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    江南造山带中段冷家溪群沉积物源及构造背景:以岳阳地区黄浒洞组为例

    田洋 金巍 王晶 柯贤忠 龙文国

    田洋, 金巍, 王晶, 柯贤忠, 龙文国, 2021. 江南造山带中段冷家溪群沉积物源及构造背景:以岳阳地区黄浒洞组为例. 地球科学, 46(4): 1328-1348. doi: 10.3799/dqkx.2020.101
    引用本文: 田洋, 金巍, 王晶, 柯贤忠, 龙文国, 2021. 江南造山带中段冷家溪群沉积物源及构造背景:以岳阳地区黄浒洞组为例. 地球科学, 46(4): 1328-1348. doi: 10.3799/dqkx.2020.101
    Tian Yang, Jin Wei, Wang Jing, Ke Xianzhong, Long Wenguo, 2021. Provenance and Tectonic Setting of Lengjiaxi Group in the Central Jiangnan Orogen: A Case Study of Huanghudong Formation, Yueyang Area. Earth Science, 46(4): 1328-1348. doi: 10.3799/dqkx.2020.101
    Citation: Tian Yang, Jin Wei, Wang Jing, Ke Xianzhong, Long Wenguo, 2021. Provenance and Tectonic Setting of Lengjiaxi Group in the Central Jiangnan Orogen: A Case Study of Huanghudong Formation, Yueyang Area. Earth Science, 46(4): 1328-1348. doi: 10.3799/dqkx.2020.101

    江南造山带中段冷家溪群沉积物源及构造背景:以岳阳地区黄浒洞组为例

    doi: 10.3799/dqkx.2020.101
    基金项目: 

    中国地质调查局地质调查项目 DD20160031

    中国地质调查局地质调查项目 DD20190050

    详细信息
      作者简介:

      田洋(1984-), 男, 硕士, 高级工程师, 从事沉积学与沉积地球化学研究工作.ORCID: 0000-0003-3422-4320.E-mail: 41834572@qq.com

    • 中图分类号: P534

    Provenance and Tectonic Setting of Lengjiaxi Group in the Central Jiangnan Orogen: A Case Study of Huanghudong Formation, Yueyang Area

    • 摘要: 为揭示江南造山带中段冷家溪群沉积物源与构造背景,选取湖南东北部岳阳地区黄浒洞组为研究对象,开展岩石学、沉积学、地球化学及锆石年代学研究工作.结果显示,黄浒洞组杂砂岩杂基含量高(常>25%),碎屑颗粒贫石英(25%~40%),富含长石(15%~25%)与岩屑(15%~30%),分选差,磨圆差-中等.全岩SiO2含量(63.39%~72.88%,平均70.14%)中等,(Fe2O3T+MgO)*(6.04%~8.29%,平均6.81%)与TiO2*(0.67%~0.92%,平均0.74%)含量较高,K2O/Na2O(0.84~2.35,平均1.43)比值高,Al2O3/SiO2(0.17~0.28,平均0.20)比值低,最接近形成于大陆岛弧环境杂砂岩的特征值.样品具有中等ICV值(平均0.86)与CIA值(70~80),指示物源包含再循环的古老沉积物与第1次循环物质,且源区经历了中等化学风化作用.杂砂岩样品稀土元素含量较高(ΣREE平均173.02×10-6),具有与上地壳及PAAS相似的球粒陨石标准化配分型式,呈现轻稀土富集((La/Yb)N平均7.32)、重稀土平坦、中度Eu负异常(Eu/Eu*0.58~0.70,平均0.66)特征,但与上地壳相比,明显富集重稀土((La/Yb)ucc平均0.70).1件凝灰岩夹层样品的锆石LA-ICP-MS U-Pb年龄为824 ±3.1 Ma,指示黄浒洞组沉积于新元古代.结合前人研究成果,黄浒洞组杂砂岩低的结构与成分成熟度,北东东-南东向的古水流,特征元素含量、比值及各类物源与构造环境判别图解,综合表明江南造山带中段岳阳地区冷家溪群沉积于弧后盆地,接受来自北侧构造相对稳定、物源成熟度较高的扬子陆块内部与南侧构造活动较强烈、物源成熟度较低的大陆岛弧的双向物源供给.

