Akira
AU - Kaskes, Pim
AU - Koeberl, Christian
AU - Kristiansson, Per
AU - Lowery, Christopher M.
AU - Morgan, Joanna
AU - Neal, Clive R.
AU - Owens, Jeremy D.
AU - Schulz, Toni
AU - Sinnesael, Matthias
AU - Smit, Jan
AU - Vellekoop, Johannes
AU - Whalen, Michael T.
AU - Wittmann, Alex
AU - Vanhaecke, Frank
AU - Van Malderen, Stijn
AU - Claeys, Philippe
PY - 2019
Y1 - 2019
N2 - 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.
AB - 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.
M3 - Conference contribution
BT - Large Meteorite Impacts VI 2019 (LPI Contrib No. 2136)
PB - Lunar and Planetary Institute
ER -