| Literature DB >> 27856906 |
Joanna V Morgan1, Sean P S Gulick2, Timothy Bralower3, Elise Chenot4, Gail Christeson2, Philippe Claeys5, Charles Cockell6, Gareth S Collins7, Marco J L Coolen8, Ludovic Ferrière9, Catalina Gebhardt10, Kazuhisa Goto11, Heather Jones3, David A Kring12, Erwan Le Ber13, Johanna Lofi14, Xiao Long15, Christopher Lowery2, Claire Mellett16, Rubén Ocampo-Torres17, Gordon R Osinski18,19, Ligia Perez-Cruz20, Annemarie Pickersgill21, Michael Poelchau22, Auriol Rae7, Cornelia Rasmussen23, Mario Rebolledo-Vieyra24, Ulrich Riller25, Honami Sato26, Douglas R Schmitt27, Jan Smit28, Sonia Tikoo29, Naotaka Tomioka30, Jaime Urrutia-Fucugauchi20, Michael Whalen31, Axel Wittmann32, Kosei E Yamaguchi33,34, William Zylberman18,35.
Abstract
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.Entities:
Year: 2016 PMID： 27856906 DOI： 10.1126/science.aah6561
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728