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    浙江煤山牙形石微区原位REE组成及古环境意义

    陈剑波 赵来时 陈中强 童金南 周炼 胡兆初 陈泳霖

    陈剑波, 赵来时, 陈中强, 童金南, 周炼, 胡兆初, 陈泳霖, 2012. 浙江煤山牙形石微区原位REE组成及古环境意义. 地球科学, 37(1): 25-34. doi: 10.3799/dqkx.2012.003
    引用本文: 陈剑波, 赵来时, 陈中强, 童金南, 周炼, 胡兆初, 陈泳霖, 2012. 浙江煤山牙形石微区原位REE组成及古环境意义. 地球科学, 37(1): 25-34. doi: 10.3799/dqkx.2012.003
    CHEN Jian-bo, ZHAO Lai-shi, CHEN Zhong-qiang, TONG Jin-nan, ZHOU Lian, HU Zhao-chu, CHEN Yong-lin, 2012. In Situ Rare Earth Elements in Conodont from Meishan Section in Zhejiang Province and Implications for Paleoenvironmental Evolution. Earth Science, 37(1): 25-34. doi: 10.3799/dqkx.2012.003
    Citation: CHEN Jian-bo, ZHAO Lai-shi, CHEN Zhong-qiang, TONG Jin-nan, ZHOU Lian, HU Zhao-chu, CHEN Yong-lin, 2012. In Situ Rare Earth Elements in Conodont from Meishan Section in Zhejiang Province and Implications for Paleoenvironmental Evolution. Earth Science, 37(1): 25-34. doi: 10.3799/dqkx.2012.003

    浙江煤山牙形石微区原位REE组成及古环境意义

    doi: 10.3799/dqkx.2012.003
    基金项目: 

    国家自然科学基金 40972003

    国家自然科学基金重点项目 90714010

    国家自然科学基金创新研究群体项目 40621002

    地质过程与矿产资源国家重点实验室科技部专项资金 MSFGPMR201010

    地质过程与矿产资源国家重点实验室科技部专项资金 MSFGPMR201002

    详细信息
      作者简介:

      陈剑波(1986-),男,硕士,主要研究方向为生物地球化学

      通讯作者:

      赵来时,E-mail: lszhao@cug.edu.cn

    • 中图分类号: Q911

    In Situ Rare Earth Elements in Conodont from Meishan Section in Zhejiang Province and Implications for Paleoenvironmental Evolution

    • 摘要: 本文利用激光剥蚀电感耦合等离子体质谱(LA-ICPMS),对煤山D剖面包含二叠纪-三叠纪界线层的牙形石中色变指数(CAI)较低的部分进行微区原位微量元素分析,并与利用溶解法测定的相应的沉积碳酸盐岩围岩稀土元素(REE)的组成进行了对比,探讨了它们的稀土元素组成对环境变化响应的差异及其可能的原因.结果显示,无论是稀土总量ΣREE,还是Ce异常值,牙形石的微区原位REE信息比围岩更能反映出当时的环境变化.这表明牙形石化石比围岩对环境变化更加敏感,利用牙形石微区LA-ICPMS微量元素分析的方法是可靠的.同时,牙形石的Ce异常值还能对早三叠世的环境有较好的指示意义,为二叠纪与三叠纪之交大绝灭主幕开始到早三叠世环境的剧烈变化和长期缺氧环境提供了新的证据.

       

    • 图  1  煤山剖面采样位置及交通

      Fig.  1.  Geographic position and transportation of sampling at Meishan section

      图  2  LA-ICPMS对BCR-2G玻璃标准样品分析结果与参考值相对偏差对比(标样推荐值来自Gao et al., 2002)

      Fig.  2.  Relative deviation of average concentrations in BCR-2G obtained in this study by LA-ICPMS vs. the reference values

      图  3  煤山D剖面牙形石的(La/Yb)N-(La/Sm)N

      Fig.  3.  (La/Yb)N vs. (La/Sm)N of conodonts from Meishan D section

      图  4  煤山D剖面牙形石(a)及其围岩稀土元素(b)配分曲线

      Fig.  4.  Normalized REE distribution patterns of conodonts (a) and their surrounding rocks (b) from Meishan D section

