Oxygen Isotope Plots

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Meteoritical Bulletin: Oxygen Isotope Plots

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Change values (separate multiple values with semicolons) - δ¹⁸O: δ¹⁷O: Δ¹⁷O:
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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
3.5700	0.7900	-1.0700	-1.066

Nearest neighbors in MBDB (within 0.5 permil):

Name	Class	δ¹⁸O	δ¹⁷O	Δ¹⁷O: calc	Δ δ¹⁸O	Δ δ¹⁷O	Δ Δ¹⁷O
Northwest Africa 8685	Acapulcoite	3.5360	0.7590	-1.08	-0.03	-0.03	-0.01
Northwest Africa 12437	Acapulcoite/Lodranite	3.6180	0.8460	-1.035	0.05	0.06	0.03
Northwest Africa 6704	Achondrite-ung	3.6130	0.8800	-0.999	0.04	0.09	0.07
Northwest Africa 12437	Acapulcoite/Lodranite	3.6900	0.8920	-1.027	0.12	0.1	0.04
Northwest Africa 4529	Lodranite	3.4670	0.9390	-0.864	-0.1	0.15	0.2
Northwest Africa 10132	Achondrite-ung	3.7890	0.8570	-1.113	0.22	0.07	-0.05
Northwest Africa 7674	Lodranite	3.4880	1.0040	-0.81	-0.08	0.21	0.26
Northwest Africa 10074	Acapulcoite	3.6910	0.9910	-0.928	0.12	0.2	0.14
Northwest Africa 12437	Acapulcoite/Lodranite	3.7690	0.9210	-1.039	0.2	0.13	0.03
Northwest Africa 4448	Lodranite	3.5510	0.5390	-1.308	-0.02	-0.25	-0.24
Northwest Africa 10074	Acapulcoite	3.7240	1.0210	-0.915	0.15	0.23	0.15
Northwest Africa 10132	Achondrite-ung	3.8320	0.8930	-1.1	0.26	0.1	-0.03
Northwest Africa 7674	Lodranite	3.2810	0.7640	-0.942	-0.29	-0.03	0.12
Northwest Africa 8685	Acapulcoite	3.8410	0.8980	-1.099	0.27	0.11	-0.03
Northwest Africa 2775	Acapulcoite	3.2500	0.9700	-0.72	-0.32	0.18	0.35
Northwest Africa 4448	Lodranite	3.4130	0.4420	-1.333	-0.16	-0.35	-0.27
Northwest Africa 4529	Lodranite	3.1890	0.7570	-0.901	-0.38	-0.03	0.17
Northwest Africa 4529	Lodranite	3.1680	0.8290	-0.818	-0.4	0.04	0.25
Northwest Africa 6704	Achondrite-ung	3.9220	1.0150	-1.024	0.35	0.23	0.04
Northwest Africa 5782	Acapulcoite/lodranite	3.2400	0.5300	-1.155	-0.33	-0.26	-0.09
Dhofar 125	Acapulcoite	3.5700	0.3600	-1.496	0	-0.43	-0.43
Northwest Africa 8685	Acapulcoite	3.9320	1.0250	-1.02	0.36	0.24	0.05
Northwest Africa 8287	Acapulcoite	3.2000	0.5000	-1.164	-0.37	-0.29	-0.1
Northwest Africa 2210	CH3	3.9500	1.0700	-0.984	0.38	0.28	0.08
Northwest Africa 6592	Lodranite	3.9800	1.0400	-1.03	0.41	0.25	0.04
Northwest Africa 12455	CR7	3.6370	0.2960	-1.595	0.07	-0.49	-0.53

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