Rare earth element geochemistry characteristics and implications of pore-water from deep sea sediment in Western Pacific Ocean
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摘要:
为探索深海孔隙水中稀土元素的生物地球化学循环过程，对太平洋菲律宾海九州-帕劳海脊东、西两侧的两个钻孔沉积物进行了高精度的孔隙水采样工作，分析了主、微量元素和稀土元素的地球化学特征，并对稀土元素的浓度、配分模式以及分馏特征进行了详细的讨论。结果表明：这两个钻孔沉积物均处于氧化环境，表现出海水-沉积物界面和浅层孔隙水（2.5～20 cm）中相对富集轻稀土和中稀土，而中层（25～60 cm）和深层沉积物（＞65 cm）孔隙水中则相对富集重稀土元素的特征。初步推断有机质和锰（氢）氧化物的分解和吸附作用是造成孔隙水中稀土元素分馏的主要因素。相比于九州-帕劳海脊的东、西两侧海域，孔隙水中的稀土元素浓度和分馏程度存在一定的差异，周围环境中的矿物组成和锰（氢）氧化物等是其主要的控制因素，但是研究区域深海孔隙流体并不能为海洋贡献稀土元素。
Abstract:In order to explore the biogeochemical process of the rare earth elements in deep sea pore water, high-precision samples were collected from the two stations of the Philippine Sea. Geochemical characteristics of the main elements, trace elements and REE are analyzed and the concentration, distribution and fractionation of the REE discussed in details. It is found that both the two stations are in an oxidizing environment. HREE and MREE are enriched around the water-sediment interface and in the shallow pore water (2.5～20 cm), while MREE and HREE enriched in the middle (25～60 cm) and lower layers of sediments. We believe that the decomposition and adsorption of organic matter and Mn oxide are the main factors for the fractionation of REE in pore water. Concentrations and fractionations of REE in pore water are found different in the East and West sides of the Kyushu Palau Ridge because of the difference in volcanic activities, mineral composition and Mn oxide in the surrounding environment. However, the pore fluid of the study area makes no contribution of REE to the ocean.
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Key words:
- rare earth element /
- pore water /
- trace elements /
- geochemistry /
- Philippine Sea
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表 1 孔隙水中主量元素和微量元素的分析结果
Table 1. Concentrations of major and trace elements in the pore-water
站位 深度/cm Ca/(mg/L) K/(mg/L) Mn/(ng/L) Co/(ng/L) Cu/(ng/L) Zn/(ng/L) Sr/(μg/L) Mo/(μg/L) XTZZ40 2.5 259 367 796 5.5 108 2 574 6 561 9.17 7.5 259 363 428 2.3 50 1 713 6 663 6.78 10 259 392 414 3.1 52 2 137 6 593 10.4 25 258 394 346 3.4 65 1 449 6 432 9.34 42.5 259 425 390 6.5 135 2 984 6 386 11.1 45 259 433 445 5.1 253 3 955 6 465 11.4 55 255 431 445 4.0 60 958 6 409 12.9 60 265 441 421 4.5 73 947 6 929 12.4 65 261 450 664 6.3 111 2 758 6 648 12.3 75 267 433 397 3.7 52 1 634 6 154 11.8 95 263 405 376 5.7 59 927 6 379 13.6 100 305 457 233 2.9 106 1 116 6 510 16.2 XTZZ64 2.5 311 403 184 2.6 70 1 098 6 858 14.7 7.5 315 421 389 4.8 41 1 311 6 845 9.02 10 323 447 2 451 28.4 372 1 983 6 976 8.25 15 267 411 586 6.6 126 2 164 6 238 4.17 17.5 285 439 771 4.7 102 1 748 6 560 9.07 20 288 446 649 6.1 113 2 965 6 584 9.71 22.5 302 454 493 4.5 185 2 573 6 667 9.81 25 305 443 601 4.0 90 1 806 6 564 8.20 27.5 319 453 480 5.6 109 1 477 6 738 9.65 30 282 408 1 219 10.3 142 1 731 6 307 9.38 32.5 301 434 330 3.4 107 1 406 6 074 8.19 35 313 452 215 5.6 72 1 536 6 754 10.1 40 303 444 379 4.0 79 1 067 6 605 7.03 45 300 446 313 3.2 57 1 025 6 588 8.48 47.5 301 441 749 12.1 101 1 215 6 660 9.48 50 300 434 521 8.8 68 1 178 6 570 7.18 60 290 445 290 3.3 63 1 609 6 604 9.59 65 313 465 191 2.8 48 1 044 6 563 7.82 70 303 449 600 5.4 124 2 062 6 481 8.60 75 303 450 480 4.2 114 5 675 6 476 8.85 80 314 461 436 4.7 64 1 873 6 350 9.04 90 303 514 820 7.8 160 1 953 6 425 15.7 95 330 488 451 3.9 174 1 671 6 808 14.7 100 326 483 936 6.3 96 1 590 6 491 13.0 
