Quantitative Analyses of Radiogenic Argon in Micas by Isotope Dilution Method

J Okano

doi:10.5702/massspec1953.9.23

J Okano

Author information

JOURNAL FREE ACCESS

1961 Volume 9 Issue 17 Pages 23-29

DOI https://doi.org/10.5702/massspec1953.9.23

Details

Published: April 30, 1961 Received: March 15, 1961 Available on J-STAGE: June 28, 2010 Accepted: - Advance online publication: - Revised: -
Correction information
Date of correction: June 28, 2010 Reason for correction: - Correction: ABSTRACT Details: Wrong : To extract radiogenic argon from micas and to purify extracted gases, an apparatus was constructed. The procedures for the extraction and the purification were described. Purified gases were analysed by a mass spectrometer and methane and helium were observed as main components of their impurities. Extracation efficiency of radiogenic argon from the muscovite(Mt. Ishikawa, 16-80mesh)was studied and it was seen that among the total argon extracted during 20hours' heating at1100°C, more than 99 percent was extracted in10hours. Quantitative analyses of radiogenic argon with two kinds of Japanese mica(Mt. Ishikawa, Fukushima-ken and Mt. Daiichi-suisho, Fukushima-ken)and M. I. T. standard biotite 3203 were carried out isotope dilution method. Quantities of radiogenic argon per one gram of these micas were3.65×10-5 cc STP, 2.84×10-5 cc STP and3.87×10-4cc STP, respectively. K-Ar age of these two kinds of Japanese micas were estimated to be1.3×108 years and1.5×108years respectively. The quantity of radiogenic argon in standard biotite 3203 obtained in this work were in good agreement with those reported by others.
Right : To extract radiogenic argon from micas and to purify extracted gases, an apparatus was constructed. The procedures for the extraction and the purification were described. Purified gases were analysed by a mass spectrometer and methane and helium were observed as main components of their impurities. Extracation efficiency of radiogenic argon from the muscovite(Mt. Ishikawa, 16-80 mesh)was studied and it was seen that among the total argon extracted during 20hours' heating at 1100°C, more than 99 percent was extracted in 10 hours. Quantitative analyses of radiogenic argon with two kinds of Japanese mica (Mt. Ishikawa, Fukushima-ken and Mt. Daiichi-suisho, Fukushima-ken) and M. I. T. standard biotite 3203 were carried out isotope dilution method. Quantities of radiogenic argon per one gram of these micas were 3.65×10^-5cc STP, 2.84×10^-5cc STP and 3.87×10^-4 cc STP, respectively. K-Ar age of these two kinds of Japanese micas were estimated to be 1.3×10⁸ years and 1.5×10⁸ years respectively. The quantity of radiogenic argon in standard biotite 3203 obtained in this work were in good agreement with those reported by others.

Date of correction: June 28, 2010 Reason for correction: - Correction: AFFILIATION Details: Wrong :
1) Depertment of Physics,Faculty of Science, Osaka University(Nakanoshima,Kita-ku, Osaka)

Right :
1) Depertment of Physics,Faculty of Science, Osaka University

Date of correction: June 28, 2010 Reason for correction: - Correction: CITATION Details: Wrong : E
E

Right : J. Okano, et. al. Mass Spectroscopy, 15, 16(1960).
Fairbairn, H. W., et. al. Bull. Geol. Soc. America, 71, 399(1960).

Abstract

To extract radiogenic argon from micas and to purify extracted gases, an apparatus was constructed. The procedures for the extraction and the purification were described. Purified gases were analysed by a mass spectrometer and methane and helium were observed as main components of their impurities. Extracation efficiency of radiogenic argon from the muscovite(Mt. Ishikawa, 16-80 mesh)was studied and it was seen that among the total argon extracted during 20hours' heating at 1100°C, more than 99 percent was extracted in 10 hours. Quantitative analyses of radiogenic argon with two kinds of Japanese mica (Mt. Ishikawa, Fukushima-ken and Mt. Daiichi-suisho, Fukushima-ken) and M. I. T. standard biotite 3203 were carried out isotope dilution method. Quantities of radiogenic argon per one gram of these micas were 3.65×10^-5cc STP, 2.84×10^-5cc STP and 3.87×10^-4 cc STP, respectively. K-Ar age of these two kinds of Japanese micas were estimated to be 1.3×10⁸ years and 1.5×10⁸ years respectively. The quantity of radiogenic argon in standard biotite 3203 obtained in this work were in good agreement with those reported by others.

Corresponding author

Correction information

Register with J-STAGE for free!