Influence of seawater-rock interaction on global cycle

点击翻译按钮获取中文摘要

Important results obtained by this project can be summarized as follows.(1) Geochemical characteristic features of carbonates at Miocene back arc basins (Green tuff region in Japan) were elucidated. These data indicate that the formation of carbonates affects the oceanic and atmospheric environments at that time.(2) The concentrations of carbon dioxide in hydrothermal solutions from back arc basins and island arcs and fluxes from such tectonic setting are large.(3) Global carbon cycle simulations including hydrothermal and volcasic gas fluxes from concergant plate boundary can explain warming at early and Middle Miocene but cannot cooling from Middle Miocene toward present.(4) This results suggest that the cooling has not been caused by up lift of Himalaya weathering and hydrothermal activity.