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Fig. 7


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Abundances of clathrate hosts (in mole fraction) as a function of the alkanofer depth z: (a) for structure I clathrates; (b) for structure II clathrates. In both cases, the assumed liquid composition corresponds to the situation depicted in Fig. 4b, for which the crust undergoes a geothermal gradient. This gradient, together with pressure variations, has been taken into account consistently.

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