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    甘蒙北山后红泉地区海相玄武岩地球化学、年代学特征及成因

    郭小刚 陈守余 苟瑞 刘鑫 王秦 蒲强林

    郭小刚, 陈守余, 苟瑞, 刘鑫, 王秦, 蒲强林, 2021. 甘蒙北山后红泉地区海相玄武岩地球化学、年代学特征及成因. 地球科学, 46(11): 3945-3964. doi: 10.3799/dqkx.2020.378
    引用本文: 郭小刚, 陈守余, 苟瑞, 刘鑫, 王秦, 蒲强林, 2021. 甘蒙北山后红泉地区海相玄武岩地球化学、年代学特征及成因. 地球科学, 46(11): 3945-3964. doi: 10.3799/dqkx.2020.378
    Guo Xiaogang, Chen Shouyu, Gou Rui, Liu Xin, Wang Qin, Pu Qianglin, 2021. Geochemistry, Chronology and Genesis of Marine Basalts in Houhongquan Area, Beishan, Gansu and Inner Mongolia. Earth Science, 46(11): 3945-3964. doi: 10.3799/dqkx.2020.378
    Citation: Guo Xiaogang, Chen Shouyu, Gou Rui, Liu Xin, Wang Qin, Pu Qianglin, 2021. Geochemistry, Chronology and Genesis of Marine Basalts in Houhongquan Area, Beishan, Gansu and Inner Mongolia. Earth Science, 46(11): 3945-3964. doi: 10.3799/dqkx.2020.378

    甘蒙北山后红泉地区海相玄武岩地球化学、年代学特征及成因

    doi: 10.3799/dqkx.2020.378
    基金项目: 

    甘肃省基础地质调查项目 甘国土资勘发2016[33]-6

    甘肃省基础地质调查项目 2017[47]-17

    甘肃省基础地质调查项目 2018[45]-28

    详细信息
      作者简介:

      郭小刚(1989-), 男, 硕士研究生, 工程师, 主要研究矿产资源综合勘查与评价.ORCID: 0000-0003-4784-9741.E-mail: 491935960@qq.com

      通讯作者:

      陈守余, E-mail: sychen@cug.edu.cn

    • 中图分类号: P588;P595;P597

    Geochemistry, Chronology and Genesis of Marine Basalts in Houhongquan Area, Beishan, Gansu and Inner Mongolia

    • 摘要: 甘蒙北山地区发育的海相二叠系地层是中亚造山带南缘最年轻的海相沉积地层之一,为进一步探讨二叠纪古亚洲洋的关闭及后期的碰撞造山作用的时间节点,选取甘蒙北山后红泉地区二叠系海相火山岩-碎屑岩地层的5条代表性剖面进行了岩性-岩相及分布特征研究,并对海相地层中的玄武岩进行了岩相学、元素地球化学以及全岩Sr-Nd同位素等研究,同时选择剖面典型岩石进行了LA-ICP-MS锆石U-Pb定年.获得流纹英安岩与含砂亮泥晶生屑灰岩年龄分别为273±1.7 Ma和275.8±1.4 Ma,结合已发表年龄数据及古生物资料,明确了火山岩的喷发时代介于早二叠世亚丁斯克期-中二叠世沃德期,应厘定为双堡塘组;地球化学研究表明,后红泉地区玄武岩SiO2含量介于47.48%~54.56%,主要为玄武岩和玄武安山岩,属钠质拉斑玄武岩;稀土总量(ΣREE)较高,为74.90×10-6~173.61×10-6,LREE/HREE为2.32~6.55,表现出轻稀土相对重稀土轻微富集,(La/Yb)N=1.30~6.20,在球粒陨石标准化分布曲线整体上呈现LREE轻度富集、配分曲线平缓的特征,相对富集La、Ce、Nd、Zr、Hf等元素,不同程度地亏损Ta、Nb、P、Ti等元素,δEu=0.83~1.20,无明显的Eu异常;(87Sr/86Sr)i为0.702 024~0.706 432,εNdt)值介于1.99~6.54(除了-0.59和-0.83).因此,后红泉地区玄武岩岩浆是由接近原始地幔成分的石榴石二辉橄榄岩低程度熔融形成,其演化成岩过程中并未经地壳的强烈混染,而在岩浆源区发生了强烈的混染作用,推测软流圈地幔受到了陆源沉积岩、大陆地壳或蚀变大洋地壳改造,岩石圈拆沉作用可能是其产生的重要机制;说明古亚洲洋在早期已闭合,至早-中二叠世进一步拉张裂解形成了裂谷盆地.

