摘要
KeGang ophiolite is located in Tarim Plate in the southwestern margin of the western Kunlun intermediate massif and the north side of West Kunlun trench-arc with the dividing line.In this paper,the study on rock composition of KeGang ophiolite belt and geochemical characteristics affirmed the understanding of "Trinity" ophiolite-built in KeGang ophiolite belt,from the lower part of the metamorphic peridotite phase,the central cumulate facies,light-colored granite phase,the upper part of massive gabbro-diabase phase and volcanic rocks and clastic rocks,respectively.KeGang ophiolite is orogenic type,obviously different from the Mid-ocean ridge ophiolite.The tectonic environment should be quickly extensional environment product of back-arc basin or small ocean basin of destructive continental margin.