南天山阿尔夏特地区科克铁克达坂组物源区大地构造背景分析

Geotectonic Setting of Provenance of the Upper Silurian Keketiekedaban Formation in Arxat, South Tianshan Mts.

南天山地区的科克铁克达坂组是保存于那拉提-红柳河缝合带南侧的一套晚志留世地层,总体出露较好,研究其物源区大地造背景对南天山造山带志留纪岩相古地理及构造背景研究具有重要意义。通过野外剖面测制,结合室内薄片鉴定及地球化学分析等工作,对科克铁克达坂组物源区构造背景进行了分析,结果显示其物源区为过渡陆壳源区、隆升基底源区,大地构造背景为稳定的被动大陆边缘。

The Upper Silurian Keketiekedaban Formation is exposed on the southern side of the Narat-Hongliuhe suture zone in the Arxat, South Tianshan Mts. The study of geotectonic setting of provenance of the Keketiekedaban Formation is of great importance to the study of the Late Silurian sedimentary facies and paleogeography and tectonic setting in the South Tianshan orogenic belt. The study indicates that the provenance was transitional continental crust and uplift basement lying in a stable passive continental margin.