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地质论评  2005 

南京江北地区9490~4840aBP环境演变的地层记录研究

Keywords: 南京市BP粒度地球化学元素沉积速率沉积物环境演变地层记录

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Abstract:

来自^14C、δ^13C、粒度和地球化学元素的分析表明,南京江北地区在5120aBP、6240aBP、4840aBP和8914aBP是气候相对暖湿期,而8523aBP和6520aBP可能对应的是相对干冷的气候。该区在9490~4840aBP期间沉积速率具有明显不均一性,9490~8730aBP期间沉积速率为56mm/100a,8695~8566aBP期间为62mm/100a,而8523~4840aBP期间沉积速率仅为8mm/100a,上述现象可能与9490~8566aBP期间该区经历过海侵和地壳沉降加快有关。由于在第5~7层中未发现海相有孔虫,可以肯定该区海拔高于7m的地带在9490~4840aBP期间未受海侵影响。

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