Sediment cores were obtained by Piston coring (using commercial PVC core liners) onboard R/V El Puma. The sediment cores were recovered during the RV El Puma cruise in October 2014. Core PO3 is from the northwestern ridge flanks [27\u00b0N 37.6759/111\u00b0W 52.5740; 1611 m depth], P10 is from ca. 1 mile west of Ringvent [27\u00b0N 30.5193/111\u00b0W 42.1722 W; 1731 m depth], core P11 is from the center of Ringvent [27\u00b0N 30.5090/111\u00b0W 40.6860, 1749 m], core P12 is from the upper Sonora Margin [27\u00b0N 52.1129/111\u00b0W 41.5902, 667 m], and core P13 is from the southeastern ridge flank of Guaymas Basin [27\u00b0N 12.4470/111\u00b0W 13.7735, 1859m]. Sedimentation rates were not inferred from cores P5 and P6 due to distortions by slumping. Measurements were made on bulk sediment without authigenic carbonate phases, and thus the majority of carbon in the samples is organic carbon produced by primary producers.
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Samples selected for radiocarbon analyses were freeze-dried, homogenized, and acidified to remove CaCO\u2083, allowing for the analysis of remaining organic matter, and preventing the distortion of radiocarbon ages by methane-derived carbonates. Acidification was performed on ~200 mg of sample, which was treated with ~5ml buffered pH 5 acetic acid solution for ~24 hours to dissolve the CaCO\u2083. Samples were then rinsed with Milli-Q water 6 to 8 times to remove the acetic acid. Acidified samples were then freeze-dried again, re-homogenized and stored for \u00b9\u2074C and \u00b9\u00b3C analysis. Radiocarbon dating was performed at Lawrence Livermore National Laboratory Center for Accelerator Mass Spectrometry, and a reservoir age of 406 years was used before conversion to calendar years using CALIB REV7.1.0. (Stuiver et al. 2019). The d\u00b9\u00b3C values of all the acidified samples used for radiocarbon analyses were approximately -20 to -22\u2030, as expected from marine (primary producers) derived organic matter.
Radiocarbon [14C] ages of sedimentary organic matter and sedimentation rates for Guaymas Basin and Sonora Margin sediments collected from R/V El Puma (the Pacific Coast research vessel of the Autonomous University of Mexico) from October 14, 2014 to October 27, 2014.
Data notes:
\nThe sedimentation Rate (Sed_Rate) is based on using the youngest and oldest samples to obtain an average for the dated part of the core.
\n** = outlier
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BCO-DMO Processing:
\n- copied values from merged cells into each row;
\n- modified column headers (replaced spaces with underscores, renamed standard deviation columns for clarity);
\n- separated original C14_age column into two: one for the value and one for the stdev.