Stress‐strain evolution during peak‐ring formation: a case study of the Chicxulub impact structure

Rae, A. S.P., Collins, G. S., Poelchau, M., Riller, U., Davison, T. M., Grieve, R. A.F., Osinski, G. R., Morgan, J. V. and IODP‐ICDP Expedition 364 Scientists, (2019) Stress‐strain evolution during peak‐ring formation: a case study of the Chicxulub impact structure. Journal of Geophysical Research: Planets, 124(2), pp. 396-417. (doi:10.1029/2018JE005821)

[img]
Preview
Text
192907.pdf - Published Version

3MB

Abstract

Deformation is a ubiquitous process that occurs to rocks during impact cratering; thus, quantifying the deformation of those rocks can provide first‐order constraints on the process of impact cratering. Until now, specific quantification of the conditions of stress and strain within models of impact cratering has not been compared to structural observations. This paper describes a methodology to analyze stress and strain within numerical impact models. This method is then used to predict deformation and its cause during peak‐ring formation: a complex process that is not fully understood, requiring remarkable transient weakening and causing a significant redistribution of crustal rocks. The presented results are timely due to the recent Joint International Ocean Discovery Program and International Continental Scientific Drilling Program drilling of the peak ring within the Chicxulub crater, permitting direct comparison between the deformation history within numerical models and the structural history of rocks from a peak ring. The modeled results are remarkably consistent with observed deformation within the Chicxulub peak ring, constraining the following: (1) the orientation of rocks relative to their preimpact orientation; (2) total strain, strain rates, and the type of shear during each stage of cratering; and (3) the orientation and magnitude of principal stresses during each stage of cratering. The methodology and analysis used to generate these predictions is general and, therefore, allows numerical impact models to be constrained by structural observations of impact craters and for those models to produce quantitative predictions.

Item Type:Articles
Additional Information:The work presented here was funded by STFC (ST/N000803/1) and NERC (NE/P011195/1).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Pickersgill, Dr Annemarie
Authors: Rae, A. S.P., Collins, G. S., Poelchau, M., Riller, U., Davison, T. M., Grieve, R. A.F., Osinski, G. R., Morgan, J. V., and IODP‐ICDP Expedition 364 Scientists,
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
Journal Name:Journal of Geophysical Research: Planets
Publisher:Wiley
ISSN:2169-9097
ISSN (Online):2169-9100
Published Online:31 January 2019
Copyright Holders:Copyright © 2019 American Geophysical Union
First Published:First published in Journal of Geophysical Research: Planets 124(2):396-417
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

University Staff: Request a correction | Enlighten Editors: Update this record