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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 |
---|---|---|---|---|
4.6500 | 2.2300 | -0.2130 | -0.188 | |
4.6500 | 2.2400 | -0.2100 | -0.178 |
Name | Class | δ18O | δ17O | Δ17O: calc | Δ δ18O | Δ δ17O | Δ Δ17O |
---|---|---|---|---|---|---|---|
Northwest Africa 10497 | Brachinite | 4.6700 | 2.2200 | -0.208 | 0.02 | -0.02 | -0.03 |
Northwest Africa 10423 | Eucrite-cm | 4.6900 | 2.2300 | -0.209 | 0.04 | -0.01 | -0.03 |
Northwest Africa 8059 | LL3.05 | 4.7020 | 2.2280 | -0.217 | 0.05 | -0.01 | -0.03 |
El Médano 395 | Brachinite | 4.5820 | 2.1700 | -0.213 | -0.07 | -0.07 | -0.03 |
Northwest Africa 2904 | Eucrite-pmict | 4.5800 | 2.1600 | -0.222 | -0.07 | -0.08 | -0.04 |
Al Huwaysah 010 | Achondrite-ung | 4.7300 | 2.3100 | -0.15 | 0.08 | 0.07 | 0.03 |
Northwest Africa 7904 | Brachinite | 4.7810 | 2.2100 | -0.276 | 0.13 | -0.03 | -0.09 |
Northwest Africa 2904 | Eucrite-pmict | 4.7400 | 2.1300 | -0.335 | 0.09 | -0.11 | -0.15 |
Northwest Africa 3213 | Mesosiderite | 4.5500 | 2.1300 | -0.236 | -0.1 | -0.11 | -0.05 |
Northwest Africa 12320 | Angrite | 4.5450 | 2.3390 | -0.024 | -0.11 | 0.1 | 0.16 |
Northwest Africa 4418 | Mesosiderite | 4.5240 | 2.1450 | -0.207 | -0.13 | -0.09 | -0.02 |
Northwest Africa 8173 | Enst achon | 4.6000 | 2.4000 | 0.008 | -0.05 | 0.17 | 0.19 |
Northwest Africa 6023 | Brachinite-an | 4.8380 | 2.2690 | -0.247 | 0.19 | 0.03 | -0.06 |
Northwest Africa 6292 | Achondrite-ung | 4.5500 | 2.4200 | 0.054 | -0.1 | 0.19 | 0.24 |
Northwest Africa 5400 | Achondrite-ung | 4.4860 | 2.3670 | 0.034 | -0.16 | 0.13 | 0.22 |
Northwest Africa 12004 | Angrite | 4.4400 | 2.2580 | -0.051 | -0.21 | 0.02 | 0.13 |
Northwest Africa 7605 | Brachinite | 4.8220 | 2.3700 | -0.137 | 0.17 | 0.14 | 0.05 |
Northwest Africa 10637 | Brachinite | 4.7940 | 2.4050 | -0.088 | 0.14 | 0.17 | 0.1 |
Northwest Africa 12004 | Angrite | 4.4310 | 2.2850 | -0.019 | -0.22 | 0.05 | 0.16 |
Northwest Africa 12320 | Angrite | 4.4160 | 2.2680 | -0.028 | -0.23 | 0.03 | 0.15 |
Old Homestead 003 | Howardite | 4.8800 | 2.3000 | -0.238 | 0.23 | 0.06 | -0.05 |
Northwest Africa 4882 | Brachinite | 4.4550 | 2.0950 | -0.222 | -0.2 | -0.14 | -0.04 |
Northwest Africa 4882 | Brachinite | 4.4550 | 2.0950 | -0.222 | -0.2 | -0.14 | -0.04 |
Northwest Africa 12320 | Angrite | 4.4070 | 2.2810 | -0.011 | -0.24 | 0.05 | 0.17 |
Zag (b) | Winonaite | 4.8400 | 2.0600 | -0.457 | 0.19 | -0.18 | -0.27 |
