Results and future tasks in field of absolute age determination

Results of analyses of standard geochronological samples

“…K = , 0,0557.10-9 yr -7 k K =0,0585X t, ng g X 10 -9 yr -7 X (3 0,472.10 -9 yr-i IGN AN ArmSSR, Yerevan calculated from different isotope ratios (Avdzeyko, 1955). As shown by Stank (1955), all these determinations gave virtually the same age (1700-1800 m. Table 3 gives the converted results of an analysis of Chernaya Salma biotite, obtained in six laboratories and given in the above-mentioned report of Afanas'yev et al (1960). The mean K-Ar age value of Chernaya Salma biotite (six converted values) is 1820 m. y.…”

“…Converted age values of standard biotite sample from Chernaya Sales pegmatites of northern Karel ia(Afanas'yev, Kozhina, and Stank, 1960) NOTE: 1. The following constants were used in the calculations: K 4° g = 1.22 , 10 -6 .…”

“…The analytical data were published in a report on "Results of determination of the age of standard samples of muscovite, biotite, and microcline by the argon method" (Afanas'yev, Kozhina, and Stank, 1960). The minerals were analyzed in six laboratories.…”