Isotopic variations in dolomite concentrations from the Monterey Formation, California ( Miocene).

J. Hennessy, L. P. Knauth

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Isotopic analysis of dolomite concentrations from the Miocene Monterey Formation yields a covariance of delta 18O and delta 13C within every concretion analyzed. The total range for all concretions in delta 18O (SMOW) is +27.3 per mille to +33.6 per mille. The total range in delta 13C (PDB) is -10.2 per mille to +10.8 per mille. Variations of up to 3.6 per mille in oxygen and 12.2 per mille in carbon are encountered within a single concretion. Decreasing delta 18O is interpreted in terms of increasing temperatures of formation as the concretion grows during burial. The Claypool and Kaplan (1974) model can be successfully used to interpret carbon isotope variations as the result of progressive concretion growth in the zones of microbial sulfate reduction, microbial methane production, and thermocatalytic decarboxylation. Multiple sampling of several concretions at a single outcrop yields a more complete early diagenetic history than by sampling only one concretion. Isotopic diagenetic profiles inferred from the dolomite concretions are similar to those seen in DSDP cores where deep-sea dolomitization is occurring today.-from Authors

Original languageEnglish (US)
Pages (from-to)120-130
Number of pages11
JournalJournal of Sedimentary Petrology
Volume55
Issue number1
DOIs
StatePublished - 1985

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concretion
dolomite
Miocene
decarboxylation
isotopic analysis
dolomitization
sampling
Deep Sea Drilling Project
carbon isotope
deep sea
outcrop
methane
sulfate
oxygen
carbon
history

ASJC Scopus subject areas

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

Cite this

Isotopic variations in dolomite concentrations from the Monterey Formation, California ( Miocene). / Hennessy, J.; Knauth, L. P.

In: Journal of Sedimentary Petrology, Vol. 55, No. 1, 1985, p. 120-130.

Research output: Contribution to journalArticle

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