四川汉源大树剖面沉积物年代与粒度特征初步研究
摘要
汉源大树剖面厚11.2m,光释光测年结果显示其地质时代为中更新世晚期-晚更新世中期.频率曲线有两峰a型、三峰b型和带粗尾巴的三峰c型三种类型,具有1-2Φ、3-4Φ、4-5Φ、5-6.5Φ、6.5-8Φ、10-11Φ等6个众数,各众数在地层纵向各层段上变化趋势明显;具有a型频率曲线特征的沉积物反映湖水较深,而其余的则可能指示了水体较浅的滨浅湖相.粒度组成以粉砂为主,分选性较好,中值粒径平均为18.12μm.粘土与细粉砂、粉砂含量曲线呈正相关关系;中值粒径与砂、粗粉砂含量曲线也呈正相关关系,并与粘土含量曲线呈负相关关系.大树剖面粒度组成可分为八个沉积阶段,构成从细到粗的三个沉积旋回,各沉积阶段分别指示了不同的水动力条件.
The results of OSL dating of five lacusteine deposit samples from one 11.2m thick profile,Dashu Village in Hanyuan County,show that they have been deposited since the Mid-Pleistocene to Late-Pleistocene.There were three types in the frequency curve of sedimentology,including a-type with two peaks,b-type with three peaks and c-type with three peaks and a thick tail,showing six modes of 1-2Φ、3-4Φ、4-5Φ、5-6.5Φ、6.5-8Φ、10-11Φ respectively in each layers,and presented significant trends in the mode changes.The a-type reflected characteristics of deep water sediments,and the rest two types indicated a shallow water in the offshore lake.The suspended sediments are mainly composed of better sorting silt with the median of 18.12μm.Significantly positive correlations are between clay and fine silt,silt.The median size is positive correlated with sand,but negative correlation with clay.The profile from the bottom upwards can be divided into eight sedimentary stages,constituting three depositional cycles from fine to coarse grains and suggesting the different hydrodynamic conditions.
The results of OSL dating of five lacusteine deposit samples from one 11.2m thick profile,Dashu Village in Hanyuan County,show that they have been deposited since the Mid-Pleistocene to Late-Pleistocene.There were three types in the frequency curve of sedimentology,including a-type with two peaks,b-type with three peaks and c-type with three peaks and a thick tail,showing six modes of 1-2Φ、3-4Φ、4-5Φ、5-6.5Φ、6.5-8Φ、10-11Φ respectively in each layers,and presented significant trends in the mode changes.The a-type reflected characteristics of deep water sediments,and the rest two types indicated a shallow water in the offshore lake.The suspended sediments are mainly composed of better sorting silt with the median of 18.12μm.Significantly positive correlations are between clay and fine silt,silt.The median size is positive correlated with sand,but negative correlation with clay.The profile from the bottom upwards can be divided into eight sedimentary stages,constituting three depositional cycles from fine to coarse grains and suggesting the different hydrodynamic conditions.
引文
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[10]王君波,朱立平.不同前处理对湖泊沉积物粒度测量结果的影响带.湖泊科学,2005,17(1):17-23.
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[13]张平,宋春晖,杨用彪等.稳定湖相沉积物和风成黄土粒度判别函数的建立及其意义.沉积学报,2008,26(3):501-507.
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[15]沈吉,汪勇,羊向东等.湖泊沉积记录的区域风沙特征及湖泊演化历史:以陕北红碱淖湖泊为例.科学通报,2006,51(1):87-92.
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[23]孙东怀,安芷生,苏瑞侠等.古环境中沉积物粒度组分分离的数学方法及其应用.自然科学进展,2001,11(3):269-276.
[24]乔彦松,郭正堂,郝青振等.中新世黄土-古土壤序列的粒度特征及其对成因的指示意义.中国科学(D辑),2006,36(7):646-653.
[25]万世明,李安春,Jan-Berend W Stuut等.南海北部ODP1146站粒度揭示的近20Ma以来东亚季风演化.中国科学(D辑),2007,37(6):761-770.
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[27]Weltje GJ.End-member modeling of compositional data:numeri-calstatistical algorithms for solving the explicit mixing problem.JMath Geol,1997,29:503-549.
