Summary
Abstract: The reconstruction of detailed, basin-scale depositional histories from sedimentary rocks fundamentally depends on the availability of reliable time markers. Unlike marine strata, lacustrine strata typically lack rapidly evolving, cosmopolitan fauna or flora that might serve this purpose. Depending on their geologic context, lacustrine strata may also lack tephras that could provide isochronous markers or radioisotopic age. Variations in 87 Sr/ 86 Sr ratios could potentially provide an alternative means of chronostratigraphic correlation for carbonate-rich lake deposits, based on the hypothesis that Sr isotopes are well mixed in a lake and do not experience significant fractionation. To test this hypothesis we measured 87 Sr/ 86 Sr ratios in 114 samples from two drill cores of t
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