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Retention of Xenon in Quartz and Earth's Missing Xenon

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Science  18 Nov 2005:
Vol. 310, Issue 5751, pp. 1174-1177
DOI: 10.1126/science.1119070

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  1. Fig. 1.

    X-ray diffraction spectra. Asterisks denote Pt3Si peaks; Cr, cristobalite; Qz, quartz; Cs, coesite; C, graphite (heater); BN, boron nitride; arb., arbitrary. The dashed curve indicates the Xe liquid signal as observed in a magnesiowüstite + Xe experiment, added for comparison with the diffuse signal observed above 1100 K.

  2. Fig. 2.

    Phase diagram of silica for P and T conditions of in situ x-ray diffraction experiments. Gray lines represent the experimental path for each sample. CX1 and CX4, cristobalite and Xe; SGX1 and SGX2, glass and Xe. The time values indicate how long the samples were above the normal quartz-coesite transition. crist., cristobalite; trid., tridymite.

  3. Fig. 3.

    Scanning electron microprobe image of a 10 GPa and 2273 K run. (A) Pt-Si areas are bright and 1 to 10 μm wide. Xe-filled bubbles are bright, submicrometer to micrometer sized, and located inside coesite crystals. (Inset) Zoom on a Pt-Si–free zone. (B) Energy dispersive x-ray analysis spectra.