南岭东部江西定南大湖湖沼沉积特征研究  

SEDIMENTARY CHARACTERISTICS OF DAHU LACUSTRINE-SWAMP AT DINGNAN,JIANGXI PROVINCE,EASTERN NANLING MOUNTAINS

作　　者：郑琰明[1] 钟巍[1] 薛积彬[1] 范小平[1] 甄治国[1] 刘伟[1] 马巧红[1] 蔡颖[1] 

机构地区：[1]华南师范大学地理科学学院,广东广州510631

出　　处：《华南师范大学学报（自然科学版）》2008年第2期129-135,共7页Journal of South China Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(40671189);广东省自然科学基金资助项目(06025042031522);教育部霍英东基金资助项目(91021)

摘　　要：在实地考察基础上,订正了前人关于江西定南大湖湖沼的地理坐标.最新钻孔岩芯显示,该地发育了多层泥炭、炭化淤泥与淤泥互层沉积,厚度可达9 m.年代测定表明,其埋深0.25-3.50 m的泥炭主要形成于末次冰消期-全新世;大于4 m的大湖泥炭沉积主要形成于末次间冰阶或深海氧同位素3阶段.钻孔总有机碳（TOC）、腐殖化度和干密度等气候代用指标的结果反映出泥炭发育阶段,气候相对干旱;而淤泥沉积阶段气候相对湿润.The outfield work in this article corrected the geographical coordinate of Dingnan Dahu in Jiangxi Province.The latest cores from Dahu lacustrine-swamp illustrates series of multi-layers of peat or carbonized silts（organic mud）,alternating with mud.The datings show that the layers of peat from 0.25 to 3.50 m were deposited during the last deglacial to Holocene,and the layers of peat above 4m were deposited during the mega-interstadial period or Marine Isotope Stage 3.The results of several climatic proxies such as TOC,humification and dry density indicate that the climate was relatively drier when the peat was deposited,while it was relatively more humid when the mud was formed.

关 键 词：南岭东部 大湖地区 湖沼沉积 气候变化 

分 类 号：P618.130.2[天文地球—矿床学] X131[天文地球—地质学]