The origin of the fractionation of platinum-group elements in terrestrial magmas
作者： Sarah-Jane Barnes , A.J. Naldrett , M.P. Gorton
DOI: 10.1016/0009-2541(85)90076-2
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摘要: Abstract The platinum-group elements (PGE's), when chondrite normalized, have been found to be fractionated in order of descending melting point (Os, Ir, Ru, Rh, Pt, Pd and Au). Mantle-derived material (garnet lherzolite spinel xenoliths alphine peridotites) essentially unfractionated PGE patterns. Periotitic komatiites mildly patterns ( Ir = 10 ), pyroxenitic are slightly more 30 ). Both continental ocean-floor basalts highly 100 Data from intrusive rocks show a large range fractionation Pd-depleted chromities ophiolites 0.1 ) the extreme enrichment JM Reef Stillwater Complex 865 Some possible mechanisms for origin this are: alteration, partial crystal fractionation. Carbonate alteration affects Au Pt hydrothermal mobilizes Pd. Solid substitution (and associated Os Ru) into olivine chromite, during or is rejected as mechanism fractionating PGE's. It suggested; that major factor differences solubility PGE's silicate magma, Pd, Rh soluble than which form an alloy Ru forms laurite. These could fractionate During prior Fe-Ni-Cu sulphur saturation low Os, leads formation Os-Ir alloys RuS2 magma. may then settled out magma by whatever phase crystallizing remaining becomes
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