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Water on Mars, Contributors - Coggle Diagram
Water on Mars
inferences
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clays, salts and oxides originate from water interacting with materials such as glass, olivine, pyroxene, and feldspars
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Fe, Mg clays are prominent, and tend to be "mobile", comparative to the "immobile" minority that are aluminium clays.
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weathering (could be from water or wind), could have made the rocks more Al rich over time.
certain conditions require certain availabilities of water, and therefore can be used to determine conditions of the time
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smectites and chlorite form under anoxic, alkaline conditions
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observations
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north pole has ice caps
water sublimates in spring-summer, condensing at south pole, with the reverse occurring during the other seasons
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models
findings
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Fe, Mg minerals most likely from before late noach.
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Hydrothermal subsurface circulation (ground waters, surface water etc.) constant-ish until mid noach, then started decreasing until plateauing in amazonian
early-middle noachian = mostly groundwater, little surface water
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late hesperian - amazonian = very little groundwater, no surface water
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early mars?
water rich, neutral (Noachian) ->
near-surface water, acidic (Hesperian)
CO2 pressure 100-1000 times higher than present, or different gas composition
arid, icy, low atmospheric pressure, groundwater
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