2:00 PM - 2:15 PM
[MIS11-02] Isotopic measurement of gas hydrate sample simulating environment of icy satellite and icy planet: Equipment development and consideration for observation method
Keywords:isotopic observation, isotopic fractionation, methane, icy satellite and icy planet, gas hydrate
In this study, we focus on CH4 hydrate which is reservoir to produce the plume (Kieffer et al. 2006) and want to evaluate isotopic fractionation with its formation. Isotopic fractionation with hydrate formation has been found at only δD of CH4 (~10‰) at the Earth condition (P: ~10 MPa) (e.g. Hachikubo et al. 2007, 2015; Lapham et al. 2012). In the case of condition of icy satellite and icy planet, pressure range of icy satellite and icy planet is wider than of the Earth, and therefore we need to estimate isotopic fractionation at 10–100 MPa scale. Thus we started design for cell for hydrate formation experiment at ice crust condition (P: ~150 MPa). In presentation, we will mainly introduce progress of the equipment development and observation method.
As next stage, we are also planning analyze isotopic fractionation of surface rocky core, and CH4 translation process using 3-D flow simulation for evaluate CH4 isotope changing in icy satellite and icy planet. We will subject to Enceladus, Europe and Triton as target.