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 ~1.0% or more, limiting our ability to reconstruct Earth history. To overcome this fundamental setback, we compared astronomical and ⁴⁰Ar/³⁹Ar ages o...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 2008-04, Vol.320 (5875), p.500-504
Hauptverfasser: Kuiper, K.F, Deino, A, Hilgen, F.J, Krijgsman, W, Renne, P.R, Wijbrans, J.R
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container_title Science (American Association for the Advancement of Science)
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creator Kuiper, K.F
Deino, A
Hilgen, F.J
Krijgsman, W
Renne, P.R
Wijbrans, J.R
description Calibration of the geological time scale is achieved by independent radioisotopic and astronomical dating, but these techniques yield discrepancies of ~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 ~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 ~65.95 Ma for the Cretaceous/Tertiary boundary.
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subjects Age
Age discrimination
Astronomical methods
Astronomy
Calibration
Earth
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geochronology
Geological time
Geology
Isotope geochemistry. Geochronology
Mathematical minima
Precession
Research Article
Stratigraphy
Tephra
title Synchronizing Rock Clocks of Earth History
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