Imperial College London
Alternate

ProfessorJoannaMorgan

Faculty of Engineering, Department of Earth Science & Engineering

Emeritus Professor of Geophysics
 
 
 
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Contact

 

+44 (0)20 7594 6423j.v.morgan

 
 
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Location

 

1.46CRoyal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Rae:2019:10.1029/2018JE005821,
author = {Rae, A and Collins, G and Poelchau, M and Riller, U and Davison, T and Grieve, R and Osinski, G and Morgan, J and IODPICDP, Expedition 364 Scientists},
doi = {10.1029/2018JE005821},
journal = {Journal of Geophysical Research: Planets},
pages = {396--417},
title = {Stress-strain evolution during peak-ring formation: a case study of the Chicxulub impact structure},
url = {http://dx.doi.org/10.1029/2018JE005821},
volume = {124},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Deformation is a ubiquitous process that occurs to rocks during impact cratering; thus, quantifying the deformation of those rocks can provide firstorder 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 peakring 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.
AU  - Rae,A
AU  - Collins,G
AU  - Poelchau,M
AU  - Riller,U
AU  - Davison,T
AU  - Grieve,R
AU  - Osinski,G
AU  - Morgan,J
AU  - IODPICDP,Expedition 364 Scientists
DO  - 10.1029/2018JE005821
EP  - 417
PY  - 2019///
SN  - 2169-9097
SP  - 396
TI  - Stress-strain evolution during peak-ring formation: a case study of the Chicxulub impact structure
T2  - Journal of Geophysical Research: Planets
UR  - http://dx.doi.org/10.1029/2018JE005821
UR  - http://hdl.handle.net/10044/1/67113
VL  - 124
ER  -
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