Geochemical variations in Japan Sea back-arc basin basalts formed by high-temperature adiabatic melting of mantle metasomatized by sediment subduction components

Yuka Hirahara, Jun Ichi Kimura, Ryoko Senda, Takashi Miyazaki, Hiroshi Kawabata, Toshiro Takahashi, Qing Chang, Bogdan S. Vaglarov, Takeshi Sato, Shuichi Kodaira

研究成果: ジャーナルへの寄稿記事

21 引用 (Scopus)

抄録

The Yamato Basin in the Japan Sea is a back-arc basin characterized by basaltic oceanic crust that is twice as thick as typical oceanic crust. Two types of ocean floor basalts, formed during the opening of the Japan Sea in the Middle Miocene, were recovered from the Yamato Basin during Ocean Drilling Program Legs 127/128. These can be considered as depleted (D-type) and enriched (E-type) basalts based on their incompatible trace element and Sr-Nd-Pb-Hf isotopic compositions. Both types of basalts plot along a common mixing array drawn between depleted mantle and slab sediment represented by a sand-rich turbidite on the Pacific Plate in the NE Japan fore arc. The depleted nature of the D-type basalts suggests that the slab sediment component is nil to minor relative to the dominant mantle component, whereas the enrichment of all incompatible elements in the E-type basalts was likely caused by a large contribution of bulk slab sediment in the source. The results of forward model calculations using adiabatic melting of a hydrous mantle with sediment flux indicate that the melting conditions of the source mantle for the D-type basalts are deeper and hotter than those for the E-type basalts, which appear to have formed under conditions hotter than those of normal mid-oceanic ridge basalts (MORB). These results suggest that the thicker oceanic crust was formed by greater degrees of melting of a hydrous metasomatized mantle source at unusually high mantle potential temperature during the opening of the Japan Sea. Key Points: The Japan Sea back-arc basin basalt originated from a high-temperature hydrous mantle Subducted sediments on the Pacific Plate slab were part of the mantle source High magma productivity generated unusually thick oceanic crust in the Japan Sea

元の言語英語
ページ(範囲)1324-1347
ページ数24
ジャーナルGeochemistry, Geophysics, Geosystems
16
発行部数5
DOI
出版物ステータス出版済み - 5 1 2015
外部発表Yes

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basalt
Japan
Sediments
sediments
Earth mantle
Melting
subduction
arcs
melting
mantle
basin
sediment
oceanic crust
crusts
slab
slabs
mantle source
Temperature
Pacific plate
oceans

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

これを引用

Geochemical variations in Japan Sea back-arc basin basalts formed by high-temperature adiabatic melting of mantle metasomatized by sediment subduction components. / Hirahara, Yuka; Kimura, Jun Ichi; Senda, Ryoko; Miyazaki, Takashi; Kawabata, Hiroshi; Takahashi, Toshiro; Chang, Qing; Vaglarov, Bogdan S.; Sato, Takeshi; Kodaira, Shuichi.

:: Geochemistry, Geophysics, Geosystems, 巻 16, 番号 5, 01.05.2015, p. 1324-1347.

研究成果: ジャーナルへの寄稿記事

Hirahara, Yuka ; Kimura, Jun Ichi ; Senda, Ryoko ; Miyazaki, Takashi ; Kawabata, Hiroshi ; Takahashi, Toshiro ; Chang, Qing ; Vaglarov, Bogdan S. ; Sato, Takeshi ; Kodaira, Shuichi. / Geochemical variations in Japan Sea back-arc basin basalts formed by high-temperature adiabatic melting of mantle metasomatized by sediment subduction components. :: Geochemistry, Geophysics, Geosystems. 2015 ; 巻 16, 番号 5. pp. 1324-1347.
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abstract = "The Yamato Basin in the Japan Sea is a back-arc basin characterized by basaltic oceanic crust that is twice as thick as typical oceanic crust. Two types of ocean floor basalts, formed during the opening of the Japan Sea in the Middle Miocene, were recovered from the Yamato Basin during Ocean Drilling Program Legs 127/128. These can be considered as depleted (D-type) and enriched (E-type) basalts based on their incompatible trace element and Sr-Nd-Pb-Hf isotopic compositions. Both types of basalts plot along a common mixing array drawn between depleted mantle and slab sediment represented by a sand-rich turbidite on the Pacific Plate in the NE Japan fore arc. The depleted nature of the D-type basalts suggests that the slab sediment component is nil to minor relative to the dominant mantle component, whereas the enrichment of all incompatible elements in the E-type basalts was likely caused by a large contribution of bulk slab sediment in the source. The results of forward model calculations using adiabatic melting of a hydrous mantle with sediment flux indicate that the melting conditions of the source mantle for the D-type basalts are deeper and hotter than those for the E-type basalts, which appear to have formed under conditions hotter than those of normal mid-oceanic ridge basalts (MORB). These results suggest that the thicker oceanic crust was formed by greater degrees of melting of a hydrous metasomatized mantle source at unusually high mantle potential temperature during the opening of the Japan Sea. Key Points: The Japan Sea back-arc basin basalt originated from a high-temperature hydrous mantle Subducted sediments on the Pacific Plate slab were part of the mantle source High magma productivity generated unusually thick oceanic crust in the Japan Sea",
author = "Yuka Hirahara and Kimura, {Jun Ichi} and Ryoko Senda and Takashi Miyazaki and Hiroshi Kawabata and Toshiro Takahashi and Qing Chang and Vaglarov, {Bogdan S.} and Takeshi Sato and Shuichi Kodaira",
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T1 - Geochemical variations in Japan Sea back-arc basin basalts formed by high-temperature adiabatic melting of mantle metasomatized by sediment subduction components

