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Cratonic Growth in an Accretionary Orogen: A Tale from the North China Craton - Tim Kusky

Cratonic Growth in an Accretionary Orogen: A Tale from the North China Craton Tim Kusky China University of Geosciences, Wuhan The early origins of cratons and the formation mechanism of continental crust are highly-debated, with models ranging from stagnant-lid bottom-up plume-dominated systems, to plate tectonic settings that resemble modern Earth. Here we present results from our decades of mapping in the North China craton, and summarize structural and other data that lean heavily towards accretionary plate tectonic mechanisms. Major plate tectonic indicators include low temperature eclogite facies oceanic crust, mélanges, Alpine-style nappes thrust over passive margins, paired metamorphic belts, regional orogenic zonation mimicking Phanerozoic systems, and high-to ultra-high pressure inclusion suggesting deep subduction and elemental (CHONSP) cycling before 2.5 Ga. Major events occurred during Earth’s critical intervals at the Archean/Proterozoic transition, suggesting a link between accretionary tectonics building stable environments for shallow-water life to proliferate, eventually leading to the GOE and a more-modern-style Earth, habitable by creatures we know.