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Figure 2.
(A) Average Th/Yb (crustal input proxy); (B) εHf (crustal input proxy; note axis reversal);
and (C) Yb/Gd (crustal thickness proxy) with their 95% confidence envelopes determined by Monte Carlo
bootstrap resampling of zircons in 0.1-Gyr time brackets compared to normalized marine
87Sr/86Sr evolution. εHf data from Puetz and Condie (2019). Age of
“boring billion” from Holland (2006). UHP—ultrahigh-pressure.
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