Sources of cold seep fluids at the Central American convergent margin

Hensen, Christian, Wallmann, Klaus, Schmidt, Mark, Liebetrau, Volker and Scholz, Florian (2010) Sources of cold seep fluids at the Central American convergent margin [Talk] In: SFB 574 Subduction Workshop, 04.-07.11.2010, Pucon, Chile.

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Abstract

A large number of cold seeps associated with typical seafloor features like mounds, scarps and faults occur along the Central American convergent margin. Similar to pore fluids from other, mostly accretionary convergent
margins, emanating fluids are typically less saline than normal seawater. Most likely, they originate from clay-mineral dehydration processes at elevated temperature and pressure conditions (Hensen et al., 2004; Ranero et al,
2008). Due to the lack of suitable conditions for the presumed processes within the sedimentary sequence of the overriding plate, it has been hypothesized that the fluids may originate from mineral dehydration in subducted sediments. At many sites, however, the geochemical signature
does not reveal clear evidence for a deep origin, such as the lack of freshening, occurrence of shallow biogenic gas or unusually high Li/B ratios. Recently, Tryon et al. (2010) hypothesized that a combination of processes,
specifically the erosion of upper plate serpentinites, ongoing serpentinization, and serpentine mineral phase transitions in the subduction channel are responsible for significant B and Li fractionation. We will discuss how this and other hypotheses on fluid formation and fluid cycling in the forearc comply with the presently available data set obtained through SFB 574 activities.

Document Type: Conference or Workshop Item (Talk)
Keywords: Meeresgeologie
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > SFB 574 > B5
OceanRep > SFB 574
Date Deposited: 07 Dec 2010 12:57
Last Modified: 23 Feb 2012 05:51
URI: http://eprints.uni-kiel.de/id/eprint/10378

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