Thermodynamics of Shock Vaporization/Devolatilization of Volatile-Bearing Rocks and its Experimental Investigation

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  • KUROSAWA Kosuke
    Planetary Exploration Research Center, Chiba Institute of Technology
  • KOMATSU Goro
    Planetary Exploration Research Center, Chiba Institute of Technology International Research School of Planetary Sciences, Università d'Annunzio
  • YABUTA Hikaru
    Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University
  • MORIWAKI Ryota
    Institute for Geo-Cosmorlogy, Chiba Institute of Technology
  • OKAMOTO Takaya
    Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
  • SAKUMA Hiroshi
    Research Center for Functional Materials, National Institute for Materials Science
  • MATSUI Takafumi
    Planetary Exploration Research Center, Chiba Institute of Technology Institute for Geo-Cosmorlogy, Chiba Institute of Technology

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  • 衝撃誘起蒸発・脱ガス過程の熱力学と実験実証に向けた取り組み
  • ショウゲキ ユウキ ジョウハツ ・ ダツガス カテイ ノ ネツリキガク ト ジッケン ジッショウ ニ ムケタ トリクミ

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<p>In this article we first review the roles of hypervelocity impacts in volatile partitioning on planetary surfaces and thermodynamics of shock vaporization/devolatilization of geologic materials. Impact experiment in an open system is essential to accurately estimate the shock pressure required for incipient vaporization/devolatilization, and we introduce a newly-developed open system experimental technique applied to two-stage light gas guns. This experimental apparatus allows us to measure impact-generated gases with a mass spectrometer at the same geometry of natural impacts with a limited risk of chemical contamination from the gun operation. The threshold pressures of vaporization/devolatilization for halite and gypsum were measured to be 18-31 GPa and <11 GPa, respectively. The new open system method is expected to serve as a powerful tool to explore the nature of shock vaporization/devolatilization of geologic materials.</p>

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