In this section
@article{Gulick:2013:10.1002/rog.20007,
author = {Gulick, S and Christeson, G and Barton, P and Grieve, R and Morgan, J and Urrutia, J},
doi = {10.1002/rog.20007},
journal = {Reviews of Geophysics},
title = {Geophysical Characterization of the Chicxulub Impact Crater},
url = {http://dx.doi.org/10.1002/rog.20007},
year = {2013}
}
TY - JOUR
AB - Geophysical data indicate that the 65.5 Ma Chicxulub impact structure is a multi-ring basin, with three sets of semi-continuous, arcuate ring faults and a topographic peak ring. Slump blocks define a terrace zone, which steps down from the inner rim into the annular trough. Fault blocks underlie the peak ring, which exhibits variable relief, due to target asymmetries. The central structural uplift is >10 km and the Moho is displaced by 1-2 km. The working hypothesis for the formation of Chicxulub is: a 50 km radius transient cavity, lined with melt and impact breccia, formed within 10s of seconds of the impact and within minutes, weakened rebounding crust rose kilometers above the surface, the transient crater rim underwent localized deformation and collapsed into large slump blocks, resulting in a inner rim at 70-85 km radius, and outer ring faults at 70-130 km radius. The over-heightened structural uplift collapsed outwards, buried the inner slump blocks, and formed the peak ring. Most of the impact melt was ultimately emplaced as a coherent <3-km thick melt sheet within the central basin that shallows within the inner regions of the peak ring. Smaller pockets of melt flowed into the annular trough. Subsequently, slope collapse, ejecta, ground surge, and tsunami waves infilled the annular trough and annular basin with sediments up to 3 km and 900 m thick, respectively. Testing this working hypothesis requires direct observation of the impactites, within and adjacent to the peak ring and central basin.
AU - Gulick,S
AU - Christeson,G
AU - Barton,P
AU - Grieve,R
AU - Morgan,J
AU - Urrutia,J
DO - 10.1002/rog.20007
PY - 2013///
TI - Geophysical Characterization of the Chicxulub Impact Crater
T2 - Reviews of Geophysics
UR - http://dx.doi.org/10.1002/rog.20007
UR - http://onlinelibrary.wiley.com/doi/10.1002/rog.20007/abstract
ER -