论文部分内容阅读
通过对西藏定结盆地湖相沉积的野外地质调查和实测剖面,对分布于盆地内的第四纪湖相地层进行了详细的研究和划分,重新厘定了该区中更新世—晚更新世的岩石地层单元,确立了生物地层和年代地层序列。首次建立了该区第四纪中更新世—晚更新世湖相地层单位———定结群(Qp2-3D)。定结群是由中更新统叶如藏布组(Qp2ly)和上更新统麻加组(Qp3lm)2个组组成。为青藏高原湖泊演化、气候变化、古地理变迁的研究,以及第四纪地层的划分与对比等都提供了新资料。
Through the field geological survey and the measured profile of the lacustrine sediments in the Tiejian basin in Tibet, the Quaternary lacustrine strata distributed in the basin have been studied and classified in detail. The mid-Pleistocene to late Pleistocene Rock stratigraphy unit, established biostratigraphy and chronostratigraphic sequence. For the first time, the Quaternary Pleistocene-Late Pleistocene lacustrine strata units (Qp2-3D) were established in this area. The fixed-knot cluster is composed of two groups, Qp2ly and Qp3lm, of the Middle Pleistocene. It provides new information for the study of the evolution of the lakes in the Tibetan Plateau, climate change, palaeogeographic changes and the division and comparison of Quaternary strata.