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GSA TODAY | SEPTEMBER 2016  became widespread, and these provided a major spurt for meta-                        Cawood, P.A., Hawkesworth, C.J., and Dhuime, B., 2013, The continental
                            zoan evolution.                                                                            record and the generation of continental crust: GSA Bulletin, v. 125,
                                                                                                                       no. 1–2, p. 14–32, doi: 10.1130/B30722.1.
                              The changing thermal structure of Earth resulted in changes
                            in the properties of the lithosphere, and hence in tectonics and                     Clift, P.D., Vannucchi, P., and Morgan, J.P., 2009, Crustal redistribution, crust-
                            ultimately in surficial processes. As Earth cooled from the late                           mantle recycling and Phanerozoic evolution of the continental crust:
                            Archean (Fig. 4C), the continental and oceanic lithospheres                                Earth Science Reviews, v. 97, no. 1–4, p. 80–104, doi: 10.1016/j.earscirev
                            strengthened because they contained less melt and were charac-                             .2009.10.003.
                            terized by lower temperatures. Subduction and plate tectonics
                            caused profound changes with the onset of significant horizontal                     Condie, K.C., 1998, Episodic continental growth and supercontinents: A mantle
                            tectonics, the development of thickened mountain belts and                                 avalanche connection?: Earth and Planetary Science Letters, v. 163,
                            increased erosion, a change in crustal compositions, and the recy-                         no. 1–4, p. 97–108, doi: 10.1016/S0012-821X(98)00178-2.
                            cling of continental crust back into the mantle. Secular cooling of
                            Earth impacted lithospheric rheology, magmatic activity, and                         Condie, K.C., and Aster, R.C., 2010, Episodic zircon age spectra of orogenic
                            thickness, which in turn influenced surficial processes and                                granitoids: The supercontinent connection and continental growth:
                            features. Secular changes in the rheology of the lithosphere deter-                        Precambrian Research, v. 180, no. 3–4, p. 227–236, doi: 10.1016/
                            mine how it behaves in terms of global tectonics, the magmas                               j.precamres.2010.03.008.
                            generated, and the differential preservation of rocks generated in
                            different settings that have shaped the geological record.                           Condie, K.C., and Kröner, A., 2013, The building blocks of continental crust:
                                                                                                                       Evidence for a major change in the tectonic setting of continental growth
                            ACKNOWLEDGMENTS                                                                            at the end of the Archean: Gondwana Research, v. 23, no. 2, p. 394–402,
                                                                                                                       doi: 10.1016/j.gr.2011.09.011.
                               We thank the Natural Environment Research Council (grants NE/
                            J021822/1 and NE/K008862/1) for funding, and Mike Brown, Adrian                      Condie, K.C., Bickford, M.E., Aster, R.C., Belousova, E., and Scholl, D.W., 2011,
                            Lenardic, and Brendan Murphy for their detailed and helpful reviews.                       Episodic zircon ages, Hf isotopic composition, and the preservation rate of
                                                                                                                       continental crust: GSA Bulletin, v. 123, no. 5–6, p. 951–957, doi: 10.1130/
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