AU - Hirahara, Yuka

AU - Kimura, Jun Ichi

AU - Senda, Ryoko

AU - Miyazaki, Takashi

AU - Kawabata, Hiroshi

AU - Takahashi, Toshiro

AU - Chang, Qing

AU - Vaglarov, Bogdan S.

AU - Sato, Takeshi

AU - Kodaira, Shuichi

PY - 2015/5/1

Y1 - 2015/5/1

N2 - The Yamato Basin in the Japan Sea is a back-arc basin characterized by basaltic oceanic crust that is twice as thick as typical oceanic crust. Two types of ocean floor basalts, formed during the opening of the Japan Sea in the Middle Miocene, were recovered from the Yamato Basin during Ocean Drilling Program Legs 127/128. These can be considered as depleted (D-type) and enriched (E-type) basalts based on their incompatible trace element and Sr-Nd-Pb-Hf isotopic compositions. Both types of basalts plot along a common mixing array drawn between depleted mantle and slab sediment represented by a sand-rich turbidite on the Pacific Plate in the NE Japan fore arc. The depleted nature of the D-type basalts suggests that the slab sediment component is nil to minor relative to the dominant mantle component, whereas the enrichment of all incompatible elements in the E-type basalts was likely caused by a large contribution of bulk slab sediment in the source. The results of forward model calculations using adiabatic melting of a hydrous mantle with sediment flux indicate that the melting conditions of the source mantle for the D-type basalts are deeper and hotter than those for the E-type basalts, which appear to have formed under conditions hotter than those of normal mid-oceanic ridge basalts (MORB). These results suggest that the thicker oceanic crust was formed by greater degrees of melting of a hydrous metasomatized mantle source at unusually high mantle potential temperature during the opening of the Japan Sea. Key Points: The Japan Sea back-arc basin basalt originated from a high-temperature hydrous mantle Subducted sediments on the Pacific Plate slab were part of the mantle source High magma productivity generated unusually thick oceanic crust in the Japan Sea

AB - The Yamato Basin in the Japan Sea is a back-arc basin characterized by basaltic oceanic crust that is twice as thick as typical oceanic crust. Two types of ocean floor basalts, formed during the opening of the Japan Sea in the Middle Miocene, were recovered from the Yamato Basin during Ocean Drilling Program Legs 127/128. These can be considered as depleted (D-type) and enriched (E-type) basalts based on their incompatible trace element and Sr-Nd-Pb-Hf isotopic compositions. Both types of basalts plot along a common mixing array drawn between depleted mantle and slab sediment represented by a sand-rich turbidite on the Pacific Plate in the NE Japan fore arc. The depleted nature of the D-type basalts suggests that the slab sediment component is nil to minor relative to the dominant mantle component, whereas the enrichment of all incompatible elements in the E-type basalts was likely caused by a large contribution of bulk slab sediment in the source. The results of forward model calculations using adiabatic melting of a hydrous mantle with sediment flux indicate that the melting conditions of the source mantle for the D-type basalts are deeper and hotter than those for the E-type basalts, which appear to have formed under conditions hotter than those of normal mid-oceanic ridge basalts (MORB). These results suggest that the thicker oceanic crust was formed by greater degrees of melting of a hydrous metasomatized mantle source at unusually high mantle potential temperature during the opening of the Japan Sea. Key Points: The Japan Sea back-arc basin basalt originated from a high-temperature hydrous mantle Subducted sediments on the Pacific Plate slab were part of the mantle source High magma productivity generated unusually thick oceanic crust in the Japan Sea

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DO - 10.1002/2015GC005720

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JF - Geochemistry, Geophysics, Geosystems

SN - 1525-2027

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