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Tectonics and mechanism of a spreading ridge subduction at the Chile Triple Junction based on new marine geophysical data

http://hdl.handle.net/20.500.12000/46278
http://hdl.handle.net/20.500.12000/46278
94f14853-4ff4-4f05-9f13-29be09ea5d29
名前 / ファイル ライセンス アクション
47_2.0257.pdf 47_2.0257.pdf
Item type デフォルトアイテムタイプ(フル)(1)
公開日 2020-06-24
タイトル
タイトル Tectonics and mechanism of a spreading ridge subduction at the Chile Triple Junction based on new marine geophysical data
言語 en
作成者 Matsumoto, Takeshi

× Matsumoto, Takeshi

en Matsumoto, Takeshi

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Mori, Asuka

× Mori, Asuka

en Mori, Asuka

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Kise, Shinichiro

× Kise, Shinichiro

en Kise, Shinichiro

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Abe, Natsue

× Abe, Natsue

en Abe, Natsue

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アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
主題
言語 en
主題Scheme Other
主題 Chile Ridge
主題
言語 en
主題Scheme Other
主題 Chile Triple Junction
主題
言語 en
主題Scheme Other
主題 Chile Trench
主題
言語 en
主題Scheme Other
主題 Outer Gravity High
主題
言語 en
主題Scheme Other
主題 slab-pull
内容記述
内容記述タイプ Other
内容記述 The Chile Triple Junction (CTJ), an RTT-type triple junction located at 46°13′ S, 75°48′ W off the western coast of Chile, is characterized by the subducting Chile Ridge, which is the constructive plate boundary that generates both the Nazca Plate and the Antarctic Plate. The ridge subduction mechanism and the regional tectonics around the CTJ were investigated primarily using marine geophysical data (topography, gravity, geomagnetic field and single-channel seismics) collected during the SORA2009 cruise (Cruise ID = MR08-06) by R/V MIRAI together with other cruise data from the National Geophysical Data Center. The segment of the ridge axis just before the subduction around the CTJ is associated with an axial deep covered with thick sediment unlike that seen in typical ridge crests. The profiles of both topography and the free air anomaly around the CTJ show quite different patterns from those of ordinary subduction zones. However, topographic features typical of a slow-spreading type ridge, including a median valley and both flanks, remain in the seaward side of the trench. Even after the subduction of the eastern flank, the topographic features of the western flank remain. A slight Outer Rise and an Outer Gravity High, which are common in the western Pacific area, were observed in an area far away from the CTJ on both Nazca and Antarctic plate sides. The geomagnetic anomaly pattern around the Chile Ridge near the CTJ shows that the estimated spreading rate decreases gradually towards the ridge crest. This suggests that volcanic activity diminishes gradually towards the subducting ridge axis. The lithosphere under the Chile Ridge might have amalgamated with the surrounding oceanic lithosphere due to heat loss after the cessation of volcanic activity. The oceanic lithosphere towards the trench also thickens rapidly due to heat loss. Consequently, shallow-angle subduction of the youngest and most immature oceanic plate occurs smoothly via slab-pull force without any resistance along the interface between the South American continental plates.
内容記述
内容記述タイプ Other
内容記述 論文
出版者
言語 en
出版者 The Geochemical Society of Japan
出版者
言語 ja
出版者 日本地球化学会
言語
言語 eng
資源タイプ
資源タイプ journal article
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
識別子
識別子 http://hdl.handle.net/20.500.12000/46278
識別子タイプ HDL
関連情報
識別子タイプ DOI
関連識別子 https://doi.org/10.2343/geochemj.2.0257
関連情報
識別子タイプ DOI
関連識別子 https://doi.org/10.2343/geochemj.2.0257
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 1880-5973
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 0016-7002
収録物名
言語 en
収録物名 GEOCHEMICAL JOURNAL
書誌情報
巻 47, 号 2, p. 137-147, 発行日 2013-04-20
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