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Regional Structural Orientation of the Mount Sharp Group Revealed by In Situ Dip Measurements and Stratigraphic Correlations on the Vera Rubin Ridge

Stein, Nathaniel T. and Quinn, Daven P. and Grotzinger, John P. and Fedo, Christopher and Ehlmann, Bethany L. and Stack, Kathryn M. and Edgar, Lauren A. and Fraeman, Abigail A. and Deen, Robert (2020) Regional Structural Orientation of the Mount Sharp Group Revealed by In Situ Dip Measurements and Stratigraphic Correlations on the Vera Rubin Ridge. Journal of Geophysical Research. Planets, 125 (5). Art. No. e2019JE006298. ISSN 2169-9097.

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Ground‐based bedding orientation measurements are critical to determine the geologic history and processes of sedimentation in Gale crater, Mars. We constrain the dip of lacustrine strata of the Blunts Point, Pettegrove Point, and Jura members of the Murray formation using a combination of regional stratigraphic correlations and bed attitude measurements from stereo Mastcam images taken by the Mars Science Laboratory Curiosity rover. In situ bed attitude measurements using a principal component analysis‐based regression method reveal a wide range of dips and dip azimuths owing to a combination of high stereo errors, postdepositional deformation of strata (e.g., fracturing, rotation, and impact cratering), and different primary depositional dips. These constrain regional dips to be within several degrees of horizontal on average. Stratigraphic correlations between targets observed in the Glen Torridon trough and at the Pettegrove Point‐Jura member contact of Vera Rubin ridge (VRR) constrain dips to be between 3°SE and 2°NW, consistent with nearly flat strata deposited horizontally on an equipotential surface. The Jura member is determined to be stratigraphically equivalent to the northern portion of the Glen Torridon trough. Rover‐based dip magnitudes are generally significantly shallower than the orientation of VRR member contacts measured from High Resolution Imaging Science Experiment‐based traces, suggesting the sedimentary strata and VRR member contacts may be discordant.

Item Type:Article
Related URLs:
URLURL TypeDescription
Stein, Nathaniel T.0000-0003-3385-9957
Quinn, Daven P.0000-0003-1895-3742
Grotzinger, John P.0000-0001-9324-1257
Fedo, Christopher0000-0002-2626-1132
Ehlmann, Bethany L.0000-0002-2745-3240
Stack, Kathryn M.0000-0003-3444-6695
Edgar, Lauren A.0000-0001-7512-7813
Fraeman, Abigail A.0000-0003-4017-5158
Deen, Robert0000-0002-5693-641X
Alternate Title:Regional structural orientation of the Mt. Sharp group revealed by in-situ dip measurements and stratigraphic correlations on the Vera Rubin ridge
Additional Information:© 2020. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. Received 2 DEC 2019; Accepted 25 MAR 2020; Accepted article online 13 APR 2020. Mastcam images presented in this paper are archived in the Planetary Data System ( Archives of all Mastcam stereo products will be available via the NASA Planetary Data System (PDS) through the Mastcam Stereo Analysis and Mosaics (MSAM) project (Deen et al., 2019). All derived bed trace products are archived at CaltechDATA (doi:10.22002/D1.1318). The software used to fit bedding planes is archived at CaltechDATA (Attitude, doi:10.22002/D1.1211, We are grateful to the Mars Science Laboratory Project engineering and science teams, as well as MSL team members who participated in tactical and strategic operations, for their diligent efforts required to collect the data presented here. Thanks to the MSL sed‐strat working group, Kevin Lewis, Maddie Turner, and Edwin Kite for their input that improved the material presented in this manuscript. We also thank David Rubin and an anonymous reviewer for their input. B. L. E. acknowledges support from the MSL Participating Scientist Program. A portion of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
Group:Astronomy Department
Funding AgencyGrant Number
Issue or Number:5
Record Number:CaltechAUTHORS:20200413-121809795
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Official Citation:Stein, N. T., Quinn, D. P., Grotzinger, J. P., Fedo, C., Ehlmann, B. L., Stack, K. M., et al. (2020). Regional structural orientation of the Mount Sharp group revealed by in situ dip measurements and stratigraphic correlations on the Vera Rubin ridge. Journal of Geophysical Research: Planets, 125, e2019JE006298.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102506
Deposited By: Tony Diaz
Deposited On:13 Apr 2020 19:37
Last Modified:23 Dec 2020 18:54

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