中国东部海域表层沉积物磁化率空间分布特征
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摘要
海洋沉积物的磁性参数是反映物质来源、沉积环境变化的重要代用指标。本文基于中国东部海域的176个沉积物样品,通过粒度、磁化率的测试分析,揭示了磁化率和粒度的空间分布特征,并探讨了磁化率和粒度之间的关系及其环境指示意义。研究表明,三大海域磁化率(χ)存在显著差异,东海磁化率最高,渤海次之,黄海最低,即χdonghai>χbohai>χhuanghai,磁化率在河口、沿岸偏高,并呈现出向外海方向缓慢递减的趋势,这反映了三大海域的物源差异以及在不同水动力条件下的物源供给、扩散和运移。磁性参数与粒度的相关性研究表明,多重因子的综合作用使得χfd%作为整个海域沉积物的粒度代用指标并不理想。磁性参数的变化与沉积动力密切相关,水动力越强、水介质扰动性越大,磁性参数越离散。
Magnetic parameters of marine sediment is an important substitute index of material source and sedimentary environment changes.This study is based on the 176 surface sediment samples of the East China Seas:by particle size test and magnetic susceptibility analysis,it reveals the spatial distribution characteristics of magnetic susceptibility and grain size,and also discusses the relationship between the magnetic susceptibility,grain size and its environmental significance.Research shows that:There are significant differences of magnetic parameters in three Marine,χdonghai>χbohai>χhuanghai,the east seas high magnetic susceptibility value areas majorly distribute estuaries and coast,and present a slowly decreasing trend toward the sea,reflecting the differences of material source,supply,proliferation and migration under different hydrodynamic conditions in three waters.The correlation of frequency magnetic susceptibility and grain size shows that the combination of multiple factors make theχfd% as the sea shelf sediment grain size parameters is not ideal.the variation of the magnetic parameters of the shelf sediments is closely related to the sedimentary dynamics,the stronger the hydrodynamic is,the stronger the disturbance of the water medium is,the greater the change of the magnetic susceptibility,the more discrete the magnetic parameters.
Magnetic parameters of marine sediment is an important substitute index of material source and sedimentary environment changes.This study is based on the 176 surface sediment samples of the East China Seas:by particle size test and magnetic susceptibility analysis,it reveals the spatial distribution characteristics of magnetic susceptibility and grain size,and also discusses the relationship between the magnetic susceptibility,grain size and its environmental significance.Research shows that:There are significant differences of magnetic parameters in three Marine,χdonghai>χbohai>χhuanghai,the east seas high magnetic susceptibility value areas majorly distribute estuaries and coast,and present a slowly decreasing trend toward the sea,reflecting the differences of material source,supply,proliferation and migration under different hydrodynamic conditions in three waters.The correlation of frequency magnetic susceptibility and grain size shows that the combination of multiple factors make theχfd% as the sea shelf sediment grain size parameters is not ideal.the variation of the magnetic parameters of the shelf sediments is closely related to the sedimentary dynamics,the stronger the hydrodynamic is,the stronger the disturbance of the water medium is,the greater the change of the magnetic susceptibility,the more discrete the magnetic parameters.
引文
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[2]闫慧,吴国玺,李京忠,等.许昌市路尘磁化率空间分布特征及其污染指示意义[J].热带地理,2013,33(2):219-223.YAN Hui,Wu Guoxi,LI Jingzhong,et al.Spatial distribution of road dust magnetic susceptibility of XuChang and its pollutional implications[J].Tropical Geography,2013,33(2):219-223.
[3]胡守云,邓成龙,E.Appe,等.湖泊沉积物磁学性质的环境意义[J].科学通报,2001,46(17):1491-1494.Hu Shouyun,Deng Chenglong,E.Appel,et al.Environmental significance of magnetic properties of lake sediments[J].Science Bulletin,2001,46(17):1491-1494.
[4]张振克,吴瑞金,王苏民.岱海湖泊沉积物频率磁化率对历史时期环境变化的反映[J].地理研究,1998,17(3):297-302.Zhang Zhenke,Wu Ruijin,Wang Sumin.Implication of magnetic frequency dependent susceptibility on environmental variation from lacustrine sediment in DaiHai Lake[J].Geographical Research,1998,17(3):297-302.
