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Geologic mapping of ejecta deposits in Oppia Quadrangle, Asteroid (4) Vesta

Garry, W.B. and Williams, D.A. and Yingst, R. Aileen and Mest, S. and Buczkowski, D.L. and Tosi, F. and Schäfer, M. and Le Corre, L. and Reddy, V. and Jaumann, R. and Pieters, C.M. and Russell, Christopher T. and Raymond, C.A. (2014) Geologic mapping of ejecta deposits in Oppia Quadrangle, Asteroid (4) Vesta. Icarus, 244, 104 - 119. Elsevier. DOI: 10.1016/j.icarus.2014.08.046 ISSN 0019-1035

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Official URL: http://www.sciencedirect.com/science/article/pii/S0019103514004965

Abstract

Abstract Oppia Quadrangle Av-10 (288–360°E, ±22°) is a junction of key geologic features that preserve a rough history of Asteroid (4) Vesta and serves as a case study of using geologic mapping to define a relative geologic timescale. Clear filter images, stereo-derived topography, slope maps, and multispectral color-ratio images from the Framing Camera on NASA’s Dawn spacecraft served as basemaps to create a geologic map and investigate the spatial and temporal relationships of the local stratigraphy. Geologic mapping reveals the oldest map unit within Av-10 is the cratered highlands terrain which possibly represents original crustal material on Vesta that was then excavated by one or more impacts to form the basin Feralia Planitia. Saturnalia Fossae and Divalia Fossae ridge and trough terrains intersect the wall of Feralia Planitia indicating that this impact basin is older than both the Veneneia and Rheasilvia impact structures, representing Pre-Veneneian crustal material. Two of the youngest geologic features in Av-10 are Lepida (∼45 km diameter) and Oppia (∼40 km diameter) impact craters that formed on the northern and southern wall of Feralia Planitia and each cross-cuts a trough terrain. The ejecta blanket of Oppia is mapped as ‘dark mantle’ material because it appears dark orange in the Framing Camera ‘Clementine-type’ color-ratio image and has a diffuse, gradational contact distributed to the south across the rim of Rheasilvia. Mapping of surface material that appears light orange in color in the Framing Camera ‘Clementine-type’ color-ratio image as ‘light mantle material’ supports previous interpretations of an impact ejecta origin. Some light mantle deposits are easily traced to nearby source craters, but other deposits may represent distal ejecta deposits (emplaced >5 crater radii away) in a microgravity environment.

Item URL in elib:https://elib.dlr.de/93898/
Document Type:Article
Additional Information:Special Issue: The Geology of Vesta
Title:Geologic mapping of ejecta deposits in Oppia Quadrangle, Asteroid (4) Vesta
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Garry, W.B.Planetary Science Institute, Tucson, AZ, USAUNSPECIFIED
Williams, D.A.Arizona State UniversityUNSPECIFIED
Yingst, R. AileenPlanetary Science Institute, Tucson, AZ, United States.UNSPECIFIED
Mest, S.Planetary Science Institute, 1700 E. Ft. Lowell, Suite 106, Tucson, AZ, 85719, USAUNSPECIFIED
Buczkowski, D.L.Johns Hopkins University Applied Physics Laboratory 11100 Johns Hopkins Rd. Laurel, MD 20723-6099, USAUNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIED
Schäfer, M.Max-Planck-Institute for Solar System ResearchUNSPECIFIED
Le Corre, L.Max Planck Institute for Solar System Research, Max-Planck-Str. 2, Katlenburg-Lindau, 37191, GermanyUNSPECIFIED
Reddy, V.Department of Space Studies, University of North Dakota, Grand Forks, ND 58202, USAUNSPECIFIED
Jaumann, R.ralf.jaumann (at) dlr.deUNSPECIFIED
Pieters, C.M.Brown University, Providence, RI, USAUNSPECIFIED
Russell, Christopher T.UCLA, Los Angeles, CA, United States.UNSPECIFIED
Raymond, C.A.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099, USAUNSPECIFIED
Date:2014
Journal or Publication Title:Icarus
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:244
DOI :10.1016/j.icarus.2014.08.046
Page Range:104 - 119
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:Asteroid Vesta; Asteroids, surfaces; Geological processes; Cratering
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt DAWN
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Krohn, Dr.rer.nat Katrin
Deposited On:18 Dec 2014 13:24
Last Modified:10 Jan 2019 15:54

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