High-Mg adakite and low-Ca boninite from a bonin fore-arc seamount

Implications for the reaction between slab melts and depleted mantle

Yi Bing Li, Jun Ichi Kimura, Shiki Machida, Teruaki Ishii, Akira Ishiwatari, Shigenori Maruyama, Hua Ning Qiu, Tsuyoshi Ishikawa, Yasuhiro Kato, Satoru Haraguchi, Naoto Takahata, Yuka Hirahara, Takashi Miyazaki

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Initial subduction-related boninitic magmatism occurred between 48 and 44 Ma in the Izu-Bonin-Mariana (IBM) arc. High-Mg adakites and low-Ca boninites have been dredged from the Bonin Ridge fore-arc seamount. Whole-rock 40Ar/39Ar ages suggest that the boninite (44·0±1·4Ma) and adakite (43·1±1·0 and 40·8± 0·8 Ma) magmatism overlapped, or that the adakite magmatism occurred slightly later than the boninite magmatism. The low-Ca boninites are high-Mg andesites and exhibit U-shaped rare earth element (REE) patterns with an elevated average Mg# of 0·78 [Mg#=Mg/(Mg+Fe) molar ratio] and Ni content of 667 ppm.The high-Mg adakites are andesitic to dacitic in composition; they exhibit markedly high Sr contents and lowYcontents and are highly enriched in light REE but depleted in heavy REE, with an average Mg#of 0·79 and Ni content of 433 ppm. A geochemical mass-balance model (Arc Basalt Simulator Version 3) indicates that both magma types could be generated by partial melting of a depleted mantle source fluxed by water-rich slab-derived melts in a hot subduction environment, comparable with the present-day South Chile (ridge subduction) or Southwest Japan (young slab subduction) arcs. An extremely high slab melt flux of 22% is required for the formation of the high-Mg adakite, whereas a low flux of 3% is sufficient for the low-Ca boninite.The low-Ca boninite requires a high-temperature shallow slab (854°C, 2·7 GPa on average), consisting of altered oceanic crust of the Pacific plate and volcaniclastic sediments from HIMU seamounts, and high-temperature shallow mantle melting (1216°C, 0·8 GPa) of depleted Indian mid-ocean ridge basalt (MORB)-type mantle.These modelled conditions are consistent with the occurrence of hot shallow mantle wedge melting in the initial subduction zone at the boundary between Pacific- and Indian-type mantle domains, as suggested by previous studies. In contrast, high-Mg adakite requires a higher temperature and deeper slab (929°C, 4·1GPa), with the same slab components and slightly deeper but less hot melting (1130°C, 1·1GPa) of HIMU-type depleted mantle, to satisfy the low Hf isotope ratios.This may occur because of the subsequent cooling of the mantle wedge by the establishment of the subduction system after the boninite magmatism and involvement of a small volume of an isotopically enriched mantle source embedded in the Indian-type mantle.The petrogenetic conditions provide constraints for reconstructing the tectonic settings of the early IBM arc. The hot subduction model would be consistent with the tectonic models with regard to the initiation of subduction associated with fore-arc spreading; this allowed the upwelling of the asthenospheric mantle to generate slab melts from the old Pacific plate slab and hot shallow mantle melting by slab melt fluxing for both boninite and adakite activities.

Original languageEnglish
Pages (from-to)1149-1175
Number of pages27
JournalJournal of Petrology
Volume54
Issue number6
DOIs
Publication statusPublished - 2013
Externally publishedYes

Fingerprint

boninite
adakite
seamounts
seamount
slab
Earth mantle
Melting
slabs
arcs
melt
mantle
subduction
Rare earth elements
magmatism
Tectonics
melting
Fluxes
rare earth element
Pacific plate
mantle source

Keywords

  • Arc Basalt simulator version 3
  • Bonin fore-arc seamount
  • Depleted mantle
  • High-Mg adakite
  • Low-Ca boninite
  • Slab melt

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

High-Mg adakite and low-Ca boninite from a bonin fore-arc seamount : Implications for the reaction between slab melts and depleted mantle. / Li, Yi Bing; Kimura, Jun Ichi; Machida, Shiki; Ishii, Teruaki; Ishiwatari, Akira; Maruyama, Shigenori; Qiu, Hua Ning; Ishikawa, Tsuyoshi; Kato, Yasuhiro; Haraguchi, Satoru; Takahata, Naoto; Hirahara, Yuka; Miyazaki, Takashi.

In: Journal of Petrology, Vol. 54, No. 6, 2013, p. 1149-1175.

