资源描述:
《湖光岩玛珥湖表层沉积物粒度特征及其物源指示意义.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第37卷第3期广东海洋大学学报Vol.37No.32017年6月JournalofGuangdongOceanUniversityJun.2017李自超,蒲晓强,赵辉,等.湖光岩玛珥湖表层沉积物粒度特征及其物源指示意义[J].广东海洋大学学报,2017,37(3):93-99.湖光岩玛珥湖表层沉积物粒度特征及其物源指示意义1,21,21,2李自超,蒲晓强,赵辉,3111姜在兴,祁雅莉,黄鑫,侯庆华(1.广东海洋大学海洋与气象学院,广东湛江,524088;2.广东省近海海洋变化与灾害预警技术重点实验室,广东湛江524088;3.中国地质大学能源学院北京100083
2、)摘要:对湖光岩玛珥湖82个表层沉积物样品进行粒度分析,计算平均粒径、分选系数、偏度和峰度等参数。结果表明:湖光岩玛珥湖表层沉积物主要包括泥、粉砂、砂质粉砂和粉砂质砂4种类型。粉砂和泥在湖内分布范围最广,为主要沉积类型;砂质粉砂和粉砂质砂主要分布在近岸区域,分布范围较小。沉积物平均粒径(Φ值)变化范围2.1~7.5,平均值为6.8,粒度具有由岸向湖随水深增加而逐渐变细的趋势,但在部分近岸区域,由于雨水汇集入湖导致粒度参数变化剧烈。靠近湖岸和火山岩壁,沉积物颗粒最细的区域并未出现在湖水最深处。湖光岩玛珥湖的表层沉积物频率曲线表现为4个明显的组分峰值,尽管沉积物质主
3、要来源为四周火山岩风化产物,但是远距离搬运的细颗粒仍然对沉积物的粒度组分产生较大的影响。关键词:湖光岩玛珥湖;表层沉积物;粒度;物源;沉积环境+中图分类号:P736.212文献标志码:A文章编号:1673-9159(2017)03-0093-07doi:10.3969/j.issn.1673-9159.2017.03.014GrainSizeCharacteristicsoftheSurfaceSedimentsinHuguangyanMaarLakeandItsSignificancetoSedimentSourceAnalysis1,21,21,2LIZi-
4、chao,PUXiao-qiang,ZHAOHui,3111JIANGZai-xing,QIYa-li,HUANGXin,HOUQin-ghua(1.CollegeofOceanandMeteorology,GuangdongOceanUniversity,Zhanjiang524088,China;2.GuangdongProvinceKeyLaboratoryforCoastalOceanVariationandDisasterPrediction,GuangdongOceanUniversity,Zhanjiang,524088,China;3.Colle
5、geofEnergyResources,ChinaUniversityofGeosciences,Beijing100083,China)Abstract:82surfacesedimentsamplesareanalyzedandtheiraveragevaluesarecalculatedandsorting,skewnessandkurtosisareconducted.TheresultsshowthatHuguangyanMaarLakesurfacesedimentsaremainlycomposedoffourtypesofclastics,inc
6、ludingmud,silt,sandysiltandsiltysand.Amongthem,siltandmudtakeupthemajority,whicharethemainsedimenttype;sandysiltandsiltysandaredistributedclosetoinshoreregionandtakeupminority.Thesesamplesaveragegrainsizerangefrom2.1to7.5Φ,withanaveragevalueof6.8Φ.Generally,thegrainsizeofsedimentsamp
7、lesbecomesfinerwithincreasingofthewaterdepth.However,neartheinshoreregion,thegrainsizeparameterchangesdramaticallybecauseoftherainwashoftheshoreintothelake.Itappearsestuarinedeposittrend.Thedeepestoflake,whichisclosetothelakeshoreandvolcanicrockwall,isnottheplaceofthefinest收稿日期:2016-
8、11-14基金项目:广东