Stable isotope variations in the neoproterozoic beck spring dolomite and mesoproterozoic mescal limestone paleokarst: Implications for life on land in the Precambrian

R. Kenny, L. P. Knauth

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

Proterozoic karst events lowered δ13C values-by as much as 11‰ for the 800 Ma Beck Spring Dolomite, California, and as much as 8.5‰ for the 1.1 Ga Mescal Limestone, central Arizona, relative to the originally deposited carbonate. The 13C changes are attributed to input of 13C-depleted organic CO2 derived from photosynthetic organisms that colonized the ancient land surface. The large isotopic shift and its presence at two separate localities suggest that Proterozoic karst surfaces were colonized by significant photosynthetic communities with phytomasses possibly approaching those of today.

Original languageEnglish (US)
Pages (from-to)650-658
Number of pages9
JournalBulletin of the Geological Society of America
Volume113
Issue number5
DOIs
StatePublished - May 1 2001

Keywords

  • Carbonate
  • Mesoproterozoic
  • Neoproterozoic
  • Paleokarst
  • Stable isotopes
  • Terrestrial environment

ASJC Scopus subject areas

  • Geology

Fingerprint Dive into the research topics of 'Stable isotope variations in the neoproterozoic beck spring dolomite and mesoproterozoic mescal limestone paleokarst: Implications for life on land in the Precambrian'. Together they form a unique fingerprint.

  • Cite this