Seawater intrusion through the oceanic crust and carbonate sediment in the Equatorial Pacific: Lithium abundance and isotopic evidence

Chen Feng You, L. H. Chan, J. M. Gieskes, G. P. Klinkhammer

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Large-scale lateral advection of seawater within the oceanic crust is thought to be the cause of low heat flow in the Equatorial Pacific. Until now supportive evidence in limited to reversals of B and δ11B, Ca, Mg, SO4-2, Sr and 87 Sr/86 Sr in sediment pore waters. Here we report new evidence from a detailed study of Li and its isotopes in sediment cores from ODP Sites 844 and 851. Carbonates at these sites were significantly recrystallized leading to large variations in Li and δ7 Li in the sediments and associated pore waters. In addition to diagenetic effects, distinct reversals in lithium concentration and isotopic ratio toward modern seawater composition are observed in waters near the basaltic basement, lending further support to the seawater intrusion hypothesis. Three endmembers are identified in the pore waters: seawater, a diagenetically altered component, and evolved crustal fluid. The new lithium isotopic results underscore the importance of diagenetic artifacts in carbonate sediments.

Original languageEnglish
Pages (from-to)OCE 5-1 - OCE 5-4
JournalGeophysical Research Letters
Volume30
Issue number21
DOIs
Publication statusPublished - 2003 Nov 1

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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