Fig. 2: Biomarker indicators of heating in the JFAST core.
Fraction remaining (i.e., not reacted) of (a) C37 total, (b) \(U_{37}^{k{\prime}}\), (c) CPI, and (d) ADI are shown for samples in the plate boundary region. Box plots indicate the median and quartiles of the fraction remaining value (relative to the range of biomarker values measured in the corresponding sedimentary unit at Site 436) while minimum and maximum values are indicated by the whiskers, and outliers by dots. e Sample locations are shown as stars, colored red when biomarker anomalies indicate heating. Gray shading indicates JFAST core recovery while white gaps indicate missing section. Stratigraphy is shown with previously observed faults indicated with arrows17,18,19, those with biomarker anomalies discussed in the main text in red, and those lacking an anomaly, in black. Light gray bars crossing between plots show the depths at which biomarker anomalies are observed. Sample PP948, represented by hollow symbols in a and e, had alkenone concentrations below the quantification limit and thus, the magnitude of the heating anomaly is poorly constrained.