       

    • 图  1  华南板块前寒武纪地质简图

      地质图据Wang et al.(2013b), Yao et al.(2017);古水流方向据张恒等(2013).①政和-大甫断裂;②高阳-惠来断裂;③江山-绍兴断裂;④萍乡-郴州-临武-博白断裂;⑤凭祥-永福断裂;⑥石台-吉首断裂;⑦樟树墩-德兴-歙县断裂;⑧赣江隐伏断裂;⑨汨罗-湘潭隐伏断裂;⑩城步-永福断裂

      Fig.  1.  Simplified geological map of the South China block showing the distributions of major Precambrian tectonic units and igneous rocks

      图  2  岳阳地区地质简图

      1. 第四系;2. 上白垩-古新统;3. 寒武系;4. 震旦系;5. 南华系;6. 青白口纪板溪群;7. 青白口纪小木坪组;8. 青白口纪黄浒洞组;9. 青白口纪雷神庙组;10. 白垩纪二云二长花岗岩;11. 侏罗纪含斑黑云二长花岗岩;12. 青白口纪花岗闪长岩;13. 地质界线;14. 角度不整合界线;15. 断层;16.剖面位置

      Fig.  2.  Sketch geological map of Yueyang area

      图  3  黄浒洞组代表性层位实测构造地层剖面及采样位置(PM019)

      Fig.  3.  Tectonic stratigraphic section and sample position of Huanghudong Formation (PM019)

      图  4  黄浒洞组野外及镜下照片

      a.变质杂砂岩夹板岩中发育的紧闭褶皱;b.沟模构造,指示地层倒转,恢复后古水流方向105°;c.波痕,指示地层正常,恢复后古水流方向84°;d.鲍马序列AB、AE组合及沟模构造;e.变质中-细粒长石岩屑杂砂岩;f.凝灰岩,变质为绢云母板岩(PM019-39-1b). Pl.斜长石; Q.单晶石英; Qp.多晶石英岩屑; Ms.泥质岩岩屑; Che.燧石岩屑; Ser.绢云母; Lm.褐铁矿

      Fig.  4.  Field photos and photomicrographs of Huanghudong Formation

      图  5  黄浒洞组沉凝灰岩锆石阴极发光及U-Pb谐和图

      Fig.  5.  Cathodoluminescence images and U-Pb concordia plots of Huanghudong Formation tuffite

      图  6  黄浒洞组杂砂岩分类lg(SiO2/Al2O3)-lg(Na2O/K2O)图解(据Pettijohn et al., 1987

      双桥山群砂岩数据据Wang and Zhou(2013)

      Fig.  6.  Sandstone discrimination diagram (lg(SiO2/Al2O3) vs. lg(Na2O/K2O)) for Huanghudong Fomation (after Pettijohn et al., 1987)

      图  7  黄浒洞组杂砂岩稀土元素球粒陨石(a)与上地壳(b)标准化配分图

      球粒陨石与PAAS值据Taylor and McLennan(1985),上地壳据Rudnick and Gao(2003)

      Fig.  7.  Chondrite-normalized (a) and UCC-normalized (b) REE patterns for Huanghudong Formation greywackes

      图  8  黄浒洞组杂砂岩A-CN-K图解

      To.英云闪长岩;Gd.花岗闪长岩;Gr.花岗岩;Pl.斜长石;Kfs.钾长石;Ka.高岭石;Gi.水铝矿;Sm.蒙脱石;Chl.绿泥石;Il.伊利石;①, ②表示K化趋势. 图据Nesbitt and Young(1982)Fedo et al.(1995)

