Sr-isotope stratigraphy: Assigning time in the campanian, pliensbachian, toarcian, and valanginian

John M. McArthur, Thomas Steuber, Kevin N. Page, Neil H. Landman

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

The trend of marine87Sr/86Sr against stratigraphic level through sections, whether linear or not, can identify hiatuses and changing rates of sedimentation through those sections and so be a valuable constraint on attempts to assign numerical ages to sediments on the basis of astrochronology or U/Pb dating of zircons. Here we illustrate that value for the Campanian, Pliensbachian, Toarcian, and Valanginian ages by comparing87Sr/86Sr profiles for different localities and comparing those to the87Sr/86Sr profile through time. The analysis reveals possible problems both with current time scales and with some astrochronological calibrations. Our analysis is neither comprehensive nor final; rather, with a few examples, we show how Sr-isotope stratigraphy can be used to moderate other methods of assigning numerical ages to sediments.

Original languageBritish English
Pages (from-to)569-586
Number of pages18
JournalJournal of Geology
Volume124
Issue number5
DOIs
StatePublished - Sep 2016

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