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Science 1 November 1963:
Vol. 142. no. 3592, pp. 574 - 576
DOI: 10.1126/science.142.3592.574
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Articles

Lead Isotope Variation with Growth Zoning in a Galena Crystal

Ralph S. Cannon Jr. 1, Arthur P. Pierce 1, and Maryse H. Delevaux 2

1 U. S. Geological Survey, Denver 25, Colorado
2 U. S. Geological Survey, Washington 25, D. C.

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.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)