Abstract

The Sr isotopic composition of authigenic marine carbonates can be used effectively with the known Sr isotopic evolution of seawater to decipher chronostratigraphic relationships and correlate the Monterey Formation. The Sr isotopic chronostratigraphy of both the Oakview and Mussel Rock sections agrees with published biostratigraphic ages. Correlations of lithologic members between the two sections are also in accord with the published lithologic and biostratigraphic correlations. Time and stratigraphic resolutions of Sr isotopic chronostratigraphy are dependent upon the slope of the seawater Sr evolution curve, sedimentation rates, inherent Sr isotopic variability, and analytical precisions. On the average, individual analyses yield time resolutions of 0.5 Ma and stratigraphic resolutions of 10–70 m of section.

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