2021
DOI: 10.1016/j.icarus.2020.114099
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Stability and composition of CH4-rich clathrate hydrates in the present martian subsurface

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Cited by 5 publications
(6 citation statements)
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“…[8][9][10][11][12] These compounds are naturally present in permafrost regions of Earth (such as Antarctica and Greenland) and in ocean sediments and are also expected to be in astrophysical environments such as Titan's atmosphere, Mars polar caps and icy comets. 13,14 Although many types of clathrate hydrate structures are in principle plausible, only a limited number of them occur in nature: the cubic structures sI and sII and the hexagonal structure sH. 15 All three classes consist of a hydrogen-bonded water framework composed by different building blocks (see Fig.…”
mentioning
confidence: 99%
“…[8][9][10][11][12] These compounds are naturally present in permafrost regions of Earth (such as Antarctica and Greenland) and in ocean sediments and are also expected to be in astrophysical environments such as Titan's atmosphere, Mars polar caps and icy comets. 13,14 Although many types of clathrate hydrate structures are in principle plausible, only a limited number of them occur in nature: the cubic structures sI and sII and the hexagonal structure sH. 15 All three classes consist of a hydrogen-bonded water framework composed by different building blocks (see Fig.…”
mentioning
confidence: 99%
“…This rate is consistent with liberal estimates of the maximum methane production rate by serpentinization reactions on Mars (Stevens et al., 2015) in addition to measurements of methanogenic microbes at depth in Mars‐analog terrestrial settings (Colwell et al., 2008; Onstott et al., 2006). Methane‐clathrate‐hydrate (MCH) reservoirs have also been hypothesized as a potential source of methane (Gloesener, 2019; Gloesener et al., 2021; Pla‐García et al., 2019), though the associated release of methane would likely be episodic and therefore not well‐represented by a continuous subsurface source. Our model assumes direct source rock‐to‐seepage pathway similar to that described in Etiope et al.…”
Section: Methods: Fractured‐rock Heat and Mass Transport Simulations ...mentioning
confidence: 99%
“…Their density, and therefore whether they sink or float, depends on the relative incorporation of CO 2 and CH 4 as the guest molecules in the clathrate structure. To calculate the clathrate's density and the fraction of guest species incorporated in the clathrate phase from a specified initial gas composition at given temperature and pressure, we follow the approach from Gloesener et al (2021). Full details of the approach are in Appendix B.…”
Section: Ocean Freezing and Clathrate Productionmentioning
confidence: 99%
“…Thus, it seems plausible that most N 2 would escape enclathration within a primordial Plutonian ocean (Kamata et al 2019). Future work should seek to quantify the extent and implications of N 2 and H 2 clathrate formation (which requires ∼16 MPa and >200 MPa at 273 K to form single component clathrates but needs lower pressures if these guest species are incorporated in small quantities within CO 2 and/or CH 4 clathrates; Sloan & Koh 2007;Gloesener et al 2021), as well as determine whether there are any evolution pathways that may lead to high molalities of species like CO or H 2 S, in the ocean.…”
Section: Modeling Assumptions and Uncertaintiesmentioning
confidence: 99%
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