      Fig.  8.  A-CN-K diagram (in molecular proportion) for Huanghudong Formation greywackes

      图  9  黄浒洞组杂砂岩F1-F2物源判别图解(据Roser and Korsch, 1988

      江西双桥山群数据来自Wang and Zhou(2013);平江冷家溪群数据来自杨雪等(2020),下同

      Fig.  9.  Discrimination function diagram (F1 vs. F2) for illustrating sedimentary provenance of Huanghudong Formation greywackes (after Roser and Korsch, 1988)

      图  10  黄浒洞组杂砂岩F3-F4构造环境判别图解(据Bhatia, 1983

      PM.被动大陆边缘;ACM.活动大陆边缘;OIA.大洋岛弧;CIA.大陆岛弧

      Fig.  10.  Tectonic discrimination diagram (F3 vs.F4) of the Huanghudong Formation greywackes (after Bhatia, 1983)

      图  11  黄浒洞组杂砂岩(Fe2O3T+MgO)*-TiO2*(a)、(Fe2O3T+MgO)*-Al2O3/SiO2(b)、SiO2-K2O/Na2O(c)与K2O/Na2O-SiO2/Al2O3(d)构造环境判别图解

      PM.被动大陆边缘;ACM.活动大陆边缘;OIA.大洋岛弧;CIA.大陆岛弧;A1.玄武质和安山质碎屑的岛弧环境;A2.长英质侵入岩碎屑的进化岛弧环境. 图a和图b据Bhatia(1983);图c和图d据Roser and Korsch(1986)

      Fig.  11.  (Fe2O3T+MgO)* vs. TiO2*(a), (Fe2O3T+MgO)* vs. Al2O3/SiO2(b), SiO2 vs. K2O/Na2O (c) and K2O/Na2O vs. SiO2/Al2O3 (d) of greywackes from Huanghudong Formation

      图  12  黄浒洞组杂砂岩微量元素La-Th-Sc(a)、Th-Sc-Zr/10(b)、Th-Co-Zr/10(c)、Sc/Cr-La/Y(d)和La/Sc-Ti/Zr(e)构造环境判别图解(据Bhatia and Crook, 1986

      Fig.  12.  Tectonic discrimination diagrams of the Huanghudong Formation greywackes based on La-Th-Sc (a), Th-Sc-Zr/10 (b), Th-Co-Zr/10 (c), Sc/Cr-La/Y (d) and La/Sc-Ti/Zr (e) (after Bhatia and Crook, 1986)

      图  13  黄浒洞组杂砂岩微量元素平均(比)值与不同构造环境杂砂岩元素对比

      Bhatia (1985); Bhatia and Crook (1986); 虚线为不同构造环境下形成的杂砂岩元素含量(10-6)及比值的连线

      Fig.  13.  log-log plots for multi trace elements and their ratios, with reference to (a) oceanic island arc (OIA), (b) continental island arc (CIA), (c) active continental margin (ACM), and (d) passive margin (PM)

      表  1  黄浒洞组杂砂岩元素含量及特征元素比值

      Table  1.   Element contents and characteristic parameters of graywackes from Huanghudong Formation

