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Oxygen isotope composition of differentiated achondrites. Data for angrites and HEDs from Greenwood et al. (2005). Data for Martian meteorites from Franchi et al. (1999). EFL: eucrite fractionation line (Greenwood et al., 2005), AFL: angrite fractionation line (Greenwood et al., 2005), MFL: Martian fractionation line (Franchi et al., 1999), TFL: terrestrial fractionation line. M: average value of Martian meteorite analyses from Franchi et al. (1999). E: bulk terrestrial mantle (Mattey et al., 1994). Open squares: HEDs, open triangles: angrites, open circles: Martian meteorites. Δ17O is linearized using the format of Miller (2002): Δ17O = 1000 ln (1+ (δ17O/1000)) – λ1000 ln (1+ ( δ18O/1000)) where λ = 0.5247. |
δ18O | δ17O | Δ17O: given | Δ17O: Miller (2002) | Comment |
---|---|---|---|---|
-0.5550 | -3.5570 | -3.2640 | -3.272 | |
-0.6240 | -3.5690 | -3.2400 | -3.248 | |
-0.7920 | -3.6740 | -3.2560 | -3.265 | |
-0.8480 | -3.7570 | -3.3090 | -3.319 | |
-0.8730 | -3.7790 | -3.3180 | -3.327 | |
-0.8930 | -3.8180 | -3.3460 | -3.356 | |
-1.1620 | -3.8840 | -3.2700 | -3.281 | |
-1.2120 | -3.9500 | -3.3100 | -3.321 | |
-1.2060 | -3.9680 | -3.3310 | -3.342 |
Name | Class | δ18O | δ17O | Δ17O: calc | Δ δ18O | Δ δ17O | Δ Δ17O |
---|---|---|---|---|---|---|---|
Northwest Africa 10859 | Achondrite-ung | -0.9430 | -3.8170 | -3.329 | -0.04 | -0.04 | -0.03 |
Northwest Africa 10859 | Achondrite-ung | -0.8350 | -3.7020 | -3.27 | 0.07 | 0.07 | 0.03 |
Northwest Africa 2043 | CK3 | -0.8400 | -3.8800 | -3.446 | 0.07 | -0.11 | -0.14 |
Northwest Africa 10859 | Achondrite-ung | -0.7370 | -3.6340 | -3.253 | 0.17 | 0.14 | 0.05 |
Northwest Africa 11961 | C3-ung | -0.7480 | -3.9350 | -3.55 | 0.16 | -0.16 | -0.25 |
Northwest Africa 2043 | CK3 | -0.9700 | -4.0800 | -3.579 | -0.06 | -0.31 | -0.28 |
Lewis Cliff 85311 | CM2-an | -1.2300 | -3.8700 | -3.231 | -0.32 | -0.1 | 0.07 |
Northwest Africa 10859 | Achondrite-ung | -0.5670 | -3.7060 | -3.415 | 0.34 | 0.07 | -0.11 |