Fig. 3: Plot of the Δ‘56Fe versus δ57Fe of investigated I-type cosmic spherules (ICS). | Communications Earth & Environment

Fig. 3: Plot of the Δ‘56Fe versus δ57Fe of investigated I-type cosmic spherules (ICS).

From: Traces of the oxygen isotope composition of ancient air in fossilized cosmic dust

Fig. 3

Modern Antarctic I-type cosmic spherules from the literature11 are presented as reference (gray triangles). The composition of chondritic metal26 is depicted as the presumed precursor of I-type cosmic spherules. The slope of the regression line described by modern specimens (gray solid line) can be explained by Graham’s law fractionation for Rayleigh-type evaporation of Fe (dashed line) and FeO (dotted line) as described in detail by Fischer et al.11. Error bars are 2SD.

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