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- W2172041128 abstract "The concept of episodicity in tectonic processes pre-dates acceptance of the plate tectonic paradigm (e.g., Umbgrove, 1940; Holmes, 1951; Sutton, 1963). It was specifi cally advocated by Wilson (1966) when he made the case that ocean basins repeatedly opened and closed, a process now known as “Wilson cycles” (Dewey and Burke, 1974). The relationship between tectonic episodicity and the supercontinent cycle was fi rst proposed by Worsley et al. (1982, 1984), who argued that episodic peaks in the number of continental collisions refl ect supercontinent amalgamation, and that episodes of rift-related mafi c dike swarms record supercontinent breakup. These authors identifi ed trends in tectonic activity, platform development, climate, life and stable isotopes that accompanied supercontinent amalgamation, breakup and dispersal (Nance et al. 2013). Although not universal (e.g., Stern, 2008), a broad consensus has emerged over the past 30 years that repeated cycles of supercontinent amalgamation and dispersal occurred since the late Archean, with profound effect on the evolution of the Earth’s geosphere, hydrosphere, atmosphere and biosphere. Statistical peaks in the age distributions of orogenic granites and detrital zircons, as well as negative e Hf excursions in zircons may match the timing of supercontinent amalgamation. As Hf is the more incompatible element, Lu/Hf is lower in the crust and higher in the depleted mantle relative to the bulk earth, and the crust therefore evolves towards negative eHf values. Whether these eHf data imply episodicity, a preservational bias, or a combination of both phenomena is debated (e.g., Roberts, 2012; Cawood et al., 2013; Nance et al., 2013). The mechanisms potentially responsible for the supercontinent" @default.
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- W2172041128 date "2013-06-28" @default.
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- W2172041128 title "Whither the supercontinent cycle?" @default.
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- W2172041128 doi "https://doi.org/10.1130/focus072013.1" @default.
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