All abstracts by Kotaro Toyama in conference series: Goldschmidt

(2021) Secular Variations in Helium Isotope Ratios in Izu Oshima Volcano
Sumino H, Ikehata K, Shimizu A, Toyama K, Obase T & Notsu K

(2021) Temporal Variations in Helium and Argon Isotopic Compositions of Fumarolic Gases at Kusatsu-Shirane Volcano, Japan
Obase T, Sumino H, Toyama K, Ohba T, Yaguchi M & Terada A

(2020) Speleothem as Archive of Past Volcanism: Impact of Kikai Volcano Eruption (7.3 ka) on a Remote Oceanic Island
Tanaka K, Miki T, Takahata N, Uemura R, Asami R, Yu T-L, Shen C-C, Shirai K, Murakami-Sugihara N, Toyama K & Sano Y

(2019) Helium Isotope Ratios in Fumarolic and Hot Spring Gases in Kirishima Volcanic Group, Japan
Toyama K, Sumino H, Kawana K, Akiyama Y, Ohba T, Yaguchi M, Aizawa K & Tsukamoto K

(2016) Dolomitization of CaCO₃: An Experimental Study at 200 (or 130) ℃
Toyama K & Terakado Y