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Degradation of Homestead Hollow at the InSight Landing Site Based on the Distribution and Properties of Local Deposits

Grant, J.A. and Warner, N. and Weitz, C.M. and Golombek, M. and Wilson, S. and Baker, M. and Hauber, Ernst and Ansan, V. and Charalambous, C. and Williams, N. and Calef, Fred and Pike, T. and DeMott, A. and Kopp, M. and Lethcoe-Wilson, H. and Banks, M. (2020) Degradation of Homestead Hollow at the InSight Landing Site Based on the Distribution and Properties of Local Deposits. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 125 (4), e2019JE006350. Wiley. doi: 10.1029/2019JE006350. ISSN 2169-9097.

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019JE006350

Abstract

The InSight mission landed its scientific payload in Homestead hollow, a quasi‐circular depression interpreted to be a highly degraded impact crater that is 27 m in diameter. The original pristine crater formed in a preexisting impact‐generated regolith averaging ~3 m thick and the surrounding ejecta deposit, consisting of coarse and mostly fine fragments, was in disequilibrium with local geomorphic thresholds. As a result, early, relatively rapid degradation by mostly eolian, and lesser impact processes and mass‐wasting, stripped the rim and mostly infilled the hollow where sediments were sequestered. Early, faster degradation during the first ~0.1 Ga was followed by much slower degradation over the bulk of the 0.4–0.7 Ga history of the crater. Pulses of much lesser degradation are attributed to impacts in and nearby the hollow, which emplaced some rocks as ejecta and provided small inventories of fine sediments for limited additional infilling. Even lesser sediments were derived from the very slow production of fines via weathering of resistant basaltic rocks. Nevertheless, indurated regolith caps the sediment fill within the hollow and creates a relatively stable present‐day surface that further sequesters infilling sediments from remobilization. The degradation sequence at Homestead hollow is like that established at the Spirit rover landing site in Gusev crater and points to the importance of eolian, and lesser impact and mass‐wasting processes, in degrading volcanic surfaces on Mars over the past ~1 Ga.

Item URL in elib:https://elib.dlr.de/139602/
Document Type:Article
Title:Degradation of Homestead Hollow at the InSight Landing Site Based on the Distribution and Properties of Local Deposits
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Grant, J.A.Smithsonian Institute, Washington, USAUNSPECIFIED
Warner, N.SUNY at GeneseoUNSPECIFIED
Weitz, C.M.Planetary ScienceUNSPECIFIED
Golombek, M.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAhttps://orcid.org/0000-0002-1928-2293
Wilson, S.Smithsonian Institute, Washington, USAUNSPECIFIED
Baker, M.Smithsonian Institute, Washington, DC, USAUNSPECIFIED
Hauber, ErnstErnst.Hauber (at) dlr.dehttps://orcid.org/0000-0002-1375-304X
Ansan, V.Laboratoire Planétologie et Géodynamique de Nantes, LPGN/CNRS, Université NantesUNSPECIFIED
Charalambous, C.Department of Electrical and Electronic Engineering, Imperial College, South Kensington Campus, London, UKUNSPECIFIED
Williams, N.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIED
Calef, FredJet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIED
Pike, T.Imperial College of London, London, UKUNSPECIFIED
DeMott, A.SUNY at GeneseoUNSPECIFIED
Kopp, M.SUNY at GeneseoUNSPECIFIED
Lethcoe-Wilson, H.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIED
Banks, M.NASA Goddard Space Flight Center, Greenbelt, MDUNSPECIFIED
Date:April 2020
Journal or Publication Title:JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:125
DOI :10.1029/2019JE006350
Page Range:e2019JE006350
Publisher:Wiley
ISSN:2169-9097
Status:Published
Keywords:Mars, degradation, InSight, eolian, impact
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
Deposited By: Hauber, Ernst
Deposited On:14 Dec 2020 10:50
Last Modified:14 Dec 2020 10:50

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