Oxygen Isotope Plots

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Meteoritical Bulletin: Oxygen Isotope Plots

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).

References:

Clayton R. N. and Mayeda T. K. (1999) Oxygen isotope studies of carbonaceous chondrites. Geochim. Cosmochim. Acta 63, 2089-2017 (link)
Clayton R. N. and Mayeda T. K. (1999) Oxygen isotope studies of carbonaceous chondrites. Geochim. Cosmochim. Acta 63, 2089-2017 (link)
Clayton R. N., Onuma N., Grossman L. and Mayeda T. K. (1977) Distribution of the pre-solar component in Allende and other carbonaceous chondrites. Earth Planet. Sci. Lett. 34, 209-224 (link)
Franchi I. A., Wright I. P., Sexton A. S. and Pillinger C. T. (1999) The oxygen-isotopic composition of Earth and Mars. Meteorit. Planet. Sci. 34, 657-661. (link)
Greenwood R.C., Franchi I.A., Gibson J.M. and Benedix G.K. (2012) Oxygen isotope variation in primitive achondrites: The influence of primordial, asteroidal and terrestrial processes. Geochim. Cosmochim. Acta 94, 146-163. (link)
Greenwood R.C., Franchi I.A., Gibson J.M. and Benedix G.K. (2012) Oxygen isotope variation in primitive achondrites: The influence of primordial, asteroidal and terrestrial processes. Geochim. Cosmochim. Acta 94, 146-163. (link)
Young E. D. and Russell S. S. (1998) Oxygen reservoirs in the early solar nebula inferred from an Allende CAI. Science 282, 452-455 (link)

Data summary:

δ¹⁸O	δ¹⁷O	Δ¹⁷O: given	Δ¹⁷O: linear
4.6620	1.8800	-0.5820	-0.544
5.1180	2.1200	-0.5820	-0.541
5.5830	2.3450	-0.6030	-0.558

Nearest neighbors in MBDB (within 0.5 permil):

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 10851	Winonaite	5.2420	2.2240	-0.502	0.12	0.11	0.05
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
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
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 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 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
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 2656	Acapulcoite	5.0500	1.7100	-0.916	-0.07	-0.41	-0.37
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
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
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
Northwest Africa 10497	Brachinite	4.6700	2.2200	-0.208	-0.45	0.11	0.34
Northwest Africa 5400	Achondrite-ung	4.8800	2.5250	-0.013	-0.24	0.41	0.54
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

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