Magmatic Response to Subduction Initiation: Part 1. Fore-arc Basalts of the Izu-Bonin Arc From IODP Expedition 352

John W. Shervais, Mark Reagan, Emily Haugen, Renat R. Almeev, Julian A. Pearce, Julie Prytulak, Jeffrey G. Ryan, Scott A. Whattam, Marguerite Godard, Timothy Chapman, Hongyan Li, Walter Kurz, Wendy R. Nelson, Daniel Heaton, Maria Kirchenbaur, Kenji Shimizu, Tetsuya Sakuyama, Yibing Li, Scott K. Vetter

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The Izu-Bonin-Mariana (IBM) fore arc preserves igneous rock assemblages that formed during subduction initiation circa 52 Ma. International Ocean Discovery Program (IODP) Expedition 352 cored four sites in the fore arc near the Ogasawara Plateau in order to document the magmatic response to subduction initiation and the physical, petrologic, and chemical stratigraphy of a nascent subduction zone. Two of these sites (U1440 and U1441) are underlain by fore-arc basalt (FAB). FABs have mid-ocean ridge basalt (MORB)-like compositions, however, FAB are consistently lower in the high-field strength elements (TiO2, P2O5, Zr) and Ni compared to MORB, with Na2O at the low end of the MORB field and FeO* at the high end. Almost all FABs are light rare earth element depleted, with low total REE, and have low ratios of highly incompatible to less incompatible elements (Ti/V, Zr/Y, Ce/Yb, and Zr/Sm) relative to MORB. Chemostratigraphic trends in Hole U1440B are consistent with the uppermost lavas forming off axis, whereas the lower lavas formed beneath a spreading center axis. Axial magma of U1440B becomes more fractionated upsection; overlying off-axis magmas return to more primitive compositions. Melt models require a two-stage process, with early garnet field melts extracted prior to later spinel field melts, with up to 23% melting to form the most depleted compositions. Mantle equilibration temperatures are higher than normal MORB (1,400 °C–1,480 °C) at relatively low pressures (1–2 GPa), which may reflect an influence of the Manus plume during subduction initiation. Our data support previous models of FAB origin by decompression melting but imply a source more depleted than normal MORB source mantle.

Original languageEnglish
JournalGeochemistry, Geophysics, Geosystems
DOIs
Publication statusAccepted/In press - 2019 Jan 1

Fingerprint

expeditions
mid-ocean ridge basalt
basalt
oceans
subduction
mid-ocean ridges
arcs
ocean
melt
phosphorus pentoxide
rare earth element
FORTRAN
melting
spreading center
Earth mantle
Melting
decompression
Chemical analysis
mantle source
spinel

Keywords

  • Forearc basalts
  • Izu-Bonin forearc
  • Joides Resolution
  • ophiolites
  • subduction initiation

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Cite this

Shervais, J. W., Reagan, M., Haugen, E., Almeev, R. R., Pearce, J. A., Prytulak, J., ... Vetter, S. K. (Accepted/In press). Magmatic Response to Subduction Initiation: Part 1. Fore-arc Basalts of the Izu-Bonin Arc From IODP Expedition 352. Geochemistry, Geophysics, Geosystems. https://doi.org/10.1029/2018GC007731

Magmatic Response to Subduction Initiation : Part 1. Fore-arc Basalts of the Izu-Bonin Arc From IODP Expedition 352. / Shervais, John W.; Reagan, Mark; Haugen, Emily; Almeev, Renat R.; Pearce, Julian A.; Prytulak, Julie; Ryan, Jeffrey G.; Whattam, Scott A.; Godard, Marguerite; Chapman, Timothy; Li, Hongyan; Kurz, Walter; Nelson, Wendy R.; Heaton, Daniel; Kirchenbaur, Maria; Shimizu, Kenji; Sakuyama, Tetsuya; Li, Yibing; Vetter, Scott K.

In: Geochemistry, Geophysics, Geosystems, 01.01.2019.

Research output: Contribution to journalArticle

Shervais, JW, Reagan, M, Haugen, E, Almeev, RR, Pearce, JA, Prytulak, J, Ryan, JG, Whattam, SA, Godard, M, Chapman, T, Li, H, Kurz, W, Nelson, WR, Heaton, D, Kirchenbaur, M, Shimizu, K, Sakuyama, T, Li, Y & Vetter, SK 2019, 'Magmatic Response to Subduction Initiation: Part 1. Fore-arc Basalts of the Izu-Bonin Arc From IODP Expedition 352', Geochemistry, Geophysics, Geosystems. https://doi.org/10.1029/2018GC007731
Shervais, John W. ; Reagan, Mark ; Haugen, Emily ; Almeev, Renat R. ; Pearce, Julian A. ; Prytulak, Julie ; Ryan, Jeffrey G. ; Whattam, Scott A. ; Godard, Marguerite ; Chapman, Timothy ; Li, Hongyan ; Kurz, Walter ; Nelson, Wendy R. ; Heaton, Daniel ; Kirchenbaur, Maria ; Shimizu, Kenji ; Sakuyama, Tetsuya ; Li, Yibing ; Vetter, Scott K. / Magmatic Response to Subduction Initiation : Part 1. Fore-arc Basalts of the Izu-Bonin Arc From IODP Expedition 352. In: Geochemistry, Geophysics, Geosystems. 2019.
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