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

Journal article
(Original article)


Publication Details

Author(s): Haase K, Lima S, Krumm S, Garbe-Schönberg D
Journal: Lithos
Publisher: Elsevier
Publication year: 2014
Volume: 210-211
Pages range: 199-208
ISSN: 0024-4937
Language: English


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.



FAU Authors / FAU Editors

Haase, Karsten Prof. Dr.
Lehrstuhl für Endogene Geodynamik
Krumm, Stefan Dr.
Lehrstuhl für Endogene Geodynamik


External institutions
Christian-Albrechts-Universität zu Kiel


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.

BibTeX: 

Last updated on 2018-10-08 at 22:56