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Elements
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Elements; February 2007; v. 3; no. 1; p. 31-35; DOI: 10.2113/gselements.3.1.31
© 2007 Mineralogical Society of America
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Zircon Behaviour in Deeply Subducted Rocks

Daniela Rubatto

Research School of Earth Sciences, The Australian National University, Canberra 0200, Australia
E-mail: daniela.rubatto{at}anu.edu.au

Jörg Hermann

Research School of Earth Sciences, The Australian National University, Canberra 0200, Australia

Zircon is of fundamental importance in the investigation of deeply subducted crustal rocks in which it is a trace constituent. Tiny mineral inclusions within zircon may be the only indicators that rocks were subducted to a depth of up to 150 km. Because zircon is resistant to physical and chemical changes, it preserves stages of the subduction and exhumation history within submillimetre-size grains. Advanced in situ techniques allow us to date zircon domains and to determine their trace element composition. We can thus acquire a detailed knowledge of the temperature-pressure-time paths that these extraordinary rocks have experienced. Zircon studies provide evidence that subduction and exhumation act at plate tectonic speeds of 1-3 cm/year.

KEYWORDS: zircon, high-pressure metamorphism, trace elements, eclogite, U-Pb geochronology




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