摘要
西安翠华山风景地貌由古崩塌性滑坡体高速运动堆积而成 ,堆积体存在一些反映其运动和动力状况的沉积特征。将崩塌性滑坡体的平面堆积体划分出 5个平面相带 :中央相带、边缘相带、抛掷相带、气浪溅泥相带和特殊的残留相带 ,各带有不同的沉积特征 ,反映出高速运动中的崩塌式滑坡体动力过程和沉积过程在平面上分布的差异。通过研究该古堆积物的粒径变化、砾石组构和沉积结构、构造的差异 ,认为该崩塌式滑坡体在运动和沉积过程 ,存在前后部位动力过程的差异 :滑坡体从后部到前部 ,运动方向和方式发生了改变 ,粒径减小 ,混杂度增大 ,动力稳定性强度增大 ;后部以块体整体性滑动和振动的不完全解体动力为主 ,前部以块体碰撞大量分解动力为主 ;推测运动动力来源于崩塌性滑坡体的后部。作者根据其所处的地质、地貌和构造环境 ,结合沉积特征所反映的运动和动力学特性 。
The tourist landscape in Xi'an Cuihua Mountain, is generated from a large paleo-avalanchine landslide, with the special deposit structures showing indirectly information of high speed block movement. In the article, the author divided five plane phases in the rock avalanchine landslide deposit: the center phase, the boundary phase, the projectile phase, the airblast and mud splatter phase, and some remnant phase. Every phase has the special deposit characteristics that showing the differences in plane distributions, when the avalanchine landslide was moving and depositing. Based on studying on the changes in grain size, gravel fabrication, and deposit structures, we discovered that there are some dynamical differences between in the front of deposit and in rear of deposit of the avalanchine landslide: from the rear to the front, the moving direction and mode had changed. The grain size was getting decreased; intermixing degree and dynamical stability increased. In the rear of deposit, the blocks integrally slid and were little detached. But in the front, they collided and detached in great lot. We deduced that the power came from the rear of the landslide Study on the geological and geomorphologic environment, on characteristics of the deposit that may reflect the trail of movement and dynamics, we discussed the generative process of this landslide.
出处
《山地学报》
CSCD
2000年第6期502-507,共6页
Mountain Research
关键词
古崩塌性滑坡
平面相带
沉积特征
形成过程
paleo-avalanchine landslide
plane phases
deposit characteristics
generative process
Xi′an
