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GRS constraints on the character of possible ancient oceans on Mars: consistencies with Earth analogues

AutorDohm, James M.; Baker, Víctor R.; Boynton, William V.; González Fairén, Alberto; Ferris, Justin C.; Finch, Michael; Furfaro, Roberto; Hare, Trent M.; Janes, Daniel M.; Kargel, Jeffrey S.; Karunatillake, Suniti; Keller, John; Kerry, Kris; Kim, Kyeong; Komatsu, Goro; Schulze-Makuch, Dirk; Marinangeli, Lucía; Ori, Gian G.; Ruiz Pérez, Javier
Palabras claveMars
Gamma Ray Spectrometer (GRS)
Potassium (K), thorium (Th), and iron (Fe) distribution
Evaporite deposits
Ancient acidic oceans
Fecha de publicaciónjun-2007
Citación2nd International Workshop - Exploring Mars and its Earth Analogues. Posters ; 112
ResumenThe Gamma Ray Spectrometer (GRS) has revealed elemental distributions of potassium (K), thorium (Th), and iron (Fe) on Mars that require fractionation of K (and possibly the others) consistent with aqueous weathering, transport, sorting, and deposition in the northern plains basins, as well as first-order geomorphological boundaries identified as putative shorelines. The elemental abundances occur in patterns consistent with deposition of weathered materials (salts and clastic minerals) and weathering/transport under neutral to acidic brines. The evidence is explained by hydrogeology, including playa (dry lake) environments that may have wet episodes during which water inundates the whole area. The formation of evaporite deposits, which includes the reworking of parent rock materials (e.g., leaching) and transport and subsequent precipitation, can be enhanced during aqueous acidic conditions as is commonly associated with mining operations. One of the best examples of the influence of mining on environmental conditions, which includes acidic aqueous conditions, leaching, transport of rock materials including elements, and precipitation of minerals such as hematite and jarosite, is the Tinto River in Spain. Even though the GRS elemental signatures, particularly the enrichment of K and Th, may be explained by differing igneous compositions, they are also consistent with ancient acidic oceans.
DescripciónPoster presented at 2nd International Workshop on Exploring Mars and its Earth Analogues, Trento, Italy, June 19-23, 2007; also presented at the 1st Kigam Workshop on Planetary Geology, June, 2008.-- All papers presented at the workshop to be published in a special issue of Journal of Planetary and Space Sciences, http://digital.csic.es/handle/10261/8618.
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