Calibration of the interlaboratory 40Ar39Ar dating standard, MMhb-1

Scott D. Samson; E. Calvin Alexander

doi:10.1016/0168-9622(87)90025-X

Calibration of the interlaboratory ⁴⁰Ar³⁹Ar dating standard, MMhb-1

Scott D. Samson, E. Calvin Alexander

Research output: Contribution to journal › Article › peer-review

680 Scopus citations

Abstract

KAr data has been compiled from over 18 laboratories on the ⁴⁰Ar³⁹Ar dating standard, MMhb-1. The new recommended age for the monitor is 520.4 ± 1.7 Ma. The interlaboratory precision for K is 1.06% and for Ar is 1.89%. ⁴⁰Ar-³⁹Ar analyses of MMhb-1 have shown that the ⁴⁰Ar^{{black star} 40}K ratio is uniform at better than the 0.1% level, thus variations in the conventional determinations are a result of systematic variations and interlaboratory biases. We recommend a set of ⁴⁰Ar³⁹Ar standards be prepared and adopted by the KAr community to reduce uncertainty in intersample age comparison. Further, an organization like the U.S. National Bureau of Standards should be encouraged to "unconventionally" calibrate these monitors if the precision of which the ⁴⁰Ar³⁹Ar technique is capable is to be approached.

Original language	English (US)
Pages (from-to)	27-34
Number of pages	8
Journal	Chemical Geology: Isotope Geoscience Section
Volume	66
Issue number	1-2
DOIs	https://doi.org/10.1016/0168-9622(87)90025-X
State	Published - Nov 25 1987
Externally published	Yes

ASJC Scopus subject areas

Environmental Science(all)
Earth and Planetary Sciences(all)

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title = "Calibration of the interlaboratory 40Ar39Ar dating standard, MMhb-1",

abstract = "KAr data has been compiled from over 18 laboratories on the 40Ar39Ar dating standard, MMhb-1. The new recommended age for the monitor is 520.4 ± 1.7 Ma. The interlaboratory precision for K is 1.06% and for Ar is 1.89%. 40Ar-39Ar analyses of MMhb-1 have shown that the 40Ar{black star} 40K ratio is uniform at better than the 0.1% level, thus variations in the conventional determinations are a result of systematic variations and interlaboratory biases. We recommend a set of 40Ar39Ar standards be prepared and adopted by the KAr community to reduce uncertainty in intersample age comparison. Further, an organization like the U.S. National Bureau of Standards should be encouraged to {"}unconventionally{"} calibrate these monitors if the precision of which the 40Ar39Ar technique is capable is to be approached.",

author = "Samson, {Scott D.} and Alexander, {E. Calvin}",

note = "Funding Information: Preparation of the new McClure Mountain standards was supported by NASA grants NAG-9-66 and NGT-25-001-800. S.S. acknowledges partial support for this work from the University of Minnesota and thanks J.C. Roddick for very helpful discussions.",

year = "1987",

month = nov,

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doi = "10.1016/0168-9622(87)90025-X",

language = "English (US)",

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pages = "27--34",

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T1 - Calibration of the interlaboratory 40Ar39Ar dating standard, MMhb-1

AU - Samson, Scott D.

AU - Alexander, E. Calvin

N1 - Funding Information: Preparation of the new McClure Mountain standards was supported by NASA grants NAG-9-66 and NGT-25-001-800. S.S. acknowledges partial support for this work from the University of Minnesota and thanks J.C. Roddick for very helpful discussions.

PY - 1987/11/25

Y1 - 1987/11/25

N2 - KAr data has been compiled from over 18 laboratories on the 40Ar39Ar dating standard, MMhb-1. The new recommended age for the monitor is 520.4 ± 1.7 Ma. The interlaboratory precision for K is 1.06% and for Ar is 1.89%. 40Ar-39Ar analyses of MMhb-1 have shown that the 40Ar{black star} 40K ratio is uniform at better than the 0.1% level, thus variations in the conventional determinations are a result of systematic variations and interlaboratory biases. We recommend a set of 40Ar39Ar standards be prepared and adopted by the KAr community to reduce uncertainty in intersample age comparison. Further, an organization like the U.S. National Bureau of Standards should be encouraged to "unconventionally" calibrate these monitors if the precision of which the 40Ar39Ar technique is capable is to be approached.

AB - KAr data has been compiled from over 18 laboratories on the 40Ar39Ar dating standard, MMhb-1. The new recommended age for the monitor is 520.4 ± 1.7 Ma. The interlaboratory precision for K is 1.06% and for Ar is 1.89%. 40Ar-39Ar analyses of MMhb-1 have shown that the 40Ar{black star} 40K ratio is uniform at better than the 0.1% level, thus variations in the conventional determinations are a result of systematic variations and interlaboratory biases. We recommend a set of 40Ar39Ar standards be prepared and adopted by the KAr community to reduce uncertainty in intersample age comparison. Further, an organization like the U.S. National Bureau of Standards should be encouraged to "unconventionally" calibrate these monitors if the precision of which the 40Ar39Ar technique is capable is to be approached.

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Calibration of the interlaboratory ⁴⁰Ar³⁹Ar dating standard, MMhb-1

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