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- W2751292569 abstract "Abstract Chloride‐bearing deposits on Mars record high‐elevation lakes during the waning stages of Mars' wet era (mid‐Noachian to late Hesperian). The water source pathways, seasonality, salinity, depth, lifetime, and paleoclimatic drivers of these widespread lakes are all unknown. Here we combine reaction‐transport modeling, orbital spectroscopy, and new volume estimates from high‐resolution digital terrain models, in order to constrain the hydrologic boundary conditions for forming the chlorides. Considering a T = 0°C system, we find that (1) individual lakes were >100 m deep and lasted decades or longer; (2) if volcanic degassing was the source of chlorine, then the water‐to‐rock ratio or the total water volume were probably low, consistent with brief excursions above the melting point and/or arid climate; (3) if the chlorine source was igneous chlorapatite, then Cl‐leaching events would require a (cumulative) time of >10 years at the melting point; and (4) Cl masses, divided by catchment area, give column densities 0.1–50 kg Cl/m 2 , and these column densities bracket the expected chlorapatite‐Cl content for a seasonally warm active layer. Deep groundwater was not required. Taken together, our results are consistent with Mars having a usually cold, horizontally segregated hydrosphere by the time chlorides formed." @default.
- W2751292569 created "2017-09-15" @default.
- W2751292569 creator A5052312960 @default.
- W2751292569 creator A5067357133 @default.
- W2751292569 date "2017-09-01" @default.
- W2751292569 modified "2023-09-24" @default.
- W2751292569 title "Paleohydrology on Mars constrained by mass balance and mineralogy of pre‐Amazonian sodium chloride lakes" @default.
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