Yoshitaka Kakuwa

Meiji University

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Ryo Matsumoto

Meiji University

Mohamad Hosein Mahmudy Gharaie

Ferdowsi University of Mashhad

Takeshi Oi

Meiji University

Glen Snyder

Meiji University

Hitoshi Tomaru

Chiba University

Akihiro Hiruta

Meiji University

Hideaki Machiyama

Japan Agency for Marine-Earth Science and Technology

Yoshihiro Kakizaki

Meiji University

Naoto Ishida

Meiji University

Yutaka Yanagimoto

Meiji University

Cooperative Institutions

The University of Tokyo

Tokyo University of Science

National Institute of Advanced Industrial Science and Technology

Meiji University

Kyoto University

Rice University

Tokyo Kasei Gakuin University

Tokyo University of Marine Science and Technology

Geological Survey of Japan

Planetary Science Institute

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113. Stratigraphy and variations in carbon isotopic composition and chemical composition across the Precambrain/Cambrian boundary in Elburz Mountains, North Iran.

Annual Meeting of the Geological Society of Japan (1995)

Hiroto Kimura Ryo Matsumoto Yoshitaka Kakuwa Hamido Bahaeddin

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Citations (0)

Cone penetration tests at shallow gas hydrate exploration sites in 2015

Japan Geoscience Union (2016)

Takao Ebinuma Syu Kyouno Yoshitaka Kakuwa Ryo Matsumoto

Clathrate hydrate

Penetration (warfare)

Cone penetration test

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Early Silurian actinocerid and orthocerid cephalopods from the Kerman area, East-Central Iran.

Paleontological Research (1999)

Shuji Niko Yoshitaka Kakuwa Daisuke Watanabe Ryo Matsumoto

10.2517/prpsj.3.41

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Citations (5)

日本海東縁における堆積物コアからのイカアイトの発見とその意義

The Journal of the Geological Society of Japan (2019)

Yoshitaka Kakuwa Naizhong Zhang Ryo Matsumoto Hitoshi Tomaru Naoto Ishida

低温で安定な炭酸塩鉱物であるイカアイトが,日本海東縁部で採取した堆積物コアから発見された.イカアイトを伴う堆積物は,シルトか砂の葉理を伴う暗色の泥からなり,生痕があるか無構造である.粒状の集合体が脈となっている場合と,最大10cmを越える長さの大型の結晶をなす場合がある.イカアイトは現在の海底面下10mより浅い部分で発見されているが,間隙水の分析から,硫酸塩・メタン漸移帯(SMT)の内部,多分2mから5m程度の深さで形成されたと考えるのが妥当である.イカアイトの炭素同位体比の分析値からは,微生物によるメタン酸化に起源をもつ軽い炭素の影響が,今回発見されたイカアイトにあったことを示唆し,SMT内で形成されたことと矛盾しない.イカアイトの最新の形成年代は9,700年前以降である.大型結晶のイカアイトは,メタン流量が増大するか,70m程度埋没することで地温が上昇して不安定となり,方解石に交代され,玄能石になるだろう.

10.5575/geosoc.2019.0034

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Citations (3)

Evolution of Cambrian to Ordovician trace fossils in pelagic deep-sea chert, Australia

Australian Journal of Earth Sciences (2010)

Yoshitaka Kakuwa John A. Webb

Cambrian to Ordovician pelagic radiolarian cherts in the Lachlan Fold Belt in southeastern Australia contain trace fossils demonstrating the faunal diversification that occurred during the Ordovician on the deep-sea floor. The Cambro-Ordovician Howqua Chert has a very low degree of bioturbation, and the trace fossils are small and shallow. In contrast, the late Middle to Late Ordovician cherts are strongly bioturbated with larger, deeper burrows, and contain more morphologically diverse trace fossils. This records a substantial increase in the size, abundance and activity of deep-ocean benthic animals living on the floor of the ocean bordering Australia.

Bioturbation

Pelagic sediment

10.1080/08120099.2010.494766

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Citations (12)

Late Devonian facies variety in Iran: volcanism as a possible trigger of the environmental perturbation near the Frasnian-Famennian boundary

Geological Quarterly (2004)

Mohammad Hosein Mahmudy Ghara Ryo Matsumoto Yoshitaka Kakuwa Paul Milroy

Upper Devonian successions surrounding the Frasnian-Famennian (F-F) boundary in Iran consist of mixed carbonate/silisiclastic deposits. The successions are characterized by conspicuous ferruginous limestones, clay-rich units, black shales, and mafic volcanic rocks that provide important insights into palaeoenvironmental conditions during this interval of Earth's history. An increase of kaolinite/illite ratio in clays associated with the F-F boundary suggests that increased chemical weathering was facilitated by warm and humid climatic conditions. Distinctive ferruginous-oolite deposits overlying the crucial Frasnian-Famennian boundary interval indicate a high supply rate of Fe-bearing clay originated during enhanced weathering under such climatic conditions. Black shales associated with the F-F boundary are interpreted to be the result of a high primary productivity caused by an increased influx of land-derived nutrients and regional volcanic activity. Widespread rift-related, basaltic activity along eastern Laurussia and northern Gondwana during the mid-Late Devonian is believed to have contribution to this global warming surrounding the F-F boundary.

Late Devonian extinction

Devonian

Flood basalt

Diachronous

Paleosol

Illite

Conodont

Large igneous province

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Verification and recovery of thick deposits of massive gas hydrate from chimney structures, eastern margin of Japan Sea

AGU Fall Meeting Abstracts (2016)

Ryo Matsumoto Yoshitaka Kakuwa Glen Snyder Mamoru Tanahashi Yutaka Yanagimoto

Chimney (locomotive)

Clathrate hydrate

Margin (machine learning)

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Citations (1)

Late Devonian facies variety in Iran: volcanism as a possible trigger of the environmental perturbation

Mohamad Hosein Mahmudy Gharaie Ryo Matsumoto Yoshitaka Kakuwa Paul Milroy

Devonian

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Permian-Triassic mass extinction event recorded in bedded chert sequence in southwest Japan

Palaeogeography Palaeoclimatology Palaeoecology (1996)

Yoshitaka Kakuwa

Early Triassic

Permian–Triassic extinction event

Lithology

10.1016/0031-0182(95)00070-4

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Citations (84)

Description of sediments recovered during the cruise of MD179 in the Japan Sea,

Journal of the Japanese Association for Petroleum Technology (2013)

Yoshitaka Kakuwa Takeshi Nakajima Fujio Kumon Ryo Matsumoto Yuya Nakamura

Several long piston and gravity cores of the Japan Sea sediment are recovered during the cruise of the R/V Marione Dufresne in 2010 (MD179). Fundamental core description is presented here to share common information of the collected sediments that will be served for various analytical studies. In addition to the description on-board, detailed observation is performed by the images of the multi-scanner and the X-ray CT scanner.The recovered sediments are mainly consists of alternated dark- and light-colored silty mud with intercalations of tephras and sand laminations in some cores. Dark layers are commonly associated with fine parallel laminations that is traditionally called thinly laminated (TL) layer. The TL layers have been used both in estimating the change in paleooxygenation of the bottom of the Japan Sea and in making correlation with other cores. The observed TL layers in the cores are numbered following some of the foregoing papers depending on the identified tephras. The identified TL layers are described briefly.

Piston (optics)

Sediment core

10.3720/japt.78.97

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Citations (8)