Continental basalts in the accretionary complexes of the South-west Japan Arc: Constraints from geochemical and Sr and Nd isotopic data of metadiabase

Hiroo Kagami, Masaki Yuhara, Shigeru Iizumi, Yoshiaki Tainosho, Masaaki Owada, Yasuo Ikeda, Osamu Okano, Shuji Ochi, Yoshikazu Hayama, Terukazu Nureki

Research output: Contribution to journalArticle

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Abstract

The Ryoke Belt is one of the important terranes in the South-west Japan Arc (SJA). It consists mainly of late Cretaceous granitoid rocks, meta-sedimentary rocks (Jurassic accretionary complexes) and mafic rocks (gabbros, metadiabases; late Permian-early Jurassic). Initial ε(Sr) (+25-+59) and ε(Nd) (-2.1--5.9) values of the metadiabases cannot be explained by crustal contamination but reflect the values of the source material. These values coincide with those of island arc basalt (IAB), active continental margin basalt (ACMB) and continental flood basalt (CFB). Spiderdiagrams and trace element chemistries of the metadiabases have CFB-signature, rather than those of either IAB or ACMB. The Sr-Nd isotope data, trace element and rare earth element chemistries of the metadiabases indicate that they result from partial melting of continental-type lithospheric mantle. Mafic granulite xenoliths in middle Miocene volcanic rocks distributed throughout the Ryoke Belt were probably derived from relatively deep crust. Their geochemical and Sr-Nd isotopic characteristics are similar to the metadiabases. This suggests that rocks, equivalent geochemically to the metadiabases, must be widely distributed at relatively deep crustal levels beneath a part of the Ryoke Belt. The geochemical and isotopic features of the metadiabases and mafic granulites from the Ryoke Belt are quite different from those of mafic rocks from other terranes in the SJA. These results imply that the Ryoke mafic rocks (metadiabase, mafic granulite) were not transported from other terranes by crustal movement but formed in situ. Sr-Nd isotopic features of late Cretaceous granitoid rocks occurring in the western part of the Japanese Islands are coincident with those of the Ryoke mafic rocks. Such an isotopic relation between these two rocks suggests that a continental-type lithosphere is widely represented beneath the western part of the Japanese Islands.

Original languageEnglish
Pages (from-to)3-20
Number of pages18
JournalIsland Arc
Volume9
Issue number1
DOIs
Publication statusPublished - Mar 2000

Fingerprint

mafic rock
basalt
terrane
flood basalt
granulite
granitoid
rock
island arc
continental margin
Jurassic
trace element
Cretaceous
crustal movement
crustal contamination
partial melting
sedimentary rock
lithosphere
volcanic rock
Permian
rare earth element

Keywords

  • Continental flood basalt
  • Continental lithosphere
  • Mafic granulite
  • Metadiabase
  • Ryoke Belt
  • Sr-Nd isotopes

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Continental basalts in the accretionary complexes of the South-west Japan Arc : Constraints from geochemical and Sr and Nd isotopic data of metadiabase. / Kagami, Hiroo; Yuhara, Masaki; Iizumi, Shigeru; Tainosho, Yoshiaki; Owada, Masaaki; Ikeda, Yasuo; Okano, Osamu; Ochi, Shuji; Hayama, Yoshikazu; Nureki, Terukazu.

In: Island Arc, Vol. 9, No. 1, 03.2000, p. 3-20.

Research output: Contribution to journalArticle

Kagami, H, Yuhara, M, Iizumi, S, Tainosho, Y, Owada, M, Ikeda, Y, Okano, O, Ochi, S, Hayama, Y & Nureki, T 2000, 'Continental basalts in the accretionary complexes of the South-west Japan Arc: Constraints from geochemical and Sr and Nd isotopic data of metadiabase', Island Arc, vol. 9, no. 1, pp. 3-20. https://doi.org/10.1046/j.1440-1738.2000.00257.x
Kagami, Hiroo ; Yuhara, Masaki ; Iizumi, Shigeru ; Tainosho, Yoshiaki ; Owada, Masaaki ; Ikeda, Yasuo ; Okano, Osamu ; Ochi, Shuji ; Hayama, Yoshikazu ; Nureki, Terukazu. / Continental basalts in the accretionary complexes of the South-west Japan Arc : Constraints from geochemical and Sr and Nd isotopic data of metadiabase. In: Island Arc. 2000 ; Vol. 9, No. 1. pp. 3-20.
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AU - Iizumi, Shigeru

