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

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Citation (Scopus)

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.

Original languageEnglish
Title of host publicationSpecial Paper of the Geological Society of America
PublisherGeological Society of America
Pages141-154
Number of pages14
ISBN (Electronic)9780813795348
DOIs
Publication statusPublished - Aug 15 2018

Publication series

NameSpecial Paper of the Geological Society of America
Volume534
ISSN (Print)0072-1077

All Science Journal Classification (ASJC) codes

  • Geology

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