TY - CHAP
T1 - Thermal fluid migration in the Kumano forearc basin, Nankai Trough, estimated via vitrinite reflectance measurement
AU - Kawabata, Kuniyo
AU - Sakguchi, Arito
AU - Hamada, Yohei
AU - Tsuji, Takeshi
AU - Kitamura, Yujin
AU - Saito, Saneatsu
N1 - Funding Information:
This research used data provided by R/V Chikyu cruises during NanTroSEIZE Stages 1 and 2 of the Integrated Ocean Drilling Program. We would like to thank the scientists of Expedition 319, the operation staff of Chikyu, and the onboard laboratory technicians for obtaining samples and data. In particular, thanks go to David M. Bucks, Natalia Efimenko, and Anja Schleicher for discussions on the use of drill cuttings. We greatly appreciate the input of reviewer Nicholas W. Hayman, an anonymous reviewer, Associate Editor Kohtaro Ujiie, and Science Editor Timothy B. Byrne. Their helpful suggestions and comments greatly improved the manuscript. This research was conducted with the support of a postdoctoral fellowship at Taiwan National Central University and a Japan Society for the Promotion of Science (JSPS) postdoctoral fellowship at Kagoshima University. This work was also partially funded by a Grant-in-Aid for JSPS Research Fellows and Grant-in-Aid for Young Scientists (B).
Publisher Copyright:
© 2018 The Geological Society of America.
PY - 2018/8/15
Y1 - 2018/8/15
N2 - 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.
AB - 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.
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U2 - 10.1130/2018.2534(09)
DO - 10.1130/2018.2534(09)
M3 - Chapter
AN - SCOPUS:85054928946
T3 - Special Paper of the Geological Society of America
SP - 141
EP - 154
BT - Special Paper of the Geological Society of America
PB - Geological Society of America
ER -