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Compositions and sources of fluids in sediments of the Peru subduction zone

Journal Article · · Journal of Geophysical Research; (United States)
 [1]; ;  [2]
  1. Cambridge Univ. (England)
  2. Scripps Institution of Oceanography, La Jolla, CA (United States)
Sediments of the middle-to-lower slope regions of the Peru continental margin drilled during Ocean Drilling Program (ODP) leg 112 contain interstitial waters with chloride concentrations as low as 454 mM Cl{sup {minus}}, equivalent to {approximately} 20% dilution of seawater with fresh water. Strontium isotope data suggest that two separate fluid regimes are present: a northerly one in which fluids contain more radiogenic Sr than seawater ({sup 87}Sr/{sup 86}Sr up to 0.70996), possible originating from continental crust, and a southerly regime where fluids contain Sr less radiogenic than seawater ({sup 87}Sr/{sup 86}Sr down to 0.70722), and which are also enriched in Ca{sup 2+} and depleted in Mg{sup 2+} and {delta}P{sup 18}O, that appear to have interacted with oceanic basement. O, C, and He isotopic data support these interpretations.
OSTI ID:
5009512
Journal Information:
Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 95:B6; ISSN 0148-0227; ISSN JGREA
Country of Publication:
United States
Language:
English

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