雷州半岛南部湖相沉积揭示的全新世早中期气候环境演变  

Early-Middle Holocene paleoenvironmental evolution revealed by a lacustrine sediment sequence in Leizhou Peninsula

作　　者：汤文坤 王永[1] 董进[1] 田飞[1] 刘瑾[1] 江南[1] TANG Wenkun;WANG Yong;DONG Jin;TIAN Fei;LIU Jin;JIANG Nan(Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China)

机构地区：[1]中国地质科学院地质研究所,北京100037

出　　处：《地质通报》2017年第9期1625-1634,共10页Geological Bulletin of China

基　　金：中国地质调查局项目<中国东部第四纪晚期地层序列与环境演变调查>(编号:121201102000150010-07)

摘　　要：对雷州半岛南部徐闻县九亩村一段1.54m厚的湖相沉积剖面进行粒度、磁化率、色度及有机碳氮分析,结合AMS^(14)C测年结果,重建了该地区10.5~6.5cal ka BP的气候环境变化。共分为3个阶段:(1)10.5~9.5cal ka BP,湖泊水体较浅,气候较干燥;(2)9.5~7.2cal ka BP,湖泊水位较高,环境稳定,气候较湿润;(3)7.2~6.5cal ka BP,湖水相对变浅,气候相对阶段(2)干燥。雷州半岛地区降水变化与印度季风演变模式一致,可与北半球夏季平均太阳辐射及其影响下热带辐合带(ITCZ)的移动进行对比,指标时间序列的红外噪声谱分析结果表明,存在千年—百年的准周期,反映了研究区气候环境变化对太阳活动的响应。This study presents the record of paleoenvironmental evolution results from a radiocarbon-dated1.54m-long lacustrine sediment sequence in south Leizhou Peninsula.Measurement of grain size,magnetic susceptibility(MS),total nitrogen(TN),total organic carbon(TOC),atomic TOC/TN(C/N)and color reflectance values was carried out in order to reconstruct the climate spanning the interval10.5~6.5cal ka BP.Three distinct stages can be identified as follows:①10.5~6.5cal ka BP,a shallow lake level and relatively dry climate dominated this area.②The interval from9.5~7.2cal ka BP was characterized by a relatively high lake level and humid climate.③During7.2~6.5cal ka BP,lake level was relatively shallow with a relatively dry climate.Indian monsoon was more responsible for precipitation variability in this area,which was interconnected with average monthly solar radiation in summer and ITCZ migration.Red noise spectrum analysis of proxies shows centennial to millennia time scale cycles,which suggests that the environmental evolution was probably sensitive to the secular solar activity.

关 键 词：雷州半岛 全新世早中期 环境变化 

分 类 号：P534.632[天文地球—第四纪地质学]