PANGAEA_997438 Stable carbon isotope composition (δ¹³C) of dissolved black carbon in hot-water Soxhlet extracts [MS1.1] of Guaymas Basin deep subsurface sediments Knoke, Melina; Dittmar, Thorsten; Niggemann, Jutta; Wagner, Sasha; Förster, Oliver; Leclerc, Ahlyia J.; Ulber, Ina Ida; Günther, Jana; Simon, Heike; Seidel, Michael Stable carbon isotope composition (δ¹³C) of dissolved black carbon in hot-water Soxhlet extracts [MS1.1] of Guaymas Basin deep subsurface sediments 2026-09-29 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.997438 Investigator Andreas P Teske teske@email.unc.edu Investigator Melina Knoke melina.knoke1@uni-oldenburg.de Investigator Sasha Wagner wagnes3@rpi.edu Earth Science Event label LATITUDE LONGITUDE Date/time start Date/time end Sample comment Sample type DEPTH, sediment/rock DEPTH, water Benzenepentacarboxylic acid, δ13C Benzenepentacarboxylic acid, δ13C, standard deviation Benzenehexacarboxylic acid, δ13C Benzenehexacarboxylic acid, δ13C, standard deviation geoscientificInformation 385-U1547B 385-U1550B 385-U1551B Core drilling Dissolved Black Carbon Dissolved Organic Matter Exp385 Guaymas Basin hydrothermal mobilization IODP NELHA_NEqPIW_2009 NELHA_seasurface_2009 North Equatorial Pacific Intermediate Water porewater Solid‑phase extracted (SPE) of filtered seawater according to Green et al. 2014 High Performance Liquid Chromatograph (HPLC), Thermo Fisher Scientific, Dionex Ultimate 3000; coupled with Isotope ratio mass spectrometer (IRMS), Thermo Fisher Scientific, Delta V Advantage [LC Isolink interface] Joides Resolution 2009-09-24 2019-11-04 Complete 19.7333 27.5069 -156.0667 -111.2197 access rights needed CC-BY-4.0: Creative Commons Attribution 4.0 International (License comes into effect after moratorium ends) English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 40 data points text/tab-separated-values Knoke, Melina; Böning, Philipp; Dittmar, Thorsten; Friebe, Matthias; Gründken, Eleonore; Günther, Jana; Klaproth, Katrin; Ulber, Ina; Simon, Heike; Seidel, Michael (2025): Molecular composition of dissolved organic matter and biogeochemical parameters in porewater of Guaymas Basin (Gulf of California) deep subsurface sediments [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.974052 Knoke, Melina; Dittmar, Thorsten; Niggemann, Jutta; Wagner, Sasha; Förster, Oliver; Leclerc, Ahlyia J.; Ulber, Ina Ida; Günther, Jana; Simon, Heike; Seidel, Michael (2026): BPCA-derived dissolved black carbon concentrations in porewater and hot-water Soxhlet extracts of Guaymas Basin deep subsurface sediments [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.997437 Knoke, Melina; Dittmar, Thorsten; Niggemann, Jutta; Wagner, Sasha; Förster, Oliver; Leclerc, Ahlyia J.; Ulber, Ina Ida; Günther, Jana; Simon, Heike; Seidel, Michael (2026): Temperature-dependent changes in dissolved black carbon during heating of marine and terrestrial dissolved organic matter reference materials [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.997430 Knoke, Melina; Dittmar, Thorsten; Günther, Jana; Böning, Philipp; Teske, Andreas P; Seidel, Michael (2025): Hydrothermal mobilization and molecular transformations of dissolved organic matter from deep subsurface sediments. Geochimica et Cosmochimica Acta, S0016703725003084, https://doi.org/10.1016/j.gca.2025.06.005 Wagner, Sasha; Brandes, Jay; Goranov, Aleksandar I; Drake, Travis W; Spencer, Robert G M; Stubbins, Aron (2017): Online quantification and compound‐specific stable isotopic analysis of black carbon in environmental matrices via liquid chromatography‐isotope