      样品号 3-1H 6-1H 8-1H 12-1H 15-1H 26-1H 29-1H 39-1H 41-1H 41-2H 41-3H 44-1H 53-1H 54-1H 57-1H 69-1H 70-1H 平均值
      Na2O 2.08 1.11 1.57 1.75 1.78 1.55 2.41 2.23 2.32 1.83 2.33 1.68 2.48 2.24 2.19 1.86 1.81 1.95
      MgO 1.21 1.07 1.05 1.05 1.48 1.25 1.08 1.45 1.24 1.18 1.29 1.33 1.24 1.35 1.36 1.15 1.45 1.25
      Al2O3 12.90 13.73 14.38 13.76 17.67 12.60 16.47 13.85 15.19 13.18 14.66 15.15 14.56 13.77 13.89 12.64 14.76 14.30
      SiO2 72.39 71.79 70.79 71.09 63.39 72.88 69.37 70.79 68.49 72.10 69.70 68.33 69.44 71.04 70.62 71.71 68.54 70.14
      P2O5 0.13 0.06 0.06 0.14 0.16 0.14 0.14 0.13 0.15 0.15 0.13 0.13 0.14 0.14 0.14 0.16 0.15 0.13
      K2O 2.04 2.61 2.43 2.66 3.85 2.51 2.02 2.70 2.78 2.44 2.71 3.29 2.62 2.49 2.67 2.39 3.04 2.66
      CaO 0.32 0.07 0.11 0.23 0.29 0.25 0.27 0.40 0.35 0.31 0.28 0.29 0.30 0.27 0.30 0.33 0.30 0.28
      TiO2 0.67 0.72 0.72 0.69 0.88 0.65 0.67 0.67 0.77 0.71 0.69 0.71 0.71 0.71 0.68 0.78 0.76 0.72
      MnO 0.03 0.03 0.03 0.02 0.04 0.03 0.03 0.06 0.03 0.03 0.04 0.04 0.05 0.07 0.04 0.07 0.09 0.04
      Fe2O3T 5.07 5.08 5.07 5.29 6.46 5.10 4.78 5.16 5.35 4.85 5.20 5.48 5.30 5.34 5.30 5.85 6.01 5.33
      Fe2O3 3.98 4.17 4.34 4.44 4.74 3.63 3.35 1.32 3.89 3.70 2.59 4.28 3.76 1.54 3.37 4.80 2.86 3.57
      FeO 0.98 0.82 0.65 0.77 1.55 1.32 1.28 3.45 1.32 1.03 2.35 1.08 1.38 3.42 1.73 0.95 2.83 1.58
      CO2 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.09 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.03
      Lost 2.99 3.36 3.53 3.05 3.81 2.88 2.39 2.20 2.95 2.84 2.61 3.19 2.81 2.21 2.45 2.69 2.72 2.86
      SUM 99.73 99.54 99.66 99.65 99.64 99.70 99.49 99.25 99.48 99.52 99.37 99.50 99.48 99.25 99.44 99.52 99.31 99.50
      TiO2* 0.69 0.75 0.75 0.71 0.92 0.67 0.69 0.69 0.79 0.74 0.71 0.73 0.73 0.73 0.70 0.80 0.78 0.74
      (Fe2O3T +MgO)* 6.50 6.39 6.36 6.57 8.29 6.56 6.04 6.80 6.83 6.24 6.71 7.07 6.77 6.89 6.86 7.23 7.72 6.81
      K2O/Na2O 0.98 2.35 1.54 1.51 2.17 1.62 0.84 1.21 1.20 1.33 1.17 1.96 1.06 1.11 1.22 1.29 1.68 1.43
      Al2O3/SiO2 0.18 0.19 0.20 0.19 0.28 0.17 0.24 0.20 0.22 0.18 0.21 0.22 0.21 0.19 0.20 0.18 0.22 0.20
      K(%) 0.88 1.12 1.05 1.14 1.67 1.08 0.86 1.16 1.20 1.05 1.16 1.42 1.12 1.06 1.14 1.02 1.31 1.14
      Ti(%) 0.41 0.45 0.45 0.43 0.55 0.40 0.42 0.41 0.48 0.44 0.43 0.44 0.44 0.44 0.42 0.48 0.47 0.44
      ICV 0.89 0.78 0.76 0.85 0.84 0.90 0.68 0.91 0.85 0.86 0.86 0.85 0.87 0.91 0.90 0.98 0.91 0.86
      CIA 67.50 74.16 72.63 69.01 69.88 68.76 71.27 65.44 67.04 67.93 66.85 68.82 66.15 66.70 66.37 66.91 68.42 68.46
      F1 -1.66 -2.37 -1.46 -1.73 -0.88 -2.74 0.65 -2.04 -1.03 -2.31 -1.36 -1.97 -1.11 -1.70 -1.84 -1.84 -1.70 -1.59
      F2 -2.19 -2.68 -2.17 -1.64 -0.30 -2.42 -1.29 -1.23 -0.67 -1.86 -0.88 -1.07 -0.76 -1.49 -1.29 -2.11 -1.51 -1.50
