Clay minerals on Mars: Riotinto mining district (Huelva, Spain) as Earth analogue for acidic alteration pathways

Christian Mavris1, Javier Cuadros1, Janice L Bishop2, Jose Miguel Nieto3 and Joseph R Michalski4, (1)Natural History Museum, London, United Kingdom, (2)SETI Institute, Carl Sagan Center, Mountain View, United States, (3)University of Huelva, Departamento de Geologia, Huelva, Spain, (4)Planetary Science Institute Tucson, Tucson, AZ, United States
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