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Models that envisage successful subduction channel transport of upper crustalmaterials below 300 km depth, past a critical phase transition in buoyantcrustal lithologies, are capable of accumulating and assembling these materialsinto so-called "second continents" that are gravitationally stabilized at thebase of the Transition Zone, at some 600 to 700 km depth. Global scale,Pacific-type subduction (ocean-ocean and ocean-continent convergence), whichlead to super continent assembly, were hypothesized to produce secondcontinents that scale to about the size of Australia, with continental uppercrustal concentration levels of radiogenic power. Seismological techniques areincapable of imaging these second continents because of their negligibledifference in seismic wave velocities with the surrounding mantle. We can imagethe geoneutrino flux linked to the radioactive decays in these secondcontinents with land and/or ocean-based detectors. We present predictions ofthe geoneutrino flux of second continents, assuming different scaled models andwe discuss the potential of current and future neutrino experiments to discoveror constrain second continents. The power emissions from second continents wereproposed to be drivers of super continental cycles. Thus, testing models forthe existence of second continents will place constraints on mantle and platedynamics when using land and ocean-based geoneutrino detectors deployed atstrategic locations.

Testing a proposed "second continent" beneath eastern China using geoneutrino measurements