Large-scale lateral advection of seawater through oceanic crust in the central Equatorial Pacific

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doi: 10.1016/0012-821X(91)90189-O
Author(s): Baker, Paul A.; Stout, Paul M.; Kastner, Miriam; Elderfield, Henry
Author Affiliation(s): Primary:
Duke Univ., Dep. Geol., Durham, NC, United States
Other:
ERM-South, Tampa, FL, Tampa, FL, United States
Scripps Inst. Oceanogr., United States
Univ. Cambridge, United Kingdom
Volume Title: Earth and Planetary Science Letters
Source: Earth and Planetary Science Letters, 105(4), p.522-533. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X CODEN: EPSLA2
Note: In English. 49 refs.; illus. incl. sketch map
Summary: The existence of large-scale advection of sea-water through basaltic crust in this region is demonstrated by the Ca, Mg, Sr, sulphate and Sr isotopic compositions of pore waters from the overlying sediments. The advection is believed to extend throughout the region of the equatorial high-productivity sediment bulge from approx 100 to 160 degrees W and from approx 5 degrees S to 8 degrees N. The corresponding crustal ages of this region vary from E to W by approx 15 to approx 70 m.y., respectively. This advection is responsible for the low-conductive heat flows previously observed throughout the region. The flow is recognized by the following pore water compositional variations: Ca and Mg concentrations remain nearly constant downhole from the sediment- water interface to basement. Species, such as Sr, sulphate and Sr isotopes, which are more affected by diagenetic reactions in the sediment column, depart from sea-water values with increasing depth in the sediments, but then they display concentration reversals near basement. At the sediment-basement interface, pore waters are nearly indistinguishable from present-day sea-water. [Authors' abstract]
Year of Publication: 1991
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 02 Geochemistry; 18 Geophysics, Solid-Earth; Advection; Anomalies; Central Pacific; Crust; Deep Sea Drilling Project; Deep-sea environment; Diagenesis; Equatorial Pacific; Geochemistry; Heat flow; IPOD; Leg 85; Marine environment; Marine sediments; Oceanic crust; Pacific Ocean; Pore water; Sea water; Sediments; Tectonophysics
Coordinates: N002954 N055100 W1135030 W1332010
Record ID: 1991054698
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom