利用ICP-OES和ICP-MS,分析了麦哲伦海山群西北端MK海山2170 m水深的MKD23B-3号富钴结壳样品,获得了其剖面上Ce,Co和P2O5含量数据.结果显示,该样品未磷酸盐化壳层的过剩Ce(Cexs)与Co含量之间呈明显的正相关关系,相关系数R2高达0.7893;与生长速率呈负相关关系,相关系数R2高达0.7211,表明壳层生长速率是制约结壳Ce含量的主因,高的Ce含量是低的生长速率造成的.在假设海水pH,Mn2+等条件不变的前提下,结壳生长速率正相关于Fe,Mn的沉积通量,而Fe,Mn的沉积通量正相关于海水中溶解氧含量.因此,在海水pH,Mn2+等条件不变的前提下,Cexs负相关于海水中溶解氧含量,海水溶解氧含量只是制约结壳Ce含量的间接因素,纠正了"结壳高Ce异常指示其形成时海水中高溶解氧含量"的认识.
参考文献
| [1] | Hein J R;Koschinsky A;Bau M;Manheim F T,Kang J K,Roberts L.Cobalt-rich ferromanganese crusts in the Pacific[A].Boca Raton,Florida CRC Press,2000:239. |
| [2] | 韩杰,武光海,叶瑛,邬黛黛.铁锰结壳中底层洋流活动的地球化学研究[J].矿床地质,2006(05):620-628. |
| [3] | 薛婷,孙晓明,张美,刘珊珊,何高文,王生伟,陆红锋.西太平洋海山富钴结壳稀土元素（REE）组成原位LA-ICPMS测定[J].岩石学报,2008(10):2423-2432. |
| [4] | Kuhn T;Bau M;Blum N;Halbach P .Origin of negative Ce anomalies in mixed hydrothermal-hydrugenetic Fe-Mn crusts from the Central Indian Ridge[J].Earth and Planetary Science Letters,1998,163:207. |
| [5] | Alibo D S;Nozaki Y .Rare earth elements in seawater:Particle association,shale-normalization,and Ce Oxidation[J].Geochimica et Cosmochimica Acta,1999,63(3/4):363. |
| [6] | Byrne R H .Inorganic speciatian of dissolved elements in seawater:the influence of pH on concentration ratios[J].Geochemical Transactions,2002,3(02):11. |
| [7] | Takahashi Y;Manceau A;Geoffroy N;Marcus MA;Usui A .Chemical and structural control of the partitioning of Co, Ce, and Pb in marine ferromanganese oxides[J].Geochimica et Cosmochimica Acta: Journal of the Geochemical Society and the Meteoritical Society,2007(4):984-1008. |
| [8] | Bau M;Koschinsky A .Oxidative scavenging of cerium on hydruns Fe oxide:evidence from the distribution of rare earth elements and yttrium between Fe oxides and Mn oxides in hydrogenetic ferromanganesc crusts[J].Geochemical Journal,2009,43:37. |
| [9] | Lécuyer C;Reynard B;Grandjean P .Rare earth element evolution of Phanerazoic seawater recorded in biogenetic apotites[J].Chemical Geology,2004,204:63. |
| [10] | Halbach P;Segl M;Puteanns D;Mangini A .Co-flux and growth rates in ferrumanganese deposits from central Pacific seamount areas[J].Nature,1983,304(5928):716. |
| [11] | Manheim F T;Lane-Bestwick C M .Cobalt in ferromanganese crusts as monitor of hydrothermal discharge on the Pacific seafloor[J].Nature,1988,335:59. |
| [12] | Johnson KS.;Berelson WM.;Gordon RM.;Coale KH. .ON THE FORMATION OF THE MANGANESE MAXIMUM IN THE OXYGEN MINIMUM[J].Geochimica et Cosmochimica Acta: Journal of the Geochemical Society and the Meteoritical Society,1996(8):1291-1299. |
| [13] | Roekens E J;Van Grieken R E .Kinetics of iron(Ⅱ) oxidation in seawater of various pH[J].Marine Chemistry,1983,13:195. |
| [14] | Koschinsky A;Stascheit I A;Bau M;Halbach P .Effects of phosphatization on the geochemical and mineralogical composition of marine ferromanganese crusts[J].Geochimica et Cosmochimica Acta,1997,61(19):4079. |
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