二连盆地白音查干凹陷构造沉降对沉积的控制作用

白音查干凹陷北部陡坡沉降速率大，南部缓坡沉降速率小，北坡的霍恩和冬屋地区是持续发育的沉积中心。变换构造带在白音查干凹陷主要表现为调节带，在凹陷的北坡桑合西地区、古尔地区是持续发育的横向调节带，地貌上为持续存在的古高地；南坡的白音查干调节带与达1井东调节带，分别是锡林好来与达尔其辫状河三角洲体系、达尔其与翁特沉积体系的分水岭。凹陷在阿尔善期至腾格尔期沉降快，为断陷湖盆；都红木期以后转化为坳陷湖盆。

CONTROL OF STRUCTURE ON THE SEDIMENTATION IN BAIYINCHAGAN DEPRESSION,ERLIAN BASIN

There is a larger subsidence rate on the steep slope in north Baiyinchagan depression than that on the ramp in the south.Huoen area and Dongwu area,both locate on the northern abrupt slope,are sustained depocenters.Converted tectonic belts in Baiyinchagan depression are all tectonic accommodation belts. The accommodation belt In Guer area and west Sanghe area, both lie on the northern slope of the depression,are transverse and sustained, and the topography here is ever-existing palaeohigh.Both Baiyinchagan accommodation belt and east Da-1 accommodation belt on the southern slope are watershed divides.The former is the watershed divide between the braid-river delta system of Xilinhaolai and Da''erqi and the latter between the sedimentary system of Da''erqi and Wengte.Baiyinchagan depression was a fault lake basin during Aershan stage and Tenggeer stage with rapid subsidence and converted into a downwraping lake basin after Duhongmu stage.