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《Acta Geologica Gansu》 1987-00
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A TENTATIVE DISCUSSION ON NEW TECTONIC MOVEMENTS IN HEXICORRIDOR GANSU

Cai Houwei (Geomechanic Regional Surveying Team, Bureau of Geology and Mineral Resources of Gansu)  
The new tectonic movements in Hesi-corridor displayed the large uplift of mountain and associated with the strong submergence of basin, such as Upper Tertiary and Quaternary pleistocene series molasse Formation of piedmont acumulation, and its sedimentary thickness up to 2000m, that eroded river valley and its down-cutting depth range up to 200 m. there are two-three grades Planation surfaces of new or old diluvial fan's dis- placement and duplication with development, and the formation of multiple grade's river valley terrace as well as continual appearance's unconfor-mable surface in this area since the Late Tertiary. All of these, have been proved the facts, that characters of new tectonic action mainly is continual and intermittent gradient elevation and subsidence movements, in the same time, there is still associated with crustal horizontal movements of different degree, such as Upper Tertiary System and Quaternary System have been formed folds with reversed thrustfault etc.The producing cause of strong new tectonics, that according to plate principle, may be stated as: presently, the Eurasia plate and Indian plate in collision, but the Indian plate mainly is now northeasternly compressing,owing to compressing actions of Indian plate, so that Qinhai Xizang plateau is now greatest elevating, that comes to pass into global lofty crest,no doubt which play an important role in actions of new tectonics of Hesi corridor area.
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