摘要
敦煌盆地位于甘肃省西部石板山和阿尔金山、鹰咀山之间,由疏勒河、党河和榆林河搬运堆积而成。盆地被中间山体相隔又可分为北部敦煌盆地,南部阿克塞盆地和玉门—踏实盆地。地理座标为东径92°15′—97°30′;北纬39°20′—41°05′,面积约40000km^2(见图3)。 盆地处于天山—阴山东西向复杂构造带的南缘与祁吕贺兰山字型构造西翼反射弧外缘的交接复合部位,因而主体构造均呈东西向及北东东向。敦煌盆地是受上述二大构造体系,特别是西翼反射弧的相互干扰改造下形成的断陷盆地。
This paper pursues the tentative approach to the stractigraphical division of Quaternary period, The neotectonic movement and the hydrogeo-logical condition of Dun-Huang basin in the western Gansu . By means of the bore detection and the anaslyis determination, the strata of the flu-violacustrine facies is granted the nomenclature . The sediments of Holo-cene Epoch-pleistocence Epoch are represented respectively by Huang Dun-zi Formation Yii Men guan Formation, Ma Mijuan Formation and Dun Huang Formation.Because the Dun Huang basin is situated at the position of the Complex tectonic zone in the direction of East-west and the western reflex of are of Qilian Shan, Luliang Shan and Helan Shan E type structural system. The neotectonic movement is very violent and is interrupted and remoulded each other . It has been pointed out that the basin has the characteristics of Neotectonic movement namely the in harititance, uplift, new born, boundery and oscillation.Dun Huang basin has the Characteristic of "facies belt" that is situated along the pediment of the typical arid area, The ground water stems mainly from the river water oozing, By means of the outflow of unit drawdown depth, The enriched water division may be pursued, If can ronghly reflect the enreuriiched regulation of ground water .
出处
《甘肃地质》
1989年第10期39-55,共17页
Gansu Geology
