南京江北地区全新世环境演变的沉积学研究  

HOLOCENE CLIMATE VARIATION IN NORTH BANK OF THE YANGTZE RIVER, NANJING, INFERRED FROM ACCUMULATION RECORD FROM LINFENG PROFILE

作　　者：张强[1] 朱诚[1] 

机构地区：[1]南京大学城市与资源学系,江苏南京210093

出　　处：《安徽师范大学学报（自然科学版）》2000年第3期241-246,共6页Journal of Anhui Normal University(Natural Science)

基　　金：国家自然科学基金!( 4 97710 75 );高校博士点基金!( 942 842 4);南京大学测试基金资助项目

摘　　要：通过区域地貌调查及对南京浦镇林峰桥剖面沉积物进行粒度、地球化学和稳定碳同位素等环境替代指标的分析研究 ,结果表明 :本区在 140 0 0aBP左右先后经历了沼泽扩张期 ,此后气候变干 ,沼泽开始退缩 ,直至消失 ,在经过了长时间的沉积间断后又经历一次洪水泛滥期 .经过新仙女木期(10 2 0 0～ 10 80 0aBP)的寒冷期后进入了全新世的增温期 .后又经历多次冷暖波动 ,在 756 2± 90aBP～ 380 0aBP全新世最适宜期增温事件后 ,受 14～ 19世纪小冰期气候的影响 ,气候又开始向冷干转变 .同时在研究中还发现 ,古洪水多发生在气候转型期 ,因此笔者提出古洪水的发生可能与全球气候变迁历史中的突变事件有某种必然的联系 .Field investigation and analyses of the grain size, geochemical, stable carbon isotope etc climate proxies all indicate that this region, in about 14000aBP, underwent the expansion of the swamp. Subsequently, the swamp, because of aridity, began to decrease in area, and even disappeared. This process was followed by an immediate flooding period. The region, after the Younger Dryas cooling event (108000～10200aBP), came into the warming period of the Holocene, and then climate in the region fluctuated subsequently. The temperature this region, after the warming period in the Holocene (7562±90aBP～3800aBP), decreased under the influence of the Little Ice Age. The loess-like soil on the top of the profile, after study on the climate proxies, was wind-genesis during the main cooling period (3000～2850aBP) in the Holocene. The study result indicates that flood usually occurred in the climate transition period. Based on the result, the author believes that the appearance of flood may be in a certain relation with the abrupt climate event in the process of the global climate evolution.

关 键 词：全新世 古气候演变 沉积学特征 环境演变 南京市 

分 类 号：P531[天文地球—古生物学与地层学] P532[天文地球—地质学]