中国西部干旱区沙漠形成演化概述Ⅱ  

An outline of the formation and evolution of the deserts in west China Ⅱ

作　　者：郭峰[1] 王亲[1] 

机构地区：[1]兰州大学西部环境教育部重点实验室,甘肃兰州730000

出　　处：《佛山科学技术学院学报（自然科学版）》2013年第2期24-29,共6页Journal of Foshan University(Natural Science Edition)

摘　　要：探讨中国西部沙漠形成演化的驱动机制,其演化模式为"隆升-河湖-沙漠",其物源包括河流冲积物、冲积-湖积物、洪积-冲积物以及基岩的残积坡积物等。沙漠的形成与扩张可能受青藏高原隆升、北极冰盖的演化、特提斯洋消亡的共同影响,其与沙漠的形成和扩张之间的动力过程目前虽然不甚明了,但在时间上却有着较好的同步性,具体体现在8～7、5.3、3.6～3.4、2.5、0.8～0.6、0.15Ma这6个阶段。对亚洲内陆干旱化与青藏高原隆升、北极冰盖演化、特提斯消亡的时空耦合关系和动力机制建立了初步的概念模型。The Aeolian deposits and geomorphology evidences found in and around the deserts in west China show that the formation and evolution of Taklamakan, Gubantunggut, Kumtag, Badain Jaran and Mu Us desert/sand generally follow the patterns of ＂the uplift of mountains-rivers-deserts＂ and their sands mainly come from alluvial, alluvial-lacustrine, alluviao-puluvial sediments and residual bedrock. The expansion of these deserts is co-influenced by the uplift of Qinghai-Tibet plateau, the evolution of Arctic icecap and the disappearance of Tethys. Although the driving mechanism of their is still not clear by now, the periods of the formation and expansion of these deserts are found synchronous and are embodied with the following six phases： 8-7, 5.3, 3.6-3.4, 2.5, 0. 8-0. 6 and 0. 15 Ma, both of which offer a concept model for a further cognition of the time synchronization and the driving mechanism of the uplift of Qinghai-Tibet plateau, the formation of Arctic icecap and the disappearance of Tethys.

关 键 词：沙漠演化 青藏高原隆升 全球降温 

分 类 号：P941.73[天文地球—自然地理学]