TY - JOUR
T1 - Geologic mapping of the Urvara and Yalode Quadrangles of Ceres
AU - Crown, David A.
AU - Sizemore, Hanna G.
AU - Yingst, R. Aileen
AU - Mest, Scott C.
AU - Platz, Thomas
AU - Berman, Daniel C.
AU - Schmedemann, Nico
AU - Buczkowski, Debra L.
AU - Williams, David
AU - Roatsch, Thomas
AU - Preusker, Frank
AU - Raymond, Carol A.
AU - Russell, Christopher T.
N1 - Funding Information:
This research has been enabled by the many individuals involved in the successful operations of the Dawn Mission at Ceres, including the NASA Dawn Science and Flights teams at the Jet Propulsion Laboratory and the instrument teams at the Max Planck Institute for Solar System Research, the German Aerospace Center (DLR), the Italian National Institute for Astrophysics (INAF), and the Planetary Science Institute (PSI). We thank two anonymous reviewers for their comments that improved the presentation of this research. We acknowledge support from the NASA Dawn at Ceres Guest Investigator Program ( NNX15AI36G ). We thank Andrea Nass (DLR) for creating the template for quadrangle mapping of Ceres and importing the Urvara and Yalode maps into it and Adrian Neesemann for providing his crater catalogue (May 31, 2016 version) to facilitate our derivation of age estimates for geologic units.
Funding Information:
This research has been enabled by the many individuals involved in the successful operations of the Dawn Mission at Ceres, including the NASA Dawn Science and Flights teams at the Jet Propulsion Laboratory and the instrument teams at the Max Planck Institute for Solar System Research, the German Aerospace Center (DLR), the Italian National Institute for Astrophysics (INAF), and the Planetary Science Institute (PSI). We thank two anonymous reviewers for their comments that improved the presentation of this research. We acknowledge support from the NASA Dawn at Ceres Guest Investigator Program (NNX15AI36G). We thank Andrea Nass (DLR) for creating the template for quadrangle mapping of Ceres and importing the Urvara and Yalode maps into it and Adrian Neesemann for providing his crater catalogue (May 31, 2016 version) to facilitate our derivation of age estimates for geologic units.
Publisher Copyright:
© 2017 The Authors
PY - 2018/12
Y1 - 2018/12
N2 - We conducted geologic mapping of the Urvara (Ac-13) and Yalode (Ac-14) Quadrangles (21–66°S, 180–360°E) of the dwarf planet Ceres utilizing morphologic, topographic, and compositional information acquired by NASA's Dawn mission. The geologic characteristics of the two large impact basins Urvara (170 km diameter) and Yalode (260 km diameter) and their surroundings were investigated using Dawn Framing Camera datasets, including Survey (415 m/pixel), HAMO (140 m/pixel), and LAMO (35 m/pixel) images and mosaics, color and color ratio images, and DTMs derived from stereo-photogrammetry. Geologic mapping demonstrates that impact cratering has dominated the geologic history of the Urvara and Yalode Quadrangles, with early cratered terrain formation followed by formation of the large basins and widespread emplacement of basin-related smooth material. Impact craters display a wide range of preservation states from nearly completely buried/degraded forms to more recent pristine craters with terraced inner walls and lobate ejecta deposits. Cross-cutting relationships and morphologic signatures show that the Urvara impact followed the Yalode impact, consistent with ages derived from crater size-frequency distributions (580 ± 40 Ma for Yalode and 550 ± 50 Ma for Urvara). Observed differences in basin materials and rim morphology suggest heterogeneities in the substrate excavated by impact. Smooth deposits that cover large areas of the quadrangles, including the basin floors, rims, and exterior zones, are interpreted to be dominated by Urvara ejecta but Yalode ejecta and localized ice-rich flow material may be minor components. Geologic mapping results and simulations of ejecta emplacement suggest that Urvara and Yalode ejecta deposits extend for large distances (more than two crater diameters from the basin centers) and may serve as important stratigraphic markers for the geologic record of Ceres.
AB - We conducted geologic mapping of the Urvara (Ac-13) and Yalode (Ac-14) Quadrangles (21–66°S, 180–360°E) of the dwarf planet Ceres utilizing morphologic, topographic, and compositional information acquired by NASA's Dawn mission. The geologic characteristics of the two large impact basins Urvara (170 km diameter) and Yalode (260 km diameter) and their surroundings were investigated using Dawn Framing Camera datasets, including Survey (415 m/pixel), HAMO (140 m/pixel), and LAMO (35 m/pixel) images and mosaics, color and color ratio images, and DTMs derived from stereo-photogrammetry. Geologic mapping demonstrates that impact cratering has dominated the geologic history of the Urvara and Yalode Quadrangles, with early cratered terrain formation followed by formation of the large basins and widespread emplacement of basin-related smooth material. Impact craters display a wide range of preservation states from nearly completely buried/degraded forms to more recent pristine craters with terraced inner walls and lobate ejecta deposits. Cross-cutting relationships and morphologic signatures show that the Urvara impact followed the Yalode impact, consistent with ages derived from crater size-frequency distributions (580 ± 40 Ma for Yalode and 550 ± 50 Ma for Urvara). Observed differences in basin materials and rim morphology suggest heterogeneities in the substrate excavated by impact. Smooth deposits that cover large areas of the quadrangles, including the basin floors, rims, and exterior zones, are interpreted to be dominated by Urvara ejecta but Yalode ejecta and localized ice-rich flow material may be minor components. Geologic mapping results and simulations of ejecta emplacement suggest that Urvara and Yalode ejecta deposits extend for large distances (more than two crater diameters from the basin centers) and may serve as important stratigraphic markers for the geologic record of Ceres.
UR - http://www.scopus.com/inward/record.url?scp=85028299321&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85028299321&partnerID=8YFLogxK
U2 - 10.1016/j.icarus.2017.08.004
DO - 10.1016/j.icarus.2017.08.004
M3 - Article
AN - SCOPUS:85028299321
SN - 0019-1035
VL - 316
SP - 167
EP - 190
JO - Icarus
JF - Icarus
ER -