It has been long held that the buried soil under sand dunes on the major sand lands in northern China formed due to the climatic changes of the Holocene, which could be used as a proxy record to reconstruct the past climate in warm-humid periods.
本文对我国东北沙地沙丘埋藏土壤的形成原因重新进行了探讨。
The sand ridges on Stratum U14 which is bellow seafloor 90 m are buried sand ridges,and belong to TST(transgressive systems tract) of 320~200 ka BP,and the upper bounding surfaces of the sand ridge units are therefore considered as the MFS(maximum flooding surface) of this transgressive.
基于高分辨率的单道地震和多波束测深数据,识别并对比了东海陆架中部同一海区相距20余万年的层U14和层U2两期沙脊群,其中层U14期沙脊属于埋藏沙脊,位于东海海底以下90 m深处,推测属于距今320~200 ka的海侵体系域(TST),沙脊顶界面是该期海侵的最大洪泛面(MFS);层U2期沙脊位于东海陆架,属于衰退沙脊,系末次盛冰期(LGM)以来的TST,顶界面是LGM以来的MFS。
