NDLI: Intercalibration of international and domestic $^{40}$Ar/$^{39}$Ar dating standards

Content Provider	Springer Nature Link
Author	Wang, Fei He, Huaiyu Zhu, Rixiang Sang, Haiqing Wang, Yinglan Yang, Liekun
Copyright Year	2006
Abstract	Four international standards, Ga1550, MMhb-1, Lp-6, Bem 4M, and one domestic standard BT-1 have been intercalibrated. The repeated measurements on MMhb-1 with different mass demonstrate that MMhb-1 is inhomogeneous in age and its average age is 519.8 Ma. The results of Bern 4M and Lp-6 reflect that they have an invariable value of $^{40}$Ar*/$^{39}$Ar$_{k}$ (F) and the ages we obtained are consensus with their K-Ar age: Lp-6=127.7Ma; Bern 4M=18.2 Ma. Analyses of BT-1 age spectra, Ca/K and Cl/K spectra as well as inverse isochrons indicate that the sample is homogeneous and invariable and keeps close chemically, with its trapped argon isotope composition close to the atmosphere. The dating results show that age values are reproducible and steady, total fusion age, step-heating age, plateau age and isochron age are in accord with each other within the error range (2σ). Therefore, we recommend 28.7 Ma as the calibrated age of BT-1.We also discuss the variation in neutron flux gradients of Beijing 49-2 reactor. It was found that the neutron flux gradient varies considerably, and more monitors (standard samples) are needed to fix the trend of variation. The coefficient of the 49-2 reactor that transfers the ratio of production rate of $^{37}$Ar$_{Ca}$/$^{39}$Ar$_{K}$ into Ca/K ratio is 1.78. This is different from that reported earlier, 2.0, which may be caused by the reconstruction of the reactor.
Starting Page	461
Ending Page	470
Page Count	10
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	49
Issue Number	5
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2006-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	$^{40}$Ar/$^{39}$Ar dating standards intercalibration 49-2 reactor Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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