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青藏高原东北部是研究高原隆升和东亚季风演化的重要地区.通过对青藏高原东北部循化盆地西沟剖面新近纪河湖相沉积的磁性地层学研究,建立了西沟剖面约14.6～5.0Ma沉积物的磁极性年代框架.沉积相的分析表明,循化盆地在约14.6～5.0Ma期间总体上处于充填萎缩阶段.西沟剖面巨厚层砾岩首次出现的时间约为7.3Ma前,应是青藏高原东北部快速隆升的沉积响应.这与青藏高原在约8.0Ma前快速隆升的时间相近,进一步说明约8.0Ma前青藏高原的构造隆升具有准同时性.
The northeastern Qinghai-Tibet Plateau is an important area for studying the uplift of the plateau and the evolution of the East Asian monsoon. Based on the magnetic stratigraphic study of the Neogene sediments from the Xigou section of the Xunhua Basin in the northeastern Qinghai-Xizang Plateau, the Xigou section has been established at about 14.6-5.0 Ma sediments.The analysis of sedimentary facies shows that the Xunhua Basin is generally in the stage of filling and shrinking during about 14.6-5.0Ma.The first occurrence time of the giant and thick conglomerate in the Xigou section is about 7.3Ma, Which should be the depositional response of rapid uplift in the northeastern Qinghai-Tibet Plateau, which is similar to the rapid uplift of the Qinghai-Xizang plateau at about 8.0 Ma, further demonstrating the quasi-simultaneity of the tectonic uplift of the former Qinghai-Xizang Plateau at about 8.0 Ma.