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表 2 孔隙水中稀土元素的分析结果
Table 2. Concentration of REEs in the pore-water
pmol/kg 站位 深度/cm La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu XTZZ40 2.5 46.39 27.47 1.85 7.48 1.28 0.13 1.14 0.01 0.61 0.04 1.54 0.17 0.63 7.5 21.11 32.86 1.85 7.69 1.54 0.24 1.55 0.14 0.86 0.07 2.13 0.18 0.79 0.04 10 12.23 20.50 1.13 5.00 0.93 0.05 0.84 0.04 0.40 0.01 1.47 0.15 0.22 0.05 25 69.26 96.41 8.15 31.97 5.57 1.26 5.53 1.02 5.27 1.10 6.96 0.71 3.10 0.50 42.5 49.76 26.83 7.04 30.59 6.06 1.27 6.93 1.00 5.42 1.15 4.66 0.74 3.82 0.48 45 67.64 94.41 6.95 27.25 5.24 0.99 5.49 0.53 3.75 0.89 6.71 0.48 2.97 0.43 55 116.28 90.07 9.16 39.21 7.99 1.03 8.33 1.12 6.90 1.12 6.38 0.86 4.42 0.53 60 47.02 53.73 5.35 22.91 4.12 0.84 5.92 0.72 4.41 1.01 4.93 0.49 3.33 0.47 65 11.24 29.78 1.82 7.55 1.84 0.18 1.38 0.05 1.11 0.05 2.31 0.20 1.07 0.05 75 33.66 50.47 7.27 35.83 6.16 1.66 7.31 1.03 6.08 0.98 4.40 0.65 3.16 0.53 95 29.43 36.14 4.60 20.31 4.59 1.01 3.83 0.51 3.76 0.57 2.31 0.45 1.87 0.22 100 20.63 25.49 3.36 15.52 3.00 0.64 3.01 0.52 3.19 0.60 2.16 0.49 2.45 0.32 XTZZ64 2.5 44.87 38.31 6.10 24.79 3.96 1.22 8.05 0.97 5.62 1.39 5.44 0.71 3.54 0.55 7.5 50.60 24.61 3.92 19.45 3.76 0.72 4.29 0.47 4.99 0.82 3.61 0.49 2.66 0.37 10 45.50 27.82 4.82 21.61 3.33 0.51 4.76 0.69 4.38 1.03 3.43 0.53 2.53 0.32 15 40.60 29.18 4.54 21.50 2.92 0.49 4.37 0.52 3.37 0.66 2.74 0.48 2.14 0.26 17.5 48.26 47.08 4.54 20.05 3.58 0.48 4.53 0.53 4.80 0.80 4.14 0.46 2.36 0.34 20 39.60 49.56 4.60 20.62 3.72 2.17 4.53 0.65 3.86 0.82 4.37 0.54 2.29 0.46 22.5 37.32 47.22 4.31 21.54 4.25 0.68 5.03 0.54 3.96 0.90 4.85 0.38 3.01 0.46 25 36.51 35.31 4.11 18.31 4.74 0.57 4.89 0.56 3.61 1.00 3.53 0.39 2.23 0.32 27.5 35.82 36.06 3.70 17.56 2.94 0.15 3.74 0.57 3.20 0.43 3.48 0.47 2.36 0.23 30 42.04 52.90 4.26 20.66 3.32 0.44 3.88 0.59 3.03 0.72 4.92 0.37 2.47 0.25 32.5 34.90 31.23 4.34 17.10 4.03 0.61 4.11 0.53 3.33 0.83 2.80 0.52 2.07 0.33 35 42.45 48.02 4.09 19.71 3.54 0.74 4.56 0.57 3.64 0.72 4.31 0.53 2.54 0.29 40 42.13 36.63 6.21 29.64 6.45 1.39 7.82 0.96 6.17 1.28 5.14 0.75 3.57 0.72 45 40.92 41.99 4.00 18.25 3.51 0.64 4.37 0.46 3.45 0.77 4.30 0.48 2.55 0.26 47.5 34.90 43.08 4.38 21.82 3.60 0.54 4.51 0.53 3.37 0.96 3.17 0.52 1.99 0.26 50 40.03 42.99 4.88 20.79 4.80 0.80 5.97 0.96 4.31 1.07 4.75 0.71 3.64 0.69 60 34.30 36.40 4.16 20.40 3.10 0.51 3.68 0.56 3.40 0.81 3.57 0.39 2.77 0.34 65 28.47 37.17 3.62 14.79 2.44 0.61 4.36 0.48 3.65 0.86 3.81 0.40 2.25 0.33 70 30.87 37.43 4.11 18.45 2.28 0.53 3.89 0.48 4.07 0.92 3.65 0.48 2.46 0.35 75 33.55 40.68 4.41 19.66 3.25 0.63 4.38 0.56 4.15 0.71 4.21 0.45 2.65 0.36 80 36.05 51.44 4.86 20.51 2.91 0.70 4.72 0.58 4.30 0.93 4.05 0.61 3.31 0.34 90 35.91 34.89 4.70 20.10 3.27 0.81 4.21 0.47 3.56 0.74 2.95 0.47 2.80 0.33 95 33.35 42.42 3.67 17.19 3.63 0.56 3.38 0.45 2.98 0.59 3.74 0.39 2.09 0.27 100 30.61 49.24 4.17 19.18 2.78 0.48 5.27 0.28 2.97 0.78 4.15 0.42 2.65 0.31
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