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Umeda, Koji; Sakagawa, Yukihiro*; Ninomiya, Atsushi; Asamori, Koichi
Geophysical Research Letters, 34(5), p.L05310_1 - L05310_5, 2007/03
Times Cited Count：21 Percentile：48.72(Geosciences, Multidisciplinary)In order to examine the potential correlation between heat and helium isotope signatures in a non-volcanic region, we estimated the local heat flux using Peclet number analysis of thermal profile from deep boreholes in the Kii Peninsula, Southwest Japan. There is a distinct correlation between the common logarithms of 
He/
He ratio and heat flux. Here heat flux values higher than 90 mW/m
are estimated from the deep boreholes and the upward flow of deep fluids predominates over the groundwater recharge of the local hydrology. These results support the recently proposed source model that shows that the high temperature hot springs with significantly higher He/He ratio in the Kii Peninsula originate due to the effective transfer of mantle helium and heat from the subcrustal lithosphere by aqueous fluids generated by dehydration of the subducting Philippine Sea slab.
Sakagawa, Yukihiro; Umeda, Koji; Asamori, Koichi
Nihon Chinetsu Gakkai-Shi, 28(2), p.211 - 221, 2006/04
In Japan they have extensively measured the crustal heat flow (conductive heat flux) since 1957 to make clear the heat flow distribution around Japan. On the other hand, they have not revealed the distribution of the total heat flux yet which consists of the conductive term and the advective term, and is required for investigation of heat transfer at volcano zones and so forth. Authors calculated the total heat fluxes and fluid flow velocities from data of wells in all over Japan using an one-dimensional heat transfer model to find out that in northeastern part of Japan the total heat flux is higher at Pacific side than the side of the Sea of Japan, that in southwestern part of Japan the total heat flux is lower around the Inland Sea, that the high total heat flux zones are almost confined to the vicinities of Quaternary volcanoes, that the total heat fluxes not lower than 1W/m seem to owe their growth possibly to the fast ascending fluid flows which are generated locally in the fluid convection systems by heat sources and so forth.