[5]王永红,沈焕庭,张卫国.长江与黄河河口沉积物磁性特征对比的初步研究[J].沉积学报,2004,22(4):658-663.Wang Yonghong,Shen Huan-ting,Zhang Weiguo.A Preliminary comparison of magneties of sediments from the Changjiang and the Huanghe Estuaries[J].Acta Sedmentologica Sinica,2004,22(4):658-663.
[6]刘健,秦华峰,孔祥淮,等.黄东海陆架及朝鲜海峡泥质沉积物的磁学特征比较研究[J].第四纪研究,2007,27(6):1031-1039.Liu Jian,Qin Huafeng,Kong Xianghuai,et al.Comparative researcheson the magnetic properties of muddy sediments from the Yellow Sea and East China Sea shelves and the Korea strait[J].Quaternary Sciences,2007,27(6):1031-1039.
[7]Niu J L,Yang Z S,Li YH,et al.The characteristics of the environmental magnetism in sediment from the river mouths of the Changjiang River and the Huanghe River and their comparison study[J].Marine Sciences,2008,32(4):24-30.
[8]Yang L J.Distribution characteristics of magnetic susceptibility of surficial sediments in the Western Taiwan Strait[J].Acta Sedimentologica Sinica,2009,27(4):668-703.
[9]王双,王永红.黄渤海表层沉积物环境磁学特征分类及物源诊断[J].第四纪研究,2016,35(1):216-226.Wang Shuang,Wang Yonghong.Magnetic properties and provenance of surface sediments in the BoHai and Yellow Seas[J].Quaternary Sciences,2016,35(1):216-226.
[10]潘大东,王张华,陈艇,等.长江口表层沉积物矿物磁性分区特征及其沉积环境指示意义[J].海洋学报,2015,37(5):101-111.Pan Dadong,Wang Zhanghua,Chen Ting,et al.Mineral magnetic characteristics of surficial sediments and their implications for identifying sedimentatry environments at the Changjiang River mouth[J].Haiyang Xuebao,2015,37(5):101-111.
[11]Liu J,Chen Z,Chen M,et al.Magnetic susceptibility variations and provenance of surface sediments in the South China Sea[J].Sedimentary Geology,2010,230(1-2):77-85.
[12]田成静,欧阳婷萍,朱照宇,等.海南岛周边海域表层沉积物磁化率空间分布特征及其物源指示意义[J].热带地理,2013,33(6):666-673.Tian Chengjing,Ouyang Tingping,Zhu Zhaoyu,et al.Spatial distribution of magnetic susceptibility and its provenance implication of surface sediments in the sea areas around the Hainan island[J].Tropical Geography,2013,33(6):666-673.
[13]汪卫国,戴霜,陈莉莉,等.白令海和西北冰洋表层沉积物磁化率特征初步研究[J].海洋学报,2014,36(9):121-131.Wang Weiguo,Dai shuang,Chen Lili,et al.Magnetic susceptibility characteristics of surface sediments in Bering Sea and western Arctic Ocean:preliminary results[J].Acta Oceanalogica Sinica,2014,36(9):121-131.
[14]GE S L,SHI X F,HAN Y B.Distribution characteristics of magnetic susceptibility of the surface sediments in the southern Yellow Sea[J].Chinese Science Bulletin,2003,48(s1):37-41.
[15]周鑫,刘毅,程文翰,等.黄东海陆架区表层沉积物磁化率空间分布及其影响因素分析[J].地球环境学报,2011(2):356-361.Zhou Xin,LiuYi,Cheng Wenhan,et al.Spatial distribution of magnetic susceptibility of the surface sediments on theYellow Sea and the East China Sea continental shelf[J].Journal of Earth Environment,2011(2):356-361.
[16]Xu B,Bianchi T S,Allison M A,et al.Using multi-radiotracer techniques to better understand sedimentary dynamics of reworked muds in the Changjiang River estuary and inner shelf of East China Sea[J].Marine Geology,2015,370(2):76-86.
