青藏高原隆升的构造热演化机制

对“地球的第三极”青藏高原近代隆起成因的探讨,是地球科学中重要的地质命题之一,长期以来,中外地质学家对隆起的时代、幅度、速度、形式和过程,作了大量探讨和论述,并发表了一批隆起速率和起迄年代的数据。

MECHANISM OF THERMO-TECTONIC EVOLUTION OF THE UPLIFT OF THE QINGHAI-XIZANG PLATEAU

In this paper a genetic model summarization of the evolution mechanism of the uplift of the Qinghai-Xizang Plateau was made on the basis of a vast number of research achievements obtained using comprehensive palaeogeographie approach and geochrono-logical method on the magnitude, forms and history of the plateau uplift. An emphasis was put. on discussion of crustal thickening-lithospheric thinning-isostatic compensation-strike slip mass-sliding during crustal shortening, and mass-balance between uplift, erosion and deposition as two key lines in the investigation of the thermo-tectonie evolution of the plateau uplift. Ultimately, satisfactory approximate mathematical expressions for the uplift evolution process of the plateau was obtained by means of model calculation. Furthermore, in the light of some theoretical consideration of the alte-nating tectonic uplift and uplift due to isustatic adjustment, the whole process of the Qinghai-Xizang Plateau uplift was divided into three periods: slow uplifting period, wavy uplifting period and period of Quaternary rapid uplift.