Characteristics and Geological Significance of the East Junggar Tahaerbasitao Ophiolite Belt
The Tahaerbasitao ophiolite is located in the northwestern section of the Kalamaili subduction accretionary mafic belt,and consists of a total of five rock fragments of different sizes.Geochemistry shows that the basalts in the Tahaerbasitao ophiolite are characterised by a mild LREE deficit or overall flatness,similar to the MORB signature;The gabbroic rare earth element partitioning pattern as a whole shows flat-type features,close to MORB.Trace element N-MORB normalised spiderweb plots show that basalt and gabbro are significantly enriched in the large ionic lithophilic el-ements Sr,K,Rb,and Ba,while the high-field-strength element Nb is significantly deficient and Ta is moderately en-riched to varying degrees.It is believed that the Tahaerbasitao ophiolite is a component of the Kalamaili mélange belt,with island arc volcanic features,and is a product of basin spreading after the Early Carboniferous arc.
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