El Médano 395 | Brachinite | 4.8970 | 2.3290 | -0.217 | 0.25 | 0.09 | -0.03 |
Northwest Africa 12951 | Winonaite | 4.7300 | 1.9690 | -0.491 | 0.08 | -0.27 | -0.31 |
Northwest Africa 3151 | Brachinite | 4.8600 | 2.4200 | -0.107 | 0.21 | 0.19 | 0.08 |
Northwest Africa 11729 | Eucrite-an | 4.9340 | 2.3010 | -0.265 | 0.28 | 0.07 | -0.08 |
Northwest Africa 4395 | Diogenite | 4.3900 | 2.0900 | -0.193 | -0.26 | -0.15 | -0.01 |
Northwest Africa 13432 | Winonaite | 4.8550 | 2.0160 | -0.509 | 0.21 | -0.22 | -0.33 |
Northwest Africa 12951 | Winonaite | 4.8870 | 2.0490 | -0.492 | 0.24 | -0.19 | -0.31 |
Northwest Africa 7025 | Mesosiderite | 4.3870 | 2.0820 | -0.199 | -0.26 | -0.15 | -0.02 |
Northwest Africa 4636 | Mesosiderite | 4.3800 | 2.0900 | -0.188 | -0.27 | -0.15 | -0 |
Northwest Africa 8659 | Eucrite | 4.3760 | 2.0830 | -0.193 | -0.27 | -0.15 | -0.01 |
Ramlat as Sahmah 309 | Brachinite | 4.3700 | 2.0900 | -0.182 | -0.28 | -0.15 | 0 |
Allan Hills 12073 | Eucrite | 4.4000 | 2.0400 | -0.248 | -0.25 | -0.2 | -0.07 |
Northwest Africa 10602 | Eucrite-melt breccia | 4.9520 | 2.3490 | -0.226 | 0.3 | 0.11 | -0.04 |
Northwest Africa 4882 | Brachinite | 4.3680 | 2.0640 | -0.207 | -0.28 | -0.17 | -0.02 |
Northwest Africa 4882 | Brachinite | 4.3680 | 2.0640 | -0.207 | -0.28 | -0.17 | -0.02 |
Northwest Africa 8124 | LL3 | 4.7180 | 2.5680 | 0.115 | 0.07 | 0.33 | 0.3 |
Los Vientos 263 | Pallasite, ungrouped | 4.3400 | 2.0900 | -0.167 | -0.31 | -0.15 | 0.02 |
Dhofar 378 | Martian (shergottite) | 4.4600 | 2.5200 | 0.201 | -0.19 | 0.29 | 0.38 |
Northwest Africa 4872 | Brachinite | 4.3540 | 2.0610 | -0.203 | -0.3 | -0.17 | -0.02 |
Northwest Africa 4872 | Brachinite | 4.3540 | 2.0610 | -0.203 | -0.3 | -0.17 | -0.02 |
Northwest Africa 12543 | Winonaite | 4.6620 | 1.8800 | -0.544 | 0.01 | -0.36 | -0.36 |
Northwest Africa 8686 | Martian (shergottite) | 4.4170 | 2.5110 | 0.214 | -0.23 | 0.28 | 0.4 |
Northwest Africa 12004 | Angrite | 4.2840 | 2.1970 | -0.031 | -0.37 | -0.04 | 0.15 |
Northwest Africa 5400 | Achondrite-ung | 4.8800 | 2.5250 | -0.013 | 0.23 | 0.29 | 0.17 |
Northwest Africa 11917 | Winonaite | 4.5410 | 1.8760 | -0.485 | -0.11 | -0.36 | -0.3 |
Northwest Africa 10593 | Martian (shergottite) | 4.4840 | 2.5820 | 0.25 | -0.17 | 0.35 | 0.43 |
Old Homestead 003 | Howardite | 5.0200 | 2.3700 | -0.24 | 0.37 | 0.14 | -0.06 |
Northwest Africa 2986 | Martian (shergottite) | 4.4500 | 2.5800 | 0.266 | -0.2 | 0.35 | 0.45 |
