摘要：

通过对罗布泊东部阿奇克谷地中部AK1孔及露头剖面第四纪沉积特征的综合研究，初步分析了阿奇克谷地第四纪以来的沉积环境与古地理演化。结果表明，阿奇克谷地第四纪古地理受上新世以来区域构造控制，谷地两侧北山及阿尔金山的隆升，一方面为其提供了丰富的物质来源，同时也控制了其沉积环境的演化。其中第四纪以来阿奇克谷地沉积环境有两次明显变化，早更新世中期谷地中开始出现湖相沉积；中更新世晚期湖相沉积范围扩大，为罗布泊湖的大发展期。晚更新世谷地两侧普遍出现砾石层，与中更新世呈不整合接触，表明构造抬升造成湖泊退缩。晚更新世以来湖泊沉积环境波动变化加快。

Abstract:

According to the sedimentary sequence and stratigraphic relation from Ak1 core and outcrops around Aqike depression，it can be concluded that the basic tectonic framework of Aqike depression in the Quaternary was formed in the Tertiary when most of the eastern part of Tarim Basin was folded during the Tianshan orogeny. Quaternary palaeogeographic evolution of the Aqike depression appears to have been controlled largely by regional tectonics. Aqike depression had two stages enlarge during Quaternary. Two high-level of the lake were discovered from middle Early-Pleistocene and late Middle-Pleistocene of AK1 core, eastern Lop Nur area. The occurrence of Lake Facies in the late middle-Pleistocene means the climax of Quaternary transgressing. Rapid uplift along both sides of the depression resulted in a persistent regression as indicated by the conglomerate layer during late Pleistocene，and the environment of the Lake was fluctuant since late Pleistocene.