Fig. 2: Plot of initial epsilon hafnium (εHf(t)) versus zircon age for Hadean and Archaean detrital zircons from the Yilgarn Craton. | Nature Communications

Fig. 2: Plot of initial epsilon hafnium (εHf(t)) versus zircon age for Hadean and Archaean detrital zircons from the Yilgarn Craton.

From: Crustal rejuvenation stabilised Earth’s first cratons

Fig. 2

Most pre-3800 Ma detrital zircons define a Hf isotopic array consistent with internal reworking of early Hadean mafic sources such as typical mid ocean ridge basalt (176Hf/177Hf = 0.026) or Hadean incompatible element enriched lunar basalt (KREEP, 176Lu/177Hf = 0.020; ref. 14.). From ~3750 Ma onwards, detrital zircon age populations define vertical εHf(t)–time groups that reflect mixing between juvenile sources and pre-existing Hadean crust. The grey dashed line defining the depleted mantle is approximately fitted through the most juvenile zircon analyses. Error bars are 2SE. CHUR chondritic uniform reservoir. Only published data collected by concurrent Pb–Hf analysis are shown3,14. A kernel density estimate curve and histogram of zircon ages (new and previously published) are shown at the bottom of the diagram. The grey bars behind the histogram correspond to the age of crust preserved in the Narryer Terrane18.

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