Distribution of U/Pb zircon ages in granitoids and detrital zircons since 4.5 Ga (from Condie and Aster, 2010). The vertical sample count axis is the number of samples as a function of time for a Gaussian kernel bandwidth of three standard deviations (30 m.y.). The multiple lines in each spectrum represent error bounds of one standard deviation and their tightness confirms the robustness of the major peak clusters in the various sample distributions. Supercontinent history is also summarized on the figure.
Relative abundances of continental arc, oceanic terrane and reworked crust petrotectonic assemblages in orogens. Data from Supplementary Appendix 1. Details of data compilation are given in Condie (1993, 2007) and Condie and Chomiak (1996).
Relative abundances of juvenile crust in orogens grouped by tectonic setting. Data from Supplementary Appendix 1. Details of data compilation are given in Condie (1993, 2007) and Condie and Chomiak (1996).
εHf for detrital zircons and εNd for whole-rock sediments and granitoids with increasing age. εHf and εNd are median values from our combined Hf and Nd database (Condie and Aster, 2013; latest update of Nd isotopic data given in Supplementary Appendix 2). Trends are displayed as the median value within a 100 m.y. time window stepping in m.y. increments. Also shown are assembly and breakup times of supercontinents (Condie and Aster, 2010). Points are median ε values for assembly and breakup time windows; vertical black bar is one standard deviation.
Hafnium and Nd model age distributions with age. (a) Hf isotope model ages of detrital zircons from modern river sediments; (b) Hf model ages from (a) that have δ18O in the range 4.5–6.5‰; and (c) Nd isotopic model ages for whole-rock detrital sedimentary rocks and granitoids (data from Condie, 2013); (d) histogram of Re depletion ages in mantle xenoliths (data from Carlson et al., 2005; Pearson et al., 2007).