Journal article
Sub-volcanic xenoliths from Raoul Volcano: a window on petrogenetic processes in an intra-oceanic subduction system
RC Price, IEM Smith, R Maas, RB Stewart
New Zealand Journal of Geology and Geophysics | TAYLOR & FRANCIS LTD | Published : 2017
Abstract
Gabbroic and tonalitic xenoliths from c. 3 ka pyroclastic deposits on Raoul Island in the intra-oceanic Kermadec arc are samples of shallow crust formed < 2 Ma ago. Gabbros are orthocumulates composed of plagioclase, augite and orthopyroxene. Some trace element and isotopic characteristics are similar to those observed in Raoul mafic lavas, but SiO2 and incompatible trace element abundances are lower. The rare earth element (REE) patterns of the gabbros manifest strong positive Eu anomalies indicative of cumulate plagioclase. Tonalitic xenoliths comprise plagioclase, quartz, magnesiohornblende, magnetite, ilmenite and titanite. Their REE patterns feature strong negative Eu anomalies, which c..
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Awarded by University of Auckland
Funding Acknowledgements
The rocks described in this article were collected on an expedition to the northern Kermadec arc that was funded by the New Zealand Lottery Grants Board (Lottery Science Grant SR022590). The project also received financial support from the University of Auckland, University of Waikato, Massey University and University of Melbourne.