      图  5  煤山D剖面牙形石及其围岩的稀土总量ΣREE和Ce异常曲线

      Fig.  5.  ΣREE and Ce anomalies of conodonts and their surrounding rocks

      表  1  LA-ICPMS仪器工作参数

      Table  1.   Laser ablation and ICPMS operating conditions

      激光剥蚀系统:GeoLas 2005 ICPMS: Agilent 7500a
      波长:193 nm, Excimer laser RF功率:1 350 W
      脉冲宽度:15 ns 等离子体流速:14.0 L·min-1
      能量密度:10 J·cm-2 辅助气流速:1. 0 L·min-1
      斑束直径:24 μm 采样深度:5.0 mm
      频率:8 Hz 离子透镜设置:Typical
      载气:氦气(0.70 L·min-1) 积分时间:10 ms
      补偿气:氩气(0.80 L·min-1) 检测器模式:Dual
      下载: 导出CSV

      表  2  煤山D剖面24~39层牙形石微量元素分析结果(10-6)

      Table  2.   Analysed trace elements of conodonts at the beds 24-39 from Meishan D section

      MD24A MD24B MD24C MD24D MD24E MD24E-2 MD24E-3 MD24E-4 MD25
      Co 0.04 0.02 0.04 0.03 0.02 0.03 0.02 0.02 0.05
      Ni 0.32 0.17 0.20 0.17 0.23 0.23 0.19 0.16 0.17
      Cu 0.89 0.80 0.84 3.48 1.05 0.64 0.36 1.26 1.22
      Zn 15.61 19.41 17.84 14.28 12.98 17.44 14.90 14.54 14.81
      Rb 0.07 0.02 0.03 0.21 0.02 0.02 0.03 0.03 0.19
      Sr 1142 1125 1110 1218 1229 1202 1162 1263 1234
      Y 5.87 4.32 2.51 6.63 12.57 14.97 10.48 18.74 21.09
      Ba 3.71 2.27 2.28 4.69 8.29 8.84 6.88 10.44 6.86
      La 5.39 3.79 2.80 6.01 7.77 8.66 6.42 9.58 18.64
      Ce 11.91 7.41 5.78 11.19 15.04 16.34 12.09 18.81 58.89
      Pr 1.64 1.05 0.86 1.76 2.37 2.84 1.90 3.36 10.09
      Nd 7.36 4.81 4.17 8.40 10.81 14.05 8.90 17.50 53.49
      Sm 1.65 1.07 0.99 2.13 3.17 4.22 2.67 5.20 16.15
      Eu 0.36 0.21 0.20 0.52 0.93 1.19 0.92 1.46 2.18
      Gd 1.72 1.12 0.98 2.14 3.31 4.65 2.86 5.88 14.42
      Tb 0.20 0.13 0.12 0.26 0.45 0.59 0.36 0.75 1.75
      Dy 1.07 0.67 0.48 1.28 2.10 2.90 2.00 3.55 6.99
      Ho 0.14 0.11 0.07 0.20 0.36 0.43 0.28 0.55 0.82
      Er 0.27 0.25 0.12 0.34 0.68 0.83 0.56 0.97 1.34
      Tm 0.02 0.03 0.01 0.04 0.04 0.07 0.05 0.07 0.12
      Yb 0.12 0.08 0.06 0.09 0.17 0.26 0.21 0.24 0.49
      Lu 0.01 0.00 0.01 0.01 0.03 0.03 0.02 0.03 0.05
      Pb 0.24 0.21 0.48 0.86 0.81 0.72 0.30 1.99 0.33
      Th 0.10 0.08 0.61 0.17 0.21 0.31 0.24 0.61 2.46
      U 0.74 0.70 0.17 0.45 0.40 0.53 0.31 0.78 0.09
      ΣREE 31.9 20.7 16.7 34.4 47.2 57.1 39.3 68.0 185.4
      Ce/Ce* 0.92 0.83 0.83 0.77 0.80 0.74 0.78 0.74 1.02
