山东烟台地区芝罘剖面粒度分维特征及其环境意义  

Fractal Characteristics of Grain Size from Zhifu Section in Yantai Area of Shandong, China and Their Environmental Significance

作　　者：黎武标 李志文[1,2] 王志刚 李子康[1] LI Wu-biao;LI Zhi-wen;WANG Zhi-gang;LI Zi-kang(School of Earth Sciences,East China University of Technology,Nanchang 330013,Jiangxi,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,Jiangxi,China)

机构地区：[1]东华理工大学地球科学学院,江西南昌330013 [2]东华理工大学核资源与环境国家重点实验室,江西南昌330013

出　　处：《地球科学与环境学报》2019年第5期592-603,共12页Journal of Earth Sciences and Environment

基　　金：国家自然科学基金项目(41201006,41571007);核资源与环境省部共建国家重点实验室培育基地(东华理工大学)开放基金项目(NRE1507)

摘　　要：山东半岛北部存在一系列黄土-古土壤沉积序列。在野外调查的基础上,通过对山东烟台地区芝罘岛黄土状沉积物粒度和分维值特征的分析,结合光释光测年,探讨了山东半岛北部晚更新世气候环境演变。结果表明:芝罘剖面末次冰期—末次间冰期(62.85~124.90 ka B.P.)主要由砂黄土、黄土和古土壤叠覆堆积组成;芝罘剖面沉积物具有良好的分形结构,可以清楚区分黄土与古土壤,分维值从大到小分别为古土壤(2.379)、黄土(2.194)、砂黄土-黄土(2.157);分维值与标准偏差成显著的正相关关系,相关系数为0.889 4,与平均粒径有较好的正相关性,与峰态和偏度相关性较低;芝罘剖面沉积物分维值在垂向上呈现出峰谷交替的3个旋回,可以替代粒度参数指示沉积环境,分维值低反映气候干冷,冬季风强盛,黄土堆积速率加快,反之则气候暖湿,古土壤发育。The sedimentary sequences superimposed by loess and paleosol are widely distributed in the northern of Shandong peninsula.Based on the field investigation and photoluminescence dating,the grain size and the characteristics of fractal dimension of loess sediments from Zhifu island in Yantai area of Shandong were calculated by graphical method and power exponential function method,and Late Pleistocene climate environment and evolution in the northern of Shandong peninsula were studied.The results show that the formation age of Zhifu section is 62.85-124.90 ka B.P.,corresponding to last glacial-last interglacial periods,and is composed of sandy loess,loess and paleosol;the sediment from Zhifu section has a good fractal structure,which can clearly distinguish the paleosol(the fractal dimension is 2.379),loess(2.194),and sandy loess-loess(2.157);the fractal dimension has a significant positive correlation with the standard deviation,the correlation coefficient is 0.889 4;it has a high positive correlation with the average grain size and a low correlation with the kurtosis and skewness;the fractal dimension of sediment from Zhifu section show remarkable variations in alternation of peaks and valleys vertically,which can be used as an indicator of sedimentary environment;the low fractal dimension reflects the dry and cold climate,and the winter wind is strong and loess accumulation accelerates,on the contrary,the climate is warm and humid,and the paleosol is developed.

关 键 词：粒度 分维值 黄土 古土壤 末次间冰期 末次冰期 气候变化 山东 

分 类 号：P588.23[天文地球—岩石学] P512.2[天文地球—地质学]