Oxygen Isotopes

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The Martian Meteorite Compendium

Oxygen Isotopes

Figure 1: Graph of oxygen isotopic composition of Martian Meteorites and mineral separates from data given in attached table (references therein)
Figure 1: Graph of oxygen isotopic composition of Martian Meteorites and mineral separates from data given in attached table (references therein). Data obtained over a number of years, by different techniques, in different laboratories, is not often in agreement, but differes significantly from that of other meteorites and from terrestrial samples. Data define a Mars mass fractionation line, offset from the terrestrial mass fractionation line by about +0.32 per mil (Franchi et al. 1999). Oxygen isotopic data is "per mil", relative to SMOW.

Oxygen isotopes are reported as delta = [(RSAM–RSTD)/RSTD] x 1000, where R =17O/16O and 18O/16O delta 17 and delta 18 and SAM and STD denote sample and standard. On a delta 17 and delta 18 plot, mass fractionation produces a nearly linear array with slope of 0.52. (see discussion in introduction)

Oxygen Isotopes - Martian Meteorites

delta 17 delta 18 DELTA 17 reference
Nakhla px 2.69 4.55 0.32 Clayton and Mayeda 1996
Nakhla ol 2.49 4.1 0.36 Clayton and Mayeda 1996
Nakhla 3.017 5.216 0.305 Franchi et al. 1999
Lafayette 2.79 4.73 0.33 Clayton and Mayeda 1996
Lafayette px. 2.57 4.57 0.19 Clayton and Mayeda 1996
Lafayette px. 2.81 4.97 0.23 Romanek et al. 1998
Lafayette ol. 2.4 4.03 0.28 Clayton and Mayeda 1996
Lafayette ol. 2.56 4.35 0.31 Romanek et al. 1998
Lafayette 2.846 4.876 0.31 Franchi et al. 1999
Lafayette 2.99 5.17 0.3 Romanek et al. 1998
Chassigny 2.33 3.91 0.3 Clayton and Mayeda 1996
Chassigny 2.486 4.205 0.3 Franchi et al. 1999
Chassigny 2.64 4.46 0.32 Romanek et al. 1998
Shergotty 2.76 4.61 0.36 Clayton and Mayeda 1996
Shergotty 2.865 4.866 0.335 Franchi et al. 1999
Shergotty 2.97 5.06 0.34 Romanek et al. 1998
Zagami 2.75 4.55 0.38 Clayton and Mayeda 1996
Zagami 2.991 5.092 0.343 Franchi et al. 1999
Zagami 2.67 4.61 0.28 Romanek et al. 1998
ALH77005 2.18 3.88 0.16 Clayton and Mayeda 1996
ALH77005 2.64 4.449 0.326 Franchi et al. 1999
EETA79001A 2.46 4.23 0.28 Clayton and Mayeda 1996
EETA79001A 2.75 4.67 0.32 Romanek et al. 1998
EETA79001B 2.56 4.34 0.3 Clayton and Mayeda 1996
EETA79001B 2.67 4.64 0.25 Romanek et al. 1998
EETA79001 2.6 4.382 0.321 Franchi et al. 1999
LEW88516 2.39 4.14 0.26 Clayton and Mayeda 1996
ALH84001 2.58 4.53 0.22 Clayton and Mayeda 1996
ALH84001 2.743 4.644 0.327 Franchi et al. 1999
QUE94201 2.8 4.97 0.19 misprint C and M
QUE94201 2.546 4.266 0.327 Franchi et al. 1999
Y793605 2.3 4.01 0.21 Clayton and Mayeda 1996
DaG476 2.692 4.567 0.317 Franchi et al. 1999
DaG489 2.89 4.98 0.305 Folco et al. 2000
DaG670 2.86 4.95 0.28 Folco et al. 2000
Los Angeles 2.53 4.53 0.17 Rubin et al. 2000
SaU094 2.51 4.28 0.3 Gnos et al. 2002
Dhofar019 2.99 5.4 0.18 Taylor et al. 2002
NWA480 2.91 4.78 0.42 Barett et al. 2002
NWA817 3.2 5.44 0.37 Sautter et al. 2002
NWA856 3.09 5.03 0.47 Jambon et al. 2001
Dhofar378 2.52 4.46 Ikeda et al. 2002
NWA998 2.2 3.9 0.24 Irving et al. 2002
Y980459 2.52 4.31 0.28 Japanese Newsletter
YA1075 2.23 3.95 0.18 Yanai 2002