江苏北部全新世海侵事件和气候变化

Holocene Marine Invasion Event and Climate Change in North Jiangsu

:江苏北部全新世古环境和古气候变化的研究 ,以建湖庆丰剖面最具代表性。以庆丰剖面已获研究成果为基础 ,结合邻区地层和古生物资料 ,探讨江苏北部全新世二次海侵事件和气候变化。所研究地区除建湖以外 ,尚有阜宁和淮安两地。结果表明 ,在 70 0 0aBP左右 ,建湖—阜宁一带发生全新世第一次海侵 ,此时该地区已处于潮间带位置。至 65 0 0aBP～ 4 5 0 0aBP最大海侵期 ,这一地区已位于潮间带下部或潮下带上部。同时 ,海水已向西入侵至淮安流均地区 ,当时此处已变为近岸沼泽地带。此时也正值全新世高温期 ( 80 0 0aBP～ 3 70 0aBP)的时段之内。最高年均气温高于今日 1 7℃。至 2 2 0 0aBP～ 10 0 0aBP期间 ,建湖地区又发生全新世第二次海侵 ,但其规律远小于第一次。

Qingfeng Profile in Jianhu is of typical significance in the study of Holocene paleoenvironment and paleoclimate changes in North Jiangsu.Twice marine invasion events and climate change in Holocene Epoch of North Jiangsu are discussed based on the obtained results of Qingfeng Profile and combined with the neighbouring stratigraphy and paleontological information.Beside Jianhu,the study area also includes the two places of Funing and Huaian.The results show that the first Holocene marine invasion happened along Jianhu Funing 7000aBP when it was located in intertidal zone.To the period of largest marine invasion during 6500aBP～4500aBP,the region along Jianhu and Funing was located in the lower part of intertidal zone or upper part of lower tidal zone.Meanwhile,the sea water invaded westward to the region of Liujun,Huaian when it had turned into inshore swampland and happened to be in the Holocene high temperature period ( 8 000 aBP～3700aBP)with a maximum annual average temperature 1 7 degree Celsius higher than that of nowdays.To the period of 2200aBP～1000aBP,the second Holocene marine invasion happened in the region of Jianhu,whose scale was smaller than the first one.