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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 |
---|---|---|---|---|
4.5410 | 1.8760 | -0.4860 | -0.485 |
Name | Class | δ18O | δ17O | Δ17O: calc | Δ δ18O | Δ δ17O | Δ Δ17O |
---|---|---|---|---|---|---|---|
Acfer 366 | CH3 | 4.6100 | 1.7810 | -0.616 | 0.07 | -0.1 | -0.13 |
Northwest Africa 12543 | Winonaite | 4.6620 | 1.8800 | -0.544 | 0.12 | 0 | -0.06 |
Northwest Africa 4937 | Winonaite | 4.3700 | 1.7630 | -0.509 | -0.17 | -0.11 | -0.02 |
Northwest Africa 12951 | Winonaite | 4.7300 | 1.9690 | -0.491 | 0.19 | 0.09 | -0.01 |
Allan Hills 12073 | Eucrite | 4.4000 | 2.0400 | -0.248 | -0.14 | 0.16 | 0.24 |
Northwest Africa 4882 | Brachinite | 4.4550 | 2.0950 | -0.222 | -0.09 | 0.22 | 0.26 |
Northwest Africa 4882 | Brachinite | 4.4550 | 2.0950 | -0.222 | -0.09 | 0.22 | 0.26 |
Northwest Africa 6484 | Lodranite | 4.5420 | 1.6350 | -0.727 | 0 | -0.24 | -0.24 |
Northwest Africa 12397 | Mesosiderite | 4.3230 | 1.9920 | -0.256 | -0.22 | 0.12 | 0.23 |
Northwest Africa 3213 | Mesosiderite | 4.5500 | 2.1300 | -0.236 | 0.01 | 0.25 | 0.25 |
Northwest Africa 739 | CH3 | 4.3200 | 1.7500 | -0.496 | -0.22 | -0.13 | -0.01 |
Northwest Africa 4882 | Brachinite | 4.3680 | 2.0640 | -0.207 | -0.17 | 0.19 | 0.28 |
Northwest Africa 4882 | Brachinite | 4.3680 | 2.0640 | -0.207 | -0.17 | 0.19 | 0.28 |
Northwest Africa 7025 | Mesosiderite | 4.3870 | 2.0820 | -0.199 | -0.15 | 0.21 | 0.29 |
Northwest Africa 4395 | Diogenite | 4.3900 | 2.0900 | -0.193 | -0.15 | 0.21 | 0.29 |
Northwest Africa 4872 | Brachinite | 4.3540 | 2.0610 | -0.203 | -0.19 | 0.19 | 0.28 |
Northwest Africa 4872 | Brachinite | 4.3540 | 2.0610 | -0.203 | -0.19 | 0.19 | 0.28 |
Northwest Africa 8659 | Eucrite | 4.3760 | 2.0830 | -0.193 | -0.17 | 0.21 | 0.29 |
Northwest Africa 4636 | Mesosiderite | 4.3800 | 2.0900 | -0.188 | -0.16 | 0.21 | 0.3 |
Northwest Africa 4418 | Mesosiderite | 4.5240 | 2.1450 | -0.207 | -0.02 | 0.27 | 0.28 |
Northwest Africa 4872 | Brachinite | 4.3080 | 2.0120 | -0.228 | -0.23 | 0.14 | 0.26 |
Northwest Africa 4872 | Brachinite | 4.3080 | 2.0120 | -0.228 | -0.23 | 0.14 | 0.26 |
Ramlat as Sahmah 309 | Brachinite | 4.3700 | 2.0900 | -0.182 | -0.17 | 0.21 | 0.3 |
Northwest Africa 2904 | Eucrite-pmict | 4.5800 | 2.1600 | -0.222 | 0.04 | 0.28 | 0.26 |
El Médano 395 | Brachinite | 4.2900 | 2.0200 | -0.211 | -0.25 | 0.14 | 0.27 |
Los Vientos 263 | Pallasite, ungrouped | 4.3400 | 2.0900 | -0.167 | -0.2 | 0.21 | 0.32 |
Northwest Africa 1500 | Achondrite-ung | 4.5600 | 1.5800 | -0.791 | 0.02 | -0.3 | -0.31 |
El Médano 395 | Brachinite | 4.5820 | 2.1700 | -0.213 | 0.04 | 0.29 | 0.27 |
Fortuna | Winonaite | 4.6800 | 1.6100 | -0.824 | 0.14 | -0.27 | -0.34 |
Northwest Africa 2627 | Acapulcoite | 4.5100 | 1.5600 | -0.785 | -0.03 | -0.32 | -0.3 |
Northwest Africa 2904 | Eucrite-pmict | 4.7400 | 2.1300 | -0.335 | 0.2 | 0.25 | 0.15 |
Jiddat al Harasis 395 | Diogenite | 4.2300 | 1.9900 | -0.21 | -0.31 | 0.11 | 0.28 |
Northwest Africa 13432 | Winonaite | 4.8550 | 2.0160 | -0.509 | 0.31 | 0.14 | -0.02 |
Zag (b) | Winonaite | 4.8400 | 2.0600 | -0.457 | 0.3 | 0.18 | 0.03 |
Northwest Africa 6690 | Diogenite | 4.1900 | 1.9400 | -0.239 | -0.35 | 0.06 | 0.25 |
Northwest Africa 4937 | Winonaite | 4.2060 | 1.7380 | -0.449 | -0.34 | -0.14 | 0.04 |
