Here's the question:
(b) Fig. 1 is a Sm-Nd isochron plot of the orthopyroxene mineral that makes up the bulk of the meteorite ALH84001.
(i) Determine the slope of the isochron.
(ii) Thus calculate the age of the meteorite. The constant for the decay of 147Sm, λ = 6.54 x 10-12yr-1.
This is my answer:
Spoiler
(i) Slope = rise/run
= (0.518-0.51)/(0.4-0.12)
= 0.008/0.28
= 0.029
(ii) t = ln(m+1)/λ
= ln(0.029+1)/6.54*10-12
= 0.02859/6.54*10-12
= 175*106 years
= (0.518-0.51)/(0.4-0.12)
= 0.008/0.28
= 0.029
(ii) t = ln(m+1)/λ
= ln(0.029+1)/6.54*10-12
= 0.02859/6.54*10-12
= 175*106 years
Regards
Graeme