In Situ Evidence for an Ancient Aqueous Environment at Meridiani Planum, Mars

@article{Squyres2004InSE,
  title={In Situ Evidence for an Ancient Aqueous Environment at Meridiani Planum, Mars},
  author={Steven W. Squyres and John P. Grotzinger and Raymond E. Arvidson and J F Bell and Wendy M. Calvin and P. R. Christensen and Benton C. Clark and Joy Crisp and William H. Farrand and Kenneth E. Herkenhoff and J. R. Johnson and G{\"o}star Klingelh{\"o}fer and Andrew H. Knoll and Scott M. McLennan and Harry Y. McSween and Richard V. Morris and James William Rice and Rudolf Rieder and Laurence A. Soderblom},
  journal={Science},
  year={2004},
  volume={306},
  pages={1709 - 1714}
}
Sedimentary rocks at Eagle crater in Meridiani Planum are composed of fine-grained siliciclastic materials derived from weathering of basaltic rocks, sulfate minerals (including magnesium sulfate and jarosite) that constitute several tens of percent of the rock by weight, and hematite. Cross-stratification observed in rock outcrops indicates eolian and aqueous transport. Diagenetic features include hematite-rich concretions and crystal-mold vugs. We interpret the rocks to be a mixture of… 

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References

SHOWING 1-10 OF 58 REFERENCES

Jarosite and Hematite at Meridiani Planum from Opportunity's Mössbauer Spectrometer

Mössbauer spectra measured by the Opportunity rover revealed four mineralogical components in Meridiani Planum at Eagle crater: jarosite- and hematite-rich outcrop, hematite-rich soil,

The Opportunity Rover's Athena Science Investigation at Meridiani Planum, Mars

TLDR
The Mars Exploration Rover Opportunity has investigated the landing site in Eagle crater and the nearby plains within Meridiani Planum, and the rocks are interpreted to be a mixture of chemical and siliciclastic sediments formed by episodic inundation by shallow surface water, followed by evaporation, exposure, and desiccation.

Soils of Eagle Crater and Meridiani Planum at the Opportunity Rover Landing Site

TLDR
The soils at the Opportunity site are fine-grained basaltic sands mixed with dust and sulfate-rich outcrop debris and spherules emerge from soils coated, perhaps from subsurface cementation, by salts.

Mineralogy at Meridiani Planum from the Mini-TES Experiment on the Opportunity Rover

TLDR
The Miniature Thermal Emission Spectrometer on Opportunity investigated the mineral abundances and compositions of outcrops, rocks, and soils at Meridiani Planum, finding Bounce rock is dominated by clinopyroxene and is close in inferred mineral composition to the basaltic martian meteorites.

Chemistry of Rocks and Soils at Meridiani Planum from the Alpha Particle X-ray Spectrometer

TLDR
The Alpha Particle X-ray Spectrometer on the Opportunity rover determined major and minor elements of soils and rocks in Meridiani Planum, indicating the interaction with water in the past is indicated by the chemical features in rocks and soils.

Geological record of an acidic environment driven by iron hydrochemistry: The Tinto River system

[1] The existence of possible hematitic strata on the surface of Mars demands a search for terrestrial analogues formed in unusual environments. This will help us to recognize and interpret

Sedimentology and Geochemistry of Modern and Ancient Saline Lakes Models

Sedimentology and Geochemistry of Modern and Ancient Saline Lakes - This volume of papers grew out of a four-day symposium entitled ?Sedimentary and Paleolimnological Records of Saline Lakes? held at

Modes of Formation, Sedimentary Associations, and Diagnostic Features of Shallow-Water and Supratidal Evaporites

Production of brine depends critically on favorable physiographic setting and climate. The physiographic requirements are not common on a large scale, but are common on a small scale in the form of

Evidence from Opportunity's Microscopic Imager for Water on Meridiani Planum

The Microscopic Imager on the Opportunity rover analyzed textures of soils and rocks at Meridiani Planum at a scale of 31 micrometers per pixel. The uppermost millimeter of some soils is weakly

Geologic Nomenclature and Classification of Porosity in Sedimentary Carbonates

Pore systems in sedimentary carbonates are generally complex in their geometry and genesis, and commonly differ markedly from those of sandstones. Current nomenclature and classifications appear
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