宁波北仑全新世有孔虫群落变化及古环境意义

Acta Palaeontologica Sinica(2018)

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Abstract
通过对宁波北仑NBBL钻孔约6.5 m长柱状样中的有孔虫进行分析及定量统计,结合AMS14C测年结果,恢复了宁波北仓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(~7 300 Cal aBP以前),宁波北仑为陆地;自~7 300 Cal aBP开始,海水开始影响北仑地区,该区域为滨岸沼泽相;~7 150-2 480 Cal aBP演变为近岸浅海环境,此时段为海侵最盛期;~2 480 Cal 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.
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Key words
Ningbo,transgression,regression,Beilun,Holocene,Foraminifera
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