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- W2741749105 abstract "AbstractThe 40 Ar/ 39 Ar dating technique is based on the knowledge of the age of neutron fluence monitors (standards). RecentinvestigationshaveimprovedtheaccuracyandprecisionoftheagesofmostofthePhanerozoic-agedstandards(e.g.FishCanyonTuffsanidine(FCs),AlderCreeksanidine,GA1550biotiteandLP-6biotite);however,nospecificstudyhasbeenundertakenontheolderstandards (i.e. Hb3gr hornblende and NL-25 hornblende) generally used to date Precambrian, high Ca/K, and/or meteoritic rocks.In this study, we show that Hb3gr hornblende is relatively homogenous in age, composition (Ca/K) and atmosphericcontamination at the single grain level. The mean standard deviation of the 40 Ar⁎/ 39 Ar K (F-value) derived from this study is 0.49%,comparable to the most homogeneous standards. The intercalibration factor (which allows direct comparison between standards)between Hb3gr and FCs is R FCsHb3gr =51.945±0.167. Using an age of 28.02 Ma for FCs, the age of Hb3gr derived from the R-value is1073.6±5.3Ma (1σ; internal error only) and ±8.8Ma (including all sources of error). This age is indistinguishable withinuncertainty from the K/Ar age previously reported at 1072±11Ma [Turner G., Huneke, J.C., Podosek, F.A., Wasserburg, G.J.,1971." @default.
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- W2741749105 date "2006-01-01" @default.
- W2741749105 modified "2023-09-27" @default.
- W2741749105 title "Intercalibration of the Hb3gr 40 Ar/ 39 Ar dating standard" @default.
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