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~(40)Ar/~(39)Ar同位素年龄测定,获得南天山蛇绿混杂岩基质黑云母石英片岩单矿物黑云母的两个坪年龄分别为(370.0±4.8)Ma和(259.0±3.3)Ma;中天山南缘长英质糜棱岩单矿物黑云母的坪年龄为(250.5±7.9)Ma,二云母花岗岩单矿物白云母的坪年龄为(348.9±0.3)Ma。结合南天山古生代沉积特征和塔里木及伊犁-哈萨克斯坦板块古地磁数据的综合分析,提出南天山晚泥盆世至石炭纪早期完成向伊犁-哈萨克斯坦板块的B型俯冲,中-晚二叠世进行陆内A型俯冲造山的板块碰撞演化模式。
The age of the Ar / 39Ar isotopic dating of ~ (40) Ar / ~ (39) Ar shows that the biotite age of single mineral biotite from the southern Tianshan ophiolite mélanges is (370.0 ± 4.8) Ma and (259.0 ± 3.3) Ma. The plateau age of mono-mineral biotite of Changling mylonite in the southern margin of the Central Tianshan Mountains is (250.5 ± 7.9) Ma, and that of mono-mica muscovite is (348.9 ± 0.3) Ma. Based on the analysis of Paleozoic sedimentary characteristics in South Tianshan and paleomagnetic data in Tarim and Ili-Kazakhstan plates, it is proposed that the B-type subduction, middle-late Permian of the Tianshan-Ili-Kazakhstan plate from the Late Devonian to the Early Carboniferous in South Tianshan A continental subduction orogeny plate collision evolution model.