论文部分内容阅读
青藏高原东缘地区发育了完整的晚新生代湖相、黄土、红土和冰川沉积系列,不同成因的沉积物记录了晚新生代以来古环境时空变迁的信息。上新世昔格达湖相沉积发育于4.2～2.6MaBP,具有9个冷—暖气候环境变化阶段。川西风尘堆积始于1.15MaBP,连续记录了14个古季风变化旋回,成都平原红土记录了1.13Ma来的5个古环境演化阶段。青藏高原东缘发育了约4.3MaBP的老冰期,第四纪时期出现了5次极端古气候事件,对应为5期冰期。
The complete Late Cenozoic lacustrine, loess, laterite and glacial sedimentary series developed in the eastern margin of the Qinghai-Tibet Plateau. Sediments of different origin record the information of the paleoenvironmental changes since the Late Cenozoic. The Pliocene Xigeda lacustrine deposits developed at 4.2 ~ 2.6MaBP with 9 cold-warm climatic changes. The dust accumulation in western Sichuan began at 1.15MaBP, recorded 14 monsoon cycles continuously, and the red beds in Chengdu Plain recorded five stages of paleoenvironmental evolution from 1.13Ma. The eastern margin of the Qinghai-Tibet Plateau developed about 4.3MaBP of the Oligocene, the Quaternary period there have been five extreme paleoclimate events, corresponding to five glaciations.