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	Comment
6.6000	3.0100	-0.4200	-0.422

Nearest neighbors in MBDB (within 0.5 permil):

Name	Class	δ¹⁸O	δ¹⁷O	Δ¹⁷O: calc	Δ δ¹⁸O	Δ δ¹⁷O	Δ Δ¹⁷O
Dhofar 732	Achondrite-ung	6.6400	2.7700	-0.683	0.04	-0.24	-0.26
Ooldea 014	Achondrite-prim-ung	6.5670	2.7660	-0.649	-0.03	-0.24	-0.23
Northwest Africa 11729	Eucrite-an	6.3120	3.0620	-0.22	-0.29	0.05	0.2
Kalahari 008	Lunar (anorth)	6.5200	3.3200	-0.07	-0.08	0.31	0.35
Northwest Africa 4415	EL6	6.3880	3.3400	0.018	-0.21	0.33	0.44
Northwest Africa 4416	EL6	6.3850	3.3420	0.022	-0.22	0.33	0.44
Northwest Africa 12821	EL3	6.4020	3.3670	0.038	-0.2	0.36	0.46
Northwest Africa 5517	Achondrite-ung	6.8070	2.6510	-0.889	0.21	-0.36	-0.47
Northwest Africa 11444	Lunar (melt breccia)	6.2800	3.2800	0.014	-0.32	0.27	0.44
Northwest Africa 10989	Lunar	6.5100	3.4200	0.035	-0.09	0.41	0.46
Northwest Africa 10085	K4	6.8730	2.6740	-0.9	0.27	-0.34	-0.48
Aridal 010	Brachinite	6.1700	3.1000	-0.108	-0.43	0.09	0.31
Northwest Africa 5517	Achondrite-ung	6.6180	2.5700	-0.871	0.02	-0.44	-0.45
Dhofar 1436	Lunar	6.2440	3.2860	0.039	-0.36	0.28	0.46
Dar al Gani 1031	EL4	6.6200	3.4700	0.028	0.02	0.46	0.45
Galb Inal	Lunar	6.1980	3.2380	0.015	-0.4	0.23	0.44
Lynch 002	Lunar	6.6760	3.4700	-0.002	0.08	0.46	0.42
Northwest Africa 11558	Achondrite-ung	6.9900	2.7160	-0.919	0.39	-0.29	-0.5

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