サトウ　ヒロシ   SATO Hiroshi   佐藤 暢    所属   専修大学  経営学部    職種   教授
言語種別	英語
発行・発表の年月	2026/10/11
形態種別	研究論文（学術雑誌）
査読	査読あり
標題	Ancient continental signatures preserved in Eocene intraplate volcanism at the Conrad Rise, Indian Ocean
執筆形態	共著
掲載誌名	Terra Nova
掲載区分	国外
出版社・発行元	John Wiley & Sons
担当区分	筆頭著者,責任著者
著者・共著者	Hiroshi Sato◎, Kenji Horie, Mami Takehara, Yoshifumi Nogi
概要	Oceanic rises in the Indian Ocean are generally interpreted as products of mantle plume magmatism that developed on the oceanic lithosphere; however, evidence suggests the presence of inherited continental materials beneath select oceanic plateaus and rises. We report zircon and titanite petrochronological data from Eocene intraplate basalt dredged from the Conrad Rise in the southern Indian Ocean. Zircon cores yielded concordant Mesoproterozoic U–Pb ages, with a weighted mean 206Pb/238U age of 1052 ± 26 Ma, and exhibited oscillatory zoning, heavy rare earth element (HREE)-enriched REE patterns, and high Th/U ratios (> 0.1), whereas the thin zircon rims yielded younger ages of ca. 550 Ma and low Th/U ratios (< 0.1). Titanite yielded concordant Eocene ages (39–44 Ma) overlapping the previously reported 40Ar–39Ar ages of the host volcanic rocks. These data suggest the preservation of continental crustal materials beneath or within the Conrad Rise during Eocene intraplate volcanism.
DOI	10.1111/ter.70063
researchmap用URL	https://onlinelibrary.wiley.com/share/author/RKHPQ6PWTGM2PQMN5GGR?target=10.1111/ter.70063