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| 1 | Formation of the Yalong Downstream Terraces in the SE Tibetan Plateau and Its Implication for the Uplift of the Plateau显示文摘The Yalong River is an important river that runs across the abruptly changing terrain of the SE Tibetan Plateau. The terraces and Quaternary sediments in its valleys preserve the information of tectonic uplift,climate changes,and landform evolution since the Middle Pleistocene. Based on geomorphological,sedimentological,and chronological investigations,6–8 terraces are identified in the lower reaches of Yalong catchment and its tributary—the Anning River. The electron spin resonance(ESR) or optically stimulated luminescence(OSL) data on the alluvial sediments in the upper portion of terraces indicate that they formed in 1.10,0.90,0.72,0.06–0.04,0.03–0.02,and 0.01 Ma. Tectonic uplift and the climatic cycle controlled the formation of the Yalong River terraces. The former dominated the dissection depths and incision rates,whereas the latter controlled the transformation between accumulation,which developed during the glacial period,and incision,which developed during the glacial-interglacial transition. The Yalong downstream incised rapidly from 1.10 to 0.72 Ma and rapidly from 0.06 Ma until the present; the terraces developed during these two periods. The incision rates in space during the two periods indicate the uplifting extent of the Jinpingshan area,which decreases toward the east and the south. The results reveal two rapidly uplifting stages in the SE Tibetan Plateau,including an accelerated uplifting since 0.06 Ma. Since the Middle Pleistocene,the tectonic uplift of the SE and NE parts of the Tibetan Plateau is synchronous,according to the same development stages of the river terraces of the Yalong downstream and the Yellow River in the Lanzhou area of the NE Tibetan Plateau. The difference in the horizontal displacement between the Xianshuihe Fault and the Anninghe Fault bend resulted in the rapid uplift of the Jinpingshan area. The incision rate for the spatial distribution of the Yalong downstream is the geomorphological response of crustal shortening and uplift differences in the SE margin block of the Tibetan Plateau. The southeastward diffusion process of the Tibetan Plateau was recorded. | HE Zexin ZHANG Xujiao QIAO Yansong BAO Shuyan LU Chunyu HE Xiangli | 2015 | Acta Geologica Sinica(English Edition)2015，89，2： | 4 |
| 2 | Chronological Link Between the Abrupt Change of the Loess Grain Size Sequence and the Formation of River Terraces on the Eastern Margin of the Qinghai-Tibetan Plateau Since the Late Early-Pleistocene显示文摘基于 magnetostratigraphy,磁性的危险性和 Garz | LIU Dongyan QIAO Yansong LI Weiran XIE Ruihuang PENG Shasha | 2011 | Acta Geologica Sinica(English Edition)2011，85，3： | 4 |
| 3 | 试论河流地貌学的新进展和趋势显示文摘河流地貌学研究河流动力的侵蚀-搬运-堆积过程(源-汇系统)、河流地貌的时空演化,及其与地球内部构造活动和地球表层气候和环境之间的相互关系。介绍了河流地貌学与表层地球系统科学的关系、研究内容和发展趋势、前沿问题和研究机遇。河流侵蚀、搬运和堆积在构造-气候相互作用中起着重要的媒介作用,是地球内部和外部相互作用的重要纽带。随着高精度数字地形模型定量分析、地表侵蚀速率的定量测定、沉积物测年以及地貌演化数值模拟等新技术和新方法的应用,促进了不同时间和空间尺度流域地形、水系发育、河流地貌动力过程、河流地貌空间分布特征及其对构造、气候和人类活动等的响应和反馈的研究。未来除了更深入地理解流域尺度物质和形态的变化规律和机制外,加强河流地貌过程的定量表达,将流域地貌研究与表层地球系统的热点科学问题相联系,进一步开展学科交叉,服务于国家战略,才能提高河流地貌学、乃至地貌学科的竞争力。 | 王先彦 于洋 | 2024 | 地质科技通报2024，43，1： | 0 |
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