Shock-deformed zircon from the Chicxulub impact crater and implications for cratering process
Autor: | Zhao, Jiawei, Xiao, Long, Xiao, Zhiyong, Morgan, Joanna, Osinski, Gordon, Neal, Clive, Gulick, Sean P.S., Riller, Ulrich, Claeys, Philippe, Zhao, Shanrong, Prieur, Nils, Nemchin, Alexander, Yu, Shuoran, Chenot, Elise, Christeson, Gail l., Cockell, Charles S., Coolen, Marco J.L., Ferrière, Ludovic, Gebhardt, Catalina, Goto, Kazuhisa, Jones, Heather, Kring, David A., LOFI, Johanna, Lowery, Christopher M., OCAMPO-TORRES, Ruben, Perez-Cruz, Ligia, Pickersgill, Annemarie E., Poelchau, Michael H., Rasmussen, Cornelia, Rebolledo-Vieyra, Mario, Sato, Honami, Smit, Jan, Tikoo-Schantz, Sonia M., Tomioka, Naotaka, Urrutia Fucugauchi, Jaime, Whalen, Michael T., Wittmann, Axel, Yamaguchi, Kosei E. |
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Přispěvatelé: | Institut de chimie et procédés pour l'énergie, l'environnement et la santé (ICPEES), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Natural Environment Research Council (NERC), Analytical, Environmental & Geo-Chemistry, Earth System Sciences, Chemistry |
Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Geochemistry & Geophysics
Reidite 010504 meteorology & atmospheric sciences 04 Earth Sciences Geology zircon 010502 geochemistry & geophysics 01 natural sciences Shock (mechanics) Shock metamorphism Impact crater 13. Climate action [SDU]Sciences of the Universe [physics] Scientific method microstructures shock metamorphism Petrology Cratering 0105 earth and related environmental sciences Zircon |
Zdroj: | Geology Geology, Geological Society of America, 2021, ⟨10.1130/G48278.1⟩ |
ISSN: | 0091-7613 |
Popis: | International audience; Large impact structures with peak rings are common landforms across the solar system, and their formation has implications for both the interior structure and thermal evolution of planetary bodies. Numerical modeling and structural studies have been used to simulate and ground truth peak-ring formative mechanisms, but the shock metamorphic record of minerals within these structures remains to be ascertained. We investigated impact-related microstructures and high-pressure phases in zircon from melt-bearing breccias, impact melt rock, and granitoid basement from the Chicxulub peak ring (Yucatán Peninsula, Mexico), sampled by the International Ocean Discovery Program (IODP)/International Continental Drilling Project (IODP-ICDP) Expedition 364 Hole M0077A. Zircon grains exhibit shock features such as reidite, zircon twins, and granular zircon including “former reidite in granular neoblastic” (FRIGN) zircon. These features record an initial high-pressure shock wave (>30 GPa), subsequent relaxation during the passage of the rarefaction wave, and a final heating and annealing stage. Our observed grain-scale deformation history agrees well with the stress fields predicted by the dynamic collapse model, as the central uplift collapsed downward-then-outward to form the peak ring. The occurrence of reidite in a large impact basin on Earth represents the first such discovery, preserved due to its separation from impact melt and rapid cooling by the resurging ocean. The coexistence of reidite and FRIGN zircon within the impact melt–bearing breccias indicates that cooling by seawater was heterogeneous. Our results provide valuable information on when different shock microstructures form and how they are modified according to their position in the impact structure, and this study further improves on the use of shock barometry as a diagnostic tool in understanding the cratering process. |
Databáze: | OpenAIRE |
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