Old iodine in fluids venting along the central American convergent margin.

Lu, Z., Hensen, Christian, Fehn, U. and Wallmann, Klaus (2007) Old iodine in fluids venting along the central American convergent margin. Open Access Geophysical Research Letters, 34 (L22604). DOI 10.1029/2007GL031864.

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Abstract

Focused fluid expulsion at cold vents is a common feature of subduction zones, serving as an important backflux of water and volatile elements to the oceanic reservoir. The strong enrichment of iodine in fluids collected from mounds along the Central American convergent Margin allowed the determination of 129I/I ratios for age calculations in order to determine potential source formations in this active, erosional margin. The majority of the determined iodine ages are between 40 and 20 Ma. Because these ages are older than the age of host sediments and underthrust sediments on the oceanic plate (<18 Ma), a major contribution of iodine must come from old, organic rich sources in the upper plate. Both the iodine concentrations and ages determined for the mounds in this study are similar to reported values for hydrate fields at accretionary margins, indicating that iodine and associated organic carbon cycling at both erosional and accretionary margins may occur on similar time scales.

Document Type: Article
Research affiliation: OceanRep > SFB 574 > B6
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > SFB 574
OceanRep > SFB 574 > B5
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2007GL031864
ISSN: 0094-8276
Projects: Future Ocean, SFB574
Contribution Number:
ProjectNumber
SFB 574131
Expeditions/Models/Experiments:
Date Deposited: 03 Dec 2008 16:50
Last Modified: 14 Feb 2018 14:02
URI: http://oceanrep.geomar.de/id/eprint/787

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