准噶尔盆地东北缘卡姆斯特地区下侏罗统中的放射虫硅质岩砾石及其放射虫动物群

克拉麦里造山带位于准噶尔盆地东北缘,是中亚构造框架中一个非常重要的构造单元,研究工作较多,但对其演化历史一直存在不同认识。本文报道了阿勒泰卡姆斯特地区下侏罗统三工河组中的紫红色放射虫硅质岩砾石及其放射虫动物群,其中最新的放射虫化石年代为维宪早期,据此推论克拉麦里洋盆封闭于早石炭世晚期,克拉麦里造山带在侏罗纪早期发生快速隆升。

Pebbles in radiolarian cherts from the Lower Jurassic in the Kamusite area at the northeastern margin of the Junggar basin, Xinjiang, China and the radiolarian fauna therein

The Kelamaili orogenic belt, located on the northeastern margin of the Junggar basin, is an important tectonic unit in the Central Asian tectonic framework. Divergent views have long existed as to its evolutionary history though much study has been conducted. This paper reports the pebbles of purplish red radiolarian cherts in the Lower Jurassic Sangonghe Formation in the Kamusite area, northern Xinjiang, and radiolarian fauna therein. The latest radiolarians are early Visean in age. It is inferred thus that the Kelamaili oceanic basin closed in the late Early Carboniferous and that the Kelamaili orogenic belt was uplifted rapidly during the Early Jurassic.