关键词: 塔里木盆地东北部, 砂岩骨架矿物, 物源分析, 再旋回造山带

Abstract: The filled sequence of Silurian-Devonian and Mesozoic-Cenozoic in northeastern Tarim basin are composed of siliceous clastic rocks. Following statistical analysis of minerals in sandstone with point counting method cobined with stud of reginal tectonic setting it is considered that source area of Kuqa depression is South Tianshan oxygen and the filled sequence at depocenter of subsidence recorded the unroofed history of it. During Silurian-Devonian periods, the clastic rocks in Northeastern Tarim depression were sourced from old Northern Tarim uplift to the north Ordovician during the midiriod of Caledonian orogeny and Kuluktag uplift at the northeastern corner whereas. during Triassic-jurassic periods, Shaya uplift and Kuluktag uplift formed during the Hercynian orogeny arethe main source area. Sediments from South Tianshan orogen were deposited in the depression since Cretaceous. The type of source area varied as the depression evolved, and even sediments in the same source area could resulted in diferent mineral compositions in sandstone owing to the different transportation distances.

Key words: Northeastern Tarim basin, Matrix mineral of sandstone, Provenance analysis, Recycle orogenic belt