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Oxygen isotope composition of main-group pallasites and mesosiderites. Data for main-group pallasites and mesosiderites from Greenwood et al. (2006). Solid lines through data points show the mean Δ17O value for each group. Grey-shaded boxes depict the 2σ error on the mesosiderite and main-group pallasite population Δ17O and δ18O mean values. Open squares are individual mesosiderite analyses, open circles individual pallasite analyses. The dashed line labelled (1) is the eucrite fractionation line of Greenwood et al. (2005); the dashed line labelled (2) shows the range of HED values obtained by Weichert et al. (2004). Δ17O is linearized using the format of Miller (2002): Δ17O = 1000 ln (1+ (δ17O/1000)) – λ1000 ln (1+ ( δ18O/1000)) where λ = 0.5247. TFL = Terrestrial Fractionation Line. |
δ18O | δ17O | Δ17O: given | Δ17O: Miller (2002) | Comment |
---|---|---|---|---|
3.0290 | 1.3830 | -0.1870 | -0.206 |
Name | Class | δ18O | δ17O | Δ17O: calc | Δ δ18O | Δ δ17O | Δ Δ17O |
---|---|---|---|---|---|---|---|
Jepara | Pallasite, PMG | 3.0110 | 1.3670 | -0.213 | -0.02 | -0.02 | -0.01 |
Northwest Africa 10252 | Pallasite, PMG-an | 3.0490 | 1.3510 | -0.249 | 0.02 | -0.03 | -0.04 |
Northwest Africa 5784 | Diogenite | 3.1000 | 1.3900 | -0.237 | 0.07 | 0.01 | -0.03 |
Northwest Africa 5721 | Eucrite | 2.9900 | 1.3200 | -0.249 | -0.04 | -0.06 | -0.04 |
Northwest Africa 10154 | Diogenite-an | 3.0860 | 1.3320 | -0.287 | 0.06 | -0.05 | -0.08 |
Northwest Africa 2968 | Achondrite-ung | 3.0800 | 1.4400 | -0.176 | 0.05 | 0.06 | 0.03 |
Northwest Africa 4223 | Diogenite | 3.0800 | 1.4400 | -0.176 | 0.05 | 0.06 | 0.03 |
Northwest Africa 8739 | Eucrite-pmict | 2.9900 | 1.3120 | -0.257 | -0.04 | -0.07 | -0.05 |
Northwest Africa 8404 | Diogenite-olivine | 3.1030 | 1.3280 | -0.3 | 0.07 | -0.05 | -0.09 |
Tirhert | Eucrite-unbr | 2.9610 | 1.3140 | -0.24 | -0.07 | -0.07 | -0.03 |
Northwest Africa 10752 | Diogenite | 3.0060 | 1.2790 | -0.298 | -0.02 | -0.1 | -0.09 |
Northwest Africa 12566 | Mesosiderite-C3 | 3.1320 | 1.4250 | -0.218 | 0.1 | 0.04 | -0.01 |
Jiddat al Harasis 203 | Mesosiderite-C2 | 3.1430 | 1.4030 | -0.246 | 0.11 | 0.02 | -0.04 |
Jepara | Pallasite, PMG | 3.1600 | 1.3800 | -0.278 | 0.13 | -0 | -0.07 |
Northwest Africa 10752 | Diogenite | 3.1590 | 1.3610 | -0.296 | 0.13 | -0.02 | -0.09 |
Northwest Africa 1880 | Diogenite | 3.1600 | 1.4200 | -0.238 | 0.13 | 0.04 | -0.03 |
Northwest Africa 10023 | Pallasite, PMG-an | 3.1430 | 1.4580 | -0.191 | 0.11 | 0.08 | 0.02 |
Northwest Africa 10023 | Pallasite, PMG-an | 3.1670 | 1.4400 | -0.222 | 0.14 | 0.06 | -0.02 |
Northwest Africa 1461 | Diogenite | 3.1770 | 1.4100 | -0.257 | 0.15 | 0.03 | -0.05 |
Yamato 980318 | Eucrite-cm | 3.1800 | 1.3600 | -0.308 | 0.15 | -0.02 | -0.1 |
Yamato 980318 | Eucrite-cm | 3.1800 | 1.3600 | -0.308 | 0.15 | -0.02 | -0.1 |
Northwest Africa 5312 | Mesosiderite | 3.1490 | 1.4840 | -0.168 | 0.12 | 0.1 | 0.04 |
Northwest Africa 5721 | Eucrite | 2.9300 | 1.2600 | -0.277 | -0.1 | -0.12 | -0.07 |
Northwest Africa 1817 | Mesosiderite-B | 3.1900 | 1.4600 | -0.214 | 0.16 | 0.08 | -0.01 |
Northwest Africa 4215 | Diogenite | 3.2030 | 1.4310 | -0.25 | 0.17 | 0.05 | -0.04 |
Northwest Africa 8777 | Achondrite-ung | 2.9120 | 1.2390 | -0.289 | -0.12 | -0.14 | -0.08 |
