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Meteoritical Bulletin: Oxygen Isotope Plots

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Change values (separate multiple values with semicolons) -    δ18O:    δ17O:    Δ17O:
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Oxygen isotope composition of primitive achondrites (SNCs shown for comparison). Data for brachinites, winonaites, acapulcoite-lodranite clan from Greenwood et al. (2012). Data for ureilites from Clayton and Mayeda (1999). Data for Martian meteorites (SNCs) from Franchi et al. (1999) and compiled from laser fluorination analyses in the Meteoritical Bulletin. Δ17O calculated as: Δ17O = δ17O – 0.52δ18O. Individual winonaite and acapulcoite-lodranite clan samples are very highly susceptible to terrestrial weathering resulting in large shifts in δ18O and to a lesser extent Δ17O. Most analysis points for these two groups plotted on this diagram have been cleaned in EATG (ethanolamine thioglycollate) in order to reduce the influence of terrestrial weathering (see Greenwood et al., 2012 for further details). TFL: terrestrial fractionation line, Y&R: slope 1 line (Young and Russell, 1998), CCAM: carbonaceous chondrite anhydrous mineral line (Clayton et al., 1977; Clayton and Mayeda 1999).

References:


Data summary:
δ18Oδ17OΔ17O: givenΔ17O: linearComment
7.5663.214-0.781-0.72Δ17O off by 0.061
8.2043.670-0.662-0.596Δ17O off by 0.066
7.9573.249-0.952-0.889Δ17O off by 0.063
8.13.33-0.91-0.882 
8.263.41-0.89-0.885 

Nearest neighbors in MBDB (within 0.5 permil):
NameClassδ18Oδ17OΔ17O: calcΔ δ18OΔ δ17OΔ Δ17O
Northwest Africa 4520Ureilite8.07003.3200-0.8760.05 -0.05 -0.08
Northwest Africa 11119Achondrite-ung8.12103.3980-0.8250.1 0.02 -0.03
Northwest Africa 7111Ureilite8.12003.3030-0.9190.1 -0.07 -0.12
Northwest Africa 7325Achondrite-ung7.95703.2490-0.889-0.06 -0.13 -0.09
Northwest Africa 6356Ureilite-pmict7.84003.3200-0.757-0.18 -0.05 0.04
Northwest Africa 12209Ureilite8.20603.4020-0.8650.19 0.03 -0.07
Northwest Africa 4519Ureilite8.20003.2900-0.9740.18 -0.08 -0.18
Northwest Africa 11119Achondrite-ung8.22603.3640-0.9140.21 -0.01 -0.12
Northwest Africa 2895Ureilite8.24303.2700-1.0160.23 -0.1 -0.22
Northwest Africa 3156Ureilite7.76003.3200-0.715-0.26 -0.05 0.08
Northwest Africa 12207Ureilite7.90003.0600-1.048-0.12 -0.31 -0.25
Northwest Africa 11119Achondrite-ung7.78103.1330-0.913-0.24 -0.24 -0.12
Northwest Africa 7325Achondrite-ung8.20403.6700-0.5960.19 0.3 0.2
Northwest Africa 3156Ureilite7.69003.2400-0.759-0.33 -0.13 0.04
Sayh al Uhaymir 525Ureilite7.82103.6870-0.38-0.2 0.31 0.41
Northwest Africa 7306CM-an8.23203.0730-1.2080.21 -0.3 -0.41
Northwest Africa 5517Achondrite-ung7.68103.1170-0.877-0.34 -0.26 -0.08
Northwest Africa 12205Ureilite8.20603.7710-0.4960.19 0.4 0.3
Northwest Africa 11119Achondrite-ung7.67103.0460-0.943-0.35 -0.33 -0.15
Northwest Africa 11483Ureilite8.45003.5800-0.8140.43 0.21 -0.02
Northwest Africa 7325Achondrite-ung7.56603.2140-0.72-0.45 -0.16 0.07
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