      Ω(Ce) -0.08 -0.17 -0.17 -0.23 -0.20 -0.26 -0.22 -0.26 0.02
      Eu/Eu* 0.97 0.88 0.91 1.12 1.31 1.23 1.53 1.21 0.66
      (La/Sm)N 0.63 0.68 0.54 0.54 0.47 0.39 0.46 0.35 0.22
      (La/Yb)N 4.42 4.86 4.83 6.53 4.49 3.37 3.00 4.01 3.80
      (Sm/Yb)N 7.05 7.15 8.89 12.02 9.53 8.54 6.49 11.32 17.11
      Th/La 0.02 0.02 0.22 0.03 0.03 0.04 0.04 0.06 0.13
      MD26 MD27A MD27A-2 MD27B MD27C MD27D MD28 MD28-2 MD29
      Co 0.03 0.03 0.08 0.02 0.02 0.03 0.02 0.02 0.02
      Ni 0.44 0.22 0.76 0.16 0.17 1.01 0.20 0.18 0.19
      Cu 7.08 0.69 5.57 1.36 0.25 3.93 1.26 0.21 2.55
      Zn 26.57 22.61 36.58 25.22 14.58 47.53 23.46 26.01 20.02
      Rb 0.13 0.03 0.19 0.23 0.03 0.16 0.04 0.08 0.03
      Sr 1206 2057 990 1009 3300 3431 1387 2834 1269
      Y 31.66 6.43 2.65 17.67 6.04 17.81 43.80 13.26 24.51
      Ba 2.13 6.09 2.21 11.05 22.71 13.08 9.71 12.12 9.21
      La 33.24 5.14 3.63 16.49 3.12 8.88 34.15 5.17 27.43
      Ce 110.08 17.47 13.52 48.78 10.60 33.65 113.74 18.08 63.58
      Pr 19.56 3.25 2.17 9.44 2.22 7.24 21.77 3.90 9.10
      Nd 86.35 17.20 8.82 45.08 13.06 41.87 115.38 21.72 42.65
      Sm 24.72 4.97 2.53 11.93 4.16 13.98 29.81 7.18 12.58
      Eu 3.76 0.70 0.37 2.34 0.63 2.37 5.25 1.25 2.08
      Gd 18.04 4.09 1.68 10.16 3.82 12.02 25.18 6.41 13.21
      Tb 2.36 0.44 0.26 1.11 0.37 1.22 2.70 0.68 1.40
      Dy 9.39 1.73 1.22 4.41 1.36 4.61 10.38 2.63 5.66
      Ho 1.21 0.23 0.16 0.61 0.19 0.63 1.39 0.41 0.78
      Er 2.22 0.29 0.33 1.02 0.30 0.94 2.32 0.72 1.38
      Tm 0.24 0.03 0.04 0.10 0.03 0.08 0.21 0.07 0.13
      Yb 1.13 0.13 0.20 0.43 0.14 0.28 0.80 0.28 0.63
      Lu 0.12 0.01 0.02 0.06 0.01 0.03 0.07 0.03 0.06
      Pb 149.56 0.26 322.16 14.84 0.27 1.28 0.38 0.43 0.32
      Th 2.16 3.13 15.48 5.48 2.31 3.89 0.32 9.45 0.35
      U 0.12 0.08 0.05 0.12 0.07 0.14 0.36 0.48 0.18
      ΣREE 312.4 55.7 35.0 152.0 40.0 127.8 363.2 68.5 180.7
      Ce/Ce* 1.11 1.05 1.28 0.97 0.97 1.04 1.02 1.00 0.92
      Ω(Ce) 0.11 0.05 0.28 -0.03 -0.03 0.04 0.02 0.00 -0.08
      Eu/Eu* 0.82 0.72 0.82 0.98 0.73 0.84 0.88 0.85 0.74
      (La/Sm)N 0.26 0.20 0.28 0.27 0.14 0.12 0.22 0.14 0.42
      (La/Yb)N 2.95 3.86 1.79 3.85 2.18 3.16 4.26 1.87 4.34
