| 南京长江全新世河流阶地的年代及其意义 |
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| 引用本文： | 雷生学,陈杰,刘进峰,尹金辉,侯康明,王昌盛.南京长江全新世河流阶地的年代及其意义[J].地震地质,2011,33(2):391-401. |
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| 作者姓名： | 雷生学 陈杰 刘进峰 尹金辉 侯康明 王昌盛 |
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| 作者单位： | 中国地震局地质研究所地震动力学国家重点实验室;天津市地震局;江苏省地震局; |
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| 基金项目： | 地震行业科研专项(200808015); 中国地震局地质研究所基本科研业务专项(DF-IGCEA060821)共同资助 |
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| 摘 要： | 河流阶地作为古气候和古环境的重要载体,在研究古气候、古环境变化方面有着极其重要的作用.文中对南京市长江南岸全新世河流阶地的23m厚钻孔沉积物,采用细颗粒石英单测片再生法技术进行了系统的光释光(OSL)测年,并对沉积物中的植物碎片等进行了<‘14>C测年,样品的OSL年龄和经树轮校正后的<‘14>C年龄吻合.测年结果表明...
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| 关 键 词： | 长江阶地 光释光测年 单测片再生法 14C测年 古气候 |
| 收稿时间： | 2011-04-11 |
| 修稿时间： | 2011-05-17 |
THE AGES AND IMPLICATION OF YANGTZE RIVER HOLOCENE TERRACE |
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| LEI Sheng-xue,CHEN Jie,LIU Jin-feng,YIN Jin-hui,HOU Kang-ming,WANG Chang-sheng.THE AGES AND IMPLICATION OF YANGTZE RIVER HOLOCENE TERRACE[J].Seismology and Geology,2011,33(2):391-401. |
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| Authors: | LEI Sheng-xue CHEN Jie LIU Jin-feng YIN Jin-hui HOU Kang-ming WANG Chang-sheng |
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| Institution: | LEI Sheng-xue1,2) CHEN Jie1) LIU Jin-feng1) YIN Jin-hui1) HOU Kang-ming3) WANG Chang-sheng1)1)State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China2)Earthquake Administration of Tianjin,Tianjin 300201,China3)Earthquake Administration of Jiangsu Province,Nanjing 210014,China |
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| Abstract: | The fluvial terrace has plenty of paleoclimate and paleoenviromental information which play an important role in paleoclimate and paleoenviromental researches.In this paper,we drilled a 42.85m-long core(N06S2)in 2007,which was located in the south bank of Yangtze River at Shifuqiao in Qixia district of Nanjing City.Firstly,fine quartz grains(4～11μm)were extracted from bulk samples in dark room,and the quartz purity tests were conducted.The results show that purity can satisfy the experiment.All measurements were performed on an automated Daybreak 2200 TL/OSL system with blue(470±5nm)light stimulation and U-340 luminescence detection filters.Thick source alpha counting(TSAC)was used to measure the uranium and thorium concentrations.The potassium content was determined using flame spectrophotometer.Secondly,the preheat plateau test and dose recovery test were performed on one sample using the SAR protocol.The results indicate that the fast component dominates the OSL signals.In preheat plateau test,identical De in the thermal treat from 160～260℃ was observed,thus we use the preheat temperature of 220℃ for 10 seconds.The recuperation ratios of zero point are below 2%and the recycling ratios lie between 0.9 and 1.1.In dose recovery test,OSL signal sensitivity changes are well corrected.Tests of luminescence characteristics confirm the suitability of the material for OSL dating.At last,samples from this drilling core were systematically dated by optically stimulated luminescence(OSL)dating method,and samples which contain organic matters were dated by AMS{14C}.The results show that the De values from the two methods accord with each other very well.However,OSL dating results show that there is a hiatus in this core,and the hiatus,which ranges from 1.9ka to 7.9ka,may be the result of change of Yangtze River’s channel or the erosion of the river.The ages of the fluvial deposition mainly range from 0.26ka to 1.9ka and 7.9ka to 9.1ka,it could be attributed to the results of paleoclimate and sea levels change.Meanwhile,study results on pollen and spores show that the paleoclimate has changed from warm wet to temperate wet during the stage of hiatus. |
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| Keywords: | Yangtze River terrace OSL dating SAR {14C} dating paleoclimate |
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