Vertical distribution of 10Be, 26Al, and 36Cl in the surface soil layer of weathered granite at Abukuma, Japan

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:268

Article; Proceedings Paper

Mahara, Yasunori¹  Hohjo, Kousho^1,4  Kubota, Takumi¹  Ohta, Tomoko¹  Mizuochi, Yukihiro²  Tashiro, Toshiharu²  Sekimoto, Shun¹  Takamiya, Koichi¹  Shibata, Seiichi¹  Tanaka, Kazuhiro³ 

[1] Kyoto Univ, Inst Res Reactor, Osaka 5900494, Japan

[2] Sumiko Consultants Co Ltd, Tokyo 1100008, Japan

[3] Yamaguchi Univ, Grad Sch Sci & Engn, Yamaguchi 7538512, Japan

[4] Japan Atom Power Co, Chiyoda Ku, Tokyo 1010053, Japan

关键词: AMS measurement;    Cosmogenic radionuclides;    Erosion rate;    Weathered granite;   

DOI  :  10.1016/j.nimb.2009.10.132

来源: Elsevier

【 摘 要 】

The northern Abukuma region of Japan is thickly covered by weathered Mesozoic granite. We investigated the vertical distribution of radionuclides (Be-10, Al-26, and Cl-36) produced by cosmic irradiation of weathered granitic soil collected from this region at a sampling site located 496 m above sea level, at 37 degrees 30'52.6 '' N, 140 degrees 40'13.2 '' E. We mechanically and chemically separated quartz particles from the weathered granitic soil, and purified them. We also analyzed the vertical distribution of Al-26, Be-10, and Cl-36 and estimated a long term averaged erosion rates of 0.019 +/- 0.001 mm/y from Al-26, 0.017 +/- 0.001 mm/y from Be-10, and similar to 0.01 +/- 0.001 mm/y from Cl-36. These cosmogenic erosion rates are comparable to the rate estimated from a geomorphological evolution model and with the observed sedimentary deposition rate at Abukuma. (C) 2009 Elsevier B.V. All rights reserved.

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