Lead Isotope Variation with Growth Zoning in a Galena Crystal.
A large crystal of lead sulfide from Picher, Oklahoma, has significant differences in isotopic composition of lead in successive growth zones. Lead isotope ratios in the parent ore-fluid evidently changed with time during crystal growth. The growth history of this crystal, interpreted quantitatively, points to a tentative hypothesis of genesis of Mississippi Valley deposits of lead and zinc.
Cannon
R S
RS
Pierce
A P
AP
Delevaux
M H
MH