Experimental study of argon sorption in quartz: Evidence for argon incompatibility

Roselieb, Knut; Blanc, Philippe; Büttner, Heinz; Jambon, Albert; Rammensee, W.; Rosenhauer, M.; Vielzeuf, Daniel; Walter, Heribert

doi:10.1016/s0016-7037(96)00360-2

Cited by 20 publications

(8 citation statements)

References 25 publications

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“…This phenomenon has been observed for Ar in feldspar (Wartho et al, 1999), He in garnet (Roberts, 1999), and for other noble gases in olivine (Heber et al, 2004). As shown by Roselieb et al (1997), this 'surface contamination' can reside in 'hot spots' on the surface possibly related to healed fractures and thus may not scale with surface area. Finally, diffusion data of Heber et al (2004) (D He Ol; 1000 C : 1-2 · 10 À15 cm 2 /s) extrapolated to 1350°C using the activation energy of Trull and Kurz (1993) The most striking features of Figs.…”

Section: Noble Gas Partitioning Data: Comparison With Previous Data Amentioning

confidence: 99%

Crystal–melt partitioning of noble gases (helium, neon, argon, krypton, and xenon) for olivine and clinopyroxene

Heber

Brooker

Kelley

et al. 2007

Geochimica et Cosmochimica Acta

163

118

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Section: Noble Gas Partitioning Data: Comparison With Previous Data Amentioning

confidence: 99%

Crystal–melt partitioning of noble gases (helium, neon, argon, krypton, and xenon) for olivine and clinopyroxene

Heber

Brooker

Kelley

et al. 2007

Geochimica et Cosmochimica Acta

163

118

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“…In this regard, the disparate conclusions of Watson and Cherniak (2003) and Thomas et al (2008) to Roselieb et al (1997) lead to different partition coefficients when compared to existing solubility data for other minerals. As this study highlights, depending upon the analytical method used, very different apparent diffusivities and apparent solubilities may be determined on the same mineral specimens.…”

Section: Argon Diffusion In Quartzmentioning

confidence: 96%

“…Quartz would be an effective sink for argon if, (1) the solubility of argon in quartz relative to the solubility of surrounding phases (i.e., partitioning) is high, and (2) if the diffusivity of argon into quartz is high enough to permit argon to enter the quartz over available timescales. However, apparent discrepancies have been identified when comparing the experimental studies of Watson and Cherniak (2003) and Thomas et al (2008) to that of Roselieb et al (1997) whose studies suggest argon diffusivity and solubility in quartz differ by several orders of magnitude. This apparent discrepancy may be because these studies approached the question of argon diffusivity and solubility from different experimental and analytical directions: Watson and Cherniak (2003) and Thomas et al (2008) used Rutherford Backscattering Spectroscopy (RBS) to measure diffusive uptake profiles in quartz at the 10's of nanometer scale, while Roselieb et al (1997) used bulk analysis and electron microprobe.…”

Section: Argon Diffusion In Quartzmentioning

confidence: 99%

Two diffusion pathways in quartz: A combined UV-laser and RBS study

Clay

Baxter

Cherniak

et al. 2010

Geochimica et Cosmochimica Acta

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The diffusive behavior of argon in quartz was investigated with three analytical depth profiling methods: Rutherford Backscattering Spectroscopy (RBS), 213 nm laser ablation, and 193 nm (Excimer) laser ablation on the same set of experimental samples. The integration of multiple depth profiling methods, each with different spatial resolution and sensitivity, allows for the cross-checking of methods where data ranges coincide. The use of multiple methods also allows for exploration of diffusive phenomena over multiple length-scales. Samples included both natural clear rock crystal quartz and synthetic citrine quartz. Laser analysis of clear quartz was compromised by poor coupling with the laser, whereas the citrine quartz was more easily analyzed (particularly with 193 nm laser). Diffusivity measured by both RBS and 193 nm laser ablation in the outermost 0.3 lm region of citrine quartz are self-consistent and in agreement with previously published RBS data on other quartz samples (including the clear quartz measured by RBS in this study). Apparent solubilities (extrapolated surface concentrations) for citrine quartz are in good agreement between RBS, 213 nm, and 193 nm laser analyses. Deeper penetration of argon measured up to 100 lm depth with the 213 nm laser reveal contributions of a second, faster diffusive pathway, effective in transporting much lower concentrations of argon into the crystal interiors of both clear and citrine quartz. By assuming such deep diffusion is dominated by fast pathways and approximating them as a network of planar features, the net diffusive uptake can be modeled and quantified with the Whipple-LeClaire equation, yielding dD b values of 1.32 Â 10 À14 to 9.1 Â 10 À17 cm 3 /s. While solubility values from the measured profiles confirm suggestions that quartz has a large capacity for argon uptake (making it a potentially important sink for argon in the crust), the slow rate of lattice diffusion may limit its capability to take up argon in shorter lived geologic environments and in experiments. In such shorter-lived systems, bulk argon diffusive uptake will be dominated by the fast pathway and the quartz lattice (including natural isolated defects that may also be storing argon) may never reach its equilibrium capacity.

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“…This is in addition to problems with the diffusive loss of the lighter noble gases (He and Ne) from crystal surfaces at room temperature as observed by Heber et al (2007). Anomalously high 'hot spots' of argon concentration, compared with average values were observed on the surface of quartz grains by Roselieb et al (1997), who argued that some previous experimental studies (e.g., Broadhurst et al, 1990Broadhurst et al, , 1992 showing unusually high noble gas partition coefficients were a consequence of surface enrichment of the noble gas.…”

Section: Surface Vs Bulk Incorporationmentioning

confidence: 96%