Seawater chemistry and the advent of biocalcification

Sean T. Brennan, Tim K. Lowenstein, Juske Horita

Research output: Contribution to journalArticlepeer-review

156 Scopus citations

Abstract

Major ion compositions of primary fluid inclusions from terminal Proterozoic (ca. 544 Ma) and Early Cambrian (ca. 515 Ma) marine halites indicate that seawater Ca2+ concentrations increased approximately threefold during the Early Cambrian. The timing of this shift in seawater chemistry broadly coincides with the "Cambrian explosion," a brief drop in marine 87Sr/86Sr values, and an increase in tectonic activity, suggesting a link between the advent of biocalcification, hydrothermal mid-ocean-ridge brine production, and the composition of seawater. The Early Cambrian surge in oceanic [Ca2+] was likely the first such increase following the rise of metazoans and may have spurred evolutionary changes in marine biota.

Original languageEnglish
Pages (from-to)473-476
Number of pages4
JournalGeology
Volume32
Issue number6
DOIs
StatePublished - Jun 2004

Keywords

  • Biomineralization
  • Cambrian explosion
  • Evaporites
  • Fluid inclusions
  • Seawater

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