[28]Prins MA,Weltje GJ.End-member modeling of siliciclastic grain-size distributions:the Late Quaternary record of eolian and fluvial sediment supply to the Arabian Sea and its paleoclimatic significance.In:Harbaugh J,Watney L,Rankey Get aleds.Numerical Experiments in Stratigraphy:Recent Advances in Stratigraphic and Sedimentologic Computer Simula-tions.SEPMSpecial Publication.Soc Sed Geol,1999,62:91-111.
[29]赵志中,王书兵,乔彦松等.青藏高原东缘晚新生代地质与环境.北京:地质出版社,2009:203-209.
[30]Friedman GM.Dynamic processes and statistical parameters compared for size frequency distribution of beach and river sands.Journal ofSedimentary Petrology,1967,37(2):327-354.
[31]Dieglas DJ.Grain-size indices,classification and environment.Journal ofSedimentary Petrology,1968,38(10):83-100.
[32]Pasarga R.Grain size representation by CMpattern as a geological tool.Journal ofSedimentaryPetrology,1964,34:830-847.
[33]Meyers PA.Organic geochemical proxies of paleoceanographic,paleolimnologic,and paleoclimatic processes.Organic Ge-ochemical,1997,27(5-6):213-250.
[34]Wang Hongya,Liu Hongyan,Cui Haiting.Terminal Pleistocene/Holocene palaeoenvironmental changes revealed by min-eralmagnetism measurments of lake sediments for Dali Nor area,Southeastern Inner Mongolia Plateau.Palaeogeography Palaeoclimatoloy Palaeoecoloy,2001,170(1-2):115-132.
[35]Shuman B,Bravo J,Kaye J.Late Quaternary water-level variations and vegetation history at Massachusetts.Quaternary Research,2001,56(3):401-410.
[36]刘东生.黄土与环境.北京:科学出版社,1985:1-400.
[37]国家海洋局.海洋调查范围(第四分册———海洋地质调查).北京:海洋出版社,1975:9-88.
[2]沈吉.湖泊沉积研究的历史进展与展望.湖泊科学,2009,21(3):307-313.
[3]刘岫峰.沉积岩粒度分析及应用.成都地质学院沉积岩研究室,1981:21-23.
[4]任明达,王乃梁.现代沉积环境概论.北京:科学出版社,1985.
[5]肖晨曦,李志忠.粒度分析及其在沉积学中应用研究.新疆师范大学学报(自然科学版),2006,25(3):118-123.
[6]彭彦嘉.岱海岩芯沉积的粒度组成与湖区全新世降水变化历史[学位论文].北京:中国科学院研究生院,2005.
[7]侯新花,吴艳宏,杨丽原.全新世镜泊湖粒度特征记录的该地区古降水变化历史.湖泊科学,2006,18(6):605-614.
[8]丁喜桂,叶思源,高宗军.粒度分析理论技术进展及其应用.世界地质,2005,4(2):203-207.
[9]王君波,鞠建延,朱立平.两种激光粒度仪测量湖泊沉积物粒度结果的对比.湖泊科学,2007,19(5):509-515.
[10]王君波,朱立平.不同前处理对湖泊沉积物粒度测量结果的影响带.湖泊科学,2005,17(1):17-23.
[11]陈敬安,万国江,张峰等.不同时间尺度下的湖泊沉积物环境记录———以沉积物粒度为例.中国科学(D辑),2003,33(6):563-568.
[12]殷志强,秦小光,吴金水等.湖泊沉积物粒度多组分特征及其成因机制研究.第四纪研究,2008,28(2):345-353.
[13]张平,宋春晖,杨用彪等.稳定湖相沉积物和风成黄土粒度判别函数的建立及其意义.沉积学报,2008,26(3):501-507.
[14]沈吉,刘兴起,Matsumoto R等.晚冰期以来青海湖沉积物多指标高分辨率的古气候演化.中国科学(D辑),2004,34(6):582-589.
[15]沈吉,汪勇,羊向东等.湖泊沉积记录的区域风沙特征及湖泊演化历史:以陕北红碱淖湖泊为例.科学通报,2006,51(1):87-92.
[16]肖海丰,沈吉,肖霞云.云南鹤庆钻孔揭示的古生产力轨道尺度演化.湖泊科学,2006,18(6):615-620.
