Melting of the uppermost metasomatized asthenosphere triggered by fluid fluxing from ancient subducted sediment: Constraints from the quaternary basalt lavas at chugaryeong Volcano, Korea

Tetsuya Sakuyama, Shinji Nagaoka, Takashi Miyazaki, Qing Chang, Toshiro Takahashi, Yuka Hirahara, Ryoko Senda, Tetsumaru Itaya, Jun'Ichi Kimura, Kazuhito Ozawa

研究成果: ジャーナルへの寄稿記事

13 引用 (Scopus)

抄録

Major and trace element and Sr-Nd-Pb isotope data for wholerocks and major element data for minerals within basalt samples from the Chugaryeong volcano, an intra-plate back-arc volcanic centre in the central part of the Korean Peninsula, are used to address the process of magma genesis in the deep back-arc region of eastern Asia.There are two lava flow units at Chugaryeong volcano: the Chongok (0·50Ma) and the Chatan (0·15Ma) basalts. These basalts have similar MgO (9·1-10·4 wt %) but exhibit differences in their major and trace element and isotope compositions. The Chongok basalt has higher TiO2, Al2 O3, Na2O, K2O, P2O5, Cr2 O3, large ion lithophile elements (LILE), high field strength elements (HFSE), and rare earth elements (REE), and lower FeO*, SiO2, and CaO than the Chatan basalt. In addition, the Chongok basalt has more radiogenic 143Nd/144Nd and 206Pb/204Pb, and less radiogenic 87Sr/86Sr and 208Pb/204Pb than the Chatan basalt. Chi-square tests for the major elements indicate that crystal fractionation can explain the chemical variations within each basalt suite; intra-crustal processes, including crystal fractionation and assimilation of continental crust, cannot result in the formation of one basalt suite from the other.The Sr-Nd-Pb isotopic compositions of the Chongok and Chatan basalts plot on mixing hyperbolae between peridotite mantle xenoliths from the area and a fluid flux derived from a mixture of ancient and recent sediments. The trace element compositions of the estimated primary melts for the two basalt suites suggest different degrees of partial melting of a common enriched mantle source that was metasomatized by a Ba-, K-, Pb-, and Sr-rich fluid. The estimated degree of melting increased with time from ̃7·5% for the Chongok basalt to ̃10% for the Chatan basalt. The source mantle for the Chatan basalt is more enriched in Ba and Pb, indicating a greater fluid flux than for the Chongok basalt. This suggests that melting of the source mantle increased with time, sustained by an increased sediment-derived fluid flux from the deeper upper mantle.

元の言語英語
記事番号egt074
ページ(範囲)499-528
ページ数30
ジャーナルJournal of Petrology
55
発行部数3
DOI
出版物ステータス出版済み - 3 1 2014
外部発表Yes

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Volcanoes
asthenosphere
Korea
basalt
volcanoes
Sediments
sediments
Melting
volcano
melting
Fluids
fluid
fluids
sediment
Earth mantle
Trace Elements
trace elements
mantle source
phosphorus pentoxide
trace element

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

これを引用

Melting of the uppermost metasomatized asthenosphere triggered by fluid fluxing from ancient subducted sediment : Constraints from the quaternary basalt lavas at chugaryeong Volcano, Korea. / Sakuyama, Tetsuya; Nagaoka, Shinji; Miyazaki, Takashi; Chang, Qing; Takahashi, Toshiro; Hirahara, Yuka; Senda, Ryoko; Itaya, Tetsumaru; Kimura, Jun'Ichi; Ozawa, Kazuhito.

:: Journal of Petrology, 巻 55, 番号 3, egt074, 01.03.2014, p. 499-528.

