Transcript Short Slide Summary

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.
http://www.psrd.hawaii.edu/July12/water-inside-Mars.html
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%
http://www.psrd.hawaii.edu/July12/water-inside-Mars.html