Episodic Precambrian subduction

  title={Episodic Precambrian subduction},
  author={A Lenardic and L. Moresi and Trond H Torsvik and C.-T. A. Lee},
The Precambrian geological record shows peak of activity at 1.1, 1.9–2.1, 2.7 and 3.5 Ga, often associated with massive crustal production, orogenesis and supercontinent cycles. It has been suggested that these bursts of tectonic activity are due to mantle avalanche events, where accumulating subducted slabs periodically penetrate the 670 km discontinuity, and subsequent upwelling counterflow and plume activity results in massive volcanism. Here we present paleomagnetic evidence for periods of… CONTINUE READING
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