Northwest Africa 12522 | Martian (shergottite) | 4.4260 | 2.5670 | 0.265 | -0.22 | 0.33 | 0.45 |
Northwest Africa 12241 | Martian (shergottite) | 4.6200 | 2.6350 | 0.233 | -0.03 | 0.4 | 0.42 |
Northwest Africa 12951 | Winonaite | 5.0350 | 2.1190 | -0.499 | 0.39 | -0.12 | -0.32 |
Northwest Africa 5718 | Martian (shergottite) | 4.4700 | 2.6000 | 0.276 | -0.18 | 0.37 | 0.46 |
Northwest Africa 12397 | Mesosiderite | 4.3230 | 1.9920 | -0.256 | -0.33 | -0.24 | -0.07 |
Northwest Africa 4872 | Brachinite | 4.3080 | 2.0120 | -0.228 | -0.34 | -0.22 | -0.05 |
Northwest Africa 4872 | Brachinite | 4.3080 | 2.0120 | -0.228 | -0.34 | -0.22 | -0.05 |
Northwest Africa 10153 | Martian (nakhlite) | 4.4460 | 2.5910 | 0.279 | -0.2 | 0.36 | 0.46 |
Northwest Africa 7032 | Martian (shergottite) | 4.4230 | 2.5770 | 0.277 | -0.23 | 0.34 | 0.46 |
Jiddat al Harasis 556 | Howardite | 4.9800 | 2.4800 | -0.11 | 0.33 | 0.25 | 0.07 |
Northwest Africa 8679 | Martian (shergottite) | 4.5620 | 2.6420 | 0.27 | -0.09 | 0.41 | 0.45 |
Allan Hills 84001 | Martian (OPX) | 4.6000 | 2.6500 | 0.258 | -0.05 | 0.42 | 0.44 |
El Médano 395 | Brachinite | 4.2900 | 2.0200 | -0.211 | -0.36 | -0.22 | -0.03 |
Northwest Africa 6474 | Brachinite | 4.2340 | 2.1810 | -0.021 | -0.42 | -0.05 | 0.16 |
Northwest Africa 10416 | Martian | 4.5000 | 2.6300 | 0.29 | -0.15 | 0.4 | 0.47 |
Northwest Africa 10416 | Martian | 4.3920 | 2.5730 | 0.289 | -0.26 | 0.34 | 0.47 |
Northwest Africa 8649 | LL3.05 | 4.4640 | 2.6230 | 0.302 | -0.19 | 0.39 | 0.48 |
Northwest Africa 10416 | Martian | 4.3100 | 2.5000 | 0.259 | -0.34 | 0.27 | 0.44 |
Northwest Africa 10637 | Brachinite | 5.0480 | 2.4020 | -0.223 | 0.4 | 0.17 | -0.04 |
Northwest Africa 6963 | Martian (shergottite) | 4.3320 | 2.5280 | 0.275 | -0.32 | 0.29 | 0.46 |
Northwest Africa 10851 | Winonaite | 5.0780 | 2.1490 | -0.492 | 0.43 | -0.09 | -0.31 |
Northwest Africa 2986 | Martian (shergottite) | 4.5900 | 2.6700 | 0.283 | -0.06 | 0.44 | 0.47 |
Northwest Africa 10593 | Martian (shergottite) | 4.3730 | 2.5760 | 0.302 | -0.28 | 0.34 | 0.49 |
Northwest Africa 10720 | Martian (nakhlite) | 4.5810 | 2.6690 | 0.287 | -0.07 | 0.43 | 0.47 |
Thiel Mountains 07009 | EL6 | 4.2100 | 2.2100 | 0.021 | -0.44 | -0.03 | 0.2 |
Yamato 980459 | Martian (shergottite) | 4.3100 | 2.5200 | 0.279 | -0.34 | 0.29 | 0.46 |
Yamato 980459 | Martian (shergottite) | 4.3100 | 2.5200 | 0.279 | -0.34 | 0.29 | 0.46 |
Northwest Africa 10416 | Martian | 4.5390 | 2.6680 | 0.308 | -0.11 | 0.43 | 0.49 |
Northwest Africa 5718 | Martian (shergottite) | 4.2900 | 2.5000 | 0.269 | -0.36 | 0.27 | 0.45 |
Northwest Africa 10153 | Martian (nakhlite) | 4.5790 | 2.6770 | 0.296 | -0.07 | 0.44 | 0.48 |
Northwest Africa 10808 | Martian (shergottite) | 4.6600 | 2.6830 | 0.26 | 0.01 | 0.45 | 0.44 |
Northwest Africa 7032 | Martian (shergottite) | 4.5990 | 2.6810 | 0.29 | -0.05 | 0.45 | 0.47 |
Northwest Africa 8656 | Martian (shergottite) | 4.4170 | 2.6230 | 0.326 | -0.23 | 0.39 | 0.51 |
Sayh al Uhaymir 094 | Martian (shergottite) | 4.2900 | 2.5100 | 0.279 | -0.36 | 0.27 | 0.46 |
Northwest Africa 1457 | Winonaite | 5.1000 | 2.3000 | -0.352 | 0.45 | 0.06 | -0.17 |
Acfer 366 | CH3 | 4.6100 | 1.7810 | -0.616 | -0.04 | -0.45 | -0.43 |
Northwest Africa 8694 | Martian (Chassignite) | 4.5500 | 2.6800 | 0.314 | -0.1 | 0.45 | 0.5 |
Northwest Africa 7387 | Martian (shergottite) | 4.5400 | 2.6800 | 0.319 | -0.11 | 0.45 | 0.5 |
Dar al Gani 476 | Martian (shergottite) | 4.5700 | 2.6900 | 0.314 | -0.08 | 0.46 | 0.5 |
Northwest Africa 7944 | Martian (shergottite) | 4.3740 | 2.6150 | 0.341 | -0.28 | 0.38 | 0.52 |
Northwest Africa 5363 | Achondrite-ung | 4.1830 | 2.1520 | -0.023 | -0.47 | -0.08 | 0.16 |
Northwest Africa 10593 | Martian (shergottite) | 4.6910 | 2.7100 | 0.271 | 0.04 | 0.48 | 0.45 |
Northwest Africa 8656 | Martian (shergottite) | 4.2760 | 2.5340 | 0.31 | -0.37 | 0.3 | 0.49 |
Northwest Africa 10416 | Martian | 4.6270 | 2.7160 | 0.31 | -0.02 | 0.48 | 0.49 |
Northwest Africa 12543 | Winonaite | 5.1180 | 2.1200 | -0.541 | 0.47 | -0.12 | -0.36 |
Northwest Africa 10416 | Martian | 4.4450 | 2.6740 | 0.363 | -0.21 | 0.44 | 0.55 |
Jiddat al Harasis 395 | Diogenite | 4.2300 | 1.9900 | -0.21 | -0.42 | -0.25 | -0.03 |
Northwest Africa 13134 | Martian (shergottite) | 4.5030 | 2.6990 | 0.357 | -0.15 | 0.46 | 0.54 |
Northwest Africa 8686 | Martian (shergottite) | 4.6710 | 2.7230 | 0.294 | 0.02 | 0.49 | 0.48 |
Northwest Africa 6448 | Winonaite | 5.1340 | 2.1670 | -0.503 | 0.48 | -0.07 | -0.32 |
Northwest Africa 6023 | Brachinite-an | 5.1100 | 2.4020 | -0.255 | 0.46 | 0.17 | -0.07 |
Northwest Africa 2986 | Martian (shergottite) | 4.6500 | 2.7300 | 0.312 | 0 | 0.5 | 0.5 |
Northwest Africa 5990 | Martian (shergottite) | 4.2100 | 2.4700 | 0.281 | -0.44 | 0.24 | 0.46 |
Northwest Africa 8276 | L3.00 | 4.6430 | 2.7340 | 0.32 | -0.01 | 0.5 | 0.5 |