AU - Tainosho, Yoshiaki

AU - Owada, Masaaki

AU - Ikeda, Yasuo

AU - Okano, Osamu

AU - Ochi, Shuji

AU - Hayama, Yoshikazu

AU - Nureki, Terukazu

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N2 - The Ryoke Belt is one of the important terranes in the South-west Japan Arc (SJA). It consists mainly of late Cretaceous granitoid rocks, meta-sedimentary rocks (Jurassic accretionary complexes) and mafic rocks (gabbros, metadiabases; late Permian-early Jurassic). Initial ε(Sr) (+25-+59) and ε(Nd) (-2.1--5.9) values of the metadiabases cannot be explained by crustal contamination but reflect the values of the source material. These values coincide with those of island arc basalt (IAB), active continental margin basalt (ACMB) and continental flood basalt (CFB). Spiderdiagrams and trace element chemistries of the metadiabases have CFB-signature, rather than those of either IAB or ACMB. The Sr-Nd isotope data, trace element and rare earth element chemistries of the metadiabases indicate that they result from partial melting of continental-type lithospheric mantle. Mafic granulite xenoliths in middle Miocene volcanic rocks distributed throughout the Ryoke Belt were probably derived from relatively deep crust. Their geochemical and Sr-Nd isotopic characteristics are similar to the metadiabases. This suggests that rocks, equivalent geochemically to the metadiabases, must be widely distributed at relatively deep crustal levels beneath a part of the Ryoke Belt. The geochemical and isotopic features of the metadiabases and mafic granulites from the Ryoke Belt are quite different from those of mafic rocks from other terranes in the SJA. These results imply that the Ryoke mafic rocks (metadiabase, mafic granulite) were not transported from other terranes by crustal movement but formed in situ. Sr-Nd isotopic features of late Cretaceous granitoid rocks occurring in the western part of the Japanese Islands are coincident with those of the Ryoke mafic rocks. Such an isotopic relation between these two rocks suggests that a continental-type lithosphere is widely represented beneath the western part of the Japanese Islands.

AB - The Ryoke Belt is one of the important terranes in the South-west Japan Arc (SJA). It consists mainly of late Cretaceous granitoid rocks, meta-sedimentary rocks (Jurassic accretionary complexes) and mafic rocks (gabbros, metadiabases; late Permian-early Jurassic). Initial ε(Sr) (+25-+59) and ε(Nd) (-2.1--5.9) values of the metadiabases cannot be explained by crustal contamination but reflect the values of the source material. These values coincide with those of island arc basalt (IAB), active continental margin basalt (ACMB) and continental flood basalt (CFB). Spiderdiagrams and trace element chemistries of the metadiabases have CFB-signature, rather than those of either IAB or ACMB. The Sr-Nd isotope data, trace element and rare earth element chemistries of the metadiabases indicate that they result from partial melting of continental-type lithospheric mantle. Mafic granulite xenoliths in middle Miocene volcanic rocks distributed throughout the Ryoke Belt were probably derived from relatively deep crust. Their geochemical and Sr-Nd isotopic characteristics are similar to the metadiabases. This suggests that rocks, equivalent geochemically to the metadiabases, must be widely distributed at relatively deep crustal levels beneath a part of the Ryoke Belt. The geochemical and isotopic features of the metadiabases and mafic granulites from the Ryoke Belt are quite different from those of mafic rocks from other terranes in the SJA. These results imply that the Ryoke mafic rocks (metadiabase, mafic granulite) were not transported from other terranes by crustal movement but formed in situ. Sr-Nd isotopic features of late Cretaceous granitoid rocks occurring in the western part of the Japanese Islands are coincident with those of the Ryoke mafic rocks. Such an isotopic relation between these two rocks suggests that a continental-type lithosphere is widely represented beneath the western part of the Japanese Islands.

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KW - Sr-Nd isotopes

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