Journal article

Diamond exploration and mantle structure imaging using PIXE microanalysis

CG Ryan, WL Griffin, TT Win

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | ELSEVIER SCIENCE BV | Published : 1996

Abstract

The compositions of garnets, sampled throughout the earth's upper mantle and carried to the surface in volcanic eruptions, show PIXE trace element signatures that reveal details of the chemistry, thermal structure, and history of fluid alteration, of their source rocks. Trace Ni concentration (5-150 ppm) is strongly temperature dependent, providing a useful geothermometer (TNi). Cr concentration can be used to estimate pressure (PCr] in Cr-saturated rocks. Trace Zn in chromite also provides a measure of temperature (TZn], and shows the extent of Cr-saturation (chromite present). For those garnets from a particular volcanic pipe originating in Cr-saturated rocks in the upper-mantle, TNi, PCr ..

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University of Melbourne Researchers