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 |
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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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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%. 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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.</abstract><cop>Washington, DC</cop><pub>American Association for the Advancement of Science</pub><pmid>18436783</pmid><doi>10.1126/science.1154339</doi><tpages>5</tpages></addata></record> |
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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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