相序、组构、沉积特征和物源区综合分析表明，横丹浊积岩系为弧前盆地充填物。
An integrated analysis of the facies sequence, fabrics, sedimentary characteristics and provenance indi-cates that the Hengdan turbidite sequence is turbidity sediments fillings.
撞击表明了前新生代盆地的结构，残余厚度和地下三分性。
Pre-Cenozoic basin structure, residual thickness and trichotomous property of basement are all shown by the impact.
沉积物被从两侧的弧前脊和岛弧冲到盆地，使该处地壳承重增加，形成洼地。
Sediments washed into the basin from both the fore-arc ridge and island arc weigh down the crust in this area, creating the depression.
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