ratio mass spectrometry. Limnology and Oceanography-Methods, 15(12), 995-1006, https://doi.org/10.1002/lom3.10219 Wiedemeier, Daniel B; Lang, Susan Q; Gierga, Merle; Abiven, Samuel; Bernasconi, Stefano M; Früh-Green, Gretchen L; Hajdas, Irka; Hanke, Ulrich M; Hilf, Michael D; McIntyre, Cameron P; Scheider, Maximilian P W; Smittenberg, Rienk H; Wacker, Lukas; Wiesenberg, Guido L B; Schmidt, Michael W I (2016): Characterization, Quantification and Compound-specific Isotopic Analysis of Pyrogenic Carbon Using Benzene Polycarboxylic Acids (BPCA). Journal of Visualized Experiments, (111), 53922, https://doi.org/10.3791/53922

Dissolved black carbon (DBC) is a condensed aromatic fraction of dissolved organic matter (DOM) and an important component of the marine carbon cycle. Hydrothermal systems have been suggested as a potential source of DBC to the deep ocean, but the mobilization and origin of DBC in organic-rich hydrothermal sediments remain poorly constrained. This dataset contains compound-specific stable carbon isotope compositions (δ13C) of benzene pentacarboxylic acid (B5CA), a BPCA oxidation product used to characterize dissolved black carbon (DBC), from hot-water Soxhlet extracts of dissolved organic matter (DOM) of deep subsurface sediments collected during IODP Expedition 385 in the Guaymas Basin (Gulf of California). DBC was characterized using benzene polycarboxylic acids (BPCAs). Benzene pentacarboxylic acid (B5CA) was isolated chromatographically for compound-specific stable carbon isotope analysis. The δ13C composition of B5CA was determined by high-performance liquid chromatography coupled to isotope ratio mass spectrometry (HPLC-IRMS) and is reported in per mil (‰) relative to Vienna Pee Dee Belemnite (VPDB). Only δ13C values of B5CA are reported because B6CA peaks could not be sufficiently separated from the analytical background for unambiguous carbon isotope measurements. The dataset contains B5CA δ13C values and the associated analytical variability. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.997438"!

http://en.wikipedia.org/wiki/ISO_6709 LATITUDE http://en.wikipedia.org/wiki/ISO_6709 LONGITUDE http://en.wikipedia.org/wiki/ISO_8601 Date/time end http://en.wikipedia.org/wiki/ISO_8601 Date/time start https://doi.org/10.1002/lom3.10219 Online quantification and compound‐specific stable isotopic analysis of black carbon in environmental matrices via liquid chromatography‐isotope ratio mass spectrometry https://doi.org/10.1016/j.gca.2025.06.005 Hydrothermal mobilization and molecular transformations of dissolved organic matter from deep subsurface sediments https://doi.org/10.1016/j.marchem.2014.01.012 Solid‑phase extracted (SPE) of filtered seawater according to Green et al. 2014 https://doi.org/10.3791/53922 Characterization, Quantification and Compound-specific Isotopic Analysis of Pyrogenic Carbon Using Benzene Polycarboxylic Acids (BPCA) https://doi.pangaea.de/10.1594/PANGAEA.974052 Molecular composition of dissolved organic matter and biogeochemical parameters in porewater of Guaymas Basin (Gulf of California) deep subsurface sediments https://doi.pangaea.de/10.1594/PANGAEA.997430 Temperature-dependent changes in dissolved black carbon during heating of marine and terrestrial dissolved organic matter reference materials https://doi.pangaea.de/10.1594/PANGAEA.997437 BPCA-derived dissolved black carbon concentrations in porewater and hot-water Soxhlet extracts of Guaymas Basin deep subsurface sediments https://www-odp.tamu.edu:443/resolutn.html Joides Resolution DIF 9.4 2026-09-29 2026-09-29