      F3 -1.77 -3.19 -2.89 -2.08 -1.69 -1.95 -1.13 -0.44 -1.27 -1.76 -0.89 -2.02 -1.30 -0.52 -1.31 -2.15 -1.24 -1.62
      F4 1.58 0.38 0.79 0.70 -0.85 0.53 0.77 -1.82 0.44 1.12 -0.79 -0.24 0.48 -1.31 -0.05 1.46 -1.26 0.11
      Sc 12.30 13.30 12.80 12.20 18.40 10.90 12.30 12.20 13.60 11.70 14.10 14.70 12.90 12.50 12.50 12.20 14.40 13.12
      V 78.80 84.70 87.30 81.70 121.00 71.10 75.30 82.30 92.10 84.30 77.60 84.90 83.20 87.40 84.60 98.00 94.20 86.39
      Cr 59.30 62.20 59.30 52.90 69.30 55.30 68.40 51.20 62.50 63.20 56.90 59.30 54.10 60.30 55.10 76.70 62.60 60.51
      Co 4.85 6.00 9.51 9.34 6.79 11.00 6.79 12.30 6.53 8.33 2.96 9.74 5.22 11.50 11.30 10.50 10.90 8.44
      Ni 19.80 18.80 22.20 23.90 26.80 22.40 24.70 22.90 19.70 20.90 19.40 22.20 21.70 23.80 20.90 21.20 27.10 22.26
      Rb 80.20 102.00 101.00 113.00 163.00 101.00 98.10 112.00 113.00 97.90 121.00 151.00 113.00 103.00 109.00 101.00 127.00 112.10
      Ba 284.00 348.00 326.00 354.00 497.00 301.00 301.00 342.00 366.00 302.00 349.00 446.00 331.00 317.00 328.00 318.00 373.00 346.03
      Cs 5.41 6.46 8.66 8.32 9.59 9.25 6.83 7.43 7.91 8.53 8.16 13.00 10.60 16.70 11.30 11.50 9.32 9.36
      Sr 112.00 63.20 87.30 90.00 92.60 81.90 108.00 122.00 102.00 84.30 107.00 85.60 106.00 108.00 99.20 112.00 91.80 97.25
      Y 27.60 27.00 34.70 32.90 37.50 28.90 35.00 27.70 32.00 28.40 35.10 36.30 29.40 29.80 29.30 31.10 32.80 31.50
      Zr 231.00 261.00 229.00 199.00 228.00 234.00 252.00 197.00 252.00 272.00 253.00 253.00 203.00 256.00 210.00 314.00 239.00 240.13
      Nb 9.87 10.70 10.20 9.77 13.00 9.44 11.90 9.74 11.30 10.20 13.10 13.70 10.50 10.70 10.30 10.90 11.30 10.98
      Ta 0.69 0.76 0.75 0.70 0.97 0.69 0.92 0.70 0.79 0.73 0.99 1.13 0.77 0.77 0.72 0.72 0.80 0.80
      Lu 0.41 0.43 0.48 0.46 0.57 0.42 0.48 0.42 0.49 0.45 0.51 0.53 0.45 0.45 0.41 0.45 0.48 0.46
      Hf 6.01 6.86 6.24 5.48 6.12 6.15 6.79 5.32 6.59 7.00 6.83 6.96 5.48 6.64 5.44 7.94 6.23 6.36
      Pb 5.32 8.83 12.00 7.82 12.00 7.70 13.40 10.70 6.28 7.06 9.37 13.40 9.46 32.00 7.03 10.80 9.67 10.76
      Th 9.45 10.40 10.10 9.55 12.80 9.46 13.50 9.57 10.80 10.30 15.50 15.60 9.82 10.40 9.61 10.50 10.50 11.06
      U 1.93 2.07 2.32 1.93 2.59 1.91 3.78 1.99 2.15 2.40 2.82 2.37 2.41 2.99 1.87 2.24 2.28 2.36
      La 28.50 35.70 44.90 36.40 34.20 33.00 38.50 29.60 30.10 29.10 38.60 35.80 28.70 34.60 29.80 40.70 36.70 34.40
      Ce 56.50 72.30 88.10 69.40 71.70 68.50 78.60 62.40 60.20 61.60 83.50 74.80 62.30 73.10 60.50 83.50 79.00 70.94
      Pr 6.86 8.08 10.70 8.14 8.52 7.76 9.04 7.03 7.13 6.92 9.26 8.84 6.89 8.10 7.05 9.12 8.70 8.13
      Nd 25.90 30.60 41.90 31.40 33.50 30.00 34.30 27.30 27.70 26.60 34.80 33.80 26.40 30.70 27.50 34.90 33.80 31.24
      Sm 5.56 5.89 8.12 6.68 7.01 6.31 7.17 5.59 6.02 5.53 7.49 7.22 5.61 6.12 5.72 6.72 7.21 6.47