Research output: Contribution to journalArticle

Li, YB, Kimura, JI, Machida, S, Ishii, T, Ishiwatari, A, Maruyama, S, Qiu, HN, Ishikawa, T, Kato, Y, Haraguchi, S, Takahata, N, Hirahara, Y & Miyazaki, T 2013, 'High-Mg adakite and low-Ca boninite from a bonin fore-arc seamount: Implications for the reaction between slab melts and depleted mantle', Journal of Petrology, vol. 54, no. 6, pp. 1149-1175. https://doi.org/10.1093/petrology/egt008
Li, Yi Bing ; Kimura, Jun Ichi ; Machida, Shiki ; Ishii, Teruaki ; Ishiwatari, Akira ; Maruyama, Shigenori ; Qiu, Hua Ning ; Ishikawa, Tsuyoshi ; Kato, Yasuhiro ; Haraguchi, Satoru ; Takahata, Naoto ; Hirahara, Yuka ; Miyazaki, Takashi. / High-Mg adakite and low-Ca boninite from a bonin fore-arc seamount : Implications for the reaction between slab melts and depleted mantle. In: Journal of Petrology. 2013 ; Vol. 54, No. 6. pp. 1149-1175.
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abstract = "Initial subduction-related boninitic magmatism occurred between 48 and 44 Ma in the Izu-Bonin-Mariana (IBM) arc. High-Mg adakites and low-Ca boninites have been dredged from the Bonin Ridge fore-arc seamount. Whole-rock 40Ar/39Ar ages suggest that the boninite (44·0±1·4Ma) and adakite (43·1±1·0 and 40·8± 0·8 Ma) magmatism overlapped, or that the adakite magmatism occurred slightly later than the boninite magmatism. The low-Ca boninites are high-Mg andesites and exhibit U-shaped rare earth element (REE) patterns with an elevated average Mg# of 0·78 [Mg#=Mg/(Mg+Fe) molar ratio] and Ni content of 667 ppm.The high-Mg adakites are andesitic to dacitic in composition; they exhibit markedly high Sr contents and lowYcontents and are highly enriched in light REE but depleted in heavy REE, with an average Mg#of 0·79 and Ni content of 433 ppm. A geochemical mass-balance model (Arc Basalt Simulator Version 3) indicates that both magma types could be generated by partial melting of a depleted mantle source fluxed by water-rich slab-derived melts in a hot subduction environment, comparable with the present-day South Chile (ridge subduction) or Southwest Japan (young slab subduction) arcs. An extremely high slab melt flux of 22{\%} is required for the formation of the high-Mg adakite, whereas a low flux of 3{\%} is sufficient for the low-Ca boninite.The low-Ca boninite requires a high-temperature shallow slab (854°C, 2·7 GPa on average), consisting of altered oceanic crust of the Pacific plate and volcaniclastic sediments from HIMU seamounts, and high-temperature shallow mantle melting (1216°C, 0·8 GPa) of depleted Indian mid-ocean ridge basalt (MORB)-type mantle.These modelled conditions are consistent with the occurrence of hot shallow mantle wedge melting in the initial subduction zone at the boundary between Pacific- and Indian-type mantle domains, as suggested by previous studies. In contrast, high-Mg adakite requires a higher temperature and deeper slab (929°C, 4·1GPa), with the same slab components and slightly deeper but less hot melting (1130°C, 1·1GPa) of HIMU-type depleted mantle, to satisfy the low Hf isotope ratios.This may occur because of the subsequent cooling of the mantle wedge by the establishment of the subduction system after the boninite magmatism and involvement of a small volume of an isotopically enriched mantle source embedded in the Indian-type mantle.The petrogenetic conditions provide constraints for reconstructing the tectonic settings of the early IBM arc. The hot subduction model would be consistent with the tectonic models with regard to the initiation of subduction associated with fore-arc spreading; this allowed the upwelling of the asthenospheric mantle to generate slab melts from the old Pacific plate slab and hot shallow mantle melting by slab melt fluxing for both boninite and adakite activities.",
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author = "Li, {Yi Bing} and Kimura, {Jun Ichi} and Shiki Machida and Teruaki Ishii and Akira Ishiwatari and Shigenori Maruyama and Qiu, {Hua Ning} and Tsuyoshi Ishikawa and Yasuhiro Kato and Satoru Haraguchi and Naoto Takahata and Yuka Hirahara and Takashi Miyazaki",
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pages = "1149--1175",
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TY - JOUR

