Question

Question 34 3 pts A potassium feldspar mineral KAISI30g is found to contain 8.35ppm 40-K and 0.932 ppm 40-Ar. Use the equation below to determine the age of the mineral and match to the nearest value. t= ti 2 In In(2) Arf Kf + 0.109 Kf where t is the age of mineral and t1/2 for 40-K= 1.248 billion years Kfis final amount 40-K in sample Arfis final amount of 40-Ar in sample 1.3 billion years 810 million years 580 million years 2.9 billion years O 370 million years 1.8 billion years

Answer 1

0-932 ppm = t = 1.3 billion years final amount of tok, kg = 8:35ppm final amount of four, Arf dy of tok, tra |- 248 billion you Calculate the age of the mininal try kr + ta In 0-log 0.932 0.109 luz 8.35 tyy и 2. Kf 1-248 en 8.35 + () 1-248 Inal In (2-024)