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T1 Basalt and olivine dissolution under cold, salty, and acidic conditions. T2 What can we learn about recent aqueous weathering on Mars AU Hausrath, E. M. AU Brantley, Susan Louise. PY 20101216. Y1 20101216
The more rapid dissolution of fayalite than forsterite and glass under anoxic conditions suggests that ironrich olivine would dissolve more rapidly than Mgrich olivine on Mars. Olivine has been broadly documented on the surface of Mars Hamilton et al. , 2003 Hoefen et al. , 2003 Poulet et al. , 2007 , and Mg contents of Mars
on Earth. If dissolution on Mars occurs or occurred under conditions similar to our experiments, cation leaching would be expected to be accompanied by silica precipitates on weathering surfaces. Citation Hausrath, E. M., and S. L. Brantley 2010, Basalt and olivine dissolution under cold, salty, and acidic conditions
To test which variables may be important for weathering on Mars, the effects of temperature 22C, 6C, and 19C, high ionic strength, and oxygen concentrations were investigated in batch dissolution experiments containing forsterite, fayalite, and basalt glass. CaCl 2 NaClH 2 O brine can remain liquid to temperatures of 55C and thus may be liquid in the cold, dry climate that
Enhanced fayalite dissolution under anoxic conditions suggests that Ferich olivine would dissolve more rapidly than Mgrich olivine on Mars. Dissolution in the two most dilute experimental
The ferromagnesian minerals in the gabbro and basalt are subject to oxidation and chemical breakdown. tf Ferromagnesian minerals like olivine and pyroxene that crystallize at high temperatures in Bowen39s reaction series are generally much less susceptible to chemical weathering than quartz.
The effect of the distinct mineral dissolution behaviour also affects strongly the release rates of calcium. As can be deduced from Fig. 1, crystalline basalt dissolution at acid pH is dominated by the dissolution of olivine, which has a specific dissolution rate at least one order of magnitude higher than that of diopside and Carich
Hausrath, E. M. amp Brantley, S. L. Basalt and olivine dissolution under cold, salty, and acidic conditions What can we learn about recent aqueous weathering on Mars J. Geophys.
The enrichment in several major and trace elements observed in outlet fluids indicates that dissolution of olivine Si, Co, basalt Al, Zr and spinel Cr, V occurred, while the depleted Ca and
The mineral olivine l v i n is a magnesium iron silicate with the formula Mg 2, Fe 2 2 Si O, it is a type of nesosilicate or primary component of the Earth39s upper mantle, it is a common mineral in Earth39s subsurface, but weathers quickly on the surface.. The ratio of magnesium to iron varies between the two endmembers of the solid solution
Rates of olivine dissolution in synthetic lunar basalt 77LI5 and a silicaenriched 77115 composition Sil77115 at superliquidus temperatures have been determined. Polished olivine plates of known composition, orientation, and size were placed in basalt mixes contained in highpurity iron crucibles and heated in evacuated silica tubes. Olivine
The dissolution rate of forsteritic olivine in based on OB Mg data is slightly greater than that of SCO. This increase may be attributed to compositional differences increased Fe or result from Mg coming from sources other than olivine. Dissolution of plagioclase and pyroxene in basalt was followed using Ca release rates by assuming two Ca bear
Hausrath E.M. Brantley S.L. Basalt and olivine dissolution under cold, salty, and acidic conditions what can we learn about recent aqueous weathering on Mars J Geophys Res. 2010 115 doi 10.10292010JE003610. Hausrath E.M. Olsen A.A.
If the olivine grains are large enough they may be used as gemstones. Olivine as a gemstone is often named peridote. Olivine in basalt usually contains more Mg than Fe. Its chemical composition is Mg,Fe 2 SiO 4. Olivine is denser than most other minerals in basalt and it is also one of the first to start crystallizing.
Basalt US b s l t, b e s l t , UK b s l t, b s l t is a mafic extrusive igneous rock formed from the rapid cooling of magnesiumrich and ironrich lava exposed at or very near the surface of a terrestrial planet or a moon. More than 90 of all volcanic rock on Earth is basalt. Basalt lava has a low viscosity, due to its low silica content
The main purpose of this work is to understand and quantify diusive and convective olivine dissolution in basaltic melt. Crystal dissolution and growth in a magma chamber is often accompanied by the descent or ascent of the crystal in the chamber due to gravity. The motion induces convection that enhances mass transport.
Selected Publications. Journal Articles Basalt and olivine dissolution under cold, salty, and acidic conditions What can we learn about recent aqueous Sak, P., Steefel, C. and Brantley, S.L. 2008 Basalt weathering rates on Earth and the duration of liquid water on the plains of Gusev Crater
The dissolution etch pits at 50 C are easily identifiable due to the absence of surface precipitates as compared to the 80 C experiments. The etch pits appear to occur in diamondshaped patterns that are consistent with weathered pits observed by Velbel 2009 and the morphology of olivine dissolution in the Zaxis Eggleton, 1984.
To quantify this, we compiled data on dissolution of mantle olivine, labradorite, crystalline basalt, and basaltic glass in aqueous fluids, as well as data on mantle olivine carbonation. The dissolution data are calibrated as a function of surface area i.e., grain size and shape and pH, as well as temperature, whereas most of the ARC and ASU
Dissolution of basalt and depositing secondary minerals was described by Beryl Nashai, in 34Solubility of basalt under atmospheric conditions of temperature and pressure34. Also E. M. Hausrath and S. L. Brantley in 34Basalt and olivine dissolution under cold, salty, and acidic conditions What can we learn about recent aqueous weathering on Mars34
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