Irreversible adsorption of atmospheric helium on olivine: A lobster pot analogy
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- 作者：Marie Protin ; Pierre-Henri Blard ; blard@crpg.cnrs-nancy.fr" class="auth_mail" title="E-mail the corresponding author ; Yves Marrocchi ; Franç ; ois Mathon
- 刊名：Geochimica et Cosmochimica Acta
- 出版年：2016
- 出版时间：15 April 2016
- 年：2016
- 卷：179
- 期：Complete
- 页码：76-88
- 全文大小：932 K
文摘
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Finely crushed (<125 μm) olivines have significantly lower 3He/4He ratios than coarse fractions (>200 μm).
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These low ratios are interpreted as “surface-controlled” atmospheric contamination.
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In vacuo heating at 900 °C is not sufficient to completely remove the adsorbed component.
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This anomalous adsorption involves irreversible high-energy subsurface trapping (‘lobster-pot’ trapping).
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Fine fractions (<125 μm) should be avoided to avoid contaminating the noble gas inventory of silicates.