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"Jake Matijevic" an oracle from Mars
http://phys.org/news/2012-10-mars-curiosity.html#ajTabs
The rock is a mixture of insoluble salts from three acids. Silicic acid provides the oxyanion SiO4 for the formation of silicates such as olivine FeMgSiO4 and clay-feldspar Ca(AlSiO4)2. Metasilicic acid furnishes the oxyanion SiO3 for the formation of pyroxenes FeSiO3 and MgSiO3; metatitanic acid provides the oxyanion TiO3 for ilmenite FeTiO3. Formation of the acids requires water under pressure. Although shoreline volcanoes, such as Mt. Etna and Kilauea, can provide the water and pressures, most of these acids and rocks are formed at deep-sea volcanoes at pressures ~250 atmospheres. http://www.pmel.noaa.gov/vents/chemi...ges/vents2.gif To achieve the same pressures, Mars' ocean had to be more than ~6.65 km deep. Perhaps it's more than coincidence that formation of fresh rocks takes place at the same depth (pressure) as black smokers which are invariably accompanied by biota under most inimical conditions to life. http://www.guardian.co.uk/science/20...ighereducation John Curtis |
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