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Science 20 February 2009:
Vol. 323. no. 5917, pp. 1017 - 1018
DOI: 10.1126/science.1169556
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Perspectives

GEOCHEMISTRY:
Making a Crust

Peter J. Michael1 and Michael J. Cheadle2

Dating zircons from the mid-Atlantic ridge provides clues about how the oceanic crust is formed.

1Department of Geosciences, University of Tulsa, Tulsa, OK 74104, USA. E-mail: E-mail: pjm{at}utulsa.edu

2Department of Geology and Geophysics, University of Wyoming, Laramie, WY 82071, USA. E-mail: cheadle{at}uwyo.edu

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