Evidence for the Interior Evolution of Ceres from Geologic Analysis of Fractures
Journal
Date Issued
2017
Author(s)
Scully, J. E. C.
•
Buczkowski, D. L.
•
Schmedemann, N.
•
Raymond, C. A.
•
Castillo‐Rogez, J. C.
•
King, S. D.
•
Bland, M. T.
•
Ermakov, A. I.
•
O'Brien, D. P.
•
Marchi, S.
•
•
Russell, C. T.
•
Fu, R. R.
•
Neveu, M.
Abstract
Ceres is the largest asteroid belt object, and the Dawn spacecraft observed Ceres since 2015.
Dawn observed two morphologically distinct linear features on Ceres’s surface: secondary crater chains
and pit chains. Pit chains provide unique insights into Ceres’s interior evolution. We interpret pit chains called
the Samhain Catenae as the surface expression of subsurface fractures. Using the pit chains’ spacings, we
estimate that the localized thickness of Ceres’s fractured, outer layer is approximately ≥58 km, at least ~14 km
greater than the global average. We hypothesize that extensional stresses, induced by a region of upwelling
material arising from convection/diapirism, formed the Samhain Catenae. We derive characteristics for this
upwelling material, which can be used as constraints in future interior modeling studies. For example, its
predicted location coincides with Hanami Planum, a high-elevation region with a negative residual gravity
anomaly, which may be surficial evidence for this proposed region of upwelling material.
Volume
44
Issue
19
Start page
9564
Issn Identifier
0094-8276
Rights
open.access
File(s)![Thumbnail Image]()
![Thumbnail Image]()
Loading...
Name
2017GL075086_Merged_PDF_compressed.pdf
Description
preprint
Size
591.46 KB
Format
Adobe PDF
Checksum (MD5)
2ac162eb608ed92c835ae70e88be542b
Loading...
Name
GRL2017GL075086-compr.pdf
Description
Pdf editoriale
Size
734.06 KB
Format
Adobe PDF
Checksum (MD5)
9bf74b83edf01e8424b69b9f0334dff1