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Chemical weathering over hundreds of millions of years of greenhouse conditions on Mars

Michalski, Joseph R.; Ye, Binlong

Chemical weathering profiles on Mars which consist of an upper Al clay-rich, Fe-poor layer and lower Fe/Mg clay-rich layer are believed to have formed due to precipitation-driven top down leaching process in an ancient, reducing greenhouse climate. Here we use remote sensing imagery and spectroscopy coupled with topographic data and crater chronol…

Megashears and hydrothermalism at the Martian crustal dichotomy in Valles Marineris

Langlais, Benoit; Mège, Daniel; Gurgurewicz, Joanna +2 more

Observations of ancient deep deformation systems on Mars are important for constraining planetary dynamics, as well as to identify potential mineral resources. However, such systems were thought to be unexposed and inaccessible to analysis. Here, we apply structural and hyperspectral analyses, and correlate results with magnetic anomaly patterns, …