【摘要】 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。更多还原

【Abstract】 The Tarim Basin is the biggest sedimentary basin in China, and it will also be an important base of petroleum industry in the future. There fore, it is very significant to study the evolution and formation of the Tarim Basin- Through systematic investigations of field geology, drilling records, geophysical results and isotope geology, the occurrence of a Permian intermediate-acid igneous rock zone in the northern part of the Tarim Basin has been confirmed. This intermediateacid igneous rock zone consists of andesite, rhyolite, granodiorite, granite, granophyre and tuff,and their isotope ages are 247. 5 ±0. 3 Ma and 287. 6± 2. 8 Ma. Based on the petrology, petrochemistry and geochemistry data of andesite, rhyolite, granodiorite, granite, granophyre and tuff,the authors hold that they belong to the island-arc-type igneous rocks. In combination of the results of geological investigations at the boundary of the Tarim Basin and in the Tianshan Mountain, it is also concluded that this Permian igneous rock zone was the result of Permian A-type subduction of the middle Tianshan island-arc at the northern boundary of the Tarim Basin. This discovery is very important for us to identify the tectonic evolution and formation of oil and gas in the Tarim Basin during the Late Paleozoic.更多还原