Compositions and sources of fluids in sediments of the Peru Subduction Zone

Authors:
  • HEHenry Elderfield
    Henry Elderfield
  • MKMiriam Kastner
    Miriam Kastner
  • JMJonathan B. Martin
    Jonathan B. Martin
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Abstract
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−, equivalent to ∼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 (87Sr/86Sr up to 0.70996), possibly originating from continental crust, and a southerly regime where fluids contain Sr less radiogenic than seawater (87Sr/86Sr down to 0.70722), and which are also enriched in Ca2+ and depleted in Mg2+ and δ18O, that appear to have interacted with oceanic basement. O, C, and He isotopic data support these interpretations.

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