MODE OF ELEMENT OCCURRENCE IN SURFACE SEDIMENTS FROM EAST PACIFIC RISE NEAR 13°N AND THE EQUATOR
-
摘要: 为了解海底热液活动对沉积物元素赋存状态的影响,对东太平洋海隆(EPR)13°N和赤道附近表层沉积物样品17A-EPR-TVG1、17A-EPR-TVG5做了全样及顺序提取分析,探讨了Al、Ca、Fe、Mn、Ti、Ba、Zn、Cu、Sr、V、Mo、U及稀土元素赋存状态。XRD结果显示,17A-EPR-TVG1沉积物的主要矿物形态为黄铁矿,17A-EPR-TVG5沉积物样品主要矿物为方解石。受热液影响明显的17A-EPR-TVG1沉积物中,除Ca、Sr外,其余元素主要赋存于铁锰氧化物与残留相中。正常深海沉积物17A-EPR-TVG5中,除Al、Ba、Ti外,其余元素主要赋存于碳酸盐相及铁锰氧化物相中。稀土元素的顺序提取结果显示,17A-EPR-TVG1沉积物4个相态稀土元素北美页岩配分曲线中均有Eu正异常,17A-EPR-TVG5沉积物4个相态稀土元素北美页岩配分曲线中均出现Ce负异常,分别指示了二者形成过程中热液与海水的加入。Abstract: In order to assess the influence of seafloor hydrothermal activity on element occurrence in sediments, we carried out sequential extraction procedures and whole-rock analysis for the surface sediments(17A-EPR-TVG1, 17A-EPR-TVG5) collected from East Pacific Rise near 13°N and the equator, and discussed mode of element occurrence of Al,Ca,Fe,Mn,Ti,Ba,Zn,Cu,Sr,V,Mo,U and rare earth elements (REE).XRD results indicate that the primary mineral phase of 17A-EPR-TVG1 is pyrite and 17A-EPR-TVG5 sample has calcite as its main mineral. Elements except Ca and Sr of 17A-EPR-TVG1 which were greatly affected by hydrothermal activity mainly occur in the residual phase and ferromanganese oxide phase. However, elements except Al,Ba and Ti of 17A-EPR-TVG5 which is characteristic of normal deep ocean sediment mainly concentrate in carbonate phase and ferromanganese oxide phase. The sequential extraction results indicate that, the shale-normalized REE distribution pattern of the REEs in the sediments exhibits a positive Eu anomaly in all the four phases of 17A-EPR-TVG1,while the negative Ce anomaly occurs in the four phases of 17A-EPR-TVG5. We come to the conclusion that the sea water and hydrothermal fluid participated in the formation of the sediments.
-
-
[1] Bostrom K,Peterson M N A,Joensuu O,et al.Aluminum-poor ferromanganese sediments on active oceanic ridges[J].Journal of Geophysical Research,1969,74:3261-3270.
[2] Evgeny G.Metalliferous Sediments of the World-Fundamental Theory of Deep-Sea Hydrothermal Sedimentation[M].Berlin, Springer.2006.
[3] Nadine L B,Pierre M S,Jean C C.Contrasted sulphide chemistries in the environment of 13°N EPR vent fauna[C]//Deep Sea Research Part I:Oceanographic Research Papers,2003,50(6):737-747.
[4] Fouquet Y,Knott R,Cambon P,et al.Formation of large sulfide mineral deposits along fast spreading ridges:Example from off-axial deposits at 12°43'N on the East Pacific Rise[J].Earth and Planetary Science Letters,1996,144(1-2):147-162.
[5] Khripounoff,Alberic P.Settling of particles in a hydrothermal vent field(East Pacific Rise 13°N)measured with sediment traps[C]//Deep Sea Research Part A.Oceanographic Research Papers,1991,38(6):729-744.
[6] Francis.Resistivity measurements of an ocean floor sulphide mineral deposit from the submersible cyana[J].Marine Geophysicl Researches,1985,7:419-438.
[7] Hekinian R,Fevier M,Avedik F,et al.East Pacific Rise near 13°N:1983a, geology of new hydrothermal field[J].Science,1983,219:1321-1324.
[8] Cherkashev G A.Metalliferous sediments from areas of ocean sulfide ore formation (on an example of the northern part of the East Pacific Rise)[J]. VNⅡOkeangeologiya, Leningrad,1990:138-152.
[9] 薛发玉.东太平洋海隆热液活动区沉积岩心的地球化学研究[D].中国海洋大学硕士学位论文,2003.[XUE Fayu.Geochemical study of the sediments from two cores in the hydrothermal field on the East Pacific Rise[D].2003.]
[10] 袁春伟.东太平洋海隆13°N附近沉积物元素地球化学研究[D].中国科学院研究生院硕士学位论文,2007.[YUAN Chunwei.Element geochemical study of the sediments from 13°N East Pacific Rise hydrothermal field[D].2007.
