Rare earth elements (REEs) and major elements of 25 cobalt-rich crusts obtained from different depths of Mid-Pacific M seamount were analyzed using inductively coupled plasma-atomic emission spectrometer and gravimetric method. The results showed that they were hydrogenous crusts with average ∑REE content of 2084.69 μg/g and the light REE (LREE)/heavy REE (HREE) ratio of 4.84. The shale-normalized REE patterns showed positive Ce anomalies. The total content of strictly trivalent REEs increased with water depth. The Ce content and LREE/HREE ratios in Fe-Mn crusts above 2000 m were lower than those below 2000 m. The change in REE with water depth could be explained by two processes: adsorptive scavenging by setting matters and behaviors of REE in seawater. However, the Ce abundance took no obvious correlation with water depth reflects the constant Ce flux. The Ce in crusts existed mainly as Ce(IV), implying that the oxidative-enriching process was controlled by kinetic factors.
参考文献
| [1] | De Carlo E H;McMurtry G M .Rare-earth element geochemistry of ferromanganese crusts from the Hawaiian Archipelago,Central Pacific[J].Chemical Geology,1992,95:235. |
| [2] | Tan Lvgui;Zhou Taofa;Yuan Feng;Fan Yu Yue Shuchang .Mechanism of Formation of the Premian Volcanic Rocks in Sawu'er Area,Xinjiang:Constraints from Rare Earth Elements[J].Journal of the Chinese Rare Earth Society,2006,24(05):626. |
| [3] | 蓝先洪,王红霞,张志珣,林振宏,李日辉,王中波.南黄海表层沉积物稀土元素分布与物源关系[J].中国稀土学报,2006(06):745-749. |
| [4] | 包申旭,周怀阳,彭晓彤,姚会强.Juan de Fuca洋脊Endeavour段热液硫化物稀土元素地球化学特征[J].地球化学,2007(03):303-310. |
| [5] | De Carlo E H .Paleoceanographic implications of rare earth element variability within a Fe-Mn crust from the central Pacific Ocean[J].Marine Geology,1991,98:449. |
| [6] | 赵宏樵.中太平洋富钴结壳稀土元素的地球化学特征[J].东海海洋,2003(01):19-26. |
| [7] | Chen Shouyu;Zhang Haisheng;Zhao Pengda .Rare earth element geochemistry of Co-rich crusts in the mid-pacific and south China sea[J].Marine Geology & Quaternary Geology (in Chin ),2006,26(04):45. |
| [8] | Aplin A C .Rare earth element geochemistry of central Pacific ferromanganese encrustation[J].Earth and Planetary Science Letters,1984,71:13. |
| [9] | 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. |
| [10] | 白志民,王英滨,姜波,刘旭,常有军,文智慧,庞宁.太平洋富钴结壳中稀土元素的赋存状态[J].地学前缘,2004(02):387-392. |
| [11] | Takahashi Y.;Usui A.;Kagi H.;Nomura M.;Shimizu H. .Direct observation of tetravalent cerium in ferromanganese nodules and crusts by X-ray-absorption near-edge structure (XANES)[J].Geochimica et Cosmochimica Acta: Journal of the Geochemical Society and the Meteoritical Society,2000(17):2929-2935. |
| [12] | 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. |
| [13] | Bao Gende;Li Quanxing .Geochemistry of rare earth elements in ferromanganese nodules (crusts) of the south China sea[J].Oceanologia et Limnologia Sinica (in Chin ),1993,24(03):304. |
| [14] | Nath B N;Roelandts I;Sudhakar M;Plüger W L Balaram V .Cerium anomaly variations in ferromanganese nodules and crusts from the Indian Ocean[J].Marine Geology,1994,120:385. |
| [15] | Bau M.;Dulski P.;Hein JR.;Koschinsky A. .COMPARISON OF THE PARTITIONING BEHAVIOURS OF YTTRIUM, RARE EARTH ELEMENTS, AND TITANIUM BETWEEN HYDROGENETIC MARINE FERROMANGANESE CRUSTS AND SEAWATER[J].Geochimica et Cosmochimica Acta: Journal of the Geochemical Society and the Meteoritical Society,1996(10):1709-1725. |
