The formation of peak rings in large impact craters

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doi: 10.1126/science.aah6561
Author(s): Morgan, Joanna V.; Gulick, Sean P. S.; Bralower, Timothy J.; Chenot, Elise; Christeson, Gail Lynn; Claeys, Philippe; Cockell, Charles S.; Collins, Gareth S.; Coolen, Marco J. L.; Ferrière, Ludovic; Gebhardt, Catalina; Goto, Kazuhisa; Jones, Heather; Kring, David A.; Le Ber, Erwan; Lofi, Johanna; Long, Xiao; Lowery, Christopher; Mellett, Claire; Ocampo-Torres, Rubén; Osinski, Gordon R.; Perez-Cruz, Ligia L.; Pickersgill, Annemarie; Poelchau, Michael H.; Rae, Auriol; Rasmussen, Cornelia; Rebolledo-Vieyra, Mario; Riller, Ulrich; Sato, Honami; Schmitt, Douglas R.; Smit, Jan; Tikoo, Sonia; Tomioka, Naotaka; Urrutia-Fucugauchi, Jaime; Whalen, Michael T.; Wittmann, Axel; Yamaguchi, Kosei E.; Zylberman, William
Author Affiliation(s): Primary:
Imperial College London, Department of Earth Science and Engineering, London, United Kingdom
Other:
University of Texas at Austin, United States
Pennsylvania State University, United States
Université de Bourgogne-Franche Comté, France
Vrije Universiteit Brussel, Belgium
University of Edinburgh, United Kingdom
Curtin University, Australia
Natural History Museum, Austria
Alfred Wegener Institute, Germany
Tohoku University, Japan
Lunar and Planetary Institute, United States
University of Leicester, United Kingdom
Université de Montpellier, France
China University of Geosciences, China
British Geological Survey, United Kingdom
Université de Strasbourg, France
University of Western Ontario, Canada
Universidad Nacional Autónoma de México, Mexico
University of Glasgow, United Kingdom
University of Freiburg, Germany
University of Utah, United States
Unidad de Ciencias del Agua, Mexico
Universität Hamburg, Germany
Japan Agency for Marine-Earth Science and Technology, Japan
University of Alberta, Canada
Vrije Universiteit Amsterdam, Netherlands
Rutgers University New Brunswick, United States
University of Alaska at Fairbanks, United States
Arizona State University, United States
Toho University, Japan
Volume Title: Science
Source: Science, 354(6314), p.878-882. Publisher: American Association for the Advancement of Science, Washington, DC, United States. ISSN: 0036-8075 CODEN: SCIEAS
Note: In English. 42 refs.; illus., incl. sects.
Summary: Large impacts provide a mechanism for resurfacing planets through mixing near-surface rocks with deeper material. Central peaks are formed from the dynamic uplift of rocks during crater formation. As crater size increases, central peaks transition to peak rings. Without samples, debate surrounds the mechanics of peak-ring formation and their depth of origin. Chicxulub is the only known impact structure on Earth with an unequivocal peak ring, but it is buried and only accessible through drilling. Expedition 364 sampled the Chicxulub peak ring, which we found was formed from uplifted, fractured, shocked, felsic basement rocks. The peak-ring rocks are cross-cut by dikes and shear zones and have an unusually low density and seismic velocity. Large impacts therefore generate vertical fluxes and increase porosity in planetary crust.
Year of Publication: 2016
Research Program: IODP2 International Ocean Discovery Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; 23 Surficial Geology, Geomorphology; Atlantic Ocean; Basement; Cenozoic; Chicxulub Crater; Cretaceous; Crust; Expedition 364; Fractures; Gulf of Mexico; Impact craters; Impact features; International Continental Scientific Drilling Program; International Ocean Discovery Program; K-T boundary; Lower Paleocene; Mesozoic; Mexico; North Atlantic; Paleocene; Paleogene; Peak rings; Stratigraphic boundary; Tertiary; Upper Cretaceous; Upper crust; Yucatan Mexico
Record ID: 2017103739
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute.

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