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The Division of Four Levels of Planation Surfaces and the Partition of Tectonic Geomorphology in West Junggar Mountain
详细信息   
摘要
By using spatial analysis,three dimensional surface analysis,profile shape analysis and the platform of Arc GIS based on SRTM3-DEM data,and combining with field geological survey,the geomorphologic structures of West Junggar Mountain between the western part of Karamay Basin and the eastern part of Tacheng Basin are studied;the planation surfaces are divided into four levels,and their structural geomorphologic features are discussed;and three subareas of structural geomorphology are divided.There are at least four levels of planation surfaces in the mountain,which appear on 2734-1760m,1520-1200m,1000-300mand 800-660mabove the sea level.Two planation surfaces,at over 1 760mabove the sea level(the levelⅠ)and at between 1520mand 1200mabove the sea level(the levelⅡ)respectively,were detected based on the inflection point obtained in three dimensional statistics for the ground surface(at 1320m/1270m above the sea level),and both undulations of them are of no more than 500-200m.The levelⅡ was shaped in the Cretaceous-Neogene Period,and the later period of denudation coincided with Changjihe Group shaped in the Neogene Period.There are two denudation planes under the inflection point.One of them exits in1000-660mand extends to 300mabove the sea level,and it is a deformed denudation plane existing at the foothill and the front of mountain(the levelⅢ),and it was shaped during the Middle Pleistocene to the Late Pleistocene and buried by the pluvial-alluvial deposits of the Late Pleistocene-Holocene Epoch.The other appears in 860-660mabove the sea level(the levelⅣ),it was shaped during the Late Pleistocene-Holocene Epoch as the pluvial-alluvial deposits of the Late Pleistocene Epoch have been whittled down.The above four level planations represent four stable periods and four rapid uplift periods among planations,but the deformation of levelⅢrecorded a response of the uplift of Qinghai-Tibet Plateau during the Late Quaternary Period.The structural geomorphologic difference in space provides some valuable information for the partition of regional tectonics,which composes one important factor for regional tectonic partition.The research of West Junggar Mountain shows that the direction of structural line lies as a whole on the direction of northeastsouthwest,which is different from the direction of northwest-southeast of Junggar Basin and Tacheng Basin and western part of it,and this makes a contrast between Zaire Mountain of the southern part controlled by several faults in the direction of northeast and the structural geomorphologic constitution of alternatingly distributed basins and mountains in Ur Kashi Mountain of the north part.Three structural geomorphologic subareas were divided according to the DEM ground surface features;they are northern subarea of the alternatingly distributed middle mountains and basins(Ⅰ-1),south subarea of middle-low mountains(Ⅰ-2),and south-eastern subarea of the mountain edges and the frontier plane of the mountain(Ⅱ).The West Junggar Mountain(Ⅰarea)belongs to a part of intense deformation zone of structure and seismic active zone of Tianshan-Junggar-Sayan-Baikal,although there has not been a violent earthquake in history,it possesses some basic conditions of seismic action in future,and it is close to the petro-gas development area in Karamay Basin, so essential seismic observation and seismic forecast is suggested.

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