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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 |
---|---|---|---|---|
4.6620 | 1.8800 | -0.5820 | -0.544 | |
5.1180 | 2.1200 | -0.5820 | -0.541 | |
5.5830 | 2.3450 | -0.6030 | -0.558 |
Name | Class | δ18O | δ17O | Δ17O: calc | Δ δ18O | Δ δ17O | Δ Δ17O |
---|---|---|---|---|---|---|---|
Northwest Africa 6448 | Winonaite | 5.1340 | 2.1670 | -0.503 | 0.01 | 0.05 | 0.05 |
Northwest Africa 10851 | Winonaite | 5.0780 | 2.1490 | -0.492 | -0.04 | 0.03 | 0.06 |
Northwest Africa 6448 | Winonaite | 5.1550 | 2.1660 | -0.515 | 0.03 | 0.05 | 0.03 |
Northwest Africa 13917 | Winonaite | 5.1070 | 2.1790 | -0.477 | -0.01 | 0.06 | 0.07 |
Northwest Africa 12951 | Winonaite | 5.0350 | 2.1190 | -0.499 | -0.09 | 0 | 0.05 |
Northwest Africa 13432 | Winonaite | 5.1960 | 2.1960 | -0.506 | 0.07 | 0.08 | 0.04 |
Northwest Africa 10851 | Winonaite | 5.2420 | 2.2240 | -0.502 | 0.12 | 0.11 | 0.05 |
Grapevine Mesa | CBa | 5.2830 | 2.0910 | -0.656 | 0.16 | -0.02 | -0.11 |
Northwest Africa 13917 | Winonaite | 5.2360 | 2.2320 | -0.491 | 0.11 | 0.12 | 0.06 |
Northwest Africa 13917 | Winonaite | 4.9590 | 2.0550 | -0.524 | -0.16 | -0.06 | 0.02 |
Northwest Africa 1457 | Winonaite | 5.1000 | 2.3000 | -0.352 | -0.02 | 0.19 | 0.2 |
Northwest Africa 2251 | Howardite | 5.2000 | 2.3000 | -0.404 | 0.08 | 0.19 | 0.14 |
Errachidia 004 | Winonaite | 5.2760 | 2.2960 | -0.448 | 0.15 | 0.18 | 0.1 |
Northwest Africa 12951 | Winonaite | 4.8870 | 2.0490 | -0.492 | -0.23 | -0.07 | 0.06 |
Northwest Africa 13432 | Winonaite | 5.3280 | 2.2720 | -0.499 | 0.21 | 0.16 | 0.05 |
Northwest Africa 11729 | Eucrite-an | 4.9340 | 2.3010 | -0.265 | -0.19 | 0.19 | 0.28 |
Northwest Africa 1617 | Acapulcoite | 5.0600 | 1.8500 | -0.781 | -0.06 | -0.27 | -0.23 |
Old Homestead 003 | Howardite | 5.0200 | 2.3700 | -0.24 | -0.1 | 0.26 | 0.31 |
Northwest Africa 13432 | Winonaite | 4.8550 | 2.0160 | -0.509 | -0.27 | -0.1 | 0.04 |
Zag (b) | Winonaite | 4.8400 | 2.0600 | -0.457 | -0.28 | -0.06 | 0.09 |
Northwest Africa 6023 | Brachinite-an | 5.1100 | 2.4020 | -0.255 | -0.01 | 0.29 | 0.29 |
Northwest Africa 10602 | Eucrite-melt breccia | 4.9520 | 2.3490 | -0.226 | -0.17 | 0.23 | 0.32 |
Northwest Africa 10637 | Brachinite | 5.0480 | 2.4020 | -0.223 | -0.07 | 0.29 | 0.32 |
Ooldea 014 | Achondrite-prim-ung | 5.0450 | 1.8280 | -0.795 | -0.08 | -0.29 | -0.25 |
Old Homestead 003 | Howardite | 4.8800 | 2.3000 | -0.238 | -0.24 | 0.19 | 0.31 |
El Médano 395 | Brachinite | 4.8970 | 2.3290 | -0.217 | -0.22 | 0.21 | 0.33 |
Northwest Africa 12532 | Brachinite | 4.9080 | 2.3450 | -0.207 | -0.21 | 0.23 | 0.34 |
Northwest Africa 6023 | Brachinite-an | 4.8380 | 2.2690 | -0.247 | -0.28 | 0.15 | 0.3 |
Northwest Africa 6023 | Brachinite-an | 5.1620 | 2.4450 | -0.239 | 0.04 | 0.33 | 0.31 |
Northwest Africa 12532 | Brachinite | 5.1190 | 2.4560 | -0.206 | -0 | 0.34 | 0.34 |
Northwest Africa 2627 | Acapulcoite | 4.9300 | 1.8200 | -0.744 | -0.19 | -0.3 | -0.2 |
Northwest Africa 7904 | Brachinite | 4.7810 | 2.2100 | -0.276 | -0.34 | 0.09 | 0.27 |
Northwest Africa 6369 | Iron, IAB complex | 5.3900 | 2.3500 | -0.453 | 0.27 | 0.24 | 0.1 |
Grapevine Mesa | CBa | 4.9980 | 2.4560 | -0.143 | -0.12 | 0.34 | 0.4 |
