Water Inside Mars

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