Abstract
Samples from the NiCu-sulfide mineralization of the Acoje Ophiolite block (ancient oceanic crust), Zambales, Philippines were analyzed for Pd and Se using the Heidelberg proton microprobe. The background in the PIXE spectra around the Pd peaks was nearly zero, so that even small peaks were clearly revealed. Unexpected problems in the fitting of these peaks with the SESAMX program could only be solved by modification of this program. Experimental results allow the following conclusions: Selenium concentrations and the corresponding Se/S ratios of these sulfides are in comparable orders of magnitude to magmatic sulfides from the Stillwater and Sudbury complex; Palladium traces of secondary origin were found in secondary native copper. Pd of primary origin was found in magmatically formed pentlandite (Ni,Fe) 9S 8.
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