Geochemistry and Petrogenesis of Silicic Magmas in the Intra-Oceanic Kermadec Arc
- Barker, S.J.
- Wilson, C.J.N.
- Baker, J.A.
- Millet, M-A.
- Rotella, M.D.
- Wright, I.C.
- Wysoczanski, R.J.
DOIAbstract
The geochemistry of pyroclasts sampled from four volcanoes along the Kermadec arc in the SW Pacific is used to investigate the genesis of silicic magmas in a young (<2 Myr), archetypical intra-oceanic arc setting. Raoul, Macauley and Raoul SW volcanoes in the northern Kermadec arc, and Healy volcano in the southern Kermadec arc have all recently erupted dacitic to rhyolitic crystal-poor pumice. In addition to whole-rock analyses, we present a detailed study of mineral and glass chemistries to highlight the complex structure of the Kermadec magmatic systems. Major and trace element bulk-rock compositions mostly fall into relatively narrow compositional ranges, forming discrete groups by eruption for Raoul, and varying with relative crystal c...
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