宁绍平原末次冰盛期以来的沉积环境演化  

SEDIMENTARY ENVIRONMENTAL EVOLUTION OF NINGSHAO PLAIN SINCE LAST GLACIAL MAXIMUM

作　　者：刘锐[1,2,3] 覃军干[4] 

机构地区：[1]南京大学地球科学与工程学院,南京210093 [2]国土资源部海洋油气资源与环境地质重点实验室,青岛266071 [3]青岛海洋地质研究所,青岛266071 [4]中国海洋石油总公司湛江分公司,湛江524000

出　　处：《海洋地质与第四纪地质》2013年第3期37-46,共10页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金青年项目(41206051)

摘　　要：河姆渡钻孔(29°59.064′N、121°21.754′E)取自杭州湾南岸宁绍平原的河姆渡古文明遗址附近,获得45.3m岩心柱,岩性以黏土、粉砂质为主。依据粒度、C/N、δ13 CTOC的实验数据分析,对比孢粉指标结果,揭示了宁绍平原末次冰盛期以来的沉积环境演化及阶段性古气候变化;指示了本孔沉积物有机质来源主要为内源水生植物,且δ13 CTOC的变化主要是受到大气CO2分压变化的控制。The HMD Core（29°59.064′N、121°21.754′E） was collected near the Hemudu Civilization site at Ningshao Plain,the southern bank of Hangzhou Bay.The core is 45.3 m long with clay and silt as its main lithological components.The results of grain size,C/N ratio,organic carbon isotope（δ13CTOC） value and pollen analysis reveal the sedimentary environmental changes and paleoclimatic evolution stages in Ningshao Plain since LGM.It also shows that,the main organic source of HMD Core was from endogenous water plants,and the δ13CTOC values variation was mainly controlled by the change in atmospheric CO2 pressure.It is a good response to global climatic changes.

关 键 词：有机碳同位素 孢粉 C N 宁绍平原 河姆渡遗址 末次冰盛期 

分 类 号：P736.2[天文地球—海洋地质]