Highly siderophile elements in mantle sulfides: in situ LAM-ICPMS analysis

摘要: The geochemistry of the siderophile and chalcophile elements potentially carries large amounts of information on processes in mantle-derived rocks. In particular, the Platinum Group Elements (PGE), which are classified with Au and Re as highly sideophile elements (HSE) may be even more useful than the more commonly used REE. Sulfide phases are thought to be the main hosts for the HSE in mantle rocks; PGE contents on the order of tens of ppm have been reported for sulfide inclusions in peridotite-paragenesis diamonds [1] and for sulfide fractions from the Lherz orogenic massif [2]. However these two studies have yielded contrasting chondrrite-normalised PGE patterns; sulfides in diamond have high IPGE (Os, Ir and Ru) contents and Pd/Ir N< 1, and" massif" sulfides have lower IPGE contents and Pd/Ir N 1.We have determined the HSE (PGE+ Au) contents of single mantle sulfide grains using a custom-built …