Figure 10.

C- and N-isotopic ratios, expressed as δ-values, of organic grains that are anomalous in one or both of these elements from DOM 08006 (present study), QUE 99177 and MET 00426 (Floss and Stadermann, 2009b), and ALH 77307 (Bose et al., 2012). Small grey circles are DOM 08006 data that do not meet our criteria for being considered anomalous (see text). F04 indicates an anomalous grain found in an IDP (Floss et al., 2004), B06 indicates an isotopic hotspot in insoluble organic matter from a CR chondrite (Busemann et al., 2006), and D10 indicates a carbonaceous nanoglobule from comet Wild-2 (De Gregorio et al., 2010). The dotted lines indicate the terrestrial values. Dashed ellipse indicates population of ¹⁵N-enriched, ¹³C-depleted organic grains seen in several other extraterrestrial samples, but not DOM 08006. Isotopic images of grain A7_60 are shown in Figure 11.