Expedition 358 summary

Tobin, H. J.; Hirose, Takehiro; Ikari, Matt J.; Kanagawa, Kyuichi; Kimura, Gaku; Kinoshita, M.; Kitajima, H.; Saffer, D. M.; Yamaguchi, Asuka; Eguchi, N.; Maeda, Lena; Toczko, S.; Bedford, Jonathan; Chiyonobu, Shun; Colson, T.A.; Conin, Marianne; Cornard, Pauline; Dielforder, Armin; Doan, Mai‐Linh; Dutilleul, Jade; Faulkner, D.; Fukuchi, Rina; Guèrin, G.; Hamada, Yohei; Hamahashi, Mari; Hong, Wei‐Li; Ijiri, Akira; Jaeger, D.; Jeppson, T.; Jin, Zhaoyu; John, B. E.; Kitamura, Mitsutaka; Kopf, Achim J; Masuda, Harue; Matsuoka, Atsushi; Moore, G. F.; Otsubo, Makoto; Regalla, Christine; Sakaguchi, Arito; Sample, J. C.; Schleicher, Anja M.; Sone, H.; Stanislowski, K.; Strasser, Michael; Toki, Takahiro; Tsuji, Takeshi; Ujiie, Kohtaro; Underwood, Michael B.; Yabe, Suguru; Yamamoto, Yuzuru; Zhang, J.; Yukitoshi, Sanada; Kido, Yukari; Ber, E. Le; Saito, S.

doi:10.14379/iodp.proc.358.101.2020

Cited by 13 publications

(7 citation statements)

References 14 publications

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“…Hole C0002Q began at 0645 h on 18 November 2018 when the kick-off BHA began opening a new hole from 4867 m BRT. A number of stalls and overpulls occurred while drilling ahead, but the drill string was always recovered (see Table T1 in the Expedition 358 summary chapter [Tobin et al, 2020a]). At 1145 h on 18 November, a series of surveys to track azimuth and inclination started at 4879 m BRT.…”

Section: Hole C0002qmentioning

confidence: 99%

“…On 15 December 2018, preparations to run in the hole with a new whipstock began. The EZSV bridge plug was run in by wireline and set at 4783.5 m BRT by 0645 h on 16 December (see Table T2 in the Expedition 358 summary chapter [Tobin et al, 2020a]). After successfully conducting a casing pressure test, the new whipstock was run in the hole at 1030 h on 16 December and was set at 4766 m BRT by 0945 h on 17 December.…”

Section: Hole C0002rmentioning

confidence: 99%

“…International Ocean Discovery Program (IODP) Expedition 358 began on 7 October 2018 in the port of Shimizu, Japan, and the D/V Chikyu left on 10 October en route for Site C0002. Chikyu paused 2.5 days at the entrance of Suruga Bay to test the small-diameter rotary core barrel (SD-RCB) and rotary core barrel (RCB) assembly (see Table T2 in the Expedition 358 summary chapter [Tobin et al, 2020a]). After completion, Chikyu continued on to Site C0002, arriving on 13 October (see OPERATION in Supplementary material for the daily morning reports).…”

Section: Introduction and Operationsmentioning

confidence: 99%

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Site C0002

Kitajima¹,

Hirose²,

Ikari³

et al. 2020

Proceedings of the International Ocean Discovery Program

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Section: Hole C0002qmentioning

confidence: 99%

Section: Hole C0002rmentioning

confidence: 99%

Section: Introduction and Operationsmentioning

confidence: 99%

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Site C0002

Kitajima¹,

Hirose²,

Ikari³

et al. 2020

Proceedings of the International Ocean Discovery Program

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“…The Zenisu Fan is thought to be a tuffaceous gravity flow produced by the Izu-Honshu collision zone (Underwood and Guo 2018). Along the Kumano transect, the Zenisu Fan sediments are called Figure F2A of Tobin et al (2020) the Middle Shikoku Basin (MSB) sediments, and sediments above and below this unit are called the Upper and Lower Shikoku Basin (USB and LSB) sediments, respectively.…”

Section: Tectonic Setting and Datamentioning

confidence: 99%

“…7 due to poor data condition. c A seismic profile around incoming sites after Figure F2 Figure F7 of Tobin et al (2020). Symbols are the same as in Fig.…”

Section: Toe Sitesmentioning

confidence: 99%

A new method for the empirical conversion of logging data to clay mineral fraction in the Nankai accretionary prism

Yabe

Fukuchi

Hamada

et al. 2020

Earth Planets Space

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Sediment lithology, especially the clay mineral fraction, is basic geologic information, which is important for understanding faulting and evolutionary process of the accretionary prism. During scientific drilling, the clay mineral fraction is measured using X-ray diffraction analyses of samples from the acquired cores. However, coring in an accretionary prism is sometimes difficult, which hinders the acquisition of clay mineral fraction data. This study details the development of a new method used to empirically estimate the clay mineral fraction from the electrical resistivity and natural gamma ray logs obtained from the Kumano section of the Nankai Tough, where multiple scientific drilling expeditions have been conducted. This method is composed of two steps. First, porosity is estimated using electrical resistivity logs. In order to compensate for the effect of porosity, the natural gamma ray logs are then normalized using (1 − porosity). Second, the normalized natural gamma ray logs are converted into clay mineral fractions using an empirical conversion function. This empirical function was determined by comparing all available normalized natural gamma ray logs and clay mineral fractions data collected from the Kumano section of the Nankai Trough. As a byproduct of the porosity estimations, thermal conductivity and temperature depth profiles were also estimated for all of the logging sites. As electrical resistivity logs and natural gamma ray logs are essential measurements made during scientific drilling, this new method can be applied to future drilling expeditions in the Nankai Trough. Although the empirical conversion function established in this study is valid only at the Kumano section of the Nankai trough, the same procedure can be applicable to other subduction zones to establish local empirical conversion functions if enough data are available. The clay mineral fraction depth profile estimated using this method can provide useful information for various geological studies, including sedimentology and structural geology of the shallow accretionary prism.

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