Member

Doctoral candidates (D1)
TAKAMASA Asako
Target Tungsten
Room Earthquake Research Institute 2-429
Tel +81 35841 8256
Fax +81 35802 3391
E-mail takamasa (@eri.u-tokyo.ac.jp)


■ About Study

Master Thesis

2007: M. Sc. (Earth Science), The University of Tokyo
Title
"Tungsten Isotopic Compositions of Pacific Ocean Island and an Oceanic Plateau : in search for the Core-Mantle Interaction"
Abstract
Abstract.pdf


Graduate Thesis

2004: B. Sc. (Earth Science), Yamagata University
Title
"U-Pb dating of zircons in gneisses from the Mt.Riiser-Larsen area, Napier Complex, East Antarctica"
Abstract
The Napier Complex, East Antarctica, is characterized by ultrahigh-temperature (UHT) metamorphism. To reveal the thermal history of UHT metamorphism from zircons in felsic gneisses from Mt.Riiser-Larsen area in the Napier Complex, dating by the chemical Th-U total-Pb isochron method (CHIME) and a laser ablation-inductively coupled plasma mass spectrometer (LA/ICP-MS). Firstly, I developed analytical procedure of CHIME method using an Electron Probe Micro Analyzer (EPMA) in Yamagata University. CHIME ages of zircons from Mt.Riiser-Larsen samples were reported by Hokada (1999), Hokada et al. (2004) and Suzuki (2000). These ages corresponded with the CHIME age based on our analytical conditions. It is supposed that our analytical procedure for CHIME method was a reasonable suggestion. Secondary, I measured CHIME ages and U-Pb ages by LA/ICP-MS from zircons in felsic gneisses from Mt. Riiser-Larsen. Zircons which are seem to be affected by metamorphic crystallization yields 2.36-2.46 Ga. Further, ages of metamorphic domain within the zircon grain from osumilite-garnet-orthopyroxene bearing paragneiss was also ca.2.35 Ga and zircon in garnet felsic gneisses was ca.2.42 Ga. On the other hand, protolith (origin rocks) ages were obtained by osumilite-garnet-orthopyroxene bearing pragneiss. Both U-Pb age by LA/ICP-MS and CHIME age were ca. 2.78 Ga.


Research Interests:

・ Mantle convection and the evolution of the earth
・ Isotope geochemistry of heavy elements
・ Isotope geochemistry of evolution of life (Astrobiology)
・ Social useing of isotopic tracer


■ BIOGRAPHY

Fellowship

・ 2007-2010: Japan Society for the Promotion of Science Fellowship (DC1)

Membership of Academic Societies

・ Geochemical Society of Japan

Technical Experiences

・ Rare Gas(Ar) Mass Spectrometer
・ Electron Micro Probe
・ Solution ICP Mass Spectrometry
・ Laser Ablation ICP Mass Spectrometry

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