南流江三角洲沉积特征及其环境演变

Sedimentary Characteristic of the Nanliu River Delta and Its Environmental Evolution

南流江三角洲钻孔记录揭示，三角洲全新世沉积陆上部分有三角洲平原相、三角洲前缘相、前三角洲—浅海相、河床相依次迭覆的特征，水下部分有三角洲前缘相、前三角洲─—浅海相、河床相依次迭覆的特征。该三角洲大体经历了全新世早期─—海侵阶段、全新世中期─—稳定阶段和全新世中晚期─—海退阶段。南流江主河道自明代初（距今约６００年）开始，从东部周江逐渐向西部变迁至七星岛附近入海。

According to the drilling logs from Nanliu river delta, Holocene deposit in the delta is characteristic of facies delta plain, delta front, pre-delta neritic and riverbed in regular order in the land part, and facies delta front, pre-delta neritic and riverbed in the subaqueous part. The delta has roughly gone throughthree stages of transgression──early Holocene, stabilzation──mid Holocene and regression-──mid-later Holpcene. Since the early Ming Dynasty (about 600 years ago), the principal river course of Nanliu river has moved from Zhou river (estern)to about Qixing island (western) and flows into sea.