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Crystal Zoning as an Archive for Magma Evolution

¹ Département de Minéralogie, Université de Genève
13 rue des Maraîchers, 1205 Genève, Switzerland
E-mail: catherine.ginibre{at}terre.unige.ch
² Geowissenschaftliches Zentrum Göttinger. Abt. Geochemie
Goldschmidtstr. 1, 37077 Göttingen, Germany

Spatial compositional variations in magmatic minerals record chemical and physical changes in the magma from which they grew. Electron-beam techniques allow high-resolution imaging and quantitative analysis of this compositional archive for major, minor and some trace elements. In this way, magmatic processes such as crystallization, recharge in a magma chamber, decompression during ascent, and convection in the magma chamber can be identified and the history of magmatic systems prior to eruption reconstructed.

KEYWORDS: zoning, igneous petrology, magma chamber, electron microprobe, scanning electron microscope

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