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.
Authors with CRIS profile
Karsten Haase
Lehrstuhl für Endogene Geodynamik
Selma Sofia Martins Lima
Geozentrum Nordbayern
Stefan Krumm
Lehrstuhl für Endogene Geodynamik
Involved external institutions
Germany (DE)How to cite
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://dx.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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