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北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
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Title: 北海道における地殻,上部マントルの熱的構造:総合報告
Other Titles: Geothermal structure of the crust and the upper mantle in Hokkaido, Japan: A review
Authors: 西田, 泰典1 Browse this author
橋本, 武志2 Browse this author
Authors(alt): NISHIDA, Yasunori1
Issue Date: 15-Mar-2007
Publisher: 北海道大学大学院理学研究院自然史科学部門(地球物理学)
Journal Title: 北海道大学地球物理学研究報告
Journal Title(alt): Geophysical bulletin of Hokkaido University
Volume: 70
Start Page: 1
End Page: 12
Abstract: Many researchers have studied the thermal state of the crust and the upper mantle and its tectonic implications in Hokkaido, Japan. Terrestrial heat flow data have revealed the following characteristic features: (1) High heat flow (84〜125 mW/m2) is observed in the backarc side of the volcanic front, while low heat flow (< 42 mW/m2) is observed in the forearc side, showing the typical thermal aspects of the island arc. (2) The central axis zone of Hokkaido (the Kamuikotan and Hidaka metamorphic belts) shows relatively low heat flow (42〜80 mW/m2). The low heat flow zone extends for Sakhalin. (3) Extremely low (25〜34 mW/m2) and high (125 〜210 mW/m2) heat flow is distributed locally on the Ishikari-Tomakomai low land and its neighbor on the west, respectively. Based on the heat flow data and other geophysical data, such as the seismic velocity structure, aeromagnetic data, and so on, the Curie point depth, the solidus temperature depth, temperature at the Moho, and the mantle heat flow have been estimated. The estimated thermal structure implies the temperature of the lower crust comes to the solidus temperature beneath the backarc side of Hokkaido. The result is well supported by the electrical resistivity soundings: the low resistive layer (10~40 ohm-m) develops in the lower crust and is ascribed to the effect of partial melting of the crustal rocks.
Type: bulletin (article)
Appears in Collections:北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第70号

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