SEDIMENTARY ENVIRONMENTAL EVOLUTION OF NINGSHAO PLAIN SINCE LAST GLACIAL MAXIMUM
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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45.3 m岩心柱,岩性以黏土、粉砂质为主。依据粒度、C/N、δ13CTOC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δ13CTOC的变化主要是受到大气CO2分压变化的控制。Abstract: 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.
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Key words:
- δ13CTOC /
- pollen /
- C/N ratio /
- Ningshao Plain /
- Hemudu site /
- LGM
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