Formation of jarosite‐bearing deposits through aqueous oxidation of pyrite at Meridiani Planum, Mars
Citations Over TimeTop 10% of 2005 papers
Abstract
The discovery of sulfate‐rich layered deposits with hematite spherules at the landing site of the Opportunity rover is consistent with mineral deposition in an aqueous environment. We evaluate conditions responsible for the formation of a jarosite‐goethite‐gypsum assemblage with speciation calculations. The results show that the assemblage could have precipitated from acidic solutions formed through near‐surface aqueous oxidation of pyrite. Our hypothesis is that regional heating in the Meridiani Planum caused a release of sulfide‐rich hydrothermal waters, leading to formation of pyrite‐rich regional deposits in a depression. Aqueous oxidation of these deposits by atmospheric O 2 created an acidic environment that allowed formation of sulfates and goethite. Partial neutralization of the solution caused further goethite precipitation and conversion of jarosite to goethite, leading to formation of goethite concretions. Subsequent dehydration of goethite to coarse‐grained hematite would also have been facilitated by regional heating.
Related Papers
- → Formation of alunite, jarosite and hydrous iron oxides in a hypersaline system: Lake Tyrrell, Victoria, Australia(1992)116 cited
- → Chemical, crystallographic and stable isotopic properties of alunite and jarosite from acid—Hypersaline Australian lakes(1992)107 cited
- → Evaluation of the rate of dissolution of secondary sulfate minerals for effective acid and metalliferous drainage mitigation(2018)25 cited
- → The crystal structures of jarosite and svanbergite(1977)71 cited
- → Goethite and Jarosite Precipitation from Ferrous Sulfate Solutions(1993)29 cited