Fig. 3: The influence of subducted carbon on MORB mantle Ī“13C signature.
From: The carbon isotopic signature of the upper mantle is heterogeneous
Nb/U versus Ī“13C showing modelled mixing lines between the ānormalā MORB mantle and three possible subduction-fluid metasomatized mantles endmembers. Error bars on the SWIR average (large circle symbol) show 95% confidence intervals based on 31 analyses for Nb/U from ref. 23 and 9 analyses for Ī“13C, this study. Error bars on individual analyses are one standard deviation analytical errors and their propagation for the Nb/U ratio. Horizontal dashes show the 25, 50 and 75% of mixing along each mixing lines. The SWIR melt mantle Ī“13C can be explained by ~80% mixing between the ānormalā MORB mantle and a metasomatized mantles component with a Ī“13Cā=āā10ā° signature.
