Platinum-group elements for the Kudi ophiolite, western Kunlun |
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Authors: | Zhihong Wang Quanlin Hou Jiliang Li Haihong Chen |
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Institution: | (1) Laboratory of Lithosphere Tectonic Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, China |
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Abstract: | The analyses of PGE characteristics for the Kudi ophiolite, western Kunlun, are reported in this note. The Ir-depieted anomalous
ancient upper mantle represented by the Kudi mantle peridotites had been percolated and mixed by remelted oceanic crust material
from a supra-subduction zone, leaving the rocks relatively enriched in Pd. The PGE contents in the Kudi cumulate pyroxenites
and gabbros vary from 2.4 to 23.94 ng/g, and the highest values are in pyroxenites. The Pd/lr ratios increase from the pyroxenites
to the gabbros. The PGE patterns for the Kudi cumulate rocks are steeply positively sloped. The Pd enrichment in these rocks
is similar to that in pyroxenites from the Thetford ophiolite and the Troodos ophiolite. The Kudi diabase and basalts have
low PGE contents and positively sloped PGE patterns, and are comparable with the upper pillow lavas from the Troodos ophiolite,
indicative of the environment of back-arc spreading center in a supra-subduction zone. |
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Keywords: | platinum-group elements supra-subduction zone Kudi ophiolite western Kunlun |
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