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Date |
2015-03-15 |
| 42250 |
Is Part Of |
p00191035 |
| 42250 |
Is Part Of |
repository |
| 42250 |
abstract |
Impact processes at all scales have been involved in the formation and subsequent
evolution of Gale crater. Small impact craters in the vicinity of the Curiosity MSL
landing site and rover traverse during the 364 Sols after landing have been studied
both from orbit and the surface. Evidence for the effect of impacts on basement outcrops
may include loose blocks of sandstone and conglomerate, and disrupted (fractured)
sedimentary layers, which are not obviously displaced by erosion. Impact ejecta blankets
are likely to be present, but in the absence of distinct glass or impact melt phases
are difficult to distinguish from sedimentary/volcaniclastic breccia and conglomerate
deposits. The occurrence of individual blocks with diverse petrological characteristics,
including igneous textures, have been identified across the surface of Bradbury Rise,
and some of these blocks may represent distal ejecta from larger craters in the vicinity
of Gale. Distal ejecta may also occur in the form of impact spherules identified in
the sediments and drift material. Possible examples of impactites in the form of shatter
cones, shocked rocks, and ropy textured fragments of materials that may have been
molten have been observed, but cannot be uniquely confirmed. Modification by aeolian
processes of craters smaller than 40 m in diameter observed in this study, are indicated
by erosion of crater rims, and infill of craters with aeolian and airfall dust deposits.
Estimates for resurfacing suggest that craters less than 15 m in diameter may represent
steady state between production and destruction. The smallest candidate impact crater
observed is ~0.6 m in diameter. The observed crater record and other data are consistent
with a resurfacing rate of the order of 10 mm/Myr; considerably greater than the
rate from impact cratering alone, but remarkably lower than terrestrial erosion rates. |
| 42250 |
authorList |
authors |
| 42250 |
status |
peerReviewed |
| 42250 |
volume |
249 |
| 42250 |
type |
AcademicArticle |
| 42250 |
type |
Article |
| 42250 |
label |
Newsom, Horton E.; Mangold, Nicolas; Kah, Linda C.; Williams, Joshua M.; Arvidson,
Ray E.; Stein, Nathan; Ollila, Ann M.; Bridges, John C.; Schwenzer, Susanne P. ; King,
Penelope L.; Grant, John A.; Pinet, Patrick; Bridges, Nathan T.; Calef, Fred; Wiens,
Roger C.; Spray, John G.; Vaniman, David T.; Elston, Wolf E.; Berger, Jeff A.; Garvin,
James B.; Palucis, Marisa C. and MSL, Science Team (2015). Gale crater and impact
processes – Curiosity’s first 364 Sols on Mars. Icarus, 249 pp. 108–128. |
| 42250 |
label |
Newsom, Horton E.; Mangold, Nicolas; Kah, Linda C.; Williams, Joshua M.; Arvidson,
Ray E.; Stein, Nathan; Ollila, Ann M.; Bridges, John C.; Schwenzer, Susanne P. ; King,
Penelope L.; Grant, John A.; Pinet, Patrick; Bridges, Nathan T.; Calef, Fred; Wiens,
Roger C.; Spray, John G.; Vaniman, David T.; Elston, Wolf E.; Berger, Jeff A.; Garvin,
James B.; Palucis, Marisa C. and MSL, Science Team (2015). Gale crater and impact
processes – Curiosity’s first 364 Sols on Mars. Icarus, 249 pp. 108–128. |
| 42250 |
Title |
Gale crater and impact processes – Curiosity’s first 364 Sols on Mars |
| 42250 |
in dataset |
oro |