Assertion: hafnium | /r/CapableOf | indicate extensive crustal reworking
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Source sentences:
text: In West Greenland, for example, a series of basement rocks show an evolution in the origin of the crust: ε Hf decreases from ~ 0 in 3.85 Ga zircon to ~−8 in 3.25 Ga zircon, indicating extensive crustal reworking, whereas zircon ε Hf becomes progressively higher from 3.25 to 2.8 Ga, indicating the generation of new crust by mantle melting (Næraa et al., 2012).