[SIT25-12] Volatile cycle across the Earth-like planet – Impact to plate tectonics and climate
Keywords:Plate tectonics, Volatile Cycle, Climate, Habitability
The main findings are as follows: 1. The plate tectonics is likely to be initiated around 1.5 to 3 Ga to explain the reasonable scenario of the water cycling that may reveal the present-day volume of the surface seawater. The total amount of water in the planetary system would be around ten times as much as the present-day volume of the surface seawater, and the silicate mantle may have a few Ocean mass initially. However, the expected subduction flux may be an order of magnitude larger than that constrained by the water solubility experiments (Iwamori, 2007) and sea-level change associated with the tectonic plate (Karlson et al., 2019). 2. For the climate evolution, the stable climate so that may allow the planet to have the liquid water is found when the plate tectonics is successfully operated, but the snowball limit cycle solution is found when the plate tectonics is not operated (Stagnant lid planet). As a consequence, the volcanic activities (i.e., the volcanic outgassing) associated with the plate tectonics is essential to keep the planet warm so that the liquid water may be found, that is, the planetary surface is a habitable condition.