Seawater ventilation of mid-Pacific guyots drilled during Leg 143

C. K. Paull, P. D. Fullagar, T. J. Bralower, U. Rohl

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Active exchange between guyot interior pore-waters and surrounding seawater is indicated by 87Sr/86Sr and δ18O values of pore waters and by 87Sr/86Sr values of their host carbonates, sampled from the interior of Allison (Site 865) and Resolution (Site 866) guyots. The 87Sr/86Sr values and strontium concentrations of the pore fluids are similar to modern seawater, rather than to their host carbonates. This requires that seawater flushing rates adequate to keep the strontium in pore waters in guyots at or near equilibrium with modern seawater. However, some restriction in the seawater circulation is suggested, because δ18O values of pore waters from the pelagic cap section of Site 865 are not like those of the surrounding seawater and because temperatures increase downhole at both guyots. Large flushing volumes may be an important part of the cementation and corrosion of these platforms. -from Authors

Original languageEnglish (US)
Pages (from-to)231-241
Number of pages11
JournalUnknown Journal
DOIs
StatePublished - 1995

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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