Northwest Africa 10497 | Brachinite | 4.6700 | 2.2200 | -0.208 | 0.13 | 0.34 | 0.28 |
Northwest Africa 10424 | Eucrite-cm | 4.1800 | 1.9500 | -0.224 | -0.36 | 0.07 | 0.26 |
Northwest Africa 6152 | Brachinite | 4.6500 | 2.2300 | -0.188 | 0.11 | 0.35 | 0.3 |
Northwest Africa 6152 | Brachinite | 4.6500 | 2.2400 | -0.178 | 0.11 | 0.36 | 0.31 |
Northwest Africa 10423 | Eucrite-cm | 4.6900 | 2.2300 | -0.209 | 0.15 | 0.35 | 0.28 |
Northwest Africa 13355 | Eucrite-an | 4.1570 | 1.8950 | -0.267 | -0.38 | 0.02 | 0.22 |
Northwest Africa 12951 | Winonaite | 4.8870 | 2.0490 | -0.492 | 0.35 | 0.17 | -0.01 |
Northwest Africa 8059 | LL3.05 | 4.7020 | 2.2280 | -0.217 | 0.16 | 0.35 | 0.27 |
Northwest Africa 2627 | Acapulcoite | 4.9300 | 1.8200 | -0.744 | 0.39 | -0.06 | -0.26 |
Northwest Africa 12338 | Achondrite-ung | 4.1600 | 1.9800 | -0.183 | -0.38 | 0.1 | 0.3 |
Northwest Africa 12004 | Angrite | 4.4400 | 2.2580 | -0.051 | -0.1 | 0.38 | 0.43 |
Northwest Africa 7025 | Mesosiderite | 4.1490 | 1.9610 | -0.196 | -0.39 | 0.09 | 0.29 |
Northwest Africa 2627 | Acapulcoite | 4.5100 | 1.4700 | -0.875 | -0.03 | -0.41 | -0.39 |
Northwest Africa 12004 | Angrite | 4.2840 | 2.1970 | -0.031 | -0.26 | 0.32 | 0.45 |
Northwest Africa 7904 | Brachinite | 4.7810 | 2.2100 | -0.276 | 0.24 | 0.33 | 0.21 |
Northwest Africa 12320 | Angrite | 4.4160 | 2.2680 | -0.028 | -0.13 | 0.39 | 0.46 |
Northwest Africa 11264 | Eucrite | 4.1300 | 1.9300 | -0.218 | -0.41 | 0.05 | 0.27 |
Northwest Africa 13457 | Eucrite | 4.1250 | 1.8750 | -0.27 | -0.42 | -0 | 0.22 |
Northwest Africa 12540 | Eucrite-an | 4.1200 | 1.9090 | -0.233 | -0.42 | 0.03 | 0.25 |
Northwest Africa 4399 | Acapulcoite | 4.8700 | 1.6100 | -0.922 | 0.33 | -0.27 | -0.44 |
Northwest Africa 12004 | Angrite | 4.4310 | 2.2850 | -0.019 | -0.11 | 0.41 | 0.47 |
Northwest Africa 12320 | Angrite | 4.4070 | 2.2810 | -0.011 | -0.13 | 0.41 | 0.47 |
Northwest Africa 6474 | Brachinite | 4.2340 | 2.1810 | -0.021 | -0.31 | 0.31 | 0.46 |
Northwest Africa 13355 | Eucrite-an | 4.1050 | 1.8710 | -0.264 | -0.44 | -0 | 0.22 |
Northwest Africa 2627 | Acapulcoite | 4.9600 | 1.7500 | -0.829 | 0.42 | -0.13 | -0.34 |
Northwest Africa 2999 | Angrite | 4.1540 | 2.0950 | -0.065 | -0.39 | 0.22 | 0.42 |
Northwest Africa 5363 | Achondrite-ung | 4.1830 | 2.1520 | -0.023 | -0.36 | 0.28 | 0.46 |
Northwest Africa 12320 | Angrite | 4.5450 | 2.3390 | -0.024 | 0 | 0.46 | 0.46 |
Ramlat as Sahmah 511 | Eucrite | 4.0800 | 1.9200 | -0.202 | -0.46 | 0.04 | 0.28 |
Jiddat al Harasis 845 | Mesosiderite-C2 | 4.0770 | 1.9380 | -0.182 | -0.46 | 0.06 | 0.3 |
Thiel Mountains 07009 | EL6 | 4.2100 | 2.2100 | 0.021 | -0.33 | 0.33 | 0.51 |
Al Huwaysah 010 | Achondrite-ung | 4.7300 | 2.3100 | -0.15 | 0.19 | 0.43 | 0.34 |
Northwest Africa 2177 | Eucrite | 4.0600 | 1.8900 | -0.221 | -0.48 | 0.01 | 0.26 |
Northwest Africa 2999 | Angrite | 4.0930 | 2.0540 | -0.074 | -0.45 | 0.18 | 0.41 |
Yamato 980110 | Ureilite | 4.6000 | 1.3900 | -1.002 | 0.06 | -0.49 | -0.52 |
Tindouf 005 | Eucrite-pmict | 4.0500 | 1.8900 | -0.216 | -0.49 | 0.01 | 0.27 |
Northwest Africa 6023 | Brachinite-an | 4.8380 | 2.2690 | -0.247 | 0.3 | 0.39 | 0.24 |
Northwest Africa 5400 | Achondrite-ung | 4.4860 | 2.3670 | 0.034 | -0.06 | 0.49 | 0.52 |
Jiddat al Harasis 845 | Mesosiderite-C2 | 4.0450 | 1.9290 | -0.174 | -0.5 | 0.05 | 0.31 |