论文部分内容阅读
在初步获得渤海湾海河南部沿海低地第Ⅱ海相层年龄大于43.5ka BP的基础上,在沧州北部和海河北部的沿海低地又利用6个新的机械钻孔岩心,建立了2条垂直于现代岸线的长剖面。根据沉积物岩性和有孔虫查明了第Ⅱ海侵层在剖面中的空间分布,并获得一组新的AMS~(14)C年龄数据。结果显示,在第Ⅱ海相层中新获得的9个AMS~(14)C年龄同样均大于43.5ka BP。至此,渤海湾3条垂直现代岸线剖面10个钻孔的第Ⅱ海相层的21个AMS~(14)C年龄均大于43.5ka BP,进一步证实了普遍发育于渤海湾沿海低地的第Ⅱ海相层形成于MIS 3阶段早期或MIS 5阶段,而不是前人认为的23~39ka BP。
On the basis of preliminary finding that the second marine phase in the southern coastal area of the Haihe River in the Bohai Bay is older than 43.5ka BP, six new mechanical drilling cores are used in the northern coastal areas of Cangzhou and northern Haihe River to establish two vertically- Long section of the shoreline. According to sedimentary lithology and foraminifera, the spatial distribution of the second transgression layer in the profile was identified and a new set of AMS ~ (14) C age data was obtained. The results showed that the 9 AMS ~ (14) C ages newly acquired in the second marine layer were also all greater than 43.5ka BP. Up to now, the 21 AMS ~ (14) C ages of the Ⅱ sea facies layers of 10 boreholes in the three vertical modern shoreline sections of the Bohai Bay are all larger than 43.5ka BP, further confirming that the Ⅱ The marine facies was formed in the early stages of MIS 3 or MIS 5 rather than the 23 ~ 39 ka BP previously thought.