       

    • 图  1  甘蒙北山地区构造地质简图

      聂风军等(2002)党犇等(2011)张新虎等(2013)修改. ①骆驼山-红石山-黑鹰山-雅干深大断裂;②明水-石板井-小黄山深断裂;③红柳河-牛圈子-洗肠井蛇绿岩带;④黑山-咸泉子深大断裂;⑤柳园-大奇山-帐房山深大断裂;⑥安山-旧寺墩深大断裂;⑦阿尔金-恩格尔乌苏深大断裂;⑧龙首山断裂;⑨查干础鲁断裂带;⑩吉兰泰断裂带;I.西伯利亚板块;II.哈萨克斯坦板块;III.塔里木板块;IV.华北板块;V.柴达木-祁连板块

      Fig.  1.  Tectonic and geological sketch map of the Beishan area, Gansu and Inner Mongolia

      图  2  研究区地质简图

      Fig.  2.  Geological map of the study area

      图  3  北山地区研究剖面地层综合柱状图

      Fig.  3.  Generalized composite stratigraphical sections for the measured geological profiles in Beishan area

      图  4  流纹英安岩(a)和含砂亮晶泥晶生屑灰岩(b)

      Fig.  4.  Rhyodacite(a) and sand-bearing sparry micrite bioclastic limestone (b)

      a, b.(+)10×2

      图  5  后红泉剖面同位素样品锆石CL图像

      图中红色圈为U-Pb年龄测点

      Fig.  5.  The zircon CL images for the samples from Houhongquan profiles

      图  6  锆石U-Pb年龄谐和图和206Pb/238U年龄权重分布图

      Fig.  6.  Concordia diagrams of zircon U-Pb and zircon 206Pb/238U weighted mean ages

      a.XWG8;b.XWG12

      图  7  后红泉火山岩样品SiO2-(Na2O+K2O)图解(a)、Nb/Y-Zr/TiO2判别图解(b)、SiO2-K2O图解(c)和SiO2-FeO*/MgO图解(d)

      a.底图据Bas et al.(1986);b.据Winchester and Floyd(1977);c.底图据Hastie et al. (2007);d. Miyashiro(1974);Le Maitre蓝色线,Rickwood总结了Peccerillo and Taylor(1976)Ewart(1982)Innocenti et al.(1982)Carr(1985)Middlemost(1985)的分类界线,以绿色阴影条带表示

      Fig.  7.  SiO2-(Na2O+K2O)(a), Nb/Y-Zr/TiO2(b), SiO2-K2O(c), SiO2-FeO*/MgO(d) diagrams for the volcanic samples from Houhongquan profiles

      图  8  后红泉玄武岩样品稀土元素球粒陨石标准化分布型式图(a)和微量元素原始地幔标准化蛛网图(b)

      标准化值据Sun and Mcdonough (1989)Taylor and McDonough(1985),OIB、N-MORB、E-MORB及弧亚碱性玄武岩的分配样式参考Xia and Li (2019)

      Fig.  8.  Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spider diagram (b) for the basalts from Houhongquan area

      图  9  后红泉地区二叠纪玄武岩样品微量元素比值及同位素图解

      a. La/Yb-La图解(据Baker et al., 1997);b. Y/Nb-Zr/Nb图解(据Wilson,1989);c.SiO2Nd(t) 图解;d.SiO2-(87Sr/86Sr)i图解;e. Nb/U-Nb/Th图解;f. Nb/Th-Th/U图解(据Pearce and Peate, 1995).PM.地幔柱;CC.大陆壳;OIB.洋岛玄武岩;IAB.岛弧玄武岩;N-MORB.正常洋中脊

      Fig.  9.  Trace element ratio and isotope diagrams for the Permian basalts from Houhongquan area

      图  10  玄武岩Zr/Y-Zr (a)、Nb×2-Zr/4-Y (b)、Ti-V(c)判别图解和Sm/Yb-La/Sm图解(d)

      a. 据Pearce and Norry (1979);A.火山弧玄武岩;B.MORB;C.板内玄武岩;D.MORB和火山弧玄武岩;E.MORB和板内玄武岩;b. 据Meschede (1986);AⅠ.板内碱性玄武岩;AⅡ.板内玄武岩和板内拉斑玄武岩;B.E型MORB;C.板内拉斑玄武岩和火山弧玄武岩;D.N型MORB和火山弧玄武岩;c.据Shervais (1982)汇编;BABB.弧后盆地玄武岩;d.底图据Mahoney and Coffin(1997);PM. 原始地幔;DMM.亏损地幔;CLM.大陆岩石圈地幔;LC.下地壳;CC.整个地壳;UC.上地壳

