PANGAEA_997437 BPCA-derived dissolved black carbon concentrations in porewater and hot-water Soxhlet extracts 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 BPCA-derived dissolved black carbon concentrations in porewater and hot-water Soxhlet extracts of Guaymas Basin deep subsurface sediments 2026-09-29 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.997437 Investigator Andreas P Teske teske@email.unc.edu Investigator Melina Knoke melina.knoke1@uni-oldenburg.de Earth Science Event label LATITUDE LONGITUDE Date/time start Date/time end Sample code/label Replicate Sample type DEPTH, sediment/rock Temperature, in rock/sediment Benzenepentacarboxylic acid Benzenehexacarboxylic acid Benzenepentacarboxylic acid/Benzenehexacarboxylic acid ratio Black carbon, dissolved Black carbon, dissolved/carbon, organic, dissolved ratio Black carbon, dissolved per unit mass total organic carbon geoscientificInformation 385-U1545A 385-U1545B 385-U1547B 385-U1550B 385-U1551B AT37-06_4864 AT37-06_4865 Core drilling Dissolved Black Carbon Dissolved Organic Matter Exp385 Guaymas Basin hydrothermal mobilization IODP porewater Submersible Alvin DSDP/ODP/IODP sample designation Benzene polycarboxylic acid method (BPCA); measured with Ultra Performance Liquid Chromatograph (UPLC), Waters Corporation, ACQUITY Calculated Joides Resolution 2016-12-15 2019-11-04 Complete 27.2063866667 27.6372083333 -111.88900999999998 -111.21973500000001 -2.0 m (DEPTH, sediment/rock) 485.94 m (DEPTH, sediment/rock) 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 1519 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): Stable carbon isotope composition (δ¹³C) of dissolved black carbon in hot-water Soxhlet extracts [MS1.1] of Guaymas Basin deep subsurface sediments [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.997438 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 Dittmar, Thorsten (2008): The molecular level determination of black carbon in marine dissolved organic matter. Organic Geochemistry, 39(4), 396-407, https://doi.org/10.1016/j.orggeochem.2008.01.015 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 Stubbins, Aron; Spencer, Robert G M; Mann, Paul James; Holmes, R Max; McClelland, James W; Niggemann, Jutta; Dittmar, Thorsten (2015): Utilizing colored dissolved organic matter to derive dissolved black carbon export by arctic rivers. Frontiers in Earth Science, 3, https://doi.org/10.3389/feart.2015.00063 Teske, Andreas P; Lizarralde, Daniel; Höfig, Tobias Walter (2021): Guaymas Basin Tectonics and Biosphere. Proceedings of the International Ocean Discovery Program, International Ocean Discovery Program, 385, https://doi.org/10.14379/iodp.proc.385.2021

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 benzene polycarboxylic acid (BPCA)-derived dissolved black carbon (DBC) concentrations from porewater and water-extractable hot-water Soxhlet extracts of deep subsurface sediments collected during IODP Expedition 385 in the Guaymas Basin (Gulf of California). Sample handling and the preparation and characterization of porewater and hot-water Soxhlet extracts have been described previously (Teske et al., 2021; Knoke et al., 2025). DBC was quantified using the benzene polycarboxylic acid method. Methanolic SPE-DOM extracts were oxidized with nitric acid, and the resulting BPCAs were quantified by ultra-performance liquid chromatography (UPLC). Benzene pentacarboxylic acid (B5CA) and benzene hexacarboxylic acid (B6CA) were considered for DBC quantification, and DBC concentrations were calculated according to Stubbins et al. (2015). The dataset includes B5CA and B6CA concentrations, B6CA/B5CA ratios, calculated DBC concentrations, and operationally defined hot-water-extractable DBC normalized to sediment total organic carbon content. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.997437"!

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/10.1016/j.gca.2025.06.005 Hydrothermal mobilization and molecular transformations of dissolved organic matter from deep subsurface sediments https://doi.org/10.1016/j.orggeochem.2008.01.015 The molecular level determination of black carbon in marine dissolved organic matter https://doi.org/10.14379/iodp.proc.385.2021 Guaymas Basin Tectonics and Biosphere https://doi.org/10.3389/feart.2015.00063 Utilizing colored dissolved organic matter to derive dissolved black carbon export by arctic rivers 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.997438 Stable carbon isotope composition (δ¹³C) of dissolved black carbon in hot-water Soxhlet extracts [MS1.1] of Guaymas Basin deep subsurface sediments https://hdl.handle.net/10013/epic.27914.d001 DSDP/ODP/IODP sample designation https://www-odp.tamu.edu:443/resolutn.html Joides Resolution DIF 9.4 2026-09-29 2026-09-29