Tirhert | Eucrite-unbr | 2.8660 | 1.2860 | -0.218 | -0.16 | -0.1 | -0.01 |
Northwest Africa 12566 | Mesosiderite-C3 | 3.2090 | 1.4780 | -0.206 | 0.18 | 0.1 | 0 |
Northwest Africa 4223 | Diogenite | 3.2200 | 1.4800 | -0.21 | 0.19 | 0.1 | -0 |
Northwest Africa 8404 | Diogenite-olivine | 3.2330 | 1.4520 | -0.244 | 0.2 | 0.07 | -0.04 |
Northwest Africa 8777 | Achondrite-ung | 2.8510 | 1.2570 | -0.239 | -0.18 | -0.13 | -0.03 |
Tirhert | Eucrite-unbr | 3.2330 | 1.4740 | -0.222 | 0.2 | 0.09 | -0.02 |
Northwest Africa 4255 | Diogenite | 3.2500 | 1.3100 | -0.395 | 0.22 | -0.07 | -0.19 |
Erg Chech 002 | Achondrite-ung | 3.2010 | 1.5480 | -0.132 | 0.17 | 0.17 | 0.07 |
Chasseron | Pallasite, PMG | 3.2390 | 1.5140 | -0.186 | 0.21 | 0.13 | 0.02 |
Tirhert | Eucrite-unbr | 3.2680 | 1.4510 | -0.264 | 0.24 | 0.07 | -0.06 |
Graves Nunataks 98098 | Eucrite-unbr | 3.3000 | 1.4000 | -0.331 | 0.27 | 0.02 | -0.12 |
Northwest Africa 10019 | Pallasite, ungrouped | 3.2860 | 1.4790 | -0.245 | 0.26 | 0.1 | -0.04 |
Northwest Africa 1882 | Mesosiderite-C | 3.3600 | 1.4200 | -0.343 | 0.33 | 0.04 | -0.14 |
Thiel Mountains 07016 | Pallasite | 3.3100 | 1.5700 | -0.167 | 0.28 | 0.19 | 0.04 |
Northwest Africa 4271 | Eucrite-pmict | 3.3400 | 1.2500 | -0.502 | 0.31 | -0.13 | -0.3 |
Northwest Africa 10019 | Pallasite, ungrouped | 3.3590 | 1.5290 | -0.233 | 0.33 | 0.15 | -0.03 |
Northwest Africa 5312 | Mesosiderite | 3.3640 | 1.5450 | -0.22 | 0.34 | 0.16 | -0.01 |
Ramlat as Sahmah 287 | Diogenite | 3.3800 | 1.5300 | -0.243 | 0.35 | 0.15 | -0.04 |
Bilanga | Diogenite | 3.4100 | 1.3500 | -0.439 | 0.38 | -0.03 | -0.23 |
Northwest Africa 10023 | Pallasite, PMG-an | 3.3680 | 1.5720 | -0.195 | 0.34 | 0.19 | 0.01 |
Northwest Africa 2993 | Achondrite-ung | 2.6610 | 1.2200 | -0.176 | -0.37 | -0.16 | 0.03 |
Northwest Africa 5743 | Howardite | 3.4100 | 1.5200 | -0.269 | 0.38 | 0.14 | -0.06 |
Northwest Africa 5743 | Howardite | 3.4100 | 1.5300 | -0.259 | 0.38 | 0.15 | -0.05 |
Northwest Africa 8739 | Eucrite-pmict | 3.4200 | 1.5080 | -0.286 | 0.39 | 0.13 | -0.08 |
Tirhert | Eucrite-unbr | 3.4150 | 1.5240 | -0.268 | 0.39 | 0.14 | -0.06 |
Sayh al Uhaymir 493 | Achondrite-ung | 3.4100 | 1.5400 | -0.249 | 0.38 | 0.16 | -0.04 |
Frontier Mountain 97045 | Eucrite-pmict | 3.4100 | 1.5700 | -0.219 | 0.38 | 0.19 | -0.01 |
Northwest Africa 10019 | Pallasite, ungrouped | 3.4260 | 1.5710 | -0.226 | 0.4 | 0.19 | -0.02 |
Northwest Africa 2739 | Howardite | 3.4390 | 1.5540 | -0.25 | 0.41 | 0.17 | -0.04 |
Northwest Africa 8535 | Angrite | 2.5890 | 1.2970 | -0.062 | -0.44 | -0.09 | 0.14 |
Northwest Africa 10752 | Diogenite | 3.4490 | 1.5400 | -0.269 | 0.42 | 0.16 | -0.06 |
Yamato 981710 | Diogenite | 3.4900 | 1.3800 | -0.451 | 0.46 | -0 | -0.24 |
Northwest Africa 8404 | Diogenite-olivine | 3.4770 | 1.5100 | -0.314 | 0.45 | 0.13 | -0.11 |
Northwest Africa 2775 | Acapulcoite | 3.2500 | 0.9700 | -0.735 | 0.22 | -0.41 | -0.53 |
Berthoud | Eucrite-mmict | 3.4600 | 1.5800 | -0.235 | 0.43 | 0.2 | -0.03 |
Jiddat al Harasis 804 | Eucrite | 3.4730 | 1.5610 | -0.261 | 0.44 | 0.18 | -0.05 |
Northwest Africa 8777 | Achondrite-ung | 2.6590 | 1.0780 | -0.317 | -0.37 | -0.31 | -0.11 |
Northwest Africa 6686 | Howardite | 3.4800 | 1.5800 | -0.246 | 0.45 | 0.2 | -0.04 |