40 Ar/ 39 Ar Dating into the Historical Realm: Calibration Against Pliny the Younger

Author:

Renne P. R.1234,Sharp W. D.1234,Deino A. L.1234,Orsi G.1234,Civetta L.1234

Affiliation:

1. P. R. Renne, Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, USA, and Department of Geology and Geophysics, University of California, Berkeley, CA 94720, USA.

2. W. D. Sharp and A. L. Deino, Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, USA.

3. G. Orsi, Dipartamento di Geofisica e Vulcanologia, Università di Napoli, Largo Santo Marcellino 10, Napoli, Italy.

4. L. Civetta, Dipartamento di Geofisica e Vulcanologia Universitàdi Napoli, Largo Santo Marcellino 10, Napoli, Italy, and Vesuvian Volcanological Observatory, 249 Via Manzoni, Napoli, Italy.

Abstract

Laser incremental heating of sanidine from the pumice deposited by the Plinian eruption of Vesuvius in 79 A.D. yielded a 40 Ar/ 39 Ar isochron age of 1925 ± 94 years ago. Close agreement with the Gregorian calendar–based age of 1918 years ago demonstrates that the 40 Ar/ 39 Ar method can be reliably extended into the temporal range of recorded history. Excess 40 Ar is present in the sanidine in concentrations that would cause significant errors if ignored in dating Holocene samples.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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