Fig. 1: Scanning electron microscope (SEM) images of foraminifera test morphology and respective surface textures prior to and after isotopic exchange experiments.
From: Rapid grain boundary diffusion in foraminifera tests biases paleotemperature records
a Visually pristine methanol-cleaned foraminifera test prior to incubation. b Image of foraminifera test incubated in artificial seawater (ASW) at 90 °C for 54 days with an 18O-enrichment at 1000‰ VSMOW. c Foraminifera test incubated in Na2CO3 buffered Milli-Q at 190 °C for 40 days with a 18O-enrichment at 1000‰ VSMOW. d–f Corresponding high-resolution SEM images of panels a–c, respectively. Note the absence of any visible textural changes in b and c compared with the pristine un-reacted foraminifera test of image a. An extensive set of comparison images between incubated and pristine foraminifera made under the same experimental parameters can be found in the supplementary information of Cisneros-Lazaro et al.12.
