The Discovery And Geological Significance Of Ophiolite Tectonic Mélange In Qiuerbaboha Of E'min, Xinjiang

An ophiolite melange zone in the Qiuerbaboha area was identified during the geological survey carried out in the northeast of E’min County, Xinjiang, which is about 16km long from east to west and 2km wide from north to south, and is lens-shaped with the typical “five-in-one-body” characteristic, mainly composed by peridotite,serpentinite, crystal pyroxenite, gabbro, diabase, pillow basalts, radiolarian silicite and other rock blocks. LAICP-MS zircon U-Pb dating of diabase in the ophiolite mélange is 489.4 ± 4.2 Ma, indicating that the ophiolite was formed in the early Paleozoic and the Ree and micronutrient characteristics of different components in the ophiolite melange indicate that it was probably formed in a tectonic setting of a multi-island arc-basin system. The discovery of ophiolite melange in Qiubaerboha provides an important geological basis for the tectonic evolution of Western Junggar.