      Eu 1.17 1.26 1.71 1.34 1.45 1.36 1.47 1.14 1.17 1.13 1.35 1.30 1.16 1.31 1.25 1.45 1.48 1.32
      Gd 4.82 4.85 6.79 6.12 6.30 5.26 6.31 4.94 5.24 5.03 6.38 6.27 5.02 5.35 5.12 5.96 6.40 5.66
      Tb 0.81 0.82 1.02 0.98 1.06 0.86 1.00 0.78 0.87 0.80 1.02 1.02 0.85 0.85 0.84 0.90 0.97 0.91
      Dy 4.95 4.80 6.01 5.81 6.42 5.13 5.95 4.76 5.43 4.96 5.95 6.25 5.10 5.14 5.10 5.59 5.89 5.49
      Ho 0.96 0.96 1.18 1.13 1.33 1.00 1.18 0.96 1.10 1.00 1.23 1.28 1.02 1.06 1.03 1.07 1.15 1.10
      Er 2.82 2.85 3.40 3.29 3.88 2.88 3.33 2.98 3.35 2.98 3.57 3.78 3.13 3.06 3.03 3.16 3.38 3.23
      Tm 0.43 0.45 0.50 0.50 0.61 0.45 0.50 0.46 0.52 0.47 0.55 0.57 0.47 0.47 0.48 0.50 0.51 0.50
      Yb 2.78 2.94 3.19 3.22 3.87 2.88 3.38 2.92 3.46 2.90 3.51 3.76 2.99 3.08 3.03 3.10 3.18 3.19
      Th/U 4.89 5.04 4.35 4.94 4.95 4.95 3.58 4.81 5.02 4.27 5.52 6.61 4.07 3.49 5.13 4.69 4.60 4.76
      Zr/Hf 38.49 38.06 36.73 36.31 37.24 38.06 37.05 37.01 38.21 38.88 37.09 36.35 37.04 38.57 38.59 39.56 38.27 37.74
      Zr/Th 24.47 25.01 22.68 20.83 17.75 24.73 18.60 20.58 23.26 26.52 16.31 16.18 20.65 24.54 21.86 29.90 22.72 22.15
      La/Y 1.04 1.32 1.29 1.11 0.91 1.14 1.10 1.07 0.94 1.02 1.10 0.99 0.97 1.16 1.02 1.31 1.12 1.09
      La/Th 3.02 3.42 4.44 3.81 2.66 3.49 2.85 3.10 2.78 2.84 2.48 2.29 2.92 3.32 3.10 3.88 3.50 3.17
      La/Sc 2.31 2.69 3.50 2.99 1.86 3.02 3.14 2.43 2.22 2.49 2.73 2.43 2.23 2.77 2.38 3.32 2.55 2.65
      Th/Sc 0.77 0.79 0.79 0.79 0.70 0.87 1.10 0.79 0.80 0.88 1.10 1.06 0.76 0.83 0.77 0.86 0.73 0.85
      Ti/Zr 17.95 17.28 19.58 21.37 24.21 17.15 16.51 20.87 18.92 16.23 16.79 17.36 21.63 17.09 19.96 15.32 19.64 18.70
      ∑REE 142.41 171.87 218.03 174.86 180.37 165.89 191.20 151.32 152.66 149.51 197.64 185.22 150.07 173.37 150.87 197.13 188.90 173.02
      ∑LREE/∑HREE 6.93 8.49 8.66 7.13 6.50 7.78 7.64 7.31 6.46 7.05 7.70 6.89 6.89 7.91 6.92 8.50 7.61 7.43
      Ce/Ce* 0.92 0.97 0.92 0.91 0.97 0.98 0.96 0.99 0.94 0.99 1.01 0.96 1.01 1.00 0.95 0.98 1.01 0.97
      Eu/Eu* 0.67 0.70 0.68 0.63 0.66 0.70 0.66 0.65 0.63 0.64 0.58 0.58 0.65 0.68 0.69 0.69 0.65 0.66
      La/Yb 10.26 12.13 14.08 11.29 8.82 11.43 11.41 10.15 8.67 10.04 10.97 9.53 9.59 11.23 9.84 13.13 11.57 10.83
      (La/Yb)N 6.93 8.20 9.51 7.63 5.96 7.73 7.71 6.86 5.86 6.78 7.41 6.44 6.48 7.59 6.65 8.87 7.82 7.32
      (La/Yb)UCC 0.66 0.78 0.91 0.73 0.57 0.74 0.74 0.65 0.56 0.65 0.71 0.61 0.62 0.72 0.64 0.85 0.75 0.70
      注:TiO2*与(Fe2O3T+MgO)*表示不含挥发分的含量;Fe2O3T = Fe2O3+1.111 3×FeO,SUM不包括Fe2O3T含量;F1,F2函数系数据Roser and Korsch(1988)F3,F4函数系数据Bhatia(1983);Eu/Eu* =2×EuN/(SmN+GdN);Ce/Ce*= 2×CeN/(LaN+NdN);下标N表示元素相对于球粒陨石标准化;下标UCC表示元素相对于上陆壳标准化;上地壳值参考Rudnick and Gao(2003);球粒陨石与PAAS值参考Taylor and McLennan(1985).主量元素单位10-2,微量元素单位10-6,下同.
      下载: 导出CSV

