The magmatic evolution of young island arc crust observed in gabbroic to tonalitic xenoliths from Raoul Island, Kermadec Island Arc

Haase K, Lima S, Krumm S, Garbe-Schönberg D (2014)


Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2014

Journal

Publisher: Elsevier

Book Volume: 210-211

Pages Range: 199-208

DOI: 10.1016/j.lithos.2014.10.005

Abstract

We provide new geochemical and O isotope data for minerals and whole rocks of a suite of gabbroic to tonalitic xenoliths from Raoul Island in the Kermadec island arc. The plagioclase, olivine and clinopyroxene compositions are similar to those observed in the Raoul Island lavas supporting a close relationship of the plutonic and volcanic rocks by crystal fractionation. Plagioclase in gabbros is significantly more An-rich than in similar rocks from oceanic spreading axes reflecting higher water contents in the island arc magmas. Incompatible element and O isotope data suggest that the gabbroic rocks formed from accumulation of minerals of the ascending magmas whereas the tonalites represent highly evolved magmas after extreme fractional crystallization. Temperatures of the magmas calculated from O isotope equilibria and pyroxene thermometers range from about 1200. °C in the mafic to 800. °C in felsic rocks. Barometry of the rocks suggests that gabbros formed between 12 and 18. km depth and tonalites shallower which is in agreement with seismic models of island arc crustal layering. The xenolith data from Raoul Island support seismic studies indicating that some portions of the Tonga-Kermadec island arc show similar layering of felsic and mafic rocks to the Izu-Bonin and the fossil Talkeetna island arcs.

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APA:

Haase, K., Lima, S., Krumm, S., & Garbe-Schönberg, D. (2014). The magmatic evolution of young island arc crust observed in gabbroic to tonalitic xenoliths from Raoul Island, Kermadec Island Arc. Lithos, 210-211, 199-208. https://doi.org/10.1016/j.lithos.2014.10.005

MLA:

Haase, Karsten, et al. "The magmatic evolution of young island arc crust observed in gabbroic to tonalitic xenoliths from Raoul Island, Kermadec Island Arc." Lithos 210-211 (2014): 199-208.

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