Crust and oceans, atmosphere and continents: A new paradigm for the Hadean Earth

Details Crust and oceans, atmosphere and continents: A new paradigm for the Hadean Earth Crust and oceans, atmosphere and continents: A new paradigm for the Hadean Earth

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.v22c..01t&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #V22C-01

Physics

1060 Planetary Geochemistry (5405, 5410, 5704, 5709, 6005, 6008), 1212 Earth'S Interior: Composition And State (7207, 7208, 8105, 8124), 1213 Earth'S Interior: Dynamics (1507, 7207, 7208, 8115, 8120), 3630 Experimental Mineralogy And Petrology, 8125 Evolution Of The Earth (0325)

Scientific paper

We report zircon oxygen isotope data (δ18Ozircon vs. VSMOW) and reconnaissance Ti-in- zircon concentrations ([Ti]zircon), guided by cathodoluminescence image studies, for detrital zircons up to 4.34 Gyr old from the Narryer Gneiss Complex of Western Australia. Zircon oxygen isotope results bolster the view that some Hadean ({>}3.85 Ga) zircon source melts were enriched in heavy oxygen, a sensitive proxy for contamination by anatectic sediments. Empirical studies show that zircon crystallization temperatures correlate to Ti concentration; our results on a subset of pre-3.8 Ga zircons indicate Hadean zircon core crystallization temperatures are around 680°C in all cases except for one 4.0 Ga grain which yielded temperatures (586-623°C; 3 spots) reconcilable with a sub-solidus origin. Elevated δ18Ozircon values reported here and elsewhere, combined with low minimum-melt crystallization temperature, provide mutually consistent lines of evidence that the Hadean Earth supported an evolved rock cycle which included formation of granitic water-saturated melts, extensive continental crust, hydrosphere- lithosphere interactions and sediment recycling within the first 150 million years of planet formation.

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