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Intercalibration of astronomical and radioisotopic time

Paul R. Renne, Alan L. Deino, Robert C. Walter, Brent D. Turrin, Carl C. Swisher, Tim A. Becker, Garniss H. Curtis, Warren D. Sharp and Abdur-Rahim Jaouni
Intercalibration of astronomical and radioisotopic time
Geology (Boulder) (September 1994) 22 (9): 783-786


The (super 40) Ar/ (super 39) Ar radioisotopic dating technique is one of the most precise and versatile methods available for dating events in Earth's history, but the accuracy of this method is limited by the accuracy with which the ages of neutron-fluence monitors (dating standards) are known. Calibrating the ages of standards by conventional means has proved difficult and contentious. The emerging astronomically calibrated geomagnetic polarity time scale (APTS) offers a means to calibrate the ages of (super 40) Ar/ (super 39) Ar dating standards that is independent of absolute isotopic abundance measurements. Seven published (super 40) Ar/ (super 39) Ar dates for polarity transitions, nominally ranging from 0.78 to 3.40 Ma, are based on the Fish Canyon sanidine standard and can be compared with APTS predictions. Solving the (super 40) Ar/ (super 39) Ar age equation for the age of the Fish Canyon sanidine that produces coincidence with the APTS age for each of these seven reversals yields mutually indistinguishable estimates ranging from 27.78 to 28.09 Ma, with an inverse variance-weighted mean of 27.95 + or - 0.18 Ma. Normalized residuals are minimized at an age of 27.92 Ma, indicating the robustness of the solution.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 22
Serial Issue: 9
Title: Intercalibration of astronomical and radioisotopic time
Affiliation: Institute of Human Origins Geochronology Center, Berkeley, CA, United States
Pages: 783-786
Published: 199409
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 29
Accession Number: 1994-047798
Categories: Geochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N37°00'00" - N41°00'00", W109°00'00" - W102°00'00"
Secondary Affiliation: U. S. Geological Survey, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199422
Program Name: USGSOPNon-USGS publications with USGS authors
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