Anomalous Ne enrichment in obsidians and Darwin glass: Diffusion of noble gases in silica-rich glasses

Matsuda, Jun‐ichi; Matsubara, Kayo; Yajima, Haruaki; Yamamoto, Koshi

doi:10.1016/0016-7037(89)90178-6

Cited by 48 publications

(28 citation statements)

References 41 publications

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“…Secondly, the concentration of Ar and Xe in cherts (Figure 5f) is significantly lower than that found in other sediments In comparison to sediments (Figure 5b), the concentrations of Ar and Xe are 10-100x less in volcanic glasses while Ne is 10x higher. As argued by Matsuda et al [31], this strongly supports diffusively controlled filling of volcanic rocks as the primary control on the F(Ne) pattern in these glasses.…”

Section: Comparison Of Model Concepts and Literature Datasupporting

confidence: 78%

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Diffusive separation of noble gases and noble gas abundance patterns in sedimentary rocks

Torgersen

Kennedy

Soest

2004

Earth and Planetary Science Letters

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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 noble gas (Xe) diffusion relative to light noble gas (Ne) diffusion. Filling of lithic grains/half-spaces by diffusive processes thus produces Ne enrichments in the early and middle stages of the filling process with F(Ne) values similar to that observed in volcanic glasses. Emptying lithic grains/half-spaces produces a Xe-enriched residual in the late (but not final) stages of the process producing F(Xe) values similar to that observed in shales. 'Exotic …but unexceptional' shales that exhibit both F(Ne) and F(Xe) enrichments can be produced by incomplete emptying followed by incomplete filling. This mechanism is consistent with literature reported noble gas abundance patterns but may still require a separate mechanism for strong retention. A system of labyrinths-with-constrictions and/or C-, Sinanotubes when combined with simple adsorption can result in stronger diffusive separation and nonsteady-state enrichments that persist for longer times. Enhanced adsorption to multiple C atoms inside C-nanotubes as well as dangling functional groups closing the ends of nanotubes can provide potential mechanisms for 'strong retention'. We need new methods of examining noble gases in rocks to determine the role and function of angstrom-scale structures in both the diffusive enrichment process and the 'strong retention' process for noble gas abundances in terrestrial rocks.2

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Section: Comparison Of Model Concepts and Literature Datasupporting

confidence: 78%

“…(f) The noble gas abundances of cherts from sedimentary systems [30]. Figure 6: (a) Noble gas patterns in obsidians and glasses [31]. (b) Noble gas concentrations in obsidians and glasses [31].…”

Section: Discussionmentioning

confidence: 99%

Diffusive separation of noble gases and noble gas abundance patterns in sedimentary rocks

Torgersen

Kennedy

Soest

2004

Earth and Planetary Science Letters

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“…1 (Matsuda et al 1989;. Note that the difference in the F(20) values is not due to differences in neon concentration between Muong Nong-type tektites and normal tektites.…”

Section: Elemental Abundancementioning

confidence: 97%

“…We regard the amounts of Ne, Ar, Kr, and Xe released by crushing to represent the noble gases trapped in vesicles. Gases released from samples with grain sizes of <150 µm were regarded to represent the concentrations in the matrix (Hennecke et al 1975;Matsuda et al 1993;Palma et al 1997) and impact glasses: Darwin glass (Matsuda et al 1989), Libyan Desert glass, Zhamanshin glass and Aouelloul glass . The neon concentrations in all samples are confined to a small range.…”

Section: Noble Gas Distributionmentioning

confidence: 99%

“…Matsuda et al (1989) measured noble gas contents in Darwin impact glasses and found significant enrichments of neon compared to air. Neon enrichments have been recorded from silica-rich glasses, such as tektites (Hennecke et al 1975;Matsuda et al 1993;Palma et al 1997), impact glasses (Matsuda et al 1989;, and obsidians (Matsuda et al 1989;Miura and Nagao 1991). A laboratory study clearly demonstrated that these neon enrichments are due to the faster diffusion of neon, compared with the heavier noble gases, in glasses after solidification (Matsubara and Matsuda 1995).…”

Section: Introductionmentioning

confidence: 99%

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Noble gases in Muong Nong‐type tektites and their implications

Mizote

Matsumoto

Matsuda

et al. 2003

Meteorit & Planetary Scien

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The Sedimentary Record of Impact Events

Koeberl

2001

Accretion of Extraterrestrial Matter Throughout Earth’s History

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Some impact events in the geological record have been recognized because of the discovery of ejecta layers. Ejecta are classified into proximal ejecta, which are found in the immediate vicinity of an impact crater, within <5 crater radii from the rim, and distal ejecta, i.e., those that occur at considerable distances from the source crater (>5 crater radii from the crater rim). Distal ejecta consist of (usually fine-grained) rock and mineral fragments, and/or contain impact glasses.

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Anomalous Ne enrichment in obsidians and Darwin glass: Diffusion of noble gases in silica-rich glasses

Cited by 48 publications

References 41 publications

Diffusive separation of noble gases and noble gas abundance patterns in sedimentary rocks

Diffusive separation of noble gases and noble gas abundance patterns in sedimentary rocks

Noble gases in Muong Nong‐type tektites and their implications

The Sedimentary Record of Impact Events

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