]
[11] 弗斯特纳U,维特曼G T M.水环境的金属污染[M].北京:海洋出版社,1988:31-204.[Fêstner U,Wittmann G T W.Metal Pollution in the Aquatic Environment[M].Translated by WANG Zhongyu,YAO Chonghua.Beijing:China Ocean Press,1988
:31-204.]
[12] Tessier A,Campbell P G C,Bisson M.Sequential extraction procedure for the speciation of particulate trace metals[J].Analytical Chemistry Acta,1979,51(7):844-851.
[13] Dunk R M,Mills R A.The impact of oxic alteration on plume-derived transition metals in ridge flank sediments from the East Pacific Rise[J].Marine Geology,2006,229:133-157.
[14] Bayon G,German C R,Boella R M,et al.An improved method for extracting marine sediment fractions and its application to Sr and Nd isotopic analysis[J].Chemcial Geology,2002,187:179-199.
[15] 赵伦山,张本仁.地球化学[M].北京:地质出版社,1987:41-43.[ZHAO Lunshan,ZHANG Benren.Geochemistry[M].Beijing:Geological Publishing House,1987:41
-43.]
[16] Murray R W,Leinen M.Scavenged excess aluminum and its relationship to bulk titumium in biogenic sediment from the central equatorial Pacific Ocean[J].Geochimica et Cosmochimica Acta,1996,60(20):3869-3878.
[17] 韦刚健,刘颖,李献华,等.南海沉积物中过剩铝问题的探讨[J].矿物岩石地球化学通报,2003,22(1):23-25.
[WEI Gangjian,LIU Ying,LI Xianhua,et al.Excess Al in the sediments from South China Sea[J].Bulletin of Mineralogy,Petrology and Geochemistry,2003,22(1):23-25.]
[18] Toshitaka G,Hitoshi C,Toshiro Y,et al. Chemical characteristics of newly discovered black smoker fluids and associated hydrothermal plumes at the Rodeiguez Triple Junction, Central Indian Ridge[J].Earth and Planetary Science Letters,2001,193:371-379.
[19] 韩吟文,马振东.地球化学[M].北京:地质出版社,2003:36-37.[HAN Yinwen,MA Zhendong.Geochemistry[M].Beijing:Geological Publishing House,2003:36
-37.]
[20] 袁春伟,曾志刚,殷学博,等.东太平洋海隆13°N附近沉积物岩心地球化学特征[J].海洋地质与第四纪地质,2007,27(4):45-53.
[YUAN Chunwei, ZENG Zhigang,YIN Xuebo,et al.Sediment geochemistry from 13°N East Pacific Rise hydrothermal field[J].Marine Geology and Quaternary Geology,2007,27(4):45-53.]
[21] 刘英俊,曹励明.元素地球化学[M].北京:科学出版社,1984.[LIU Yingjun,CAO Liming.Element Geochemistry[M].Beijing:Science Press,1984.]
[22] Tobias S,Jennifer M.Oxyanions in metalliferous sediments:Tracers for paleoseawater metal concentrations[J].Geochimica et Cosmochimica Acta,2000,63(13):2243-2254.
[23] John H T,Simone M.Role of hydrothermal precipitates in the geochemical cycling of vanadium[J].Nature,1989,342:531-533.
[24] 赵一阳,鄢明才.中国浅海沉积物地球化学[M].北京:科学出版社,1994:130-131.[ZHAO Yiyang,YAN Mingcai.Geochemistry of Sediments of the China Shelf Sea[M].Beijing:Science Press,1994:130
-131]
[25] 丁振举,刘丛强,姚书振,等.海底热液沉积物稀土元素组成极其意义[J].地质科技情报,2000,19(1):27-35.
[DING Zhenju,LIU Congqiang,YAO Shuzhen,et al.REE composition and implication of hydrothermal sedimentation of sea-floor[J].Geological Science and Technology Information,2003,19(1):27-35.]
[26] 王中刚,于学元,赵振华,等.稀土元素地球化学[M].北京:科学出版社,1989.[WANG Zhonggang,YU Xueyuan,ZHAO Zhenhua,et al.Rare Earth Elements Geochemistry[M].Beijing:Science Press,1989.]
[27] 徐兆凯,李安春,徐方建,等.东菲律宾海表层沉积物中元素的赋存状态[J].海洋地质与第四纪地质,2007,27(2):51-58.
[XU Zhaokai,LI Anchun,XU Fangjian,et al.Elemental occurrence phases of surface sediments from the East Philippine Sea[J].Marine Geology and Quaternary Geology,2007,27(2):51-58.]
[28] Sun S S,McDonough W F.Chemical and isotopic systematics of oceanic basalts:implication for mantle composition and processes[C]//In:Sauders,A D,Norry,M J(eds).Magmatism in the Ocean Basins.Geological Society (London) Special Publication,1989,42:313-345.
-
计量
- 文章访问数: 965
- PDF下载数: 2
- 施引文献: 0
下载: