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

Kuniyo Kawabata, Arito Sakguchi, Yohei Hamada, Takeshi Tsuji, Yujin Kitamura, Saneatsu Saito

研究成果: Chapter in Book/Report/Conference proceedingChapter

3 被引用数 (Scopus)

抄録

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.

本文言語英語
ホスト出版物のタイトルSpecial Paper of the Geological Society of America
出版社Geological Society of America
ページ141-154
ページ数14
ISBN(電子版)9780813795348
DOI
出版ステータス出版済み - 8 15 2018

出版物シリーズ

名前Special Paper of the Geological Society of America
534
ISSN(印刷版)0072-1077

All Science Journal Classification (ASJC) codes

  • 地質学

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