差异抬升:青藏高原新生代古高度变化历史

发布时间：2018-12-26 11:06

【摘要】：青藏高原地表抬升历史是新生代以来众多地质事件和气候环境事件的边界条件.高原古高度变化历史将地球深部动力学、地表过程和气候变化等不同圈层的相互作用有机地联系在一起.各种古高度计的发展和在青藏高原的广泛应用推动了对高原隆升历史的进一步认识:早始新世时青藏高原主体由南部的冈底斯山(~4500m)和北部的羌塘中央山脉(~5000m)及夹于其间的低海拔盆地(~2500m)组成,而南部的喜马拉雅山仍处于接近海平面的位置,北部的可可西里盆地海拔高度也不超过1500m.具有"世界屋脊"之称的青藏高原直到中新世以后才基本形成.尽管如此,青藏高原各块体的隆升历史仍然不清,进而制约对整个青藏高原抬升历史的重建.只有尽可能运用不同的古高度计对同一地区进行研究,获得更多的不同地区精确的古高度历史,才能从整体上认识青藏高原的抬升和扩展的形式和过程.
[Abstract]:The history of surface uplift of the Qinghai-Tibet Plateau is the boundary condition of many geological events and climatic and environmental events since the Cenozoic. The history of paleoheight changes in the plateau organically links the interactions among the deep earth dynamics, surface processes and climate change in different circles. The development of various ancient altimeters and their wide application in the Qinghai-Xizang Plateau have promoted a further understanding of the uplift history of the plateau: in the early Eocene, the main body of the Qinghai-Tibet Plateau consisted of the Gangdis Mountains in the south (~ 4500m) and the central Qiangtang Mountains in the north ( ~ 5000m) and the low-altitude basin (~ 2500m) sandwiched in it, The Himalayas in the south are still close to sea level, and the Kokoxili basin in the north is no more than 1500 m above sea level. The Qinghai-Tibet Plateau, known as the roof of the world, was not formed until after the Miocene. Nevertheless, the uplift history of various blocks of the Qinghai-Xizang Plateau is still unclear, thus restricting the reconstruction of the uplift history of the whole Qinghai-Xizang Plateau. Only by using different ancient altimeters to study the same area as far as possible and obtaining more accurate paleoheight history in different regions can the form and process of uplift and expansion of Qinghai-Xizang Plateau be understood as a whole.
【作者单位】：中国科学院青藏高原研究所大陆碰撞与高原隆升重点实验室;中国科学院青藏高原地球科学卓越创新中心;中国科学院大学资源与环境学院;
【基金】：国家自然科学基金项目(批准号:41472207,41490615) 中国科学院战略性先导科技专项项目(B类)(编号:XDB03010401)资助
【分类号】：P534.6;P542

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