TY - JOUR
T1 - Identification of the source caldera for a Pliocene ash-flow tuff in Northeast Japan based on apatite trace-element compositions and zircon U-Pb ages
AU - Takashima, Reishi
AU - Kusakawa, Haruka
AU - Kuwabara, Sato
AU - Orihashi, Yuji
AU - Nishi, Hiroshi
AU - Niwano, Michio
AU - Yoshida, Takeyoshi
N1 - Funding Information:
This research was financially supported by JSPS KAKENHI (Grant Numbers 17K05674 and 18KK0091 for R. Takashima). Moreover, this research was performed as part of the research project “Reconstruction of community health and welfare system after the Great East Japan Earthquake” at the Kansai Welfare Research Institute, Tohoku Fukushi University, which received subsidies from the Ministry of Education, Culture, Sports, Science and Technology. Note that we are very grateful for the careful reviews and constructive comments of the manuscript done by Jose Luis Macias, Axel Schmitt and Daisuke Miura. We thank Yukio Yanagisawa and Tsutomu Yamada for useful information about outcrop and Masanori Sugawara, Noboru Takihara and Erika Sakaki for support during our field and laboratory works.
Funding Information:
This research was financially supported by JSPS KAKENHI (Grant Numbers 17K05674 and 18KK0091 for R. Takashima). Moreover, this research was performed as part of the research project “Reconstruction of community health and welfare system after the Great East Japan Earthquake” at the Kansai Welfare Research Institute, Tohoku Fukushi University, which received subsidies from the Ministry of Education, Culture, Sports, Science and Technology. Note that we are very grateful for the careful reviews and constructive comments of the manuscript done by Jose Luis Macias, Axel Schmitt and Daisuke Miura. We thank Yukio Yanagisawa and Tsutomu Yamada for useful information about outcrop and Masanori Sugawara, Noboru Takihara and Erika Sakaki for support during our field and laboratory works.
Publisher Copyright:
© 2020 The Authors
PY - 2020/9/1
Y1 - 2020/9/1
N2 - In tephrochronology, trace-element compositions of apatite phenocrysts are useful because they change in response to various magmatic conditions as apatite crystallizes. Moreover, because apatite tolerates burial diagenesis and welding processes without chemical changes, its trace-element compositions are a powerful tool for correlating pre-Quaternary tephra; however, this method is not extensively applied. The Hirosegawa Tuff, composed of a pair of Pliocene ash-fall and ash-flow tuffs, is a distinctive marker tephra that is used in geological mapping and for correlating sedimentary rocks in the eastern part of central NE Japan. However, the source volcano of the Hirosegawa Tuff has not been identified because many calderas coexisted in NE Japan during the Pliocene. Analysis of the trace-element compositions of apatite, major element compositions of ilmenite, and U-Pb zircon ages demonstrate that, depending on the area, the previously mapped Hirosegawa Tuff comprises different volcanic ejecta. Furthermore, this study identified that the source volcano of the Hirosegawa Tuff in the type section was the Shiroishi Caldera, located 50 km south of Sendai City.
AB - In tephrochronology, trace-element compositions of apatite phenocrysts are useful because they change in response to various magmatic conditions as apatite crystallizes. Moreover, because apatite tolerates burial diagenesis and welding processes without chemical changes, its trace-element compositions are a powerful tool for correlating pre-Quaternary tephra; however, this method is not extensively applied. The Hirosegawa Tuff, composed of a pair of Pliocene ash-fall and ash-flow tuffs, is a distinctive marker tephra that is used in geological mapping and for correlating sedimentary rocks in the eastern part of central NE Japan. However, the source volcano of the Hirosegawa Tuff has not been identified because many calderas coexisted in NE Japan during the Pliocene. Analysis of the trace-element compositions of apatite, major element compositions of ilmenite, and U-Pb zircon ages demonstrate that, depending on the area, the previously mapped Hirosegawa Tuff comprises different volcanic ejecta. Furthermore, this study identified that the source volcano of the Hirosegawa Tuff in the type section was the Shiroishi Caldera, located 50 km south of Sendai City.
KW - Apatite
KW - Ash-flow tuffs
KW - Hirosegawa Tuff
KW - Ilmenite
KW - Japan
KW - Pliocene
KW - Tephrochronology
KW - Zircon
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U2 - 10.1016/j.jvolgeores.2020.106948
DO - 10.1016/j.jvolgeores.2020.106948
M3 - Article
AN - SCOPUS:85087332544
VL - 401
JO - Journal of Volcanology and Geothermal Research
JF - Journal of Volcanology and Geothermal Research
SN - 0377-0273
M1 - 106948
ER -