Japan Geoscience Union Meeting 2019

Presentation information

[J] Poster

M (Multidisciplinary and Interdisciplinary) » M-TT Technology & Techniques

[M-TT48] Frontiers in Geochemistry

Sun. May 26, 2019 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Hirochika Sumino(Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo), Tetsuya Yokoyama(Department of Earth and Planetary Sciences, School of Science, Tokyo Institute of Technology), Hajime Obata(Marine inorganic chemistry division, Atmosphere and Ocean Research Institute, University of Tokyo)

[MTT48-P04] In-situ and meteoric 10Be and 26Al measurements: Improved preparation and application at the University of Tokyo

*Yusuke Yokoyama1,2,3, Masako Yamane7, Atsunori Nakamura4, Yosuke Miyairi1, Kazuho Horiuchi5, Takahiro AZE1, Hiroyuki Matsuzaki6, Yoshiki Shirahama4, Yuka Ando1 (1.Atmosphere and Ocean Research Institute, University of Tokyo, 2.Department of Earth and Planetary Science, University of Tokyo, 3.Department of Biogeochemistry, Japan Agency for Marine-Earth Science and Technology, 4.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 5.Graduate School of Science and Technology, Hirosaki University, 6.Micro Analysis Laboratory, Tandem Accelerator, University of Tokyo, 7.Division for Chronological Research, Institute for Space–Earth, Environmental Research, Nagoya University)

Keywords:Cosmogenic nuclides, Accelerator Mass Spectrometry

Cosmogenic radionuclides have been widely used to decipher Earth surface processes. At the University of Tokyo Accelerator Mass Spectrometry facility (5 MV Tandem accelerator), we have been measuring both in-situ and meteoric cosmogenic 10Be and 26Al. In this presentation, we report some development of methodology, including how to prepare target samples chemically to reduce their background. We then introduce some examples using the method to provide further insights into earth surface processes. These studies include: i) exposure to reveal the history of the growths and decays of the Antarctic ice sheet, ii) studying ice shelf collapse history, iii) palaeomagnetic excursion reconstructions using ice cores, iv) understanding the erosion rates using depth profiles of mid latitude outcrops, v) providing the timing of impact crater formation.

Reference: Yokoyama et al (2019) Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atom. https://doi.org/10.1016/j.nimb.2019.01.026.