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Thermally altered marine dissolved organic matter in hydrothermal fluids
Max Planck Inst, HGF MPG Grp Deep Sea Ecol & Technol, Celsiustr 1, D-28359 Bremen, Germany.;Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, Handelshafen 12, D-27570 Bremerhaven, Germany.;Carl von Ossietzky Univ Oldenburg, Inst Chem & Biol Marine Environm ICBM, Res Grp Marine Geochem, ICBM MPI Bridging Grp, D-26111 Oldenburg, Germany..
Univ Georgia, Dept Marine Sci, Skidaway Inst Oceanog, Savannah, GA 31411 USA..
Univ Appl Sci, Hsch Osnabruck, Lab Proc Engn, D-49076 Osnabruck, Germany..
Jacobs Univ Bremen, Dept Phys & Earth Sci, Campus Ring, D-28759 Bremen, Germany..
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2017 (English)In: Organic Geochemistry, ISSN 0146-6380, E-ISSN 1873-5290, Vol. 110, 73-86 p.Article in journal (Refereed) Published
Abstract [en]

Hydrothermal vent fluids contain thermally modified dissolved organic matter (DOM) originally entrained from sediments and seawater. We hypothesized that in hydrothermal systems DOM molecular composition is modulated by (i) fluid contribution, (ii) thermal decomposition and pH, and (iii) aspects particular to the vent system. Hence, solid phase extracted (SPE) DOM samples collected along the Mid-Atlantic Ridge (MAR) were molecularly characterized via 15 Tesla Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). The molecular character of an oceanic DOM sample was also determined before and after thermal (300 degrees C) decomposition at acidic and neutral pH. Multivariate statistical analysis indicated that DOM composition was strongly influenced by fluid contribution (Mg2+ concentration between 12 and 54 mM), which correlated positively with measured temperature (between 8 and 375 degrees C). In comparison, pH of the fluids (between 2.5 and 6.9) had a minor influence. Seafloor pressure, used as a theoretical maximum fluid temperature at the seafloor, separated the fluids collected at Menez Gwen from deeper locations, due to the higher abundance of peptide, carboxyl-rich alicyclic (CRAM) and aromatic molecular formulae at Menez Gwen. Compared with seawater DOM, thermally decomposed DOM had on average lower molecular mass, lower O/C ratios, fewer double bond equivalents, and fewer CRAM formulae but higher aromaticity - the same molecular features displayed by MAR hydrothermal fluids. The study provides evidence that thermal reworking plays a major role in shaping DOM mixtures from hydrothermal fluids along the MAR, which partly represent thermally reworked marine DOM that survived hydrothermal circulation.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2017. Vol. 110, 73-86 p.
Keyword [en]
Hydrothermal system, Dissolved organic matter, Thermal decomposition, Refractory organic matter, Fourier transform ion cyclotron mass, spectrometry
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-331216DOI: 10.1016/j.orggeochem.2017.05.003ISI: 000405995000010OAI: oai:DiVA.org:uu-331216DiVA: diva2:1150211
Available from: 2017-10-18 Created: 2017-10-18 Last updated: 2017-10-18Bibliographically approved

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