湖泊科学2012，Vol.24Issue(3)：480-486,7.
湖北江汉平原JZ-2010剖面沉积物粒度特征与环境演变
Grain-size characteristics and sedimentary environment change of JZ-2010 section in Jianghan Plain, Hubei Province
摘要
Abstract
Based on the precise measurement and collection of AMS 14C dating ages combined with the analysis and research of environmental proxies such as grain-size, magnetic susceptibility from the lake sedimentary records of JZ-2010 section in the Jianghan Plain of Hubei Province, this paper reconstructs the sedimentary paleoenvironment of the study area during last 12.76 cal ka BP: 1) 12.76—6.70 cal ka BP. All the proxies show that sedimentary grain size gradually turned fine, which reflects a period of high water level and extended lake area. The regional environment turned from dry Late Glacial to fairly wet Early Holocene, characterized with transition and fluctuation. 2)6.70—4.47 cal ka BP. The regional environment is moist in the whole phase, which is the Holocene Optimum with optimal moist. The regional environment is the natural background of Daxi Culture transitioning to Qujial-ing Culture, moreover human settling into the heart area of Jianghan Plain. 3)4.47—3.67 cal ka BP. The regional environment is in dry conditions. Among this stage, all the proxies distinctively figured out the global 4.2 cal ka BP dry event in the Jianghan Plain. 4) 3.67 — 1.22 cal ka BP. Regional environment became wet again and hydrodynamic conditions obviously stronger around 2.5 cal ka BP which correspondence to the ancient Yunmeng Marsh expansion recorded in Pre-Qin historical documents. S ) Since 1.22 cal ka BP, lakes in Jianghan Plain have shrunk showing relatively dry environment conditions. These environmental changes ap- peared to be largely caused by anthropogenic factor and reached its peak during the Tang and Song Dynasty. Settlement development and agricultural activities such as reclaiming farmland has also been one of the important reasons reduced the lakes area of Jianghan Plain.关键词
江汉平原/湖泊沉积/沉积环境/粒度/磁化率Key words
Jianghan Plain/ lake sediment/ sedimentary environment/ grain-size/ magnetic susceptibility引用本文复制引用
王晓翠,朱诚,吴立,孙伟,李枫,周凤琴,齐士峥,龚琪岚..湖北江汉平原JZ-2010剖面沉积物粒度特征与环境演变[J].湖泊科学,2012,24(3):480-486,7.基金项目
国家自然科学基金项目(40971115,41171163)、国家教育部高等学校博士学科点专项科研基金项目(20090091110036)、教育部“985工程”专项南京大学研究生科研创新基金项目(2011CL11)、国家科技支撑计划项目(2010BAK67B02)和南京大学现代分析中心测试基金项目(0209001309)联合资助. （40971115,41171163）
