40Ar/39Ar age calibration against counted annuallayers

Michael Storey, Ole Stecher

Publikation: Bidrag til tidsskriftKonferenceabstrakt i tidsskriftForskning

Abstract

The 40Ar/39Ar method, based on the decay of the naturally occurring radioactive isotope 40K, is capable of producing ages with precision better than ± 0.1 %. However, accuracy is limited to no better than 1 % mainly due to the relatively large uncertainty in the 40K decay constants. One approach worth exploring for an improved absolute age basis for the 40Ar/39Ar system is through cross-calibration with counted annual layers (e.g. tree rings, varves and ice cores). North Atlantic Ash Zone (NAAZ) II is found within the dated part of the annual Greenland ice core record. NAAZ II has been correlated to the Icelandic peralkaline rhyolitic Thorsmörk ignimbrite. We will present preliminary 40Ar/39Ar results on the age of this eruption

OriginalsprogEngelsk
TidsskriftGeophysical Research Abstracts
Vol/bind10
Antal sider1
ISSN1607-7962
StatusUdgivet - 2008
Begivenhed5th EGU General Assembly - Wien, Østrig
Varighed: 13 apr. 200818 apr. 2008
Konferencens nummer: 5

Konference

Konference5th EGU General Assembly
Nummer5
LandØstrig
ByWien
Periode13/04/200818/04/2008

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