日本の花崗岩地域の高熱流量の起源について

概要

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Several heat flow values observed in the granitic rock regions of Japan show anomalously high ones amounting to 150 mW/m^2 (3.6 HFU), compared to the geologic age-heat flow dependency. As origins of such anomalously high heat flow values, the following were investigated: (1) anomalous concentration of radioactive heat elements, (2) residual heat of intrusive granitic bodies, (3) upheaval and denudation of granitic bodies, (4) deep volcanic activity in more recent ages, and (5) hydrothermal circulation in the deeper crust. As a result, the possibility of the deep volcanic activity in more recent ages is suggested. This means that even if recent volcanic activities are not observed at the surface, there may exist a high temperature state in the deeper crust and the upper mantle at present.
特定非営利活動法人日本火山学会の論文
1990-04-14