40Ar/39Ar age calibration against counted annuallayers

Michael Storey, Ole Stecher

Research output: Contribution to journalConference abstract in journalResearch

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
Original languageEnglish
JournalGeophysical Research Abstracts
Volume10
Number of pages1
ISSN1607-7962
Publication statusPublished - 2008
Event5th EGU General Assembly - Wien, Austria
Duration: 13 Apr 200818 Apr 2008
Conference number: 5

Conference

Conference5th EGU General Assembly
Number5
CountryAustria
CityWien
Period13/04/200818/04/2008

Cite this

Storey, Michael ; Stecher, Ole. / 40Ar/39Ar age calibration against counted annuallayers. In: Geophysical Research Abstracts. 2008 ; Vol. 10.
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title = "40Ar/39Ar age calibration against counted annuallayers",
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 Thorsm{\"o}rk ignimbrite. We will present preliminary 40Ar/39Ar results on the age of this eruption",
author = "Michael Storey and Ole Stecher",
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journal = "Geophysical Research Abstracts",
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40Ar/39Ar age calibration against counted annuallayers. / Storey, Michael; Stecher, Ole.

In: Geophysical Research Abstracts, Vol. 10, 2008.

Research output: Contribution to journalConference abstract in journalResearch

TY - ABST

T1 - 40Ar/39Ar age calibration against counted annuallayers

AU - Storey, Michael

AU - Stecher, Ole

PY - 2008

Y1 - 2008

N2 - 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

AB - 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

M3 - Conference abstract in journal

VL - 10

JO - Geophysical Research Abstracts

JF - Geophysical Research Abstracts

SN - 1607-7962

ER -