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根据东海陆架Zk23孔岩心分析资料,进行了沉积地层学、生物地层学和年代地层学分析,确定了该钻孔中段细砂层为埋藏古长江河口沙脊沉积,阐明了该孔附近海区冰消期前后和冰后期的沉积历史。约在15kaB.P.以前,海平面上升较快,沉积了下层的河口-水下三角洲相地层;约在15～12kaB.P.的冰消期期间,海平面波动并稳定于60～80m等深线附近,发育了沙脊地貌;约在12kaB.P.以来海平面再度快速上升,至7kaB.P.水位稳定,直至今日,沉积了沙脊上覆的浅海相粉砂质黏土和黏土质粉砂地层。
Sedimentary stratigraphy, bio-stratigraphy and age stratigraphy analysis were conducted based on the analysis of core data of Zk23 in the East China Sea Shelf, and the fine sand layer in the middle hole of the borehole was determined as the sand ridge sediment in the buried Changjiang River Estuary. Sedimentary history before and after the ice and the late ice. Before about 15kaB.P., the sea level rose rapidly and the lower estuary-subaqueous delta was deposited. Sea level fluctuated and remained stable at 60 ~ 80m, etc., during the ice elimination period of 15 ~ 12kaB.P. Near the deepest line, the sand ridge has been developed. The sea level rises rapidly again from about 12 kaB.P. to 7 kaB.P. The water level is stable. Until today, sediments of shallow marine silt clay and clay Silt formation.