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      Refining the Quaternary Geomagnetic Instability Time Scale (GITS): Lava flow recordings of the Blake and Post-Blake excursions

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      Quaternary Geochronology
      Elsevier BV

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          Intercalibration of standards, absolute ages and uncertainties in 40Ar/39Ar dating

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            Synchronizing rock clocks of Earth history.

            Calibration of the geological time scale is achieved by independent radioisotopic and astronomical dating, but these techniques yield discrepancies of approximately 1.0% or more, limiting our ability to reconstruct Earth history. To overcome this fundamental setback, we compared astronomical and 40Ar/39Ar ages of tephras in marine deposits in Morocco to calibrate the age of Fish Canyon sanidine, the most widely used standard in 40Ar/39Ar geochronology. This calibration results in a more precise older age of 28.201 +/- 0.046 million years ago (Ma) and reduces the 40Ar/39Ar method's absolute uncertainty from approximately 2.5 to 0.25%. In addition, this calibration provides tight constraints for the astronomical tuning of pre-Neogene successions, resulting in a mutually consistent age of approximately 65.95 Ma for the Cretaceous/Tertiary boundary.
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              Global changes in intensity of the Earth's magnetic field during the past 800 kyr

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                Author and article information

                Journal
                Quaternary Geochronology
                Quaternary Geochronology
                Elsevier BV
                18711014
                June 2014
                June 2014
                : 21
                : 16-28
                Article
                10.1016/j.quageo.2012.12.005
                c23388b6-30c8-4e64-b0c9-06924d4c70c5
                © 2014
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