PIXE and EMP analyses of volcanites from Nea Kameni island (Aegean Sea, Greece)

Abstract

The major and trace element compositions of several minerals and their surrounding groundmass in the volcanic rocks from the post-caldera Nea-Kameni island of the Santorini volcanic complex, Aegean Sea, have been determined, in-situ with particle-induced X-ray emission (PIXE) and wavelength dispersive X-ray analysis with an electron microprobe (EMP). The lavas are typically calc-alkaline dacites. All samples are porphyritic with a phenocryst mineralogy dominated by plagioclase, augite, hyperstene and Ti-magnetite. The phenocrysts range in size from 200 μm to 2.5 mm. The PIXE and EMP analyses were done on sections polished with diamond paste