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In Situ and Orbital Stratigraphic Characterization of the InSight Landing Site - A Type Example of a Regolith-Covered Lava Plain on Mars

Warner, N. and Golombek, M.P. and Ansan, V. and Marteau, E. and Williams, N. and Grant, J.A. and Hauber, E. and Weitz, C. and Wilson, S. and Piqueux, S. and Mueller, N. and Grott, M. and Spohn, T. and Pan, L. and Schmelzbach, C. and Daubar, I. and Garvin, J. and Charalambous, C. and Baker, M. and Banks, M. (2022) In Situ and Orbital Stratigraphic Characterization of the InSight Landing Site - A Type Example of a Regolith-Covered Lava Plain on Mars. Journal of Geophysical Research: Planets, 127 (4). Wiley. doi: 10.1029/2022JE007232. ISSN 2169-9097.

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022JE007232


The InSight lander rests on a regolith-covered, Hesperian to Early Amazonian lava plain in Elysium Planitia within a ∼27-m-diameter, degraded impact crater called Homestead hollow. The km to cm-scale stratigraphy beneath the lander is relevant to the mission's geophysical investigations. Geologic mapping and crater statistics indicate that ∼170 m of mostly Hesperian to Early Amazonian basaltic lavas are underlain by Noachian to Early Hesperian (∼3.6 Ga) materials of possible sedimentary origin. Up to ∼140 m of this volcanic resurfacing occurred in the Early Amazonian at 1.7 Ga, accounting for removal of craters ≤700 m in diameter. Seismic data however, suggest a clastic horizon that interrupts the volcanic sequence between depths of ∼30 and ∼75 m. Meter-scale stratigraphy beneath the lander is constrained by local and regional regolith thickness estimates that indicate up to 10–30 m of coarse-grained, brecciated regolith that fines upwards to a ∼3 m thick loosely-consolidated, sand-dominated unit. The maximum depth of Homestead hollow, at ∼3 m, indicates that the crater is entirely embedded in regolith. The hollow is filled by sand-size eolian sediments, with contributions from sand to cobble-size slope debris, and sand to cobble-size ejecta. Lander-based observations indicate that the fill at Homestead hollow contains a cohesive layer down to ∼10–20 cm depth that is visible in lander rocket-excavated pits and the HP3 mole hole. The surface of the landing site is capped by a ∼1 to 2 cm-thick loosely granular, sand-sized layer with a microns-thick surficial dust horizon.

Item URL in elib:https://elib.dlr.de/188167/
Document Type:Article
Title:In Situ and Orbital Stratigraphic Characterization of the InSight Landing Site - A Type Example of a Regolith-Covered Lava Plain on Mars
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Golombek, M.P.Jet Propulsion Laboratory, Pasadena, California, USAUNSPECIFIEDUNSPECIFIED
Ansan, V.Laboratoire Planétologie et Géodynamique de Nantes, LPGN/CNRS, Université NantesUNSPECIFIEDUNSPECIFIED
Marteau, E.Jet Propulsion Laboratory, Pasadena, CA, USAUNSPECIFIEDUNSPECIFIED
Williams, N.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIEDUNSPECIFIED
Grant, J.A.Smithsonian Institute, Washington, USAUNSPECIFIEDUNSPECIFIED
Hauber, E.UNSPECIFIEDhttps://orcid.org/0000-0002-1375-304XUNSPECIFIED
Wilson, S.Smithsonian National Air and Space Museum, Center for Earth and Planetary StudiesUNSPECIFIEDUNSPECIFIED
Piqueux, S.Jet Propulsion Laboratory, California Institute of Technology (Pasadena, CA, 91109)UNSPECIFIEDUNSPECIFIED
Mueller, N.UNSPECIFIEDhttps://orcid.org/0000-0001-9229-8921UNSPECIFIED
Grott, M.UNSPECIFIEDhttps://orcid.org/0000-0002-8613-7096UNSPECIFIED
Spohn, T.UNSPECIFIEDhttps://orcid.org/0000-0002-9322-6660UNSPECIFIED
Pan, L.Center for Star and Planet Formation, GLOBE Institute, University of Copenhagen, Copenhagen, DenmarkUNSPECIFIEDUNSPECIFIED
Schmelzbach, C.ETH Swiss Federal Institute of Technology, Zurich, SwitzerlandUNSPECIFIEDUNSPECIFIED
Daubar, I.Brown University, Providence, RI, USAUNSPECIFIEDUNSPECIFIED
Garvin, J.NASA Goddard Space Flight Center, Greenbelt, MD, United StatesUNSPECIFIEDUNSPECIFIED
Charalambous, C.Department of Electrical and Electronic Engineering, Imperial College, South Kensington Campus, London, UKUNSPECIFIEDUNSPECIFIED
Baker, M.Smithsonian Institute, Washington, DC, USAUNSPECIFIEDUNSPECIFIED
Banks, M.NASA Goddard Space Flight Center, Greenbelt, MDUNSPECIFIEDUNSPECIFIED
Date:April 2022
Journal or Publication Title:Journal of Geophysical Research: Planets
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Mars, Geologie
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project InSight - HP3
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Institute of Planetary Research > Planetary Physics
Institute of Planetary Research > Planetary Sensor Systems
Deposited By: Müller, Nils
Deposited On:18 Nov 2022 10:58
Last Modified:28 Feb 2023 14:57

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