NDLI: Yttrium Geothermometry Applied to Garnets from Different Metamorphic Grades Analysed by EPMA and µ-PIXE Techniques

Content Provider	Springer Nature Link
Author	Borghi, Alessandro Compagni, Roberto Cossio, Roberto Giuntini, Lorenzo Massi, Mirko Olmi, Filippo Santo, Alba P. Vaggelli, Gloria
Copyright Year	2006
Abstract	We present a multi-analytical and multi-instrumental approach to a petrologic study of garnets from metapelites characterized by different metamorphic grades. The comparison between major, minor and trace element (Y) distribution in garnets crystallized at different temperatures was performed by electron microprobe (EDS and WDS) and the Proton Induced X-ray Emission microprobe (µ-PIXE).Two garnet samples were selected from metapelite rocks at different metamorphic grades from the tectonic unit of Stilo, Calabrian–Peloritanian Arc, Southern Italy. Quantitative spot analysis profiles and compositional X-ray maps of major elements and yttrium are reported.The major element zoning of garnets is mostly characterized by a smoothed and gradual concentric variation of all elements from core to rim. The Y concentration reveals a marked zoning with its distribution decreasing from about 7000 ppm to about 100 ppm from core to rim, respectively. The precise determination of the Y content by µ-PIXE technique allowed us to better define the rock thermal history, by applying the Y geothermometer. In particular, a common starting temperature of about 450 °C was calculated for the beginning of the garnet growth from all over the unit, but different temperatures in the range from 520 °C to 670 °C were estimated for the peak event in garnets from different areas, in agreement with the P–T values given by the main rock mineral assemblages, reflecting a different metamorphic grade.
Starting Page	105
Ending Page	112
Page Count	8
File Format	PDF
ISSN	00263672
Journal	Microchimica Acta
Volume Number	155
Issue Number	1-2
e-ISSN	14365073
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-04-28
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Analytical Chemistry Inorganic Chemistry Physical Chemistry Characterization and Evaluation Materials Monitoring/Environmental Analysis/Environmental Ecotoxicology
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry

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