Question

Fission Track Dating Constants: λ"-1.55 125 x 10"。у'. Af = 8.46 × 10.17 yı:o-580.2 x 10'24 cm2. 235Upsv- 1/137.88 2. Church and Bickford (1971, Geol. Soc. Amer. Bul., 82:1727-1734) analyzed an apatite in the granite of the Sawatch Range of Colorado. The granite has a whole-rock Rb-Sr date of 1650 x 10 years. The rock sample from which the apatite was taken yielded a Rb-Sr mineral- isochron date of 1275x 106 years. The analytical results for the apatite (A38G-II, 4) are as follows: p, 20 tracks 0. I mm, ρί-580 tracks/0. I mm. φ date and interpret the result. 2.5 x 1016 n cm. Calculate a fission-track

Answer 1

Date Eission Tnck Dalut ha :5512 mm2 2 드 5802-X10 -23 238 u :37、88 , 儿 h fiston Track Date equatio Pi ofpentanebus CNatural ) fission areal

Af heCenstant in th 58 0 ラ 58¢ 58 re6 ano on-Lat 0.814 6551724 13 X 10.2. ,6491021 L1 +0.008146551424 | 三4u2x102x_0:0081135426の64