Carbon isotope fractionation between graphite and diamond during shock experiments

Maruoka, Teruyuki; Koeberl, Christian; Matsuda, Jun‐ichi; Syono, Yasuhiko

doi:10.1111/j.1945-5100.2003.tb00311.x

Cited by 18 publications

(11 citation statements)

References 42 publications

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“…In other words, the δ 13 C feature is caused not by the kinetic isotope fractionation, but by the change in the composition of carbon‐bearing components. This suggestion is supported by previous reports [ Boslough et al , 1982 and Maruoka et al , 2003]. Our suggestion is also supported by the gas‐solid 13 C/ 12 C fractionation factor (α carbon ) of the shocked Murchison, which is nearly constant (≈1) at all degrees of decarbonization (Figure 2b).…”

Section: Resultssupporting

confidence: 92%

Shock‐induced isotope evolution of hydrogen and carbon in meteorites

Mimura

Okamoto

Nakatsuka

et al. 2005

Geophysical Research Letters

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[1] Single-and multiple-shock recovery experiments on Murchison meteorite samples were performed, to examine the shock-induced isotope behavior of their hydrogen and carbon contents. dD values of the shocked Murchison showed an initial increase from +10.6% to +59.1% before declining to À87.6%, as the dehydrogenation progressed. Isotope behavior of dD can be controlled by dehydrogenation involving extremely large isotope fractionation and is attributed to the composition of organic matter in the Murchison. On the other hand, the behavior of d 13 C simply decreased from À5.15% to À17.65% and is explainable by decarbonization only. The plot of those isotope data collected along devolatilization shows a variation curve that suggests the evolution of those isotopes in the meteorites. Shock is one of the processes effectively controlling the isotope features of the solar system. Citation: Mimura, K., M. Okamoto, T. Nakatsuka, K. Sugitani, and O. Abe (2005), Shock-induced isotope evolution of hydrogen and carbon in meteorites, Geophys. Res. Lett., 32, L11201,

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Section: Resultssupporting

confidence: 92%

Shock‐induced isotope evolution of hydrogen and carbon in meteorites

Mimura

Okamoto

Nakatsuka

et al. 2005

Geophysical Research Letters

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“…The isotopic composition of carbon was measured at the Department of Geological Sciences, University of Vienna, using a continuous flow isotopic ratio mass spectrometer (CF-IR-MS; Micromass Optima; Maruoka et al, 2003). The samples were weighed into tin capsules, which were introduced by an autosampler into the combustion chamber heated at 1020°C with helium gas flowing at 100 mL/min, and were oxidized by a pulse of oxygen.…”

Section: Samples and Experimental Proceduresmentioning

confidence: 99%

Isotopic composition of carbon in diamonds of diamondites: record of mass fractionation in the upper mantle 1 1Associate editor: B. Marty

Maruoka

Kurat

Dobosi

et al. 2004

Geochimica et Cosmochimica Acta

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“…The isotopic compositions of sulfur were determined to a precision of ±0.1 ‰ (1σ) for 30 µg of sulfur. Precisions were determined based on a combination of the standard deviations from repeated analyses of the samples and standards (Maruoka et al 2003b); the sample analyses were repeated at least four times.…”

Section: Sampling Locations and Analytical Methodsmentioning

confidence: 99%

Sulfur isotopic characteristics of volcanic products from the September 2014 Mount Ontake eruption, Japan

Ikehata

Maruoka

2016

Earth Planet Sp

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which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. AbstractComponents and sulfur isotopic compositions of pyroclastic materials from the 2014 Mt. Ontake eruption were investigated. The volcanic ash samples were found to be composed of altered volcanic fragments, alunite, anhydrite, biotite, cristobalite, gypsum, ilmenite, kaolin minerals, native sulfur, orthopyroxene, plagioclase, potassium feldspar, pyrite, pyrophyllite, quartz, rutile, and smectite, and most of these minerals were likely derived from the acidic alteration zones of Mt. Ontake. The absence of juvenile material in the eruptive products indicates that the eruption was phreatic. The sulfur isotopic compositions of the water-leached sulfate, hydrochloric acid-leached sulfate, acetone-leached native sulfur, and pyrite of the samples indicate that these sulfur species were produced by disproportionation of magmatic SO 2 in the hydrothermal system at temperatures of 270-281 °C. This temperature range is consistent with that inferred from the hydrothermal mineral assemblage (e.g., pyrophyllite and rutile) in the 2014 pyroclastic materials (200-300 °C). Except for the sulfur isotopic compositions of anhydrite, which may have been altered by incorporation of sulfate minerals in a fumarolic area with lower sulfur isotopic values into the underground materials during the 1979 eruption, no significant differences in the mineral assemblages and sulfur isotopic compositions of the pyroclastic materials were identified between the products of the 2014 and 1979 Ontake phreatic eruptions, which suggests geochemical similarities in the underlying hydrothermal systems before the 2014 and 1979 eruptions.

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Carbon isotope fractionation between graphite and diamond during shock experiments

Cited by 18 publications

References 42 publications

Shock‐induced isotope evolution of hydrogen and carbon in meteorites

Shock‐induced isotope evolution of hydrogen and carbon in meteorites

Isotopic composition of carbon in diamonds of diamondites: record of mass fractionation in the upper mantle 1 1Associate editor: B. Marty

Sulfur isotopic characteristics of volcanic products from the September 2014 Mount Ontake eruption, Japan

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