Amino acid compositions in heated carbonaceous chondrites and their compound-specific nitrogen isotopic ratios

Earth, Planets and Space

Table 1 The total carbon, total nitrogen, and isotopic compositions of CI and CO carbonaceous chondrites

Meteorite	Group	TC (wt.%)	TN (wt.%)	C/N (wt ratio)	δ¹³C (‰, vs. PDB)	δ¹⁵N (‰, vs. air)	Reference
Y-980115	CI1	3.8	0.09	41.0	−11.6	−2.8	This study
Orgueil	CI1	3.75	0.15	25.4	−15.6	+46	Kerridge (1985)^b
Ivuna	CI1	3.7	0.19	19.5	−9.4	+52	Kerridge (1985)^b
ALHA77003	CO3	0.33	0.005^a	85.3	−12.7	−10.5^a	This study
Ornans	CO3	0.12	0.0012	100	−16.0	−13	Kerridge (1985)^b

The profiles of CI and CO chondrites for total carbon, total nitrogen, and bulk isotopic compositions. The isotopic compositions of Y-980115 and ALHA77003 were obtained using EA/IRMS in this study
^aData from this study were the average of duplicate analyses (n = 2)
^bData were previously reported by Kerridge (1985) and references therein