河北阳原盆地南缘第四纪晚期活动断裂的确定及其意义——纪念黄汲清教授诞辰100周年

DETERMINATION OF LATE QUATERNARY FAULT AT THE SOUTH EDGE OF YANGYUAN BASIN,HEBEI PROVINCE,AND ITS SIGNIFICANCE:100 ANNIVERSARY BIRTHDAY OF LATE PROFESSOR HUANG JIQING

河北阳原盆地南缘 ,恒山余脉山前 ,发育较多的洪湖积台地。台地海拔 990～ 12 0 0m ,高出桑干河河床约14 5～ 35 5m ,呈NE -SW向不连续带状展布。台地前缘陡坎明显 ,台地下部由侏罗纪或元古宙地层组成 ,上部发育第四纪泥河湾组湖相层 ,据TL或OSL测定 ,其年龄在 2 14～ 99kaB .P .之间。断裂位于台地前缘基岩与盆地南缘第四纪沉积层之间 ,断裂延伸约 2 0km以上 ;断裂下盘基岩一侧有清楚的断层三角面和断层擦痕等 ,断层走向NE4 5°左右 ,倾向NW ,属正断层 ;断裂始于侏罗纪末 ,但第四纪仍有强烈活动 ,是控制着阳原盆地的形成和演化的主要断裂之一。另外 ,沿断裂带两侧发现有多处古人类活动遗迹。在纪念黄汲清教授诞辰 10 0周年之际 ,今特撰写此文 ,以表达对他深切怀念和敬意 !

A series of lade tarraces developed at the south margin of Yangyuan basin of Hebei Province, which located at the piedmont of the north-east part of Henshan Mountain. The elevation of tarrace ranges from 990 to 1 200 meter about 145 to 355 meter higher than the water level of Sangan River. The tarraces strenched from north-east to south-west. The front scarp can be clearly seen. Quaternary lake sediment with ages from 214kaB.P. to 99kaB.P. ( TL or OSL dating), developed on the Jurassic or Proterzoic bedrock. The fault, stretching about 20km, with strike NE45° and dip NW, is situated in the place between the bed rock and Quaternary sediments. Fault deltidial surface and scratch can be seen at the bare bed rock of bottom wall. The fault belongs to ordinary fault of Late Quaternary. In addition, the remains of ancient human are found at the fault zone. According to regional data, the formation and evolution of Yangyuan basin are controlled by this fault. This paper is to express our deep respects and memories for Late Professor Huang Jiqing at his 100 anniversary birthday.