Organic, Gas, and Element Geochemistry of Hydrothermal Fluids of the Newly Discovered Extensive Hydrothermal Area in the Wallis and Futuna Region (SW Pacific)

Type Article
Date 2018
Language English
Author(s) Konn Cecile1, Donval Jean-Pierre1, Guyader VivienORCID1, Roussel ErwanORCID2, Fourre E.3, Jean-Baptiste P.3, Pelleter EwanORCID1, Charlou Jean-Luc1, Fouquet Yves1
Affiliation(s) 1 : IFREMER, Lab Cycles Geochim & Ressources, CS10070, F-29280 Plouzane, France.
2 : IFREMER, Lab Microbiol Environm Extremes, F-29280 Plouzane, France.
3 : CNRS, UMR 8212, CEA, LSCE,UVSQ, F-91191 Gif Sur Yvette, France.
Source Geofluids (1468-8115) (Wiley-hindawi), 2018 , N. 7692839 , P. 25p.
DOI 10.1155/2018/7692839
WOS© Times Cited 1
Abstract

Two newly discovered hydrothermal vent fields of the Wallis and Futuna region, Kulo Lasi and Fatu Kapa, were sampled for fluid geochemistry. A great geochemical diversity was observed and assigned to the diversity of lithologies as well as the occurrence of various processes. Kulo Lasi fluids likely formed by interaction with fresh volcanic rocks, phase separation, and mixing with magmatic fluid. Conversely, the geochemistry of the Fatu Kapa fluids would be mostly due to water/felsic lavas reactions. In terms of organic geochemistry, fluids from both fields were found to be enriched in formate, acetate, and semivolatile organic compounds (SVOCs): n-alkanes, n-fatty acids, and polyaromatic hydrocarbons (PAHs). Concentrations of SVOCs reached a few ppb at most. The distribution patterns of SVOCs indicated that several processes and sources, at once of biogenic, thermogenic, and abiogenic types, likely controlled organic geochemistry. Although the contribution of each process remains unknown, the mere presence of organics at the μM level has strong implications for metal dispersion (cycles), deposition (ore-forming), and bioavailability (ecosystems), especially as our fluxes estimations suggest that back-arc hosted vent fields could contribute as much as MOR to the global ocean heat and mass budget.

Full Text
File Pages Size Access
Publisher's official version 25 6 MB Open access
Supplementary Materials 10 1 MB Open access
Supplementary 2. S8: example of a postprocessed video sequence using the Typhoon ... 8 MB Open access
Supplementary 3. S9: example of a postprocessed video sequence using the Typhoon algorithm to estimate displacements (instantaneous, left panel; averaged on... 8 MB Open access
Supplementary 4. S10: example of a postprocessed video sequence using the Typhoon algorithm to estimate displacements (instantaneous, left panel; averaged on... 13 MB Open access
Corrigendum 2 1 MB Open access
Top of the page

How to cite 

Konn Cecile, Donval Jean-Pierre, Guyader Vivien, Roussel Erwan, Fourre E., Jean-Baptiste P., Pelleter Ewan, Charlou Jean-Luc, Fouquet Yves (2018). Organic, Gas, and Element Geochemistry of Hydrothermal Fluids of the Newly Discovered Extensive Hydrothermal Area in the Wallis and Futuna Region (SW Pacific). Geofluids, (7692839), 25p. Publisher's official version : https://doi.org/10.1155/2018/7692839 , Open Access version : https://archimer.ifremer.fr/doc/00431/54245/