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
4.1250	1.1440	-1.0250	-1.001
4.0150	1.2020	-0.9100	-0.886

Nearest neighbors in MBDB (within 0.5 permil):

Name	Class	δ¹⁸O	δ¹⁷O	Δ¹⁷O: calc	Δ δ¹⁸O	Δ δ¹⁷O	Δ Δ¹⁷O
Yabrin 003	Acapulcoite	4.0400	1.1300	-0.971	-0.03	-0.04	-0.03
Northwest Africa 10074	Acapulcoite	3.9490	1.1760	-0.877	-0.12	0	0.07
Northwest Africa 2210	CH3	4.1100	1.0500	-1.087	0.04	-0.12	-0.14
Northwest Africa 2210	CH3	3.9500	1.0700	-0.984	-0.12	-0.1	-0.04
Northwest Africa 6592	Lodranite	3.9800	1.0400	-1.03	-0.09	-0.13	-0.09
Northwest Africa 8685	Acapulcoite	3.9320	1.0250	-1.02	-0.14	-0.15	-0.08
Northwest Africa 6704	Achondrite-ung	3.9220	1.0150	-1.024	-0.15	-0.16	-0.08
Northwest Africa 6693	Achondrite-ung	4.3200	1.1900	-1.056	0.25	0.02	-0.11
El Médano 096	Acapulcoite	4.3000	1.4100	-0.826	0.23	0.24	0.12
Northwest Africa 8685	Acapulcoite	3.8410	0.8980	-1.099	-0.23	-0.28	-0.16
Northwest Africa 10132	Achondrite-ung	3.8320	0.8930	-1.1	-0.24	-0.28	-0.16
Northwest Africa 10074	Acapulcoite	3.7240	1.0210	-0.915	-0.35	-0.15	0.03
Northwest Africa 12437	Acapulcoite/Lodranite	3.7690	0.9210	-1.039	-0.3	-0.25	-0.1
Northwest Africa 1982	Mesosiderite-C	3.7800	1.4700	-0.496	-0.29	0.3	0.45
Northwest Africa 10074	Acapulcoite	3.6910	0.9910	-0.928	-0.38	-0.18	0.02
Northwest Africa 10132	Achondrite-ung	3.7890	0.8570	-1.113	-0.28	-0.32	-0.17
Northwest Africa 4272	Diogenite	3.7800	1.5000	-0.466	-0.29	0.33	0.48
Northwest Africa 12437	Acapulcoite/Lodranite	3.6900	0.8920	-1.027	-0.38	-0.28	-0.08
Northwest Africa 11916	Achondrite-ung	3.6800	1.4700	-0.444	-0.39	0.3	0.5
Northwest Africa 10132	Achondrite-ung	4.5570	1.2730	-1.097	0.49	0.1	-0.15

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