The signatures of martian surface water (green square) and primordial water (red triangle) have been observed in the martian meteorites LAR06319 and Yamato 980459, respectively (top). The distinct compositions of these reservoirs measured in tiny (<20 micrometer-sized) melt inclusions are shown in part per thousand differences in the hydrogen to deuterium ratio. Several of the studied inclusions hosted by the mineral olivine in Yamato 980459 are shown in a scanning electron microscope image (bottom). Credit: T. Usui & T. Imai.
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