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Water Inside Mars

Water Inside Mars. Enriched Shergottites: High La/ Yb Low Sm/Nd (hence negative  Nd ) High Rb / Sr (hence high initial 87 Sr/ 86 Sr) Oxidized (higher oxygen fugacity) Depleted Shergottites: Low La/ Yb High Sm/Nd (hence positive  Nd ) Low Rb / Sr (hence low initial 87 Sr/ 86 Sr)

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Water Inside Mars

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  1. Water Inside Mars Enriched Shergottites: High La/Yb Low Sm/Nd (hence negative Nd) High Rb/Sr (hence high initial 87Sr/86Sr) Oxidized (higher oxygen fugacity) Depleted Shergottites: Low La/Yb High Sm/Nd (hence positive Nd) Low Rb/Sr (hence low initial 87Sr/86Sr) Reduced (lower oxygen fugacity) Apatite in Shergotty Do water contents in mantle sources of the enriched and depleted shergottites differ like other geochemical parameters do? Measuring OH contents in apatite in Shergotty (enriched) and QUE 94201 (depleted) can answer that question.

  2. Water Inside Mars Apatite: Ca5(PO4)3(F,Cl,OH) H2O Measurements: Shergotty: 0.46 to 0.86 wt% QUE 94201: 0.22 to 0.64 wt% H2O in magma when apatite crystallizes: Shergotty: 1.5 to 2.8 wt% QUE 94201: 0.7 to 2.1 wt% (McCubbin et al., 2012) H2O in pre-eruptive magma (assumes apatite crystallizes when 10% of melt remains): Shergotty: 0.15 to 0.29 wt% QUE 94201: 0.07 to 0.21 wt%

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