      Fig.  10.  Zr/Y-Zr (a), Nb×2-Zr/4-Y (b), Ti-V (c) discrimination diagrams of basalts and Sm/Yb vs. La/Sm diagram (d)

      表  1  甘蒙北山地区二叠系划分及命名沿革表

      Table  1.   History of the stratigraphical subdivision and formations of the Permian strata in the Beishan area, Gansu and Inner Mongolia

      郭敬信(1964) 朱伟元和沈光隆(1977) 甘肃省地层表编写组(1983) 内蒙古自治区地质矿产局(1991) 李文国(1996) 杨雨等(1997) 张新虎等(2013)
      上二叠统 红柳峡群 上二叠统 方山口群 上二叠统 红岩井组 上二叠统 哈尔苏海群 上二叠统 哈尔苏海组 上二叠统 方山口组 上二叠统 红岩井组 方山口组
      红岩井组
      方山口组 金塔组
      下二叠统 梧桐沟组 金塔组 下二叠统 金塔组 中二叠统 方山口组 下二叠统 金塔组 下二叠统 双堡塘组 中二叠统 双堡塘组 双堡塘组 双堡塘组 金塔组
      双堡塘组 哲斯组 下二叠统 菊石滩组 双堡塘组 下二叠统 双堡塘组 双堡塘组 下二叠统 黄丘泉砂岩 红山井灰岩 双堡塘组
      双堡塘组
      下载: 导出CSV

