Iron weathering products in a CO2+(H2O or H2O2) atmosphere: Implications for weathering processes on the surface of Mars

Chevrier, V. F.; Mathé, P.-E.; Rochette, P.; Grauby, Olivier; Bourrié, Guilhem; Trolard, Fabienne

doi:10.1016/j.gca.2006.06.1368

Cited by 42 publications

(28 citation statements)

References 84 publications

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“…This is consistent with experimental oxidative weathering of Fe-bearing minerals [Chevrier et al, 2006] …”

Section: ''Martian'' Solutionssupporting

confidence: 91%

Sulfur dioxide inhibits calcium carbonate precipitation: Implications for early Mars and Earth

Halevy¹,

Schrag²

2009

Geophysical Research Letters

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[1] Recent studies have suggested a role for sulfur dioxide (SO 2 ) in maintaining relatively warm surface temperatures on early Mars. Here we show experimentally, that SO 2 concentrations orders of magnitude lower than those required for it to have been of climatic importance strongly affect the aqueous chemistry and the precipitated mineral assemblage. At near-neutral pH, part-per-billion concentrations of SO 2 prevent the formation of calcium carbonate in favor of hannebachite, a hydrated calcium sulfite. In the presence of iron, possible precursors to phyllosilicate minerals and iron carbonate co-precipitate with hannebachite. This provides an explanation for the existence of early Noachian phyllosilicates in the apparent dearth of outcrop-scale calcium carbonates. Oxidation of this precipitated assemblage produces sulfates, iron oxides and acidity, consistent with evidence for late Noachian -early Hesperian acid-sulfate dominated environments. For early Earth, the results allow placing an upper limit on atmospheric SO 2 concentrations for any period in which carbonates exist in the geologic record.

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“…This is consistent with experimental oxidative weathering of Fe-bearing minerals [Chevrier et al, 2006] …”

Section: ''Martian'' Solutionssupporting

confidence: 91%

Sulfur dioxide inhibits calcium carbonate precipitation: Implications for early Mars and Earth

Halevy¹,

Schrag²

2009

Geophysical Research Letters

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“…Our experimental apparatus was similar to the one already used by Chevrier et al (2004Chevrier et al ( , 2006 and is described in Fig. 1.…”

Section: Methodsmentioning

confidence: 99%

“…Two potential sources of contamination existed: (1) room air outside the apparatus and (2) gases dissolved in the water put at the bottom of the desiccators. Concerning (1), although our equipment did not allow direct sampling of the atmosphere inside the desiccators, previous experiments using the same apparatus (Chevrier et al, 2004(Chevrier et al, , 2006 have shown that vacuum desiccators were effectively airtight at a year scale. This was verified again here by checking at regular intervals the internal pressure of the desiccators using a manometer.…”

Section: Methodsmentioning

confidence: 99%

“…For the Fe-sulfide, we chose natural hexagonal pyrrhotite (HPo) Fe 0.9 S from Ducktown Mine, Tennessee (Carpenter, 1974), which was already used for similar studies (Chevrier et al, 2004(Chevrier et al, , 2006. Pyrrhotite is known to be abundant in some SNC meteorites (Rochette et al, 2001;Lorand et al, 2005) and is thought to exist in near-surface deposits on Mars (Burns and Fisher, 1990b;Rochette et al, 2003).…”

Section: Descriptionmentioning

confidence: 99%

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Evaluating the role of sulfide-weathering in the formation of sulfates or carbonates on Mars

Dehouck

Chevrier

Gaudin

et al. 2012

Geochimica et Cosmochimica Acta

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“…The correlation between susceptibility and metal content has been calibrated experimentally by measuring dispersed synthetic spherical grains in plaster with variable dilution. These grains have on average a diameter of 5 µm (see their description in Chevrier et al 2006) and are therefore in a multidomain state: the threshold to the stable single domain state is below 0.1 µm. Figure 1 shows a perfect linear correlation with metal content from 0.1 to 50%, leading to an apparent specific susceptibility of 544 × 10 −6 m 3 /kg for the metal spheres used.…”

Section: Magnetic Mineralogy Of Stony Achondritesmentioning

confidence: 99%

Magnetic classification of stony meteorites: 3. Achondrites

Rochette

Gattacceca

Bourot-Denise

et al. 2009

Meteorit & Planetary Scien

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Abstract-A database of magnetic susceptibility measurements of stony achondrites (acapulcoitelodranite clan, winonaites, ureilites, angrites, aubrites, brachinites, howardite-eucrite-diogenite (HED) clan, and Martian meteorites, except lunar meteorites) is presented and compared to our previous work on chondrites. This database provides an exhaustive study of the amount of iron-nickel magnetic phases (essentially metal and more rarely pyrrhotite and titanomagnetite) in these meteorites. Except for ureilites, achondrites appear much more heterogeneous than chondrites in metal content, both at the meteorite scale and at the parent body scale. We propose a model to explain the lack of or inefficient metal segregation in a low gravity context. The relationship between grain density and magnetic susceptibility is discussed. Saturation remanence appears quite weak in most metal-bearing achondrites (HED and aubrites) compared to Martian meteorites. Ureilites are a notable exception and can carry a strong remanence, similar to most chondrites.

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Iron weathering products in a CO2+(H2O or H2O2) atmosphere: Implications for weathering processes on the surface of Mars

Cited by 42 publications

References 84 publications

Sulfur dioxide inhibits calcium carbonate precipitation: Implications for early Mars and Earth

Sulfur dioxide inhibits calcium carbonate precipitation: Implications for early Mars and Earth

Evaluating the role of sulfide-weathering in the formation of sulfates or carbonates on Mars

Magnetic classification of stony meteorites: 3. Achondrites

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