Detection of new olivine-rich locations on Vesta

“…; Palomba et al. ) or mixtures of low‐ and high‐Ca pyroxene (Combe et al. ), abuts a region of higher topography to its north, which may be the source of more coherent material exposed in its crater walls.…”

Section: Observations Of Crater Wallsmentioning

confidence: 99%

Global variations in regolith properties on asteroid Vesta from Dawn's low‐altitude mapping orbit

Denevi

Beck

Coman

et al. 2016

Meteorit & Planetary Scien

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We investigate the depth, variability, and history of regolith on asteroid Vesta using data from the Dawn spacecraft. High‐resolution (15–20 m pixel−1) Framing Camera images are used to assess the presence of morphologic indicators of a shallow regolith, including the presence of blocks in crater ejecta, spur‐and‐gully–type features in crater walls, and the retention of small (<300 m) impact craters. Such features reveal that the broad, regional heterogeneities observed on Vesta in terms of albedo and surface composition extend to the physical properties of the upper ~1 km of the surface. Regions of thin regolith are found within the Rheasilvia basin and at equatorial latitudes from ~0–90°E and ~260–360°E. Craters in these areas that appear to excavate material from beneath the regolith have more diogenitic (Rheasilvia, 0–90°E) and cumulate eucrite (260–360°E) compositions. A region of especially thick regolith, where depths generally exceed 1 km, is found from ~100–240°E and corresponds to heavily cratered, low‐albedo surface with a basaltic eucrite composition enriched in carbonaceous chondrite material. The presence of a thick regolith in this area supports the idea that this is an ancient terrain that has accumulated a larger component of exogenic debris. We find evidence for the gardening of crater ejecta toward more howarditic compositions, consistent with regolith mixing being the dominant form of “weathering” on Vesta.

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“…; Palomba et al. ) may represent either endogenous material originating from the Vestan mantle (Lunning et al. ), or exogenous material from surviving silicate fragments of asteroid collisions with the Vestan surface (e.g., Turrini et al.…”

Section: Discussionmentioning

confidence: 99%

Geochemistry and petrology of howardite Miller Range 11100: A lithologically diverse piece of the Vestan regolith

Gregory

Joy

Strekopytov

et al. 2016

Meteorit & Planetary Scien

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms it is akin to the fragmental howardite meteorites. The strong lithological heterogeneity across this 29 sample suggests that at least some parts of the Vestan regolith show heterogeneity on the mm-scale. 30We combine the outcomes of this study with data from NASA's Dawn mission and hypothesize on 31 possible source regions for this meteorite on the surface of Vesta. 32 33

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Detection of new olivine-rich locations on Vesta

Cited by 39 publications

References 48 publications

Compositional differences among Bright Spots on the Ceres surface

Compositional differences among Bright Spots on the Ceres surface

Global variations in regolith properties on asteroid Vesta from Dawn's low‐altitude mapping orbit

Geochemistry and petrology of howardite Miller Range 11100: A lithologically diverse piece of the Vestan regolith

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