For samples from Stenlille-1 and Stenlille-4, the TOC [weight % (wt %)] was measured on approximately 50 mg of bulk dry samples using Rock-EVal 6 analysis at the Geological Survey of Canada with a detection limit for TOC of 0.24%. No TOC values below the detection limit were used for assessing Hg/TOC. For Rødby-1 and Norra Albert/Albert-1, sample powders were first treated with 10% HCl to dissolve any carbonates and centrifuged followed by decanting the supernatant. The remnants were washed with ultrapure Milli-Q water five to six times sufficient to neutralize the supernatant. Slurries were then dried for 36 to 48 hours at 50°C, reground in an agate mortar, and returned to the drying oven for several hours at 110°C. Powder (250 to 500 mg) was loaded in ceramic crucibles, and total (organic) carbon was analyzed with an Elementar Vario MAX CNS analyzer using the “Soil40” method in the Department of Geoscience, Aarhus University. Blanks, the sulfadiazine calibration standard, and working standard [Aarhus University (AU) 780523] were run at the beginning and end of each session and after every 10 samples. Blanks were <0.035 wt % C, while the AU standard was reproducible within 0.3% at 1.94 wt % C. For Rødby-1 and Norra Albert/Albert-1, no TOC values below 0.5% were used for assessing Hg/TOC. All TOC data are listed in table S9.

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