T1 - High-Mg adakite and low-Ca boninite from a bonin fore-arc seamount

T2 - Implications for the reaction between slab melts and depleted mantle

AU - Li, Yi Bing

AU - Kimura, Jun Ichi

AU - Machida, Shiki

AU - Ishii, Teruaki

AU - Ishiwatari, Akira

AU - Maruyama, Shigenori

AU - Qiu, Hua Ning

AU - Ishikawa, Tsuyoshi

AU - Kato, Yasuhiro

AU - Haraguchi, Satoru

AU - Takahata, Naoto

AU - Hirahara, Yuka

AU - Miyazaki, Takashi

PY - 2013

Y1 - 2013

N2 - Initial subduction-related boninitic magmatism occurred between 48 and 44 Ma in the Izu-Bonin-Mariana (IBM) arc. High-Mg adakites and low-Ca boninites have been dredged from the Bonin Ridge fore-arc seamount. Whole-rock 40Ar/39Ar ages suggest that the boninite (44·0±1·4Ma) and adakite (43·1±1·0 and 40·8± 0·8 Ma) magmatism overlapped, or that the adakite magmatism occurred slightly later than the boninite magmatism. The low-Ca boninites are high-Mg andesites and exhibit U-shaped rare earth element (REE) patterns with an elevated average Mg# of 0·78 [Mg#=Mg/(Mg+Fe) molar ratio] and Ni content of 667 ppm.The high-Mg adakites are andesitic to dacitic in composition; they exhibit markedly high Sr contents and lowYcontents and are highly enriched in light REE but depleted in heavy REE, with an average Mg#of 0·79 and Ni content of 433 ppm. A geochemical mass-balance model (Arc Basalt Simulator Version 3) indicates that both magma types could be generated by partial melting of a depleted mantle source fluxed by water-rich slab-derived melts in a hot subduction environment, comparable with the present-day South Chile (ridge subduction) or Southwest Japan (young slab subduction) arcs. An extremely high slab melt flux of 22% is required for the formation of the high-Mg adakite, whereas a low flux of 3% is sufficient for the low-Ca boninite.The low-Ca boninite requires a high-temperature shallow slab (854°C, 2·7 GPa on average), consisting of altered oceanic crust of the Pacific plate and volcaniclastic sediments from HIMU seamounts, and high-temperature shallow mantle melting (1216°C, 0·8 GPa) of depleted Indian mid-ocean ridge basalt (MORB)-type mantle.These modelled conditions are consistent with the occurrence of hot shallow mantle wedge melting in the initial subduction zone at the boundary between Pacific- and Indian-type mantle domains, as suggested by previous studies. In contrast, high-Mg adakite requires a higher temperature and deeper slab (929°C, 4·1GPa), with the same slab components and slightly deeper but less hot melting (1130°C, 1·1GPa) of HIMU-type depleted mantle, to satisfy the low Hf isotope ratios.This may occur because of the subsequent cooling of the mantle wedge by the establishment of the subduction system after the boninite magmatism and involvement of a small volume of an isotopically enriched mantle source embedded in the Indian-type mantle.The petrogenetic conditions provide constraints for reconstructing the tectonic settings of the early IBM arc. The hot subduction model would be consistent with the tectonic models with regard to the initiation of subduction associated with fore-arc spreading; this allowed the upwelling of the asthenospheric mantle to generate slab melts from the old Pacific plate slab and hot shallow mantle melting by slab melt fluxing for both boninite and adakite activities.

AB - Initial subduction-related boninitic magmatism occurred between 48 and 44 Ma in the Izu-Bonin-Mariana (IBM) arc. High-Mg adakites and low-Ca boninites have been dredged from the Bonin Ridge fore-arc seamount. Whole-rock 40Ar/39Ar ages suggest that the boninite (44·0±1·4Ma) and adakite (43·1±1·0 and 40·8± 0·8 Ma) magmatism overlapped, or that the adakite magmatism occurred slightly later than the boninite magmatism. The low-Ca boninites are high-Mg andesites and exhibit U-shaped rare earth element (REE) patterns with an elevated average Mg# of 0·78 [Mg#=Mg/(Mg+Fe) molar ratio] and Ni content of 667 ppm.The high-Mg adakites are andesitic to dacitic in composition; they exhibit markedly high Sr contents and lowYcontents and are highly enriched in light REE but depleted in heavy REE, with an average Mg#of 0·79 and Ni content of 433 ppm. A geochemical mass-balance model (Arc Basalt Simulator Version 3) indicates that both magma types could be generated by partial melting of a depleted mantle source fluxed by water-rich slab-derived melts in a hot subduction environment, comparable with the present-day South Chile (ridge subduction) or Southwest Japan (young slab subduction) arcs. An extremely high slab melt flux of 22% is required for the formation of the high-Mg adakite, whereas a low flux of 3% is sufficient for the low-Ca boninite.The low-Ca boninite requires a high-temperature shallow slab (854°C, 2·7 GPa on average), consisting of altered oceanic crust of the Pacific plate and volcaniclastic sediments from HIMU seamounts, and high-temperature shallow mantle melting (1216°C, 0·8 GPa) of depleted Indian mid-ocean ridge basalt (MORB)-type mantle.These modelled conditions are consistent with the occurrence of hot shallow mantle wedge melting in the initial subduction zone at the boundary between Pacific- and Indian-type mantle domains, as suggested by previous studies. In contrast, high-Mg adakite requires a higher temperature and deeper slab (929°C, 4·1GPa), with the same slab components and slightly deeper but less hot melting (1130°C, 1·1GPa) of HIMU-type depleted mantle, to satisfy the low Hf isotope ratios.This may occur because of the subsequent cooling of the mantle wedge by the establishment of the subduction system after the boninite magmatism and involvement of a small volume of an isotopically enriched mantle source embedded in the Indian-type mantle.The petrogenetic conditions provide constraints for reconstructing the tectonic settings of the early IBM arc. The hot subduction model would be consistent with the tectonic models with regard to the initiation of subduction associated with fore-arc spreading; this allowed the upwelling of the asthenospheric mantle to generate slab melts from the old Pacific plate slab and hot shallow mantle melting by slab melt fluxing for both boninite and adakite activities.

KW - Arc Basalt simulator version 3

KW - Bonin fore-arc seamount

KW - Depleted mantle

KW - High-Mg adakite

KW - Low-Ca boninite

KW - Slab melt

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