Direct Rhenium-Osmium age of the Oxfordian-Kimmeridgian boundary, Staffin bay, Isle of Skye, U.K., and the Late Jurassic time scale
作者： David Selby
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摘要: Ar39 Ar age for the basal Berriasian suggest that duration of Kimmeridgian and Tithonian were nominally ~650 k.y. shorter than previously determined. The Re-Os data Staffin black shale indicates seawater Os isotope composition at Oxfordian/Kimmeridgian boundary was radiogenic ( 187 Os/ 188 = 0.53), similar to Early Tithonian, but much higher Late Callovian 0.27). These compositions rate continental weathering had increased from Kimmeridgian/Tithonian.
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