Hadean zircon formed due to hydrated ultramafic protocrust melting
- Borisova, Anastassia, Yu.
- Nedelec, Anne
- Zagrtdenov, Nail
- Toplis, Michael J.
- Bohrson, Wendy A.
- Safonov, Oleg G.
- Bindeman, Ilya N.
- Melnik, Oleg E.
- Pokrovski, Gleb S.
- Ceuleneer, Georges
- Jochum, Klaus Peter
- Stoll, Brigitte
- Weis, Ulrike
- Bychkov, Andrew Y.
- Gurenko, Andrey A.
DOIAbstract
International audienceHadean zircons, from the Jack Hills (JHZ) and other localities, are currently the only window into the earliest terrestrial felsic crust, whose formation remains enigmatic. Based upon new experimental results, generation of such early crust has been hypothesized to involve the partial melting of hydrated peridotite interacting with basaltic melt at low pressure (<10 km), but it has yet to be demonstrated that such liquids can indeed crystallize zircons comparable to JHZ. Thermodynamic and geochemical modeling are used here to test this hypothesis. The predicted zircon saturation temperatures of <750°C together with the model zircon Th, U, Nb, Hf, Y and rare-earth element (REE) contents at 700°C, δ18OVSMOW signatures an...
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