Cenozoic Evolution of Sediments and Climate Change and Response to Tectonic Uplift of the Northeaste

来源 :Acta Geologica Sinica(English Edition) | 被引量 : 0次 | 上传用户:marswood
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Through a comprehensive study of magnetostratigraphy and sedimentology of several basins in the northeastern Tibetan Plateau, we reveal that the study area mainly experienced six tectonic uplift stages at approximately 52 Ma, 34–30 Ma, 24–20 Ma, 16–12 Ma, 8–6 Ma, and 3.6–2.6 Ma. Comprehensive analyses of pollen assemblages from the Qaidam, Linxia, Xining, and West Jiuquan Basins show that the northeastern Tibetan Plateau has undergone six major changes in vegetation types and climate: 50–40 Ma for the warm-humid forest vegetation, 40–23 Ma for the warm-arid and temperate-arid forest steppe vegetation, 23–18.6 Ma for the warm-humid and temperatehumid forest vegetation, 18.6–8.5 Ma for the warm-humid and cool-humid forest steppe vegetation, 8.6–5 Ma for the temperate sub-humid savanna steppe vegetation, and 5–1.8 Ma for the cold-arid steppe vegetation. Comprehensive comparisons of tectonic uplift events inferred from sedimentary records, climatic changes inferred from pollen, and global climate changes show that in the northeastern Tibetan Plateau the climate in the Paleogene at low altitude was mainly controlled by the global climate change, while that in the Neogene interval with high altitude landscapes of mountains and basins is more controlled by altitude and morphology. Through a comprehensive study of magnetostratigraphy and sedimentology of several basins in the northeastern Tibetan Plateau, we reveal that the study area mainly experienced six tectonic uplift stages at approximately 52 Ma, 34-30 Ma, 24-20 Ma, 16-12 Ma, 8 -6 Ma, and 3.6-2.6 Ma. Comprehensive analyzes of pollen assemblages from the Qaidam, Linxia, ​​Xining, and West Jiuquan Basins show that the northeastern Tibetan Plateau has undergone six major changes in vegetation types and climate: 50-40 Ma for the warm-humid forest vegetation, 40-23 Ma for the warm-arid and temperate-arid forest steppe vegetation, 23-18.6 Ma for the warm-humid and temperatehumid forest vegetation, 18.6-8.5 Ma for the warm-humid and cool-humid forest steppe vegetation, 8.6-5 Ma for the temperate sub-humid savanna steppe vegetation, and 5-1.8 Ma for the cold-arid steppe vegetation. Comprehensive comparisons of tectonic uplift events inferred from sedimentary records, climatic changes inferred fr om pollen, and global climate changes show that in the northeastern Tibetan Plateau the climate in the Paleogene at low altitude was mainly controlled by the global climate change, while that in the Neogene interval with high altitude landscapes mountains and basins is more controlled by altitude and morphology.
其他文献
On the basis of field observations, microscopic thin-sections and laboratory data analysis of ten faults in Xuanhan County area, northeastern Sichuan Basin, cen
建筑施工行业对社会经济发展具有重要的推动作用,随着新时期各项建设的蓬勃开展,行业竞争日益激烈,只有努力加强建筑工程管理,提高工程质量,方能实现预期的目标.因此,企业应
随着我国经济的迅速发展,民众对建筑工程的要求越来越高,为了能够使人民的物质需求得到满足,一定要将建筑工程作为重点工作对象.工程质量是建筑工程的基础,因此一定要做好施
Marine strata in the Jianghan Plain area are widely distributed with a total depth of more than 8,000 m from the Upper Sinian to the Middle Triassic. Six reserv
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
建筑工程项目如火如荼,建设项目招标问题自然引起了人们的关注.由于各个建设项目的要求不同,为避免单向考虑经济效益,搞好工程质量,就有必要根据实际施工需要制定完善的投标
The Dongpu sag is located in the south of the Bohai Bay basin, China, and has abundant oil and gas reserves. To date, there has been no systematic documentation
建筑行业是我国经济发展的重要行业,虽然经济收益较高,但是施工过程中的安全隐患问题也比较多.随着建筑工程建设数量和规模的逐渐增加,建筑行业生产安全也受到人们的广泛关注
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
传统建筑工程项目管理将各个单位按照参与工程建设的时间阶段分割开来.各个单位站在各自利益角度完成各自的项目管理目标,盲目追求最低造价、最快进度的建筑工程项目管理目标