Bromine and iodine in Peru margin sediments and pore fluids; implications for fluid origins

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doi: 10.1016/0016-7037(93)90489-J
Author(s): Martin, Jonathan B.; Gieskes, Joris M.; Torres, Marta; Kastner, Miriam
Author Affiliation(s): Primary:
Scripps Institution of Oceanography, La Jolla, CA, United States
Other:
Ocean Drilling Program, United States
Volume Title: Geochimica et Cosmochimica Acta
Source: Geochimica et Cosmochimica Acta, 57(18), p.4377-4389. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037 CODEN: GCACAK
Note: In English. 63 refs.; illus. incl. 6 tables, geol. sketch map
Summary: At this margin two distinct pore fluid regimes are identified from differences in their Cl- concentrations. The slope pore fluids have low Cl- concentrations but raised Br- and I- due to biogenic production. The shelf pore fluids show raised Cl- and Br- due to diffusive mixing with an evaporitic brine. Slope sediment organic matter is enriched in I- from oxidation-reduction at the oxygenated sediment-water interface. Increases in dissolved I- and the enrichment in I- relative to NH4 and Br correlate with sedimentation rates. Possible causes of decreases in Cl are discussed. The shelf high-Cl- fluid, however, formed by mixing with brine modified by halite dissolution, and this dense brine appears to flow > 500 km through the sediments.
Year of Publication: 1993
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; Bromine; Compression tectonics; Continental margin; Continental slope; East Pacific; Eh; Fluid phase; Halogens; Iodine; Marine sediments; Organic compounds; Organic materials; Pacific Ocean; Peru; Peru-Chile Trench; Plate convergence; Pore water; Sediments; South America; Tectonics
Record ID: 1993046081
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom

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