Compositions and sources of fluids in sediments of the Peru subduction zone
Journal Article
·
· Journal of Geophysical Research; (United States)
- Cambridge Univ. (England)
- 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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Related Subjects
58 GEOSCIENCES
580000* -- Geosciences
ALKALINE EARTH ISOTOPES
ALKALINE EARTH METALS
BETA DECAY RADIOISOTOPES
BOREHOLES
CALCIUM
CARBON ISOTOPES
CAVITIES
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
CONTINENTAL CRUST
CONTINENTAL MARGIN
DEVELOPING COUNTRIES
DILUTION
DRILLING
EARTH CRUST
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GEOCHEMISTRY
GROUND WATER
HALIDES
HALOGEN COMPOUNDS
HELIUM ISOTOPES
HOURS LIVING RADIOISOTOPES
HYDROGEN COMPOUNDS
HYDROLOGY
INTERMEDIATE MASS NUCLEI
INTERSTITIAL WATER
ISOMERIC TRANSITION ISOTOPES
ISOTOPE RATIO
ISOTOPES
LATIN AMERICA
LIGHT NUCLEI
MAGNESIUM
METALS
NUCLEI
OCEANIC CRUST
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PERU
PLATE TECTONICS
RADIOISOTOPES
SEAWATER
SEDIMENTS
SOUTH AMERICA
STABLE ISOTOPES
STRONTIUM 86
STRONTIUM 87
STRONTIUM ISOTOPES
SUBDUCTION ZONES
TECTONICS
WATER
WELL DRILLING
580000* -- Geosciences
ALKALINE EARTH ISOTOPES
ALKALINE EARTH METALS
BETA DECAY RADIOISOTOPES
BOREHOLES
CALCIUM
CARBON ISOTOPES
CAVITIES
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
CONTINENTAL CRUST
CONTINENTAL MARGIN
DEVELOPING COUNTRIES
DILUTION
DRILLING
EARTH CRUST
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GEOCHEMISTRY
GROUND WATER
HALIDES
HALOGEN COMPOUNDS
HELIUM ISOTOPES
HOURS LIVING RADIOISOTOPES
HYDROGEN COMPOUNDS
HYDROLOGY
INTERMEDIATE MASS NUCLEI
INTERSTITIAL WATER
ISOMERIC TRANSITION ISOTOPES
ISOTOPE RATIO
ISOTOPES
LATIN AMERICA
LIGHT NUCLEI
MAGNESIUM
METALS
NUCLEI
OCEANIC CRUST
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PERU
PLATE TECTONICS
RADIOISOTOPES
SEAWATER
SEDIMENTS
SOUTH AMERICA
STABLE ISOTOPES
STRONTIUM 86
STRONTIUM 87
STRONTIUM ISOTOPES
SUBDUCTION ZONES
TECTONICS
WATER
WELL DRILLING