Jarosite as an indicator of water-limited chemical weathering on Mars

  title={Jarosite as an indicator of water-limited chemical weathering on Mars},
  author={Megan E. Elwood Madden and Robert J. Bodnar and J. Donald Rimstidt},
The Mars Exploration Rover Opportunity identified the ferric sulphate mineral jarosite and possible relicts of gypsum at the Meridiani Planum landing site. On Earth, jarosite has been found to form in acid mine drainage environments, during the oxidation of sulphide minerals, and during alteration of volcanic rocks by acidic, sulphur-rich fluids near volcanic vents. Jarosite formation is thus thought to require a wet, oxidizing and acidic environment. But jarosite on Earth only persists over… 
Fluids in Planetary Systems
Analysis of chemical weathering assemblages observed at the Mars Exploration Rover (MER) Opportunity landing site at Meridiani Planum can be used to constrain the environmental conditions under which
A volcanic environment for bedrock diagenesis at Meridiani Planum on Mars
An alternative model for diagenesis of Meridiani bedrock is proposed that involves deposition of volcanic ash followed by reaction with condensed sulphur dioxide- and water-bearing vapours emitted from fumaroles, which invokes an environment considerably less favourable for biological activity on Mars than previously proposed interpretations.
Jarosite formation in deep Antarctic ice provides a window into acidic, water-limited weathering on Mars
Many interpretations have been proposed to explain the presence of jarosite within Martian surficial sediments, including the possibility that it precipitated within paleo-ice deposits owing to
Jarosite formation in deep Antarctic ice provides a window into acidic, water-limited weathering on Mars
In-situ formation of jarosite is reported in the Talos Dome ice core (East Antarctica) and it is shown that this ferric-potassium sulfate mineral is present in ice deeper than 1000 meters and progressively increases with depth, supporting the ice-weathering model for jarosite formation on Mars and highlighting the geologic importance of paleo ice-related processes on this planet.
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Abstract Remote sensing observations and rover missions have documented the presence of sulphate-rich mineral associations on Mars. Many of these minerals are paleo-indicators of hydrous, acidic and
Early geochemical environment of Mars as determined from thermodynamics of phyllosilicates
The results show that Fe3+-rich phyllosilicates probably precipitated under weakly acidic to alkaline pH, an environment different from that of the following period, which was dominated by strongly acid weathering that led to the sulphate deposits identified on Mars.
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Acid‐sulfate alteration of pyroclastic basalts in active fumaroles at Cerro Negro volcano, Nicaragua, was studied as a means to infer the mineralogical and chemical consequences of basalt alteration


Alteration Assemblages in Martian Meteorites: Implications for Near-Surface Processes
The SNC (Shergotty-Nakhla-Chassigny) meteorites have recorded interactions between martian crustal fluids and the parent igneous rocks. The resultant secondary minerals — which comprise up to ∼1
A chemical model for evaporites on early Mars: Possible sedimentary tracers of the early climate and implications for exploration
Martian geomorphology seems to indicate extensive hydrological activity during the Noachian era. Liquid water at the surface would require a large greenhouse effect that is widely hypothesized to
Acidic volatiles and the Mars soil
Large portions of Mars' surface are covered with deposits of fine, homogeneous, weathered dusty-soil material. Nanophase iron oxides, silicate mineraloids, and salts prevail in the soil. The mode of
Evidence of atmospheric sulphur in the martian regolith from sulphur isotopes in meteorites
Measurements of sulphur isotopes in oxidized and reduced phases from the SNC meteorites are presented together with the results of laboratory photolysis studies of two important martian atmospheric sulphur species (SO2 and H2S), which identify a mechanism for producing large abiogenic 34S fractionations in the surface sulphur reservoirs.
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The second MER rover (Opportunity) landed on Meridiani Planum on January 24, 2004 inside a shallow crater. The science rational for the selection of the landing site centered on detection of the
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Sulfurous gases released at the surface of Mars during episodes of volcanic activity would be naturally transported into the upper levels of the Martian atmosphere (20- to 30-km altitude) owing to