Abstract: Abstract: In Shangri-La County of Yunnan Province, the authors documented an ophiolitic mélange which is composed of mafic-ultramafic cumulate rocks, diabase-gabbro dykes, basalts and banded cherts. On the basis of petrological observations and mineral compositions of clinopyroxenes from the mafic-ultramafic cumulate rocks and basalts, the clinopyrixenes were divided into two groups, one group is rich in magnesium and depleted in iron while the other group is rich in calc. Both of the two groups of clinopyroxenes belong to augites, whose parental magma was sub-alkaline tholeitic basalt. Cation substitution features indicate that the augites were formed under the condition of high temperature and low pressure. T-P calculations show that the augites were formed at 986 to 1118 °C and 0.18 GP to 0.22 GP. It is suggested that the Luoji mélange is probably a part of the Garzê-Litang ophiolite.