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Peering inside the peak ring of the Chicxulub Impact Crater—its nature and formation mechanism
Author(s) -
UrrutiaFucugauchi Jaime,
PérezCruz Ligia,
Morgan Joanna,
Gulick Sean,
Wittmann Axel,
Lofi Johanna
Publication year - 2019
Publication title -
geology today
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.188
H-Index - 17
eISSN - 1365-2451
pISSN - 0266-6979
DOI - 10.1111/gto.12261
Subject(s) - impact crater , geology , breccia , impact structure , ejecta , borehole , peering , petrology , basement , sequence (biology) , outcrop , geochemistry , paleontology , archaeology , astrobiology , physics , genetics , the internet , quantum mechanics , supernova , world wide web , computer science , biology , history
The IODP‐ICDP Expedition 364 drilled into the Chicxulub crater, peering inside its well‐preserved peak ring. The borehole penetrated a sequence of post‐impact carbonates and a unit of suevites and clast‐poor impact melt rock at the top of the peak ring. Beneath this sequence, basement rocks cut by pre‐impact and impact dykes, with breccias and melt, were encountered at shallow depths. The basement rocks are fractured, shocked and uplifted, consistent with dynamic collapse, uplift and long‐distance transport of weakened material during collapse of the transient cavity and final crater formation.