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研究发现塔里木盆地北部发育一条二叠纪中酸性火成岩带，岩性主要有中酸性的安山岩、英安岩、流纹岩、花岗闪长岩、花岗岩、花岗斑岩、凝灰岩等，同位素年代为247．5±0．3～287．6±2．8Ma，属于岛弧火成岩。结合盆地周边的地质调查结果和天山内部晚古生代地质特征研究结果，认为中酸性火成岩带是二叠纪时中天山弧向塔里木盆地发生“A”俯冲的产物。
The study found that a Permian intermediate-acid igneous belt developed in the northern part of the Tarim Basin. There are mainly intermediate-acid andesite, dacite, rhyolite, granodiorite, granite, granite porphyry and tuff, with isotopic age 247.5 ± 0.3 ~ 287.6 ± 2.8Ma, belonging to island arc igneous rocks. Based on the results of geological survey around the basin and the late Paleozoic geological features in the Tianshan Mountains, it is concluded that the intermediate-acid igneous zone is the product of the “A” subduction occurring in the mid-Tianshan arc to the Tarim Basin during the Permian.