Peak-ring formation in large impact craters: geophysical constraints from Chicxulub

In the citing paper

“Based on the above reasoning, the gravity expression of the entire structural uplift at Chicxulub actually has a diameter of 70-80 km, which is more consistent with that derived from the seismic interpretation (Morgan et al. 2000;Vermeesch and Morgan 2004;Vermeesch 2006).”

In the citing paper

“It is coincident at its outer margin with an inward dipping, low-velocity-zone (LVZ) in the seismic data (Fig. 11), where the overall P-wave velocity contrast with the surrounding rocks is 100-500 m s -1 , between the depths of 1 and 7 km (Morgan et al. 2000).”

In the citing paper

“The interpretation of the reflection seismic data (Morgan et al. 2000) and the interpretation that the seismic and gravity data at Chicxulub can be reconciled to indicate that the structural uplift in the crater floor extends out to the inner topographic ring are generally consistent with this type of model (Vermeesch and Morgan 2008).”

In the citing paper

“This ~90 km diameter zone is coincident with the location of the inward dipping reflector (Fig. 11), which may represent the boundary between relatively intact slumped blocks of Cretaceous and highly fractured peak-ring material (Morgan et al. 2000;Vermeesch 2006).”

In the citing paper

“Inward of the dipping reflectors is the low-velocity zone with a similar inward dip (Morgan et al. 2000), which is interpreted to be due to a megabreccia or fractured basement of the structural uplift (Vermeesch and Morgan 2004).”