Basalt derived from highly refractory mantle sources during early Izu-Bonin-Mariana arc development

He Li; Richard J. Arculus; Osamu Ishizuka; Rosemary Hickey-Vargas; Gene M. Yogodzinski; Anders McCarthy; Yuki Kusano; Philipp A. Brandl; Ivan P. Savov; Frank J. Tepley; Weidong Sun

doi:10.1038/s41467-021-21980-0

Basalt derived from highly refractory mantle sources during early Izu-Bonin-Mariana arc development

He Li^*
, Richard J. Arculus^*
, Osamu Ishizuka
, Rosemary Hickey-Vargas
, Gene M. Yogodzinski
, Anders McCarthy
, Yuki Kusano
, Philipp A. Brandl
, Ivan P. Savov
, Frank J. Tepley
, Weidong Sun^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

47 Citations (Scopus)

Abstract

The magmatic character of early subduction zone and arc development is unlike mature systems. Low-Ti-K tholeiitic basalts and boninites dominate the early Izu-Bonin-Mariana (IBM) system. Basalts recovered from the Amami Sankaku Basin (ASB), underlying and located west of the IBM’s oldest remnant arc, erupted at ~49 Ma. This was 3 million years after subduction inception (51-52 Ma) represented by forearc basalt (FAB), at the tipping point between FAB-boninite and typical arc magmatism. We show ASB basalts are low-Ti-K, aluminous spinel-bearing tholeiites, distinct compared to mid-ocean ridge (MOR), backarc basin, island arc or ocean island basalts. Their upper mantle source was hot, reduced, refractory peridotite, indicating prior melt extraction. ASB basalts transferred rapidly from pressures (~0.7-2 GPa) at the plagioclase-spinel peridotite facies boundary to the surface. Vestiges of a polybaric-polythermal mineralogy are preserved in this basalt, and were not obliterated during persistent recharge-mix-tap-fractionate regimes typical of MOR or mature arcs.

Original language	English
Article number	1723
Journal	Nature Communications
Volume	12
Issue number	1
DOIs	https://doi.org/10.1038/s41467-021-21980-0
Publication status	Published - 1 Dec 2021

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title = "Basalt derived from highly refractory mantle sources during early Izu-Bonin-Mariana arc development",

abstract = "The magmatic character of early subduction zone and arc development is unlike mature systems. Low-Ti-K tholeiitic basalts and boninites dominate the early Izu-Bonin-Mariana (IBM) system. Basalts recovered from the Amami Sankaku Basin (ASB), underlying and located west of the IBM{\textquoteright}s oldest remnant arc, erupted at \textasciitilde{}49 Ma. This was 3 million years after subduction inception (51-52 Ma) represented by forearc basalt (FAB), at the tipping point between FAB-boninite and typical arc magmatism. We show ASB basalts are low-Ti-K, aluminous spinel-bearing tholeiites, distinct compared to mid-ocean ridge (MOR), backarc basin, island arc or ocean island basalts. Their upper mantle source was hot, reduced, refractory peridotite, indicating prior melt extraction. ASB basalts transferred rapidly from pressures (\textasciitilde{}0.7-2 GPa) at the plagioclase-spinel peridotite facies boundary to the surface. Vestiges of a polybaric-polythermal mineralogy are preserved in this basalt, and were not obliterated during persistent recharge-mix-tap-fractionate regimes typical of MOR or mature arcs.",

author = "He Li and Arculus, \{Richard J.\} and Osamu Ishizuka and Rosemary Hickey-Vargas and Yogodzinski, \{Gene M.\} and Anders McCarthy and Yuki Kusano and Brandl, \{Philipp A.\} and Savov, \{Ivan P.\} and Tepley, \{Frank J.\} and Weidong Sun",

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doi = "10.1038/s41467-021-21980-0",

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AU - Li, He

AU - Arculus, Richard J.

AU - Ishizuka, Osamu

AU - Hickey-Vargas, Rosemary

AU - Yogodzinski, Gene M.

AU - McCarthy, Anders

AU - Kusano, Yuki

AU - Brandl, Philipp A.

AU - Savov, Ivan P.

AU - Tepley, Frank J.

AU - Sun, Weidong

PY - 2021/12/1

Y1 - 2021/12/1

N2 - The magmatic character of early subduction zone and arc development is unlike mature systems. Low-Ti-K tholeiitic basalts and boninites dominate the early Izu-Bonin-Mariana (IBM) system. Basalts recovered from the Amami Sankaku Basin (ASB), underlying and located west of the IBM’s oldest remnant arc, erupted at ~49 Ma. This was 3 million years after subduction inception (51-52 Ma) represented by forearc basalt (FAB), at the tipping point between FAB-boninite and typical arc magmatism. We show ASB basalts are low-Ti-K, aluminous spinel-bearing tholeiites, distinct compared to mid-ocean ridge (MOR), backarc basin, island arc or ocean island basalts. Their upper mantle source was hot, reduced, refractory peridotite, indicating prior melt extraction. ASB basalts transferred rapidly from pressures (~0.7-2 GPa) at the plagioclase-spinel peridotite facies boundary to the surface. Vestiges of a polybaric-polythermal mineralogy are preserved in this basalt, and were not obliterated during persistent recharge-mix-tap-fractionate regimes typical of MOR or mature arcs.

AB - The magmatic character of early subduction zone and arc development is unlike mature systems. Low-Ti-K tholeiitic basalts and boninites dominate the early Izu-Bonin-Mariana (IBM) system. Basalts recovered from the Amami Sankaku Basin (ASB), underlying and located west of the IBM’s oldest remnant arc, erupted at ~49 Ma. This was 3 million years after subduction inception (51-52 Ma) represented by forearc basalt (FAB), at the tipping point between FAB-boninite and typical arc magmatism. We show ASB basalts are low-Ti-K, aluminous spinel-bearing tholeiites, distinct compared to mid-ocean ridge (MOR), backarc basin, island arc or ocean island basalts. Their upper mantle source was hot, reduced, refractory peridotite, indicating prior melt extraction. ASB basalts transferred rapidly from pressures (~0.7-2 GPa) at the plagioclase-spinel peridotite facies boundary to the surface. Vestiges of a polybaric-polythermal mineralogy are preserved in this basalt, and were not obliterated during persistent recharge-mix-tap-fractionate regimes typical of MOR or mature arcs.

UR - https://www.scopus.com/pages/publications/85102851393

U2 - 10.1038/s41467-021-21980-0

DO - 10.1038/s41467-021-21980-0

M3 - Article

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VL - 12

JO - Nature Communications

JF - Nature Communications

IS - 1

M1 - 1723

ER -

Basalt derived from highly refractory mantle sources during early Izu-Bonin-Mariana arc development

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