研究成果: ジャーナルへの寄稿記事

Sakuyama, Tetsuya ; Nagaoka, Shinji ; Miyazaki, Takashi ; Chang, Qing ; Takahashi, Toshiro ; Hirahara, Yuka ; Senda, Ryoko ; Itaya, Tetsumaru ; Kimura, Jun'Ichi ; Ozawa, Kazuhito. / Melting of the uppermost metasomatized asthenosphere triggered by fluid fluxing from ancient subducted sediment : Constraints from the quaternary basalt lavas at chugaryeong Volcano, Korea. :: Journal of Petrology. 2014 ; 巻 55, 番号 3. pp. 499-528.
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abstract = "Major and trace element and Sr-Nd-Pb isotope data for wholerocks and major element data for minerals within basalt samples from the Chugaryeong volcano, an intra-plate back-arc volcanic centre in the central part of the Korean Peninsula, are used to address the process of magma genesis in the deep back-arc region of eastern Asia.There are two lava flow units at Chugaryeong volcano: the Chongok (0·50Ma) and the Chatan (0·15Ma) basalts. These basalts have similar MgO (9·1-10·4 wt {\%}) but exhibit differences in their major and trace element and isotope compositions. The Chongok basalt has higher TiO2, Al2 O3, Na2O, K2O, P2O5, Cr2 O3, large ion lithophile elements (LILE), high field strength elements (HFSE), and rare earth elements (REE), and lower FeO*, SiO2, and CaO than the Chatan basalt. In addition, the Chongok basalt has more radiogenic 143Nd/144Nd and 206Pb/204Pb, and less radiogenic 87Sr/86Sr and 208Pb/204Pb than the Chatan basalt. Chi-square tests for the major elements indicate that crystal fractionation can explain the chemical variations within each basalt suite; intra-crustal processes, including crystal fractionation and assimilation of continental crust, cannot result in the formation of one basalt suite from the other.The Sr-Nd-Pb isotopic compositions of the Chongok and Chatan basalts plot on mixing hyperbolae between peridotite mantle xenoliths from the area and a fluid flux derived from a mixture of ancient and recent sediments. The trace element compositions of the estimated primary melts for the two basalt suites suggest different degrees of partial melting of a common enriched mantle source that was metasomatized by a Ba-, K-, Pb-, and Sr-rich fluid. The estimated degree of melting increased with time from ̃7·5{\%} for the Chongok basalt to ̃10{\%} for the Chatan basalt. The source mantle for the Chatan basalt is more enriched in Ba and Pb, indicating a greater fluid flux than for the Chongok basalt. This suggests that melting of the source mantle increased with time, sustained by an increased sediment-derived fluid flux from the deeper upper mantle.",
author = "Tetsuya Sakuyama and Shinji Nagaoka and Takashi Miyazaki and Qing Chang and Toshiro Takahashi and Yuka Hirahara and Ryoko Senda and Tetsumaru Itaya and Jun'Ichi Kimura and Kazuhito Ozawa",
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T2 - Constraints from the quaternary basalt lavas at chugaryeong Volcano, Korea

AU - Sakuyama, Tetsuya

AU - Nagaoka, Shinji

AU - Miyazaki, Takashi

AU - Chang, Qing

AU - Takahashi, Toshiro

AU - Hirahara, Yuka

AU - Senda, Ryoko

AU - Itaya, Tetsumaru

AU - Kimura, Jun'Ichi

AU - Ozawa, Kazuhito

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N2 - Major and trace element and Sr-Nd-Pb isotope data for wholerocks and major element data for minerals within basalt samples from the Chugaryeong volcano, an intra-plate back-arc volcanic centre in the central part of the Korean Peninsula, are used to address the process of magma genesis in the deep back-arc region of eastern Asia.There are two lava flow units at Chugaryeong volcano: the Chongok (0·50Ma) and the Chatan (0·15Ma) basalts. These basalts have similar MgO (9·1-10·4 wt %) but exhibit differences in their major and trace element and isotope compositions. The Chongok basalt has higher TiO2, Al2 O3, Na2O, K2O, P2O5, Cr2 O3, large ion lithophile elements (LILE), high field strength elements (HFSE), and rare earth elements (REE), and lower FeO*, SiO2, and CaO than the Chatan basalt. In addition, the Chongok basalt has more radiogenic 143Nd/144Nd and 206Pb/204Pb, and less radiogenic 87Sr/86Sr and 208Pb/204Pb than the Chatan basalt. Chi-square tests for the major elements indicate that crystal fractionation can explain the chemical variations within each basalt suite; intra-crustal processes, including crystal fractionation and assimilation of continental crust, cannot result in the formation of one basalt suite from the other.The Sr-Nd-Pb isotopic compositions of the Chongok and Chatan basalts plot on mixing hyperbolae between peridotite mantle xenoliths from the area and a fluid flux derived from a mixture of ancient and recent sediments. The trace element compositions of the estimated primary melts for the two basalt suites suggest different degrees of partial melting of a common enriched mantle source that was metasomatized by a Ba-, K-, Pb-, and Sr-rich fluid. The estimated degree of melting increased with time from ̃7·5% for the Chongok basalt to ̃10% for the Chatan basalt. The source mantle for the Chatan basalt is more enriched in Ba and Pb, indicating a greater fluid flux than for the Chongok basalt. This suggests that melting of the source mantle increased with time, sustained by an increased sediment-derived fluid flux from the deeper upper mantle.

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