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Title:
Extinct 244Pu in Ancient Zircons
Authors:
Turner, Grenville; Harrison, T. Mark; Holland, Greg; Mojzsis, Stephen J.; Gilmour, Jamie
Affiliation:
AA(Department of Earth Sciences, University of Manchester, Manchester M13 9PL, UK.), AB(Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia; Department of Earth and Space Sciences and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095, USA), AC(Department of Earth Sciences, University of Manchester, Manchester M13 9PL, UK.), AD(Department of Geological Sciences, Center for Astrobiology, University of Colorado, Boulder, CO 80309-0399, USA), AE(Department of Earth Sciences, University of Manchester, Manchester M13 9PL, UK.)
Publication:
Science, Volume 306, Issue 5693, pp. 89-91 (2004). (Sci Homepage)
Publication Date:
10/2004
Category:
GEOCHEM PHYS
Origin:
SCIENCE
DOI:
10.1126/science.1101014
Bibliographic Code:
2004Sci...306...89T

Abstract

We have found evidence, in the form of fissiogenic xenon isotopes, for in situ decay of 244Pu in individual 4.1- to 4.2-billion-year-old zircons from the Jack Hills region of Western Australia. Because of its short half-life, 82 million years, 244Pu was extinct within 600 million years of Earth's formation. Detrital zircons are the only known relics to have survived from this period, and a study of their Pu geochemistry will allow us to date ancient metamorphic events and determine the terrestrial Pu/U ratio for comparison with the solar ratio.
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