[IGPP Everyone] [EPSS Everyone] Reminder: Geocheminar in 10 min

[T. Mark Harrison]

> *High-Silica Hadean Crust*
>
> Patrick Boehnke (University of Chicago)
>
> Understanding Hadean (>4 Ga) Earth requires knowledge of its crust. The
> composition of the crust and volatiles migrating through it directly
> influence the makeup of the atmosphere, the composition of seawater, and
> nutrient availability. Despite its importance, there is little known and
> less agreed upon regarding the nature of the Hadean crust. Analyzing the
> 87Sr/86Sr ratio of apatite inclusions in Archean zircons from Nuvvuagittuq,
> Canada, using the unique CHILI instrument shows that its protolith had
> formed a high (>1) Rb/Sr ratio reservoir by ~4.4 Ga. This result implies
> that the early crust had a broad range of igneous rocks, extending from
> mafic to highly silicic compositions.
>
>
>
> --
> Mark Harrison
> Distinguished Professor
> Department of Earth, Planetary and Space Sciences
> University of California, Los Angeles
>
>


-- 
Mark Harrison
Distinguished Professor
Department of Earth, Planetary and Space Sciences
University of California, Los Angeles
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