      表  2  冷家溪群及板溪群底部形成时代

      Table  2.   The depositional age of Lengjiaxi Group and bottom of Banxi Group

      岩石地层 锆石测年方法 岩性 年龄(Ma) 地点 资料来源
      板溪群 横路冲组 LA-ICP-MS U-Pb 凝灰岩 820±3 沅陵马底驿 孟庆秀等, 2013
      张家湾组 SHRIMP U-Pb 斑脱岩 803±7.6 临湘陆城 高林志等, 2011
      冷家溪群 小木坪组 SHRIMP U-Pb 斑脱岩 822±11 临湘陆城 高林志等, 2011
      SHRIMP U-Pb 凝灰岩 845±12 石门杨家坪 孙海清等, 2012
      LA-ICP-MS U-Pb 板岩 845±18 平江小水洞 杨雪等, 2020
      黄浒洞组 LA-ICP-MS U-Pb 凝灰岩 824±3.1 岳阳机场 本次工作
      LA-ICP-MS U-Pb 沉凝灰岩 824±5.4 岳阳胡家坳 本次工作
      SHRIMP U-Pb 凝灰岩 829±13 临湘羊楼司 孙海清等, 2012
      LA-ICP-MS U-Pb 砂岩 856±4 平江小水洞 杨雪等, 2020
      易家桥组 SHRIMP U-Pb 凝灰岩 862±11 平江道贯 孙海清等, 2012
      下载: 导出CSV