      表  2  后红泉剖面样品锆石U-Pb测试结果

      Table  2.   Zircon U-Pb dating results of the samples from Houhongquan profiles

      测试编号 Pb(10-6) 232Th(10-6) 238U(10-6) 232Th/238U 同位素比值 同位素年龄(Ma)
      207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ
      XWG8含砂亮泥晶生屑灰岩
      1 5 52 89 0.58 0.056 4 0.004 1 0.335 9 0.024 2 0.043 2 0.000 8 478 167.57 294 18.36 273 5.10
      2 16 130 315 0.41 0.050 4 0.001 1 0.300 9 0.007 4 0.043 3 0.000 5 213 49.99 267 5.78 273 3.16
      3 13 94 253 0.37 0.055 1 0.001 3 0.331 6 0.009 6 0.043 5 0.000 6 417 56.48 291 7.29 275 3.76
      4 17 197 318 0.62 0.052 7 0.000 9 0.317 5 0.006 1 0.043 8 0.000 5 322 40.74 280 4.67 276 3.30
      5 17 157 332 0.47 0.051 8 0.001 1 0.313 9 0.008 1 0.043 8 0.000 5 280 50.00 277 6.23 277 3.33
      6 41 447 758 0.59 0.051 9 0.000 6 0.312 0 0.005 2 0.043 6 0.000 5 283 27.78 276 3.99 275 3.16
      7 40 366 759 0.48 0.053 0 0.001 1 0.317 2 0.008 3 0.043 3 0.000 4 328 48.15 280 6.42 274 2.68
      8 15 115 292 0.39 0.051 6 0.001 1 0.312 9 0.006 7 0.044 1 0.000 4 265 52.77 276 5.16 278 2.65
      9 38 376 701 0.54 0.052 1 0.000 7 0.315 4 0.005 0 0.044 0 0.000 6 287 33.33 278 3.88 278 3.53
      10 22 308 377 0.82 0.051 0 0.000 8 0.309 0 0.005 6 0.044 0 0.000 5 239 32.40 273 4.33 278 3.08
      11 8 136 143 0.95 0.049 7 0.001 9 0.298 3 0.011 6 0.043 6 0.000 5 189 116.65 265 9.10 275 3.03
      12 9 62 176 0.35 0.052 2 0.001 8 0.310 7 0.010 1 0.043 3 0.000 5 295 79.62 275 7.80 273 3.28
      13 31 423 547 0.77 0.052 2 0.000 8 0.319 8 0.004 9 0.044 5 0.000 6 295 35.18 282 3.79 281 3.48
      14 41 390 771 0.51 0.051 8 0.000 6 0.315 2 0.004 4 0.044 2 0.000 5 276 23.15 278 3.43 279 3.12
      15 15 127 302 0.42 0.053 4 0.001 1 0.321 6 0.007 6 0.043 6 0.000 5 346 44.44 283 5.82 275 2.95
      16 8 51 159 0.32 0.050 6 0.001 4 0.310 2 0.009 9 0.044 3 0.000 6 233 60.18 274 7.66 280 3.97
      17 11 87 216 0.40 0.049 8 0.001 0 0.303 4 0.007 0 0.044 2 0.000 5 183 15.74 269 5.45 279 3.24
      18 12 171 206 0.83 0.057 0 0.003 1 0.336 6 0.017 1 0.043 0 0.000 5 500 120.35 295 13.00 271 3.30
      19 22 247 418 0.59 0.054 9 0.001 0 0.330 1 0.006 7 0.043 7 0.000 6 409 43.52 290 5.09 276 3.92
      20 14 121 288 0.42 0.051 5 0.001 0 0.306 5 0.007 5 0.043 1 0.000 5 265 46.29 271 5.81 272 3.39
      XWG12流纹英安岩
      1 17 238 298 0.80 0.055 8 0.001 7 0.333 9 0.010 6 0.043 4 0.000 4 443 66.66 293 8.06 274 2.66
      2 13 178 239 0.74 0.054 0 0.001 5 0.322 0 0.008 8 0.043 5 0.000 6 372 64.81 283 6.72 274 3.46
      3 12 129 212 0.61 0.048 1 0.007 4 0.287 7 0.046 2 0.043 2 0.000 5 106 325.89 257 36.43 273 2.79
      4 25 336 449 0.75 0.050 7 0.001 6 0.302 2 0.009 7 0.043 3 0.000 5 228 72.21 268 7.55 273 3.24
      5 38 437 708 0.62 0.052 3 0.001 2 0.309 8 0.009 8 0.042 8 0.000 5 298 53.70 274 7.62 270 3.00
      6 13 124 236 0.53 0.056 2 0.002 7 0.333 9 0.017 0 0.043 0 0.000 4 457 105.55 293 12.97 271 2.74
      7 15 187 274 0.68 0.052 6 0.001 6 0.315 6 0.010 0 0.043 5 0.000 4 309 66.66 279 7.71 274 2.76
      8 32 504 545 0.92 0.052 6 0.000 9 0.312 7 0.007 0 0.043 1 0.000 7 309 38.89 276 5.40 272 4.18
      9 25 343 433 0.79 0.053 9 0.002 4 0.323 0 0.018 6 0.043 3 0.000 7 369 99.99 284 14.29 273 4.32
      10 18 258 325 0.79 0.050 8 0.001 9 0.302 0 0.010 7 0.043 2 0.000 5 232 87.02 268 8.31 273 2.95
      11 11 122 193 0.63 0.050 6 0.004 4 0.299 4 0.026 2 0.042 9 0.000 8 220 199.98 266 20.51 271 5.10
      12 17 233 304 0.77 0.053 7 0.001 7 0.318 3 0.010 8 0.043 0 0.000 5 367 72.22 281 8.31 271 3.37
      13 22 290 376 0.77 0.058 3 0.001 0 0.351 3 0.011 0 0.043 6 0.001 1 539 43.51 306 8.27 275 6.61
      14 29 423 501 0.84 0.055 3 0.001 3 0.328 4 0.006 8 0.043 2 0.000 5 433 51.85 288 5.22 273 3.38
      下载: 导出CSV

      表  3  后红泉地区二叠纪玄武岩主量(%)及微量(10-6)元素结果

      Table  3.   Major (%) and trace element (10-6) data of the Permian basalts from Houhongquan area

