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地质论评  2010 

重力驱动作用――滦平盆地下白垩统西瓜园组沉积时期主要的搬运机制

Keywords: 滦平盆地,下白垩统,重力驱动作用,滑动,滑塌,砂质碎屑流,搬运机制,河北省

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Abstract:

通过对冀北滦平盆地下白垩统西瓜园组沉积地层的实地考察,发现盆地内发育丰富的重力驱动作用沉积物。文中描述西瓜园组发育的滑动和滑塌现象,指出露头剖面中存在的挤压变形现象并非构造成因,而是由于滑动块体和滑塌块体前端的挤压应力环境造成的。在介绍西瓜园组重力流沉积发育环境的基础上,对露头中存在的若干重力流沉积进行了描述,并使用砂质碎屑流这一概念对这些现象进行了较为合理的成因解释。通过对滑动和滑塌(重力块体运动)和砂质碎屑流―浊流(重力流)沉积物研究,结合前人对该地区冲积扇―扇三角洲的研究成果,认为重力驱动作用是滦平盆地下白垩统西瓜园组沉积时期主要的搬运机制。

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