2004
DOI: 10.1016/j.epsl.2004.07.030
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Diffusive separation of noble gases and noble gas abundance patterns in sedimentary rocks

Abstract: The mechanisms responsible for noble gas concentrations, abundance patterns, and strong retentivity in sedimentary lithologies remain poorly explained. Diffusion-controlled fractionation of noble gases is modeled and examined as an explanation for the absolute and relative abundances of noble gases observed in sediments. Since the physical properties of the noble gases are strong functions of atomic mass, the individual diffusion coefficients, adsorption coefficients and atomic radii combine to impede heavy no… Show more

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Cited by 30 publications
(29 citation statements)
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“…During emptying of the rocks (for example during compaction and diagenesis), Xe slowly diffuses out the rock, producing a relative enrichment compared to lighter and faster noble gas Ar. Partial or incomplete filling and emptying of the rock could create the excesses of Ne and Xe, compared to Ar (Torgersen et al, 2004). Although the model of Torgersen et al (2004) is appealing, we need porosities of less than 1% and timescale of the order of hundreds of thousands or millions of years to produce the Ne and Xe enrichments observed in the StLawrence sediments.…”
Section: Discussionmentioning
confidence: 96%
See 1 more Smart Citation
“…During emptying of the rocks (for example during compaction and diagenesis), Xe slowly diffuses out the rock, producing a relative enrichment compared to lighter and faster noble gas Ar. Partial or incomplete filling and emptying of the rock could create the excesses of Ne and Xe, compared to Ar (Torgersen et al, 2004). Although the model of Torgersen et al (2004) is appealing, we need porosities of less than 1% and timescale of the order of hundreds of thousands or millions of years to produce the Ne and Xe enrichments observed in the StLawrence sediments.…”
Section: Discussionmentioning
confidence: 96%
“…Anomalous neon enrichments in terrestrial sedimentary rocks are common (e.g., Podosek et al, 1980;Matsubara and Matsuda, 1995) and they have been explained by diffusive processes (Matsubara and Matsuda, 1995;Pinti et al, 1999) or enhanced solubility (e.g., Pinti et al, 2004). Torgersen et al (2004) developed a model to explain the contemporary enrichments of lighter noble gas Ne and heavier Xe in sedimentary rocks. In their model, gases diffuse through half-spaces to fill the rock.…”
Section: Discussionmentioning
confidence: 99%
“…Atmosphere-derived Ne, Kr and Xe excesses have been reported in secondary silica phases, volcanic glasses, tektites, and in MORB and OIB basalts (Matsuda et al, 1989;Matsubara and Matsuda, 1995;Pinti et al, 1999). Torgersen et al (2004) have proposed that variable enrich- ments of noble gases can be accounted for by incomplete emptying followed by partial filling of lithic grains and half spaces, similar to the mechanism proposed by Pinti et al (1999) for air diffusion into fresh pumice. Pinti et al (op cit) further demonstrate that both elemental and isotopic compositions show clear mass dependent fractionation both between the elemental ratios and isotopic compositions of Ne and Ar.…”
Section: Fractionation Of 20 Ne/ 36 Ar (And 84 Kr/ 36 Ar 130 Xe/ 36 Ar)mentioning
confidence: 86%
“…6) may be caused by the release of atmosphere-derived Xe and Kr that is adsorbed and trapped in organic-rich sediments. 130 Xe/ 36 Ar enrichment factors up to $200 relative to water in equilibrium with air have been observed (Fanale and Cannon, 1971;Kennedy et al, 1990;Torgersen and Kennedy, 1999;Kennedy et al, 2002;Torgersen et al, 2004). Direct evidence that Kr and Xe excesses survive sedimentary consolidation and low degrees of thermal alteration is documented in Kr and Xe excesses observed in gas released by the biogenic breakdown of coal (Zhou et al, 2005).…”
Section: Fractionation Of 20 Ne/ 36 Ar (And 84 Kr/ 36 Ar 130 Xe/ 36 Ar)mentioning
confidence: 88%
“…For example, diffusion combined with adsorption in a porous media could result in diffusive separation and elemental fractionation (Torgersen et al, 2004). In a system of labyrinths-with constrictions and/or C-and Si-nanotubes, heavier noble gases with larger atomic radius can be trapped in these structures due to a restricted throat radius on the order of the atomic radius (Torgersen et al, 2004).…”
Section: Fractionation Processesmentioning
confidence: 99%