      表  3  黄浒洞组杂砂岩与不同构造环境杂砂岩特征主量元素(10-2)、微量元素(10-6)、稀土元素(10-6)对比

      Table  3.   Comparison graywackes major(10-2), trace(10-6) and rare earth (10-6) element characteristics of Huanghudong Formation with graywackes formed in different tectonic settings

      构造环境 大洋岛弧 大陆岛弧 活动大陆边缘 被动大陆边缘 黄浒洞组平均值(n=17)
      (Fe2O3T+MgO)* 8~14 5~8 2~5 富SiO2、贫Na2O、CaO、TiO2 6.81±0.55
      TiO2* 0.8~1.4 0.5~0.7 0.25~0.45 0.74±0.06
      Al2O3/SiO2 0.24~0.33 0.15~0.22 0.20±0.03
      K2O/Na2O 0.2~0.4 0.4~0.8 ≈1 1.43±0.42
      Pb 6.9±1.4 15.1±1.1 24.0±1.1 16.0±3.4 10.76±5.98
      Th 2.27±0.70 11.1±1.1 18.8±3.0 16.7±3.5 11.06±2.04
      Zr 96±20 229±27 179±33 298±80 240.13±29.64
      Hf 2.1±0.6 6.3±2.0 6.8 10.1 6.36±0.70
      Nb 2.0±0.4 8.5±0.8 10.7±1.4 7.9±1.9 10.98±1.27
      Sc 19.5±5.2 14.8±1.7 8.0±1.1 6.0±1.4 13.12±1.68
      V 131±40 89.0±13.7 48.0±5.9 31.0±9.9 86.39±11.13
      Th/U 2.10±0.78 4.60±0.45 4.80±0.38 5.60±0.7 4.76±0.72
      Zr/Hf 45.7 36.3 26.3 29.5 37.74±0.95
      Zr/Th 48.0±13.4 21.5±2.4 9.5±0.7 19.1±5.8 22.15±3.67
      La/Y 0.48±0.12 1.02±0.07 1.33±0.09 1.31±0.26 1.09±0.12
      La/Th 4.26±1.20 2.36±0.30 1.77±0.10 2.20±0.47 3.17±0.55
      La/Sc 0.55±0.22 1.82±0.30 4.55±0.80 6.25±1.35 2.65±0.43
      Th/Sc 0.15±0.08 0.85±0.13 2.59±0.50 3.06±0.80 0.85±0.13
      Ti/Zr 56.8±21.4 19.7±4.3 15.3±2.4 6.74±0.90 18.70±2.36
      La 8.0±1.7 27.0±4.5 37 39 34.40±4.73
      Ce 19.0±3.7 59.0±8.2 78 85 70.94±9.46
      Eu/Eu* 1.04±0.11 0.79±0.13 0.60 0.56 0.66±0.04
      ∑REE 58±10 146±20 186 210 173.02±21.57
      ∑LREE/∑HREE 3.8±0.9 7.7±1.7 9.1 8.5 7.43±0.68
      La/Yb 4.2±1.3 11.0±3.6 12.5 15.9 10.83±1.45
      (La/Yb)N 2.8±0.9 7.5±2.5 8.5 10.8 7.32±0.98
      注:据Bhatia(1983, 1985)和Bhatia and Crook(1986).
      下载: 导出CSV
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