Geochemical and geothermal evidence for fluid migration in the Barbados accretionary prism (ODP Leg 110)

Journal Article · Wed May 01 04:00:00 EDT 1991 · Geophysical Research Letters (American Geophysical Union); (United States)

DOI:https://doi.org/10.1029/91GL00913· OSTI ID:5598059

Vrolijk, P ^[1]; Fisher, A; Gieskes, J

---

1. Exxon Production Research Co., Houston, TX (United States)

Measured geochemical and geothermal effects of fluid migration in the northern Barbados accretionary prism indicate that: (1) fluid flows laterally along low-angle active faults; (2) the entire length of the Leg 110 transect is a fluid discharge zone; (3) migration results in heating of sediments across the transect but most strongly at the deformation front; and (4) migration results in dilution of pore water-Cl and {sup 18}O enrichment more in the arcward than the seaward side of the prism, suggesting that the Cl-poor, {sup 18}O-rich fluids that intrude the prism are derived from smectite-illite reactions occurring arcward. These conclusions have strengthened those derived from the initial appraisal of shipboard data, modified ideas about where fluids are heated most and where the geochemistry is strongly altered, and provided new ideas about the sources of fluids and their relative contributions.

• OSTI ID: 5598059
• Journal Information: Geophysical Research Letters (American Geophysical Union); (United States), Journal Name: Geophysical Research Letters (American Geophysical Union); (United States) Vol. 18:5; ISSN 0094-8276; ISSN GPRLA
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
BARBADOS
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
CLAYS
CONTINENTAL CRUST
DEFORMATION
EARTH CRUST
ENRICHMENT
ENVIRONMENTAL TRANSPORT
EVEN-EVEN NUCLEI
FLUID FLOW
FLUIDS
GEOCHEMISTRY
GEOLOGIC FAULTS
GEOLOGIC FORMATIONS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOTHERMAL GRADIENTS
HALIDES
HALOGEN COMPOUNDS
HYDROLOGY
ILLITE
ISLANDS
ISOTOPES
LESSER ANTILLES
LIGHT NUCLEI
MASS TRANSFER
MINERALS
NUCLEI
OXYGEN 18
OXYGEN ISOTOPES
RESERVOIR FLUIDS
SILICATE MINERALS
SMECTITE
STABLE ISOTOPES
TEMPERATURE GRADIENTS
WEST INDIES