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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). |
δ18O | δ17O | Δ17O: given | Δ17O: linear | Comment |
---|---|---|---|---|
6.6000 | 3.0100 | -0.4200 | -0.422 |
Name | Class | δ18O | δ17O | Δ17O: calc | Δ δ18O | Δ δ17O | Δ Δ17O |
---|---|---|---|---|---|---|---|
Dhofar 732 | Achondrite-ung | 6.6400 | 2.7700 | -0.683 | 0.04 | -0.24 | -0.26 |
Ooldea 014 | Achondrite-prim-ung | 6.5670 | 2.7660 | -0.649 | -0.03 | -0.24 | -0.23 |
Northwest Africa 11729 | Eucrite-an | 6.3120 | 3.0620 | -0.22 | -0.29 | 0.05 | 0.2 |
Kalahari 008 | Lunar (anorth) | 6.5200 | 3.3200 | -0.07 | -0.08 | 0.31 | 0.35 |
Northwest Africa 12592 | Lunar (frag. breccia) | 6.3330 | 3.2660 | -0.027 | -0.27 | 0.26 | 0.39 |
Northwest Africa 4415 | EL6 | 6.3880 | 3.3400 | 0.018 | -0.21 | 0.33 | 0.44 |
Northwest Africa 4416 | EL6 | 6.3850 | 3.3420 | 0.022 | -0.22 | 0.33 | 0.44 |
Northwest Africa 12593 | Lunar (frag. breccia) | 6.3610 | 3.3280 | 0.02 | -0.24 | 0.32 | 0.44 |
Northwest Africa 12821 | EL3 | 6.4020 | 3.3670 | 0.038 | -0.2 | 0.36 | 0.46 |
Northwest Africa 5517 | Achondrite-ung | 6.8070 | 2.6510 | -0.889 | 0.21 | -0.36 | -0.47 |
Northwest Africa 11444 | Lunar (melt breccia) | 6.2800 | 3.2800 | 0.014 | -0.32 | 0.27 | 0.44 |
Northwest Africa 10989 | Lunar | 6.5100 | 3.4200 | 0.035 | -0.09 | 0.41 | 0.46 |
Northwest Africa 12980 | Lunar (melt breccia) | 6.2890 | 3.2940 | 0.024 | -0.31 | 0.28 | 0.45 |
Northwest Africa 10085 | K4 | 6.8730 | 2.6740 | -0.9 | 0.27 | -0.34 | -0.48 |
Aridal 010 | Brachinite | 6.1700 | 3.1000 | -0.108 | -0.43 | 0.09 | 0.31 |
Northwest Africa 5517 | Achondrite-ung | 6.6180 | 2.5700 | -0.871 | 0.02 | -0.44 | -0.45 |
Dhofar 1436 | Lunar | 6.2440 | 3.2860 | 0.039 | -0.36 | 0.28 | 0.46 |
Dar al Gani 1031 | EL4 | 6.6200 | 3.4700 | 0.028 | 0.02 | 0.46 | 0.45 |
Galb Inal | Lunar | 6.1980 | 3.2380 | 0.015 | -0.4 | 0.23 | 0.44 |
Lynch 002 | Lunar | 6.6760 | 3.4700 | -0.002 | 0.08 | 0.46 | 0.42 |
Northwest Africa 12592 | Lunar (frag. breccia) | 6.1740 | 3.2170 | 0.007 | -0.43 | 0.21 | 0.43 |
Arabian Peninsula 007 | Lunar (frag. breccia) | 6.6460 | 3.4840 | 0.028 | 0.05 | 0.47 | 0.45 |
Ghadduwah 001 | Lunar (anorth) | 6.1520 | 3.1980 | -0.001 | -0.45 | 0.19 | 0.42 |
Northwest Africa 11558 | Achondrite-ung | 6.9900 | 2.7160 | -0.919 | 0.39 | -0.29 | -0.5 |