The formation of peak rings in large impact craters

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Title: The formation of peak rings in large impact craters
Author(s): Morgan, JV
Item Type: Journal Article
Abstract: Large impacts provide a mechanism for resurfacin g 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 peak s transition to peak ri ngs. 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. Ex pedition 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.
Publication Date: 18-Nov-2016
Date of Acceptance: 14-Oct-2016
URI: http://hdl.handle.net/10044/1/42572
DOI: https://dx.doi.org/10.1126/science.aah6561
ISSN: 0036-8075
Publisher: American Association for the Advancement of Science (A A A S)
Start Page: 878
End Page: 882
Journal / Book Title: Science
Volume: 354
Issue: 6314
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST/N000803/1
Keywords: General Science & Technology
MD Multidisciplinary
Publication Status: Published
Appears in Collections:Faculty of Engineering
Earth Science and Engineering



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