| [16] | Yao De;Zhang Lijie;John Wilshire;Charles Morgan Cui Ruyong .Mineralogy and geochemistry of ferromanganese crusts from Johnston Island EEZ[J].Marine Geology & Quaternary Geology (in Chin ),1996,16(01):33. |
| [17] | 任向文,刘季花,石学法,崔迎春,尹京武,郝金华.西太平洋Lamont海山中新世以来富钴结壳成矿环境的演化[J].海洋科学进展,2006(01):17-29. |
| [18] | Manheim F T .Marine cobalt resources[J].Science,1986,232:600. |
| [19] | Manheim F T;Lane-Bostwick C M .Cobalt in ferromanganese crusts as a monitor of hydrothermal discharge on the Pacific sea floor[J].Nature,1988,335:59. |
| [20] | Lawrence M G;Kamber B S .The behaviour of the rare earth elements during estuarine mixing-revisited[J].Marine Chemistry,2006,100:147. |
| [21] | 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,London:CRC Press,1999:239. |
| [22] | Kuhn T;Bau M;Blum N;Halbach P .Origin of negative Ce anomalies in mixed hydrothermal-hydrogenetic Fe-Mn crusts from the central indian ridge[J].Earth and Planetary Science Letters,1998,163:207. |
| [23] | Halbach P;Segl M;Puteanus D;Mangini A .Co-fluxes and growth rates in ferromanganese deposits from central Pacific seamount areas[J].Nature,1983,304:716. |
| [24] | Hein J R.Cobalt-rich ferromanganese crusts:Global distribution,composition,origin and research activities[A].Kingston,Jamaica:International Seabed Authority,2004:188. |
| [25] | R P RAJANI;V K BANAKAR;G PARTHIBAN;A V MUDHOLKAR;A R CHODANKAR .Compositional variation and genesis of ferromanganese crusts of the Afanasiy—Nikitin Seamount, Equatorial Indian Ocean[J].Journal of earth system science,2005(1):51-61. |
| [26] | Fitzgerald C E;Gillis K M .Hydrothermal manganese oxide deposits from Baby Bare seamount in the Northeast Pacific Ocean[J].Marine Geology,2006,225:145. |
| [27] | De Baar H J W;Bacon M P;Brewer P G;Bruland K W .Rare earth elements in the Pacific and Atlantic Oceans[J].Geochimica et Cosmochimica Acta,1985,49:1943. |
| [28] | Haskin M A;Haskin L A .Rare earth in European shales:a redetermination[J].Science,1966,154:507. |
| [29] | Cui Yingchun;Shi Xuefa;Liu Jihua;Ren Xiangwen .Effect of phospheration on elemental association in cobalt-rich crusts[J].Acta Mineralogica Sinica (in Chin ),2007,27(zk):334. |
| [30] | Halbach P;Puteanus D .The influence of the carbonate dissolution rate on the growth and composition of Co-rich ferromanganese crusts from Central Pacific seamount areas[J].Earth and Planetary Science Letters,1984,68:73. |
| [31] | Aplin A C;Cronan D S .Ferromanganese oxide deposits from the central Pacific Ocean,I.Encrustations from the Line Islands Archipelago[J].Geochimica et Cosmochemica Atca,1985,49:427. |
| [32] | Hodkinson R A;Cronan D S .Regional and depth variability in the composition of cobalt-rich ferromanganese crusts from the SOPAC area and adjacent parts of the central equatorial Pacific[J].Marine Geology,1991,98:437. |
| [33] | Koschinsky A;Hein J R .Uptake of elements from seawater by ferromanganese crusts:solid-phase associations and seawater speciation[J].Marine Geology,2003,198:331. |
| [34] | Elderfield H .The oceanic chemistry of the rare-earth elements[J].Philosophical Transactions of the Royal Society of London Series A Mathematical and Physical Sciences,1988,325(1583):105. |
| [35] | Ohta A.;Kawabe I. .Theoretical study of tetrad effects observed in REE distribution coefficients between marine Fe-Mn deposit and deep seawater, and in REE(III)-carbonate complexation constants[J].Geochemical Journal,2000(6):455-473. |
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