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Takei Lab
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A lab that uses experiments and theory to understand Earth's interior from the microscopic mechanisms of rocks.
AboutAbout the lab
From microscopic mechanisms to Earth's interior
Takei Lab studies the properties of rocks inside the Earth and the dynamics of Earth's interior.
Rock is a polycrystalline material made up of many mineral crystals. Under the high temperatures and pressures found inside the Earth, the behavior of atomic-scale defects governs the properties of the rock as a whole.
Through experiments on low-melting-point "analog" polycrystals combined with theory, the lab aims to explain the large-scale behavior of rocks from their microscopic mechanisms.
Key terms
- polycrystal
- A solid made up of many small crystal grains. Rock is one example.
- grain boundary
- The interface where crystal grains meet inside a polycrystal. It is only a few nanometers thick.
- asthenosphere
- The soft, easily flowing layer of the mantle beneath the rigid plates.
ResearchResearch themes
The lab aims to uncover the atomic-scale mechanisms that determine the large-scale behavior of rocks in Earth's high-temperature, high-pressure interior. Its research combines experiments on low-melting-point analog polycrystals with theory that connects the microscopic and the macroscopic.
*Illustrative imageExperiments that recreate Earth's interior at everyday temperatures
By using suitable low-melting-point analog polycrystals, the same physical mechanisms as in Earth's interior can be reproduced at conditions close to room temperature and atmospheric pressure. The lab carries out a variety of experiments that are difficult to do with real rocks and collects high-precision data.
*Illustrative imageTheory that connects the microscopic and the macroscopic
To apply experimental results to Earth's interior, the lab uses theoretical models to clarify universal mechanisms that do not depend on the material. It is developing theory that derives the laws governing the mechanical behavior of rocks from microscopic processes.
*Illustrative imageGrain boundary behavior and the structure of the mantle
Atomic diffusion and sliding at grain boundaries play an important role in the viscoelasticity of rocks. Experiments on analog polycrystals have shown that a phase transition in which grain boundaries melt is a key to understanding the seismic-wave structure of the mantle and the asthenosphere.
MembersFaculty
- ProfessorYasuko TakeiPublications ↗
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: “Olivine in polarizing light” Islam90 / CC BY-SA 4.0 (cropped)
- Experiments that recreate Earth's interior at everyday temperatures: “Thin section scan crossed polarizers Siilinjärvi R edit” kallerna / CC BY-SA 4.0 (cropped)
- Theory that connects the microscopic and the macroscopic: “Rock Deformation” Chris Light / CC BY-SA 4.0 (cropped)
- Grain boundary behavior and the structure of the mantle: “Min Oliv 20x XPL” Rygel, M.C. / CC BY-SA 4.0 (cropped)
- Related lab (Baba Lab (Ocean Hemisphere Research Center)): “Ocean Bathymetry (NESDIS Bathymetry)” NOAA / Public domain (cropped)
- Related lab (Ichihara Lab): “Stromboli Eruption” Wolfgang Beyer / CC BY-SA 3.0 (cropped)
- Related lab (Tanaka Lab): “Swiss GPS reference station SARG (Sargans) ( )” Kecko from Switzerland (Rheintal SG, the border valley between Switzerland and Austria) / CC BY 2.0 (cropped)
- Related lab (Koyama Lab): “Mount Mihara ( )” Guilhem Vellut / CC BY 2.0 (cropped)
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