汤原断陷构造活动对沉积的控制

汤原断陷位于黑龙江省的北部,为依-舒地堑最北部的二级构造单元,为一新生代断陷盆地。研究表明,在汤原断陷构造活动的发展控制着沉积旋回的形成,表现为构造演化阶段的界限与沉积旋回的划分是一致的,整体上由一个正旋回和一个反旋回所组成;同时断裂活动的阶段性造成汤原断陷沉积物源区具有分割性的特点,随着断裂活动的减弱沉积物源逐渐趋于统一,同时盆底扇沉积主要形成于断裂活动的强烈时期,在稳定断陷期则表现为扇三角洲沉积。汤原断陷构造对沉积作用具有明显控制作用。

The control of tectonic activities on sedimentation in Tangyuan fault depression basin

Located in the north of Hei Longjiang province, Tan-gyuan fault depression basin is a secondary tectonic unit in the most northern part of Yi - shu graben and belongs to a Cenozoic fault depression basin. A study in the basin indicated the sedimentary cycle was under the control of tectonic activities. On one hand, the boundary of tectonic e-volution stages matched the classification of sedimentary cycles, making a positive cycle and a reverse cycle as a whole; on the other hand, the sedimentary area was cut apart because of the stages of faulting activities, and the weaker the faulting activities was, the more unified the sedimentation. At the same time, the sedimentation of basin floor fan was mainly formed in the strong stage of faulting activities. At stable faulted stage, however, it demonstrated as fan - delta sedimentation. In one word, the sedimentation in Tangyuan fault depression basin was obviously controlled by tectonic activities.