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Thermal fluid migration in the Kumano forearc basin, Nankai Trough, estimated via vitrinite reflectance measurement

By
Kuniyo Kawabata
Kuniyo Kawabata
Graduate School of Science and Engineering, Kagoshima University, 1-21-30 Khorimoto, Kagoshima-city, Kagoshima, 8900065, Japan
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Arito Sakguchi
Arito Sakguchi
Department of Geosphere Sciences, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-city, Yamaguchi, 7538511, Japan
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Yohei Hamada
Yohei Hamada
Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, 200 Monobe-otsu, Nankoku-city, Kochi, 7838502, Japan
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Takeshi Tsuji
Takeshi Tsuji
Department of Earth Resources Engineering, Kyushu University, Fukuoka, 8190395, Japan, and International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka, 8190395, Japan
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Yujin Kitamura
Yujin Kitamura
Graduate School of Science and Engineering, Kagoshima University, 1-21-30 Khorimoto, Kagoshima-city, Kagoshima, 8900065, Japan
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Saneatsu Saito
Saneatsu Saito
Research and Development Center for Ocean Drilling Science, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showamachi, Kanazawa-ku, Yokohama-city, 2360001, Japan
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Publication history
30 March 201808 June 2018

ABSTRACT

This study examined the thermal history of the Kumano forearc basin, as well as slope basin sediments and the accretionary prism, in the Nankai Trough, offshore Japan, using vitrinite reflectance measurements of sediments collected from Integrated Ocean Drilling Program Sites C0004, C0007, and C0009. We detected a paleothermal anomaly in the Kumano forearc basin at Site C0009 that has a 200-m-wide peak with a maximum temperature of 79 °C, ranging from 1000 to 1200 m below seafloor (mbsf). We concluded that thermal fluid is passing through the peak zone based on a curvilinear paleotemperature structure with a wide peak zone. Estimation of reflectance increase through vitrinite reaction promotion suggests that 80–100 °C thermal fluid had passed within at least 100 k.y., thus causing the anomaly. The thermal fluid upwelling could relate to thrusts and ancient splay fault activity near Site C0009. The thermal anomaly zone in the Kumano forearc basin at Site C0009 coincides with the currently active fluid conduit zone imaged on reflection seismic profiles. These results indicate that massive fluid circulation occurs spatially and temporally through thrusts in the subduction zone.

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Contents

GSA Special Papers

Geology and Tectonics of Subduction Zones: A Tribute to Gaku Kimura

Geological Society of America
Volume
534
ISBN electronic:
9780813795348

GeoRef

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