Feature of Zedong podiform chromitite, eastern Yarlung-Zangbo suture zone in Tibet

The Zedong ophiolite is in the eastern Yarlung-Zangbo suture zone (YZSZ) of Tibet, which consists chiefly of mantle peridotite, with lesser amounts of pyroxenite and gabbro. Seven small, lenticular bodies of chromitite ore have been found in the harzburgite, with ore textures ranging from massive to disseminate to sparsely disseminate. Individual ore bodies are 0.5 similar to 3m long, 0.2 similar to 1m wide and strick NW, parallel to the main structure of the peridotite, both of them are high-Cr chromitite (Cr-# = 67. 9 similar to 88. 5). The mineralogy and geochemistry of the Zedong peridotites suggest that they formed originally at a mid-ocean ridge (MOR) and were later modified by suprasubduction zone (SSZ) melts. Platinum group elements (PGE) of Zedong ophiolite have negative slope patterns with enrich Os, Rh, Pd, loss of Ir, Ru and Pt, indicating the process of modified by melt/fluid. Compare to Luobusa podiform chromitite and peridotite in mineral assemblages, mineral chemistry and geochemistry show that there are many similar character, even existence a good prospecting space.