Allan Hills 88046 | EH3 | 4.9050 | 2.4200 | -0.131 | -0.22 | 0.31 | 0.42 |
Northwest Africa 2904 | Eucrite-pmict | 4.7400 | 2.1300 | -0.335 | -0.38 | 0.01 | 0.21 |
Northwest Africa 6023 | Brachinite-an | 5.2260 | 2.4910 | -0.227 | 0.11 | 0.38 | 0.32 |
Jiddat al Harasis 556 | Howardite | 4.9800 | 2.4800 | -0.11 | -0.14 | 0.37 | 0.44 |
Northwest Africa 10851 | Winonaite | 5.4380 | 2.3450 | -0.483 | 0.32 | 0.23 | 0.07 |
Northwest Africa 7605 | Brachinite | 4.8220 | 2.3700 | -0.137 | -0.3 | 0.26 | 0.41 |
Northwest Africa 2627 | Acapulcoite | 4.9600 | 1.7500 | -0.829 | -0.16 | -0.37 | -0.28 |
Northwest Africa 3151 | Brachinite | 4.8600 | 2.4200 | -0.107 | -0.26 | 0.31 | 0.44 |
Northwest Africa 13735 | Winonaite | 4.7420 | 1.9740 | -0.492 | -0.38 | -0.14 | 0.06 |
Kota-Kota | EH3 | 5.1200 | 2.5200 | -0.142 | -0 | 0.41 | 0.41 |
Northwest Africa 2656 | Acapulcoite | 5.0500 | 1.7100 | -0.916 | -0.07 | -0.41 | -0.37 |
MacAlpine Hills 88136 | EL3 | 5.0010 | 2.5100 | -0.091 | -0.12 | 0.4 | 0.46 |
Northwest Africa 12951 | Winonaite | 4.7300 | 1.9690 | -0.491 | -0.39 | -0.15 | 0.06 |
Thiel Mountains 07014 | Eucrite | 5.2700 | 2.5100 | -0.23 | 0.15 | 0.4 | 0.32 |
Silistra | Achondrite-ung | 5.3000 | 2.5000 | -0.256 | 0.18 | 0.39 | 0.29 |
Northwest Africa 2340 | CR2 | 5.3700 | 1.7700 | -1.022 | 0.25 | -0.35 | -0.47 |
Northwest Africa 4042 | Achondrite-ung | 5.1780 | 2.5390 | -0.154 | 0.06 | 0.42 | 0.39 |
Northwest Africa 4929 | Brachinite | 5.3300 | 2.4900 | -0.282 | 0.21 | 0.38 | 0.27 |
Happy Canyon | EL6/7 | 4.9860 | 2.5260 | -0.067 | -0.14 | 0.41 | 0.48 |
Northwest Africa 2656 | Acapulcoite | 5.0400 | 1.6900 | -0.931 | -0.08 | -0.43 | -0.38 |
Northwest Africa 8059 | LL3.05 | 4.7020 | 2.2280 | -0.217 | -0.42 | 0.11 | 0.33 |
South Oman | EH4/5 | 5.4100 | 2.4400 | -0.373 | 0.29 | 0.33 | 0.17 |
Al Huwaysah 010 | Achondrite-ung | 4.7300 | 2.3100 | -0.15 | -0.39 | 0.2 | 0.4 |
Northwest Africa 10637 | Brachinite | 4.7940 | 2.4050 | -0.088 | -0.33 | 0.29 | 0.46 |
Northwest Africa 10637 | Brachinite | 5.2730 | 2.5260 | -0.216 | 0.15 | 0.41 | 0.33 |
Northwest Africa 11807 | Winonaite | 5.4870 | 2.3600 | -0.493 | 0.37 | 0.25 | 0.05 |
Northwest Africa 10423 | Eucrite-cm | 4.6900 | 2.2300 | -0.209 | -0.43 | 0.12 | 0.34 |
Ooldea 014 | Achondrite-prim-ung | 5.5510 | 1.9820 | -0.905 | 0.43 | -0.13 | -0.36 |
Yamato 691 | EH3 | 4.8300 | 2.4600 | -0.052 | -0.29 | 0.35 | 0.5 |
Northwest Africa 10497 | Brachinite | 4.6700 | 2.2200 | -0.208 | -0.45 | 0.11 | 0.34 |
Mayo Belwa | Aubrite | 4.9530 | 2.5470 | -0.029 | -0.17 | 0.43 | 0.52 |
Bishopville | Aubrite | 5.0850 | 2.5870 | -0.057 | -0.04 | 0.47 | 0.49 |
Northwest Africa 5400 | Achondrite-ung | 4.8800 | 2.5250 | -0.013 | -0.24 | 0.41 | 0.54 |
Pesyanoe | Aubrite | 4.7890 | 2.4570 | -0.033 | -0.33 | 0.34 | 0.51 |
Norton County | Aubrite | 4.9790 | 2.5720 | -0.017 | -0.14 | 0.46 | 0.53 |
Ramlat Fasad 531 | Winonaite | 5.5060 | 2.4000 | -0.463 | 0.39 | 0.29 | 0.08 |
Northwest Africa 6152 | Brachinite | 4.6500 | 2.2300 | -0.188 | -0.47 | 0.12 | 0.36 |
Dhofar 1983 | Lunar (feldsp. breccia) | 5.1000 | 2.6000 | -0.052 | -0.02 | 0.49 | 0.5 |
Northwest Africa 6152 | Brachinite | 4.6500 | 2.2400 | -0.178 | -0.47 | 0.13 | 0.37 |
Bustee | Aubrite | 4.8300 | 2.5100 | -0.002 | -0.29 | 0.4 | 0.55 |