Global ETD Search
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Showing 1 to 5 of 5 for “"equilibrium fractionation"”.
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Modeling Departures From Abiotic Expectations During the Calcium Carbonate Precipitation Process
… influences on CaCO3 mineralization and isotope fractionation by: performing kinetic experiments directly within a modern carbonate spring; determining the carbon and oxygen isotopic composition of aragonite and coexisting spring water; and modeling these experimental results to establish whether …
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Experimental studies of iron-magnesium order-disorder in orthopyroxene: Equilibrium, kinetics, and applications
… the site occupancies. The behavior of Mn on the equilibrium fractionation of Fe-Mg was studied by a series of annealing experiments using a naturally occurring Mn-rich orthopyroxene (donpeacorite). It was shown that, although Mn and Fe preferentially order to the M2 site relative to Mg, Mn has a …
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Spatially controlled Fe isotope variations at Torres Del Paine
… granites. Likewise, experimentally determined equilibrium fractionation factors argue against fractional crystallization producing the isotopically heavy granites. Loss of a magnetite equilibrated Fe-bearing fluid would enrich the high silica granites in isotopically heavy Fe; however, the need …
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Chromium and uranium isotopic exchange kinetics and isotope fractionation during oxidation of tetravalent uranium by dissolved oxygen
… thorough understanding of relevant isotope fractionation mechanisms, many of which are still poorly understood. Isotopic exchange and oxidation reactions are two types of them. High concentration, acidic-pH experiments were conducted to determine equilibrium fractionations between hexavalent …
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Iron Isotope Cosmochemistry
… and ungrouped meteorites. I discuss iron isotope fractionations among these extraterrestrial materials in term of solar nebular processing, asteroidal parent-body processing, planetary differentiation: core-mantle differentiation and crust formation), magmatism, and planetary surface …