[关键词]
[摘要]
通过对宁波北仑 NBBL钻孔约6．5m 长柱状样中的有孔虫进行分析及定量统计，结合 AMS14 C 测年结果，恢复了宁波北仑中晚全新世古环境变化历史。研究结果显示，该区在全新世经历了一个完整的海进-海退演变过程。早中全新世(~7 300Cal aBP以前)，宁波北仑为陆地；自~7 300Cal aBP开始，海水开始影响北仑地区，该区域为滨岸沼泽相；~7 150—2 480Cal aBP演变为近岸浅海环境，此时段为海侵最盛期；~2 480Cal aBP以后，海水影响逐渐减弱；其后海水完全退出该地区，北仑地区变为陆地。
[Key word]
[Abstract]
Based on the quantitative analysis of foraminifera from Core NBBL and the AMS14 C dating,Holocene sedimentary environment change at Beilun,Ningbo was reconstructed. The result showed that a transgression-regression cycle occurred in this area during the middle and late Holocene.At7300 cal.aBP,the environment of Beilun was influenced by the marine setting.During 7150—2480 cal.aBP,the sediment was under a shallow marine facies.After2480 cal.aBP,the sea water became shallower,and finally retreated from this area.
[中图分类号]
[基金项目]
中国科学院战略性先导科技专项(XDA05120601，XDA11030104)；国家自然科学基金(41776073，41276044，41106035)；中国科学院战略性先导科技专项(B类)(Grant No．XDPB05)；现代古生物学和地层学重点实验室基金(Y026160413)联合资助
