摘要
青藏高原新生代古高度研究是地球系统科学研究中的一个热点、难点和重点,它是解决地球深部动力学、地貌地形演化和气候变化等各部分相互关系的一个关键突破口。目前以古生物和氧同位素为代表的各种古高度计被用来重建青藏高原新生代的古高度历史,但是不同的研究方法所得到的结果并不一致,关于青藏高原何时隆升到现在的海拔高度存在晚上新世、晚中新世和始新世等不同认识。因为古高度结果的差异,所以对于青藏高原新生代的构造隆升过程和动力机制也存在大的争议。本文首先详细的阐述了部分古高度计的应用原理及其各自的优缺点,收集总结了77条青藏高原新生代古高度研究的成果,梳理了目前青藏高原新生代古高度研究的历史和现状。然后在此基础上讨论了目前高原古高度研究的特点和存在的问题,即地层年代学、氧同位素和古生物古高度计结果的协调、"以点带面"、区域研究程度差异较大、替代性指标的多解性、古纬度影响、地质时期温度递减率的不确定性、全球气候变化的影响等特点和问题。最后就存在的特点和问题指出在恢复青藏高原新生代古高度时所需要完善和注意的方面,其中最重要的是注重地层年代学的可靠性。
Objectives: Study of the Cenozoic paleoaltitude on the Tibetan Plateau is a hot spot,difficulty and focus of the earth system research. It is a key to solve the relationship among the deep earth dynamics,topography evolution and climate change. However,it is still in hotly dispute about the Cenozoic tectonic uplift history. This paper summarized 77 results of the research on the Cenozoic paleoaltitude of the Tibetan Plateau and discussed its current situation. Meanwhile,pointed out the existing characterisrics and problems,and finally discussed the prospects and suggestions for the follow-up paleoaltitude research.Methods: Analyzed the application principles of some palealtitude indexes and their advantages and disadvantages;Collected and summarized the results of the research on the Cenozoic paleoaltitude of the Tibetan Plateau.Results: Collected 77 items of the paleoelevation research on the Cenozoic Tibetan Plateau and pointed out the research history and current status of the paleoelevation. In addition,eight characteristics and problems about the paleoelevation research were stated briefly, namely strata chronology, coordination of oxygen isotope and paleontological paleoaltimeter results,"from a local point record to area ",degree of regional research varying greatly,ambiguity of the surrogate indexes,influence of paleolatitude,uncertainty of the temperature lapse rates in geological time and effect of the global temperature change.Conclusions: In the future paleoelevation work,following items had better to be noticed: paying attention to the reliability of the strata chronology;applications of multidisciplinary comprehensive methods;more research on the Central Northern Tibetan Plateau;develop new paleoaltimeters;make full use of the results got from other disciplinesand combine geological evidence and simulation model.
作者
李乐意
常宏
关冲
陶亚玲
沈俊杰
秦秀玲
权春艳
常小红
LI Leyi;CHANG Hong;GUAN Chong;TAO Yalin;SHEN Junjie;QIN Xiuling;QUAN Chunyan;CHANG Xiaohong(State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an,710061;Xi’an institute for innovative earth environment research,Xi’an,710061;CAS Center for Excellence in Quaternary Science and Global Change,Xi’an,710061;Xi’an Center of Geological Survey(Northwest China Center of Geoscience),China Geological Survey,Xi’an,710054;Institute of Geology,China Earthquake Administration,Beijing,100029;University of Chinese Academy of Sciences,Beijing,100049)
出处
《地质论评》
CAS
CSCD
北大核心
2021年第5期1406-1440,共35页
Geological Review
基金
国家自然科学基金资助项目(编号:42102023)
黄土与第四纪地质国家重点实验室开放基金资助项目(编号:SKLLQGPY1804,SKLLQG2030)
第二次青藏高原科考项目(编号:2019QZKK0707)的成果。
关键词
青藏高原
新生代
古高度
构造隆升
年代学
Tibetan Plateau
Cenozoic
paleoelevation
tectonic uplift
chronology
