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93 The Meteoritical Society, 2007. Printed in USA. Meteoritics & Planetary Science 42, Nr 1, 93112 (2007)

Summary: 93 © The Meteoritical Society, 2007. Printed in USA.
Meteoritics & Planetary Science 42, Nr 1, 93­112 (2007)
Abstract available online at http://meteoritics.org
Numerical modeling of impact-induced hydrothermal activity
at the Chicxulub crater
Oleg ABRAMOV* and David A. KRING
Lunar and Planetary Laboratory, 1629 East University Boulevard, The University of Arizona, Tucson, Arizona 85721­0092, USA
Present address: Department of Space Studies, Southwest Research Institute, 1050 Walnut Street, Suite 400, Boulder, Colorado 80302, USA
Present address: Lunar and Planetary Institute, 3600 Bay Area Boulevard, Houston, Texas 77058, USA
*Corresponding author. E-mail: abramovo@boulder.swri.edu
(Received 22 February 2006; revision accepted 08 October 2006)
Abstract­Large impact events like the one that formed the Chicxulub crater deliver significant
amounts of heat that subsequently drive hydrothermal activity. We report on numerical modeling of
Chicxulub crater cooling with and without the presence of water. The model inputs are constrained by
data from borehole samples and seismic, magnetic, and gravity surveys. Model results indicate that
initial hydrothermal activity was concentrated beneath the annular trough as well as in the permeable
breccias overlying the melt. As the system evolved, the melt gradually cooled and became permeable,
shifting the bulk of the hydrothermal activity to the center of the crater. The temperatures and fluxes
of fluid and vapor derived from the model are consistent with alteration patterns observed in the
available borehole samples. The lifetime of the hydrothermal system ranges from 1.5 to 2.3 Myr


Source: Abramov, Oleg - Lunar and Planetary Institute


Collections: Geosciences; Physics