Relative age of interior layered deposits in southwest Candor Chasma based on high-resolution structural mapping

Chris H. Okubo, Kevin W. Lewis, Alfred S. McEwen, Randolph L. Kirk

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

High-resolution topography generated from stereo HiRISE (High-Resolution Imaging Science Experiment) imagery reveals the meter-scale structure of interior layered deposits (ILD) in southwest Candor Chasma. This study seeks to determine the age of the local ILD relative to any normal faults that can be attributed to chasma formation. The study area is located near the contact of these ILD and the wall rock and is in an area where chasma-forming normal faults have been proposed. We find that while normal faults are found in the study area, these faults are not sufficiently large nor appropriately located or oriented to accommodate the roughly northeast-southwest extension that is required for normal faults that can be attributed to chasma formation. Additionally, bedding exposed in the local ILD generally dips toward the center of Candor Chasma, consistent with sediment deposition in a preexisting basin. Further, pit craters of Tithonia Catena, presumed to predate or be contemporaneous with the formation of west Candor Chasma, do not cut into the ILD within the study area. These independent lines of evidence support a postchasma age for the ILD exposed within the study area. Chasma-related normal faults may exist within these ILD at depth but are not exposed at the surface. Approximately 2 km of conformable stratigraphy is exposed in the study area, and therefore at least several kilometers of the local ILD were deposited subsequent to any chasma-related normal faulting that may have occurred in this part of Candor Chasma.

Original languageEnglish (US)
Article numberE12002
JournalJournal of Geophysical Research: Space Physics
Volume113
Issue number12
DOIs
StatePublished - Dec 20 2008

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normal fault
Deposits
deposits
high resolution
catena
wall rock
crater
Wall rock
faulting
stratigraphy
imagery
Faulting
Stratigraphy
topography
Prednisolone
craters
Topography
Sediments
sediments
basin

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Relative age of interior layered deposits in southwest Candor Chasma based on high-resolution structural mapping. / Okubo, Chris H.; Lewis, Kevin W.; McEwen, Alfred S.; Kirk, Randolph L.

In: Journal of Geophysical Research: Space Physics, Vol. 113, No. 12, E12002, 20.12.2008.

Research output: Contribution to journalArticle

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