Table 4.

The estimated initial Δ¹⁷O and δD values of water in the various chondrite groups. The Δ¹⁷O values are the highest reported for secondary minerals in any member of the group, but are still probably lower limits as it is likely that there was some isotopic exchange with anhydrous minerals prior to formation of the secondary minerals. The δD values are estimated after subtraction of D-rich organic matter from bulk chondrite compositions, except for the R chondrites that is a direct measurement of hydrated silicates.

	Δ17Oa (‰)	δDb (‰)	D/Hb
R	3.5	3660±75	7.26±0.13×10−4
OC	4.8±1.7	1002±207	3.1±0.3×10−4
CV	−0.4±0.9
CO	−2
CM	1.3	−427±45	8.7±0.4×10−5
CI	1.7	−481±107	8.1±1.7×10−5
Tagish Lake	2	−550±130	7.0±2.0×10−5
CR		${96}_{-65}^{+110}$	1.7±0.2×10−4

^(a)R - Greenwood et al. (2000); OC - Choi et al. (1998); Doyle et al. (2015); CV - Choi et al. (1997); Choi et al. (2000); Doyle et al. (2015); CO – Choi et al. (2008); CM - Rowe et al. (1994); Airieau et al. (2005); CI - Rowe et al. (1994); Tagish Lake - Leshin et al. (2001).

^(b)R - McCanta et al. (2008); others - Alexander et al. (2012).