新仙女木事件在苏北盆地得胜湖沉积物中的记录  

Evidence from the Lacustrine Sediments of Desheng Lake,Subei Basin for the Younger Dryas Event

作　　者：张丽蓉[1] 舒强[1] 陈晔[1] 金爱春[1] 何玉春[1] 

机构地区：[1]南京师范大学地理科学学院,南京210046

出　　处：《地质科技情报》2011年第1期42-46,共5页Geological Science and Technology Information

基　　金：国家自然科学基金项目(40501075;40471135;40671193)

摘　　要：通过对苏北盆地得胜湖(DS)钻孔沉积岩心的研究,进一步证实新仙女木事件具有全球性的特征。根据对苏北盆地DS钻孔湖泊沉积物质量磁化率、粒度以及地球化学元素的分析,在DS钻孔下部584～512cm深度处,发现这一深度时段内质量磁化率突然降低,中值粒径保持较低水平,Sr的质量分数降低至最小值,w(Rb)/w(Sr)比值快速增大到峰值,各代用指标均一致揭示了12826～11 492CalaB.P.间非常明显的低温干旱期,其降温幅度大,变化迅速。同时,结合已有研究颜家庄(YZ)浅钻分析得出,这次冷事件在时间以及变化特征上与南京葫芦洞以及格陵兰GISP2冰芯记录的末次冰消期中的新仙女木事件相对应,指示苏北地区的气候环境演化过程与全球气候环境的变化具有一致性。According to the composite analysis in the DS core in Subei Basin,thi s paper is further confirmed that the Younger Dryas event has the global charact eristics.The synthetic analysis of the mass susceptibility,grain size and geoc hemistry elements from the lacustrine sediments of DS core obtained from Subei B asin have shown that the medium diameter is the minimum during the 584-512 cm of the core.Besides,the mass susceptibility dropped suddenly,and the content of Sr also reduced even to minimum,while the value of Rb/Sr increases quickly and reached the peak.These indexes revealed a low-temperature period which has an apparent drop in temperature in 12 826—11 492 Cal aB.P..Meanwhile,the existed research of YZ core also found this phenomenon.This incident corresponds with Younger Dryas event which occurred in the last interglacial time.This revealed a strong correlation with Huludong′s stalagmite oxygen isotope record in Nanjin g and the GISP2 oxygen isotope record in Greenland.All this has proved that You nger Dryas event event should have experienced the global climate changes.

关 键 词：苏北盆地 质量磁化率 粒度 地球化学元素 新仙女木事件 

分 类 号：P512.2[天文地球—地质学]