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    Earth Material Science Lab.    Structural Geology Lab.    Isotope Geochemistry Lab.   Sedimentology Lab.   
    Petrology and Volcanology Lab.    Paleobiology Lab.    Physicochemical Mineralogy Lab.      

 

                 
 
 
 
 
  Earth Material Science Lab. : Ultra-highg pressure metamorphic rocks as clues to information of a deeper crust
   
 
 

Staff

Leader: Yoshihide Ogasawara (Prof.)

Dr. Eng. (Waseda Univ.)

Research Activities

 

Sorry, now in preparation.









 

Microdiamond from Kokchetav.
 
   
   

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  Structural Geology Lab. : Structural geology and tectonics of faults and shear zones
   
 
 

Staff

Leader: Hideo Takagi (Prof.)

Dr. Sc. (Nagoya Univ.)

Research Activities

 

The tectonic evolution of the Japanese Islands, which are located along the convergent Pacific plate boundary, is being determined through the kinematic analysis of its shear zones. The major focus of research in our laboratory is to clarify the strain and kinematic processes, the deformation conditions and deformation history of fault rocks from both the brittle and ductile regimes, at various depths from the uppermost mantle to crustal and surface conditions. Research areas extend from Hokkaido to Kyushu, and also include the Korean Peninsula, the Yunnan area of China and the Himalayas (Nepal). Reconstructions of exotic terranes, such as the Paleo-Ryoke Terrane outcropping between the Sambagawa and Ryoke Belts along the MTL is another major project which relates to the tectonic evolution of Japanese Islands.
We utilise various research methods which not only include precise field mapping and the collection of oriented rock samples to determine structural elements, but also laboratory work using BSE image and chemical analyses of minerals by EPMA, XRD analysis, observation of substructures using the electron microscope, observation of healed microcracks via cathode luminescence, and the measurement of magnetic susceptibility and isotopic dating.

マイクロクラック

Cathodoluminescence image showing healed microcracks penetrating the Nojima Granodiorite in the Ryoke Belt, Awaji Island.
Blue: K-feldspar, dark purple: quartz, yellow green: plagioclase. Dark part in the plagioclase is amphibole.
Dark veins penetrating K-feldspar are healed microcracks filled with K-feldspar.
 
   
   

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  Isotope Geochemistry (Earth and Palanetary Science) Lab.: Petrology and isotope geochemistry of rocks in diverse geologic settings
   
 
 

Staff

Leader: Timothy J. Fagan (Prof.)

Ph. D. (Univ. California, Davis)

Research Activities

I use the tools of petrology and isotope geochemistry to understand the formation and alteration of rocks in diverse geologic settings, including terrestrial metamorphic belts, lunar igneous systems, asteroids and the solar nebula (the cloud of dust and gas that surrounded the sun during earliest stages of our solar system).  Most of my recent work is on meteorites, and makes use of Al, Mg isotopes to determine the timing of alteration and O isotopes to assess the evolution of distinct oxygen reservoirs that existed in the solar nebula.

 
Allende隕石 Efremovkaコンドライト
Allende meteorite [detail]



 
Efremovka chondrite
elemental map [detail]


 
 
   
   

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  Sedimentology Lab. : Paleoenvironmental analysis using geochemical proxies in sedimentary rocks.
   
 
 

Staff

Leader: Tohru Ohta (Prof.)

Dr. Sc. (Waseda Univ.)

Research Activities

 

Sedimentary rocks record physico-chemical conditions of the Earth’s past surface environment. Therefore, analyses of sedimentary structures and geochemistry of clastic rocks enable unraveling the environmental changes of the past Earth. By analyzing such records, we tackle to reveal the sedimentary environment and paleoclimate of the Japanese Islands, and further to assess evolutional histories of the Eastern Asian region. The main analytical methods employed in our laboratory include XRF, XRD, EPMA, CL and ICP-AES analysis as well as basic geological field researches.

 
Climbing dunes within the volcanic surge deposits. The presence of climbing dune indicates that both sediment supply and velocity were high during the time of volcanic eruption (Jeju, Korea).
 
   
   

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  Petrology and Volcanology Lab. :
   
 
 

Staff

Leader: Yuki Suzuki (Assoc. Prof.)

Ph. D. (Univ. of Tokyo)

Research Activities

 

 

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Eruption at Showa crater of Sakurajima volcano (July, 2013) .  


The earliest erupted magma in the 2011, Shinmoe-dake eruption
(a fragment in Jan 19 ash).

 
   
   

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  Paleobiology Lab.: Evolutionary paleobiology and its interactions with Earth’s climate in the greenhouse Earth.

  
 
 
 

Staff

Leader: Kazuyoshi Moriya (Assoc. Prof.)

Ph. D. (Univ. of Tokyo)

Research Activities

 

The Earth has repeatedly experienced the greenhouse, icehouse, or snowball intervals within its 4.6 billion years history. The climatic oscillation shows significant variety in tempo and magnitude, which is controlled by the external forcing and internal feedbacks of the Earth’s climate system. Since approximately 35 million yeas ago, the Earth has developed continental icesheets, and we now live in the icehouse world. However, the greenhouse interval without any continental icesheet had been predominant in the long Earth’s history.
Especially, the Cretaceous and early Paleogene (app. 150 to 35 million yeas ago) have been known as the recent archetypal greenhouse interval. In this unique environment, many distinctive faunae and florae had been well diversified. In our laboratory, we investigate thermal structure and circulation of the greenhouse ocean and paleoecology of the molluscs (e.g. ammonoids) and calcareous microfossils (e.g. foraminifers) in this interval. We, then, discuss evolutional history of these animals and global climate change.
We utilize geochemical analyses of fossil materials in addition to traditional methods, such as field observations and the morphometry of fossils. Stable isotope geochemistry and organic biomarker analyses are especially important to understand the seawater temperature, and habitat and growth rate of ancient animals. With using these methods, we discuss many events having variety of temporal and spatial variation, from the tectonic and orbital scale paleoclimate to the life history of a single animal, and elucidate the interactions of paleobiodiversity and evolution with the global paleoenvironmental shifts.


 

The ammonite pavement in the lower Jurassic Blue Lias in Lyme Regis.


 

Belemunitella americana from the Pee Dee Formation, South Carolina, USA. The international reference standard for stable carbon and oxygen isotopes, PDB, was made from the same species of belemnite fossils from the Pee Dee Formation.

 
   
   

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  Physicochemical Mineralogy Lab.: Physics and chemistry of minerals
  The program of physics and chemistry of minerals is planned to be discontinued when the class of 2017 graduates.

 
 
 

Staff

Leader: Minoru Somiya (Assist. Prof.)

Dr. Eng. (Waseda Univ.)

Research Activities

 

We have been interested in the characterization of minerals (mainly silicate minerals) as well as synthetic inorganic materials by means of various classical and advanced analyses including spectroscopic probe techniques. Nanostructure (both crystalline and non-crystalline ones) and macroscopic morphology are two important spatial domains to determine the materials and their characteristics. Combining microscopies and spectroscopic techniques, hierarchy from nano to macroscopic structures of minerals and relating materials will be understood. Application of minerals for the environmental problems (concentration and decomposition of toxic compounds, mineral based hybrids as environmentally friendly materials, and energy transformation on minerals) is also a topic of our recent interest.

蛍光顕微鏡

Fluorescence microscope.
 
   
   

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