Micro-PIXE has been applied to a specific petrologic problem particularly affected by the limitation of other techniques. Selected garnet crystals from metapelitic rock samples equilibrated under high pressure low temperature metamorphic conditions coming from Western Alps were analysed. The yttrium concentration reveals a strongly (two order of magnitude) zoned distribution decreasing from core to rim in garnet crystals. Quantitative spot analyses range from about 1500 ppm at the core to 50 ppm at the rim, The extremely precise (LOD < 5 ppm) Y content determination by micro-PIXE technique allowed to better define the thermal rock history, applying a recently calibrated geothermometer.
A mineralogical application of micro-PIXE technique: Yttrium zoning in garnet from metamorphic rocks and its petrologic meaning.
MAZZOLI, CLAUDIO
2002
Abstract
Micro-PIXE has been applied to a specific petrologic problem particularly affected by the limitation of other techniques. Selected garnet crystals from metapelitic rock samples equilibrated under high pressure low temperature metamorphic conditions coming from Western Alps were analysed. The yttrium concentration reveals a strongly (two order of magnitude) zoned distribution decreasing from core to rim in garnet crystals. Quantitative spot analyses range from about 1500 ppm at the core to 50 ppm at the rim, The extremely precise (LOD < 5 ppm) Y content determination by micro-PIXE technique allowed to better define the thermal rock history, applying a recently calibrated geothermometer.
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