Computer Science
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl..98..245t&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 98, no. 2, May 1990, p. 245-261. Previously announced in STAR as N88-
Computer Science
19
Fractionation, Hydrogen Isotopes, Planetary Evolution, Serpentine, Shock, Vaporizing, Chemical Composition, Pressure Effects, Silicates, Weathering, Planets, Acceleration, Shock Effects, Hydrogen, Isotopes, Fractionation, Serpentine, Devolatilization, Laboratory Studies, Experiments, Pressure, Gases, Impacts, Enrichment, Deuterium, Procedure, Diagrams, Parameters, Water, Isotopic Ratios
Scientific paper
Impact-induced devolatilization of porous serpentine was investigated using two independent experimental methods, the gas recovery and the solid recovery method, each yielding nearly identical results. For shock pressures near incipient devolatilization, the hydrogen isotopic composition of the evolved H2O is very close to that of the starting material. For shock pressures at which up to 12 percent impact-induced devolatilization occurs, the bulk evolved gas is significantly lower in deuterium than the starting material. There is also significant reduction of H2O to H2 in gases recovered at these higher shock pressures, probably caused by reaction of evolved H2O with the metal gas recovery fixture. Gaseous H2O-H2 isotopic fractionation suggests high temperature isotopic equilibrium between the gaseous species, indicating initiation of devolatilization at sites of greater than average energy deposition. Bulk gas-residual solid isotopic fractionations indicate nonequilibrium, kinetic control of gas-solid isotopic ratios. Impact-induced hydrogen isotopic fractionation of hydrous silicates during accretion can stronly affect the long-term planetary isotopic ratios of planetary bodies, leaving the interiors enriched in deuterium. Depending on the model used for extrapolation of the isotopic fractionation to devolatilization fractions greater than those investigated experimentally can result from this process.
Ahrens Thomas J.
Epstein Samuel
Krishnamurthy R. V.
Tyburczy James A.
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