废黄河三角洲典型钻孔XJ01全新世地层与微体古生物记录

钻孔XJ01位于废黄河三角洲滨淮镇附近，钻孔中上更新统顶部与全新统有4个14C测年数据控制，该孔全新统岩性特征自下而上为潮间带含贝壳砾质砂层、浅海相淤泥质黏土层、三角洲前缘相深灰色粉砂、三角洲平原相黏土质粉砂及粉砂质黏土。全新统微体古生物分析结果详细地反映了废黄河三角洲典型区域各时期的沉积环境，其中，全新统下部见大量的有孔虫与海相介形虫，中部微体古生物略少，上部地层中海相介形虫增多。整个全新世微体生物组合揭示了一个河口变化的水动力控制沉积环境。

Holocene stratum and microfossils from drill hole XJ01 in ancient Huanghe delta

The drill hole No. XJ01 is located on the shore of the ancient Huanghe delta, near Binhuai town in Jiangsu Province. There are four AMS-14C data from the top of Upper Pleistocene and the Holocene series. The Holocene lithology of the core XJ01 from bottom to top is littoral facies shelly gravelly sand, neritic facies muddy clay, delta front facies dark gray silt and delta plain facies clayey silt and silty clay. The Holocene microfossil paleontology analysis reflects the sedimentary environment of different periods in the typical area of the ancient Huanghe delta. Plenty of microfossils, including foraminifera and marine ostracods, have been discovered from the lower part of Holocene series. There are slightly fewer microfossils in the middle stratum, and an increase of marine ostracods in the upper stratum. The microfossil assemblages of the Holocene series reveal a changing sedimentary environment controlled by hydrodynamic conditions.