[17]孙千里,周杰,肖举乐.岱海沉积物粒度特征及其古环境意义.海洋地质与第四纪地质,2001,21(1):93-95.
[18]隆浩,王乃昂,李育等.毛乌素沙地北缘泊江海子剖面粒度特征及环境意义.中国沙漠,2007,27(2):138-142.
[19]刘兴起,王苏民,沈吉.青海湖QH-2000钻孔沉积物粒度组成的古气候古环境意义.湖泊科学,2003,15(2):112-117.
[20]Peng YJ,Xiao JL,Nakamura Tet al.Holocene East Asian monsoonal precipitation pattern revealed by grain-size distribu-tion of core sediments of Daihai Lake in Inner Mongolia of north-central China.Earth and PlanetaryScience Letters,2005,233:467-479.
[21]Xiao JL,Chang ZG,Si Bet al.Partitioning of the grain-size components of Dali Lake core sediments:evidence for lake-level changes during the Holocene.Journal ofPaleolimnology,2009,42:249-260.
[22]殷志强,秦小光,吴金水等.中国北方部分地区黄土、沙漠沙、湖泊、河流细粒沉积物粒度多组分分布特征研究.沉积学报,2009,27(2):343-351.
[23]孙东怀,安芷生,苏瑞侠等.古环境中沉积物粒度组分分离的数学方法及其应用.自然科学进展,2001,11(3):269-276.
[24]乔彦松,郭正堂,郝青振等.中新世黄土-古土壤序列的粒度特征及其对成因的指示意义.中国科学(D辑),2006,36(7):646-653.
[25]万世明,李安春,Jan-Berend W Stuut等.南海北部ODP1146站粒度揭示的近20Ma以来东亚季风演化.中国科学(D辑),2007,37(6):761-770.
[26]Boulay S,Colin C,Trentesaux Aet al.Mineralogy and sedimentology of Pleistocene sediment in the South China Sea(ODP Site1144).In:Prell WL,Wang P,Blum Pet aleds.Proc ODP,Sci Res,2003,184:1-21.
[27]Weltje GJ.End-member modeling of compositional data:numeri-calstatistical algorithms for solving the explicit mixing problem.JMath Geol,1997,29:503-549.
[28]Prins MA,Weltje GJ.End-member modeling of siliciclastic grain-size distributions:the Late Quaternary record of eolian and fluvial sediment supply to the Arabian Sea and its paleoclimatic significance.In:Harbaugh J,Watney L,Rankey Get aleds.Numerical Experiments in Stratigraphy:Recent Advances in Stratigraphic and Sedimentologic Computer Simula-tions.SEPMSpecial Publication.Soc Sed Geol,1999,62:91-111.
[29]赵志中,王书兵,乔彦松等.青藏高原东缘晚新生代地质与环境.北京:地质出版社,2009:203-209.
[30]Friedman GM.Dynamic processes and statistical parameters compared for size frequency distribution of beach and river sands.Journal ofSedimentary Petrology,1967,37(2):327-354.
[31]Dieglas DJ.Grain-size indices,classification and environment.Journal ofSedimentary Petrology,1968,38(10):83-100.
[32]Pasarga R.Grain size representation by CMpattern as a geological tool.Journal ofSedimentaryPetrology,1964,34:830-847.
[33]Meyers PA.Organic geochemical proxies of paleoceanographic,paleolimnologic,and paleoclimatic processes.Organic Ge-ochemical,1997,27(5-6):213-250.
[34]Wang Hongya,Liu Hongyan,Cui Haiting.Terminal Pleistocene/Holocene palaeoenvironmental changes revealed by min-eralmagnetism measurments of lake sediments for Dali Nor area,Southeastern Inner Mongolia Plateau.Palaeogeography Palaeoclimatoloy Palaeoecoloy,2001,170(1-2):115-132.
[35]Shuman B,Bravo J,Kaye J.Late Quaternary water-level variations and vegetation history at Massachusetts.Quaternary Research,2001,56(3):401-410.
[36]刘东生.黄土与环境.北京:科学出版社,1985:1-400.
[37]国家海洋局.海洋调查范围(第四分册———海洋地质调查).北京:海洋出版社,1975:9-88.
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