Edge‐Driven Convection Melting Before the Emplacement of the Afar Mantle Plume Head Inferred From <sup>40</sup>Ar/<sup>39</sup>Ar Dating
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- Yutaka Yoshimura
- Department of Environmental Changes Faculty of Social and Cultural Studies Kyushu University Fukuoka Japan
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- Osamu Ishizuka
- Institute of Earthquake and Volcano Geology Geological Survey of Japan, AIST Tsukuba Japan
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- Toshitsugu Yamazaki
- Atmosphere and Ocean Research Institute The University of Tokyo Kashiwa Japan
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- Hyeon‐Seon Ahn
- Quaternary Environment Research Center Climate Change Response Division Korea Institute of Geoscience and Mineral Resources (KIGAM) Daejeon South Korea
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- Tesfaye Kidane
- School of Agricultural, Earth, and Environmental Sciences University of KwaZulu Natal Durban South Africa
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- Yuhji Yamamoto
- Center for Advanced Marine Core Research Kochi University Kochi Japan
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- Shun Sekimoto
- Institute for Integrated Radiation and Nuclear Science Kyoto University Kumatori Japan
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- Takashi Sano
- Department of Geology and Paleontology National Museum of Nature and Science Tsukuba Japan
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- Yo‐ichiro Otofuji
- Institute of GeoHistory Japan Geochronology Network Akaiwa Japan
抄録
<jats:title>Abstract</jats:title><jats:p>The Ethiopia‐Yemen flood basalts are spatially zoned with progressively lower TiO<jats:sub>2</jats:sub> lavas from near the Afar depression toward the margins. The timing and rate of emplacement of low TiO<jats:sub>2</jats:sub> (LT) lavas are poorly known compared with the ultra‐high TiO<jats:sub>2</jats:sub> (HT2) lavas. We measured two high‐precision <jats:sup>40</jats:sup>Ar/<jats:sup>39</jats:sup>Ar ages of 29.63 ± 0.14 and 30.02 ± 0.22 Ma (2σ) from basalts of the 2‐km‐thick LT lava sequence at the Afar plume head margin. Using our eruption age model constructed from our and previous <jats:sup>40</jats:sup>Ar/<jats:sup>39</jats:sup>Ar ages with the paleomagnetic directions, we estimate that the LT lava eruption continued over Chrons C12r‐C12n‐C11r. The eruption of the plume head margin started earlier than the plume head axis emplacement in C12n. Also, the eruption rate was low at the margin, high at the axis. We estimate that the LT lavas are induced by the edge‐driven convection, the result of a plume‐lithosphere interaction, not a plume head.</jats:p>
収録刊行物
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- Geophysical Research Letters
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Geophysical Research Letters 50 (8), 2023-04-11
American Geophysical Union (AGU)
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詳細情報 詳細情報について
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- CRID
- 1360580229828225408
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- ISSN
- 19448007
- 00948276
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- データソース種別
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- Crossref
- KAKEN