Constraints on Hadean zircon protoliths from oxygen isotopes, Ti-thermometry, and rare earth elements one of the coauthors of this paper is named "Dustin Trail"!
Oxygen-isotope evidence from ancient zircons for liquid water at the Earth's surface 4,300 Myr ago
4.4 billion years of crustal maturation: oxygen isotope ratios of magmatic zircon
Here's a nice summary as of July 2007:GEOLOGY: Early Earth Mirrored in Zircon
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