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Kogiso Lab
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A lab that reads the interior and evolution of the Earth from rocks delivered from deep within it.
AboutAbout the lab
Reading Earth's history from rocks.
Kogiso Lab aims to read the composition, dynamics, and chemical evolution of Earth's interior from the various rocks brought up from within the Earth.
Its main methods are high-pressure, high-temperature experiments and synchrotron X-ray analysis.
Undergraduate students are assigned to the Earth and Life Environment Division and work on their graduation research (for graduate students, the Earth and Life Environment Division of the Department of Human and Environmental Studies, Graduate School of Human and Environmental Studies).
Key terms
- mantle
- The rock layer below Earth's crust and above the core. It makes up most of Earth's volume.
- highly siderophile elements
- Elements such as platinum and osmium that readily bond strongly with iron. They are clues to the evolution of Earth's core and interior.
- xenolith
- A fragment of surrounding rock that magma picks up and carries with it as it rises from deep underground.
NewsLab news
Lab paper published in Scientific Reports
Master's student wins Outstanding Student Presentation Award at the Annual Meeting of the Geological Society of Japan
ResearchResearch themes
The lab studies igneous rocks and mantle rocks using high-pressure, high-temperature experiments and synchrotron X-ray analysis to investigate the composition and evolution of Earth's interior.
*Illustrative imageReading Earth's evolution from highly siderophile elements
The lab searches peridotite for minerals containing highly siderophile elements through microscale analysis, and uses the mantle concentrations of these elements to investigate the evolution of materials in Earth's interior. It also explores material differentiation in the magma ocean at the time of Earth's formation.
*Illustrative imageMaterial cycling in Earth's interior
From the isotopic composition of ocean island basalts, the lab investigates the timescale of mantle convection, and from peridotite xenoliths found on oceanic islands, it clarifies how convection occurs in the uppermost mantle.
MembersFaculty
The members of Kogiso Lab are faculty and master's students.As of 2026
- ProfessorTetsu Kogiso
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Peridotite 5773” HAROUY Jean-Michel / CC BY-SA 4.0 (cropped)
- Reading Earth's evolution from highly siderophile elements: “Violet dot” Strekeisen / CC BY-SA 4.0 (cropped)
- Material cycling in Earth's interior: “Basalt Columns at Rochester Falls in Mauritius” laurence comte http://www.geodiversite.net/auteur131 / CC BY-SA 3.0 (cropped)
- Related lab (Solid Earth Science (Mamoru Kato) Lab): “Seismogram on historical seismometer at Institute of Geophysis of the Czech Academy of Science (19)” Petr Brož (Czech Academy of Science) / CC BY-SA 4.0 (cropped)
- Related lab (Environmental Earth Science Lab): “Fish otolith on sectioning saw - USGS” Dona Eidam/USGS / CC BY-SA 3.0 (cropped)
- Related lab (Tanabe Lab): “Glow In The Dark D20 Dice” Dark Elf Dice / CC BY-SA 4.0 (cropped)
- Related lab (Yoshida Lab (Hisao Yoshida)): “TiO2Photocatalysis” Ibhadon AO, Fitzpatrick P. / CC BY-SA 3.0 (cropped)
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