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- W4200064459 abstract "Abstract We determine the environmental setting and timing of enigmatic large‐scale chloride deposits on Mars, examining all available high‐resolution imagery globally, building digital elevation models, surveying targeted infrared images intersecting chloride deposits for accessory minerals (e.g., clay, carbonate, and sulfate), and performing crater counting for age‐dating when possible. We find that chloride deposits are commonly draped atop underlying topography, often associated with channels, sometimes perched above deep craters in local topographic lows, and span a wide range of elevations. Where measurable, chloride deposit thicknesses are typically <3 m. The deposits range in elevation over tens of meters, inconsistent with previous hypotheses of playa‐like environments, which are very flat. Chloride deposit elevations within larger basins are typically asymmetric with chloride deposits much higher on the inlet channel side, indicating that (a) surface water runoff was the most likely water source and (b) the basins were likely not filled completely with water in a deep lake setting but rather chlorides formed within a series of shallow ponds. Mass balance allows local sourcing from mobilization of cations and chlorine from dust/soil. Though prior global‐scale studies report chloride deposits superimposed on Noachian terrains, crater‐counting of local, stratigraphically‐associated datable surfaces shows chlorides superimposed on 3.4–2.3 Ga volcanic terrain. This indicates that surface waters forming chloride deposits continued through the Hesperian and into the Amazonian, making them among the latest‐formed, large‐scale deposits of water‐related minerals on Mars. Collectively, data suggest formation from meltwater from episodic ice/snow deposits continuing until 2.0–2.5 Ga." @default.
- W4200064459 created "2021-12-31" @default.
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- W4200064459 date "2022-01-07" @default.
- W4200064459 modified "2023-09-30" @default.
- W4200064459 title "Evidence for Deposition of Chloride on Mars From Small‐Volume Surface Water Events Into the Late Hesperian‐Early Amazonian" @default.
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- W4200064459 doi "https://doi.org/10.1029/2021av000534" @default.
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