Old iodine in fluids venting along the Central American convergent margin

Details Old iodine in fluids venting along the Central American convergent margin Old iodine in fluids venting along the Central American convergent margin

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3422604l&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 22, CiteID L22604

Physics

Geophysics

2

Geochemistry: Geochemical Cycles (0330), Geochemistry: Subduction Zone Processes (3060, 3613, 8170, 8413), Marine Geology And Geophysics: Continental Shelf And Slope Processes (4219), Marine Geology And Geophysics: Gas And Hydrate Systems

Scientific paper

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.

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