[17]Jia J,Zheng H,Yang S.Rock types in Yangtze drainage and their implications for zircon U-Pb provenance study of Yangtze Sediments[J].Journal of Tongji University,2010,38(9):1375-1380.
[18]郭玉贵,李延成,许东禹,等.黄东海大陆架及邻域大地构造演化史[J].海洋地质与第四纪地质,1997,17(1):1-12.Guo Yugui,Li Yangcheng,Xu Dongyu,et al.Tectonic evolution of Yellow sea,East China sea and continental shelf and adjacent areas[J].Marine Geology&Quaternary Geology,1997,17(1):1-12.
[19]秦蕴珊,廖先贵.渤海湾海底沉积作用的初步探讨[J].海洋与湖沼,1962,4(z2):1999-2007.Qin Yunshan,Liao Xiangui.A preliminary study on the marine sediments in Bohai Bay[J].Oceanologia et Limnologia Sinica,1962,4(z2):1999-2007.
[20]乔淑卿,石学法,王国庆,等.渤海底质沉积物粒度特征及输运趋势探讨[J].海洋学报,2010,32(4):139-147.Qiao Shuqing,Shi Xuefa,Wang guoqing,et al.Discussion on grain-size characteriastics of seafloor sediment and transport pattern in the Bohai Sea[J].Acta Oceanologica Sinica,2010,32(4):139-147.
[21]王厚杰,杨作升,毕乃双.黄河口泥沙输运三维数值模拟Ⅰ——黄河口切变锋[J].泥沙研究,2006,4(2):1-9.Wang Houjie,Yang Zuosheng,Bi Naishuang.3-D simulation of the suspended sediment transport in the Yellow River mouth I:Shear front off the Yellow River mouth[J].Journal of Sediment Research,2006,4(2):1-9.
[22]史文静.黄河口悬浮泥沙扩散规律及其数值模拟研究[D].青岛:中国海洋大学,2008.Shi Wenjing.3DNumerical Simulation and Analysis of the Transportation of Suspendedsediment in the Huanghe Estuary[D].Qingdao:Ocean University of China,2008.
[23]Yang B.Study of the influence of sediment loads discharged from Huanghe River on sedimentation in the Bohai and Yellow seas[J].Meteorological Hydrological&Marine Instrument,1998,34(3):757.
[24]李凤业,高抒,贾建军,等.黄、渤海泥质沉积区现代沉积速率[J].海洋与湖沼,2002,33(4):364-369.Li Fengye,Gao Shu,Jia Jianjun,et al.Contemporary deposition rates of fine-grained sediment in the Bohai and Yellow seas[J].Oceanologia et Limnologia Sinica,2002,33(4):364-369.
[25]李军,胡邦琦,窦衍光,等.中国东部海域泥质沉积区现代沉积速率及其物源控制效应初探[J].地质论评,2012(4):745-756.Li Jun,Hu Bangqi,Dou Yanguang,et al.Modern sedimentation rate,budget and supply of the muddy deposits in the East China seas[J].Geological Review,2012(4):745-756.
[26]Wang Y J,Liu M H,Wu S Y,et al.The paleosol layers in the late quaternary sediment of the Huanghai sea shelf[J].Acta Oceanologica Sinica,1987(S2):190-202.
[27]石学法,申顺喜,Yi Hi-il,等.南黄海现代沉积环境及动力沉积体系[J].科学通报,2001(S1):1-6.Shi Xuefa,Shen Shunxi,Yi Hi-il,et al.Modern sedimentary environment and dynamic sedimentary system in the Southern Yellow Sea[J].Chinese Science Bulletin,2001(S1):1-6.
[28]赵一阳,李凤业,秦朝阳,等.试论南黄海中部泥的物源及成因[J].地球化学,1991,6(2):112-117.Zhao Yiyang,Li Fengye,Qin Zhaoyang,et al.Source and genesis of mud in the central part of the south Yellow sea in special reference to geochemical data[J].Geochimica,1991,6(2):112-117.
[29]许东禹.东海陆架泥质沉积作用[J].海洋地质与第四纪地质,1985,5(2):18-26.Xu Dongyu.Mud sedimentation on the east China sea continental shelf[J].Marine Geology&Quaternary Geology,1985,5(2):18-26.
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