安徽巢湖湖相地层记录的早全新世气候事件  

EARLY HOLOCENE CLIMATIC EVENTS RECORDED IN LACUSTRINE SEDIMENTS IN THE CHAOHU REGION OF ANHUI PROVINCE

作　　者：胡飞[1] 杨玉璋[1] 张居中[1] 郑洪波[2] 

机构地区：[1]中国科学技术大学科技史与科技考古系,安徽合肥230026 [2]南京师范大学地理科学学院,江苏南京210046

出　　处：《地层学杂志》2015年第1期50-57,共8页Journal of Stratigraphy

基　　金：中国科学院战略先导科技专项"黄淮河地区旱-稻作农业起源与传播"项目(XDA05130503);国家自然科学基金项目(No.40772105)

摘　　要：通过对安徽巢湖西岸杭埠河入口三角洲地区CH孔岩芯湖泊相沉积物的色度、磁化率及地球化学等古环境代用指标的分析与研究，揭示了巢湖地区早全新世时期（11.7-7.5 cal. kaBP）的极端气候事件。研究表明：研究区11.7-7.5 cal. kaBP期间沉积环境极不稳定，气候波动明显，并分别约在7.8 cal. kaBP，8.6 cal. kaBP，9.4 cal. kaBP，10.5 cal. kaBP，11.4 cal. kaBP出现5次显著的冷干气候事件，且以8.6 cal. kaBP与11.4 cal. kaBP表现最为强烈，与我国冰芯、石笋及湖泊沉积物所记录的早全新世冷事件具有可比性，反映了巢湖湖泊沉积物对我国早全新世北半球中纬度地区的季风气候有明显的响应，这将为我国北半球早全新世气候波动的机理研究提供佐证。On the basis of AMS ^14C , color, magnetic susceptibility and geochemistry of lacustrine sedi- ments from the deltaic area in the estuaries where the Hangbu River enters in the Chaohu Lake, we recovered extreme climatic events during the early Holocene （11.7-7.5 cal. kaBP） in the Chaohu Region. The result shows that the sedimentary environment was extremely unstable with strong climate changes, including five dry-cold events at 7.8 cal. kaBP,8. 6 cal. kaBP,9.4 cal. kaBP,10. 5 cal. kaBP,and 11.4 cal. kaB, with the dry-cold events at 8.6 cal. kaBP and 11.4 cal. kaBP being stronger than the others. The climatic history is comparable with abrupt early Holocene climatic events record in ice cores, stalagmites, and lacustrine sediments elsewhere in China, suggesting that the climatic record preserved in lacustrine sediments in the Chaohu Region is a response the monsoonal climate in the mid-latitude regions of the northern hemisphere.

关 键 词：气候地层 色度 气候波动 冷干事件 早全新世 巢湖 安徽 

分 类 号：P534.63[天文地球—第四纪地质学] P539[天文地球—古生物学与地层学]