【摘要】 详细研究了七段、约130km长的近垂直反射地震剖面所揭示的松辽盆地下的壳幔结构。松辽盆地之下壳幔之间为相对厚的Moho过渡带。可分为薄Moho和透镜状Moho以及过渡型Moho,与之对应的壳幔结构也有差异。松辽盆地的发育阶段明显地可分为断陷期、拗陷期以及夭折期,不同的壳幔结构可能与松辽盆地不同的发育期存在密切联系。此外,通过对比,认为裂谷盆地区具有类似的特殊壳幔结构。在裂谷区,壳幔之间强烈相互作用,不同的地壳组成和裂谷形成的不同阶段是形成不同壳幔结构的主要原因,而且它们之间具有成因上的联系,并与裂谷的形成阶段相一致。更多还原

【Abstract】 This paper studies on the crust-mantle structures(CMSs) of Songliao basin(SB) revealed by seven segment and about 130km long near-vertical reflection profiles. It suggests that CMSs below SB show thick transition zones. There are three types of Moho, i. e. thin Moho, lenticular Moho, and transitional one between them. And their CMSs also are quite different. SB’s evolution can be divided into three stages, faulted depression, down-warping depression and shrinking stage. The different CMS is probably correspond to the different stage of SB’s formatiom respectively. In addition, as compared with the lower crustal structures in the rift areas, there are similar specific CMSs. In the rift area, there is strong interaction between crust and mantle. The crustal composition and different rift-developed stage are major factors which result in different CMSs, and it exists genetic relationship among CMSs and is consistent with the rift-developed stages.更多还原