      (Sm/Yb)N 11.43 19.43 6.48 14.50 15.13 25.87 19.33 13.53 10.35
      Th/La 0.07 0.61 4.26 0.33 0.74 0.44 0.01 1.83 0.01
      MD29-1 MD29-2 MD30-1 MD33-3 MD34-2 MD35 MD36 MD38-1 MD39-2
      Co 0.03 0.03 0.08 0.02 0.03 0.03 0.03 0.02 0.03
      Ni 0.31 0.17 0.81 0.15 0.21 0.19 0.80 0.16 0.17
      Cu 1.05 3.33 7.90 2.98 0.62 0.41 3.93 0.25 2.23
      Zn 35.89 24.06 45.30 34.35 23.52 20.87 35.53 19.47 40.45
      Rb 0.03 0.06 0.35 0.05 0.06 0.02 0.11 0.02 0.06
      Sr 1147 1201 982 3820 1982 1734 3168 1713 2677
      Y 31.81 22.46 5.31 9.36 19.16 8.54 10.17 16.65 8.97
      Ba 6.89 7.54 11.41 14.17 7.17 18.74 52.63 10.37 5.13
      La 20.42 23.40 3.86 2.63 4.86 1.42 2.52 4.26 0.88
      Ce 51.65 55.31 19.13 14.20 28.41 9.90 17.08 27.41 7.56
      Pr 7.73 8.11 3.53 3.60 7.37 2.89 4.23 7.59 2.03
      Nd 39.75 40.00 17.87 24.12 50.23 23.07 29.83 51.85 17.97
      Sm 15.44 11.39 5.31 9.69 17.24 9.22 13.23 18.48 9.48
      Eu 2.92 1.82 0.90 1.55 2.57 1.59 2.07 2.97 1.82
      Gd 17.04 11.61 3.88 7.31 14.53 7.40 9.26 14.70 7.76
      Tb 2.05 1.31 0.51 0.79 1.52 0.75 1.03 1.52 0.74
      Dy 8.33 5.45 1.94 2.90 5.44 2.55 3.80 5.02 2.63
      Ho 1.11 0.73 0.25 0.33 0.68 0.30 0.40 0.57 0.33
      Er 1.93 1.31 0.44 0.59 0.98 0.42 0.67 0.72 0.44
      Tm 0.16 0.13 0.04 0.05 0.07 0.03 0.07 0.06 0.03
      Yb 0.80 0.57 0.23 0.26 0.28 0.13 0.32 0.21 0.14
      Lu 0.07 0.05 0.03 0.03 0.03 0.01 0.03 0.02 0.01
      Pb 1.02 0.50 198.96 9.14 0.07 0.09 115.07 0.19 0.11
      Th 27.55 0.49 34.17 5.35 1.74 0.45 13.10 0.50 3.82
      U 0.80 0.20 0.05 0.04 0.04 0.02 0.02 0.01 0.03
      ΣREE 169.4 161.2 57.9 68.1 134.2 59.7 84.5 135.4 51.8
      Ce/Ce* 0.93 0.91 1.37 1.19 1.24 1.27 1.37 1.29 1.45
      Ω(Ce) -0.07 -0.09 0.37 0.19 0.24 0.27 0.37 0.29 0.45
      Eu/Eu* 0.83 0.72 0.91 0.84 0.74 0.88 0.86 0.83 0.97
      (La/Sm)N 0.25 0.40 0.14 0.05 0.05 0.03 0.04 0.04 0.02
      (La/Yb)N 2.55 4.11 1.67 1.00 1.71 1.13 0.80 2.01 0.63
      (Sm/Yb)N 10.02 10.41 11.95 19.16 31.57 38.06 21.77 45.33 35.22
      Th/La 1.35 0.02 8.85 2.03 0.36 0.32 5.20 0.12 4.33
      下载: 导出CSV
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    • 收稿日期:  2011-03-25
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