      样品 XWG XWG XWG XWG XWG XWG XWG XWG XWG XWG XWG 许伟等(2019)
      编号 9 10 22 23 24 35 36 38 42 43 45
      岩性 杏仁状(安山)玄武岩 杏仁状(安山)玄武岩 杏仁状安山岩 杏仁状玄武岩 杏仁状玄武岩 杏仁状粒玄岩 杏仁状玄武岩 杏仁状玄武岩 杏仁状玄武岩 杏仁状玄武岩 杏仁状玄武岩 16HHQ-H5 16HHQ-H11 16HHQ-H13 16HHQ-H17 16HHQ-H18
      名称 玄武岩 玄武岩 玄武岩 玄武岩 玄武岩
      主量元素
      SiO2 47.76 49.46 50.66 49.78 53.12 48.70 50.08 50.28 49.80 47.48 53.10 48.6 48.72 47.5 54.56 51.04
      Al2O3 15.36 14.12 17.84 16.30 16.75 15.15 13.78 15.63 17.01 16.89 15.57 14.7 15.56 15.69 13.91 12.98
      Fe2O3 3.45 2.00 2.61 2.64 2.36 4.71 4.13 2.49 4.24 3.37 3.92 3.85 2.91 2.86 5.88 4.25
      FeO 4.98 6.65 6.63 7.01 5.82 6.42 7.15 6.77 6.01 6.50 5.15 6.6 5.76 6.24 2.74 3.61
      TiO2 1.41 1.82 1.58 1.78 1.17 1.85 2.39 1.71 2.07 2.06 1.40 1.86 1.75 1.84 1.4 1.32
      K2O 0.01 0.01 0.82 0.97 0.93 0.36 0.73 0.18 1.19 0.43 0.24 0.35 0.4 0.44 0.1 0.18
      Na2O 2.76 4.37 3.30 3.27 3.64 3.27 3.62 2.99 3.85 3.14 3.34 3.56 2.61 3.58 3.12 3.43
      CaO 12.21 10.18 7.09 6.81 6.89 7.84 9.12 8.36 7.47 7.91 8.20 10.9 10.95 9.72 9.38 10.76
      MgO 5.62 4.96 5.60 7.06 5.50 8.36 5.75 7.76 6.13 7.56 5.95 5.12 7.08 7 3.57 4.77
      MnO 0.17 0.16 0.16 0.14 0.13 0.20 0.21 0.15 0.18 0.21 0.16 0.14 0.2 0.18 0.1 0.11
      P2O5 0.20 0.36 0.29 0.34 0.30 0.22 0.29 0.20 0.30 0.31 0.21 0.28 0.3 0.52 0.32 0.29
      LOI 5.48 4.45 3.57 3.86 3.44 3.10 3.08 3.48 2.35 4.29 3.76 3.74 3.45 4.16 4.65 6.94
      CO2 5.38 4.77 0.46 0.20 0.62 0.28 1.21 0.23 0.14 0.92 0.97 - - - - -
      σ 1.61 2.97 2.22 2.65 2.06 2.31 2.67 1.38 3.74 2.84 1.27 2.73 1.58 3.59 0.9 1.62
      SI 33.41 27.57 29.54 33.70 30.14 36.16 26.89 38.43 28.62 36.00 31.99 26.28 37.74 34.79 23.17 29.37
      Mg# 0.55 0.51 0.53 0.57 0.55 0.58 0.49 0.61 0.53 0.59 0.55 0.5 0.63 0.61 0.47 0.56
      稀土元素
      La 8.72 15.05 13.19 15.29 18.89 9.42 9.61 7.65 12.54 11.65 9.06 15.2 9.95 24.2 13.7 12.4
      Ce 21.72 36.50 29.87 44.53 50.63 28.13 26.66 21.08 39.75 37.91 22.37 36.6 27.3 65.6 33.1 30.6
      Pr 3.64 5.51 4.60 6.01 6.31 4.65 4.40 3.51 5.37 4.96 4.00 5.06 4.08 9.35 4.68 4.25
      Nd 16.40 23.66 19.80 25.36 28.21 20.43 20.79 15.77 24.45 22.15 19.13 22.2 18.6 40 20.5 19
      Sm 4.22 5.58 4.82 5.87 6.41 5.51 5.73 4.93 6.20 6.44 4.39 5.88 4.94 8.94 5.2 4.85
      Eu 1.53 1.91 2.07 2.06 1.77 1.87 2.06 1.59 1.97 1.98 1.52 1.87 1.74 2.54 1.56 1.49
      Gd 4.55 5.6 5.74 7.43 6.53 6.83 6.81 5.35 7.34 6.28 4.63 6.28 5.18 7.76 5.32 4.97
      Tb 0.89 1.04 0.82 1.11 1.06 1.27 1.16 0.93 1.07 1.02 0.81 1.04 0.86 1.13 0.92 0.84
      Dy 4.25 5.32 5.29 6.64 6.25 7.87 8.07 6.46 6.41 6.51 5.74 6.58 5.42 6.23 5.88 5.4
      Ho 1.14 1.24 1.11 1.35 1.22 1.66 1.62 1.36 1.50 1.34 1.13 1.42 1.17 1.18 1.2 1.13
      Er 3.45 3.57 3.38 4.08 3.79 4.8 4.65 4.12 4.21 4.28 3.28 3.96 3.1 3.02 3.29 3.1
      Tm 0.51 0.57 0.51 0.67 0.63 0.79 0.69 0.58 0.69 0.70 0.51 0.59 0.47 0.44 0.5 0.47
      Yb 3.35 3.59 3.26 4.02 4.19 4.81 4.65 3.97 4.30 4.30 3.29 3.8 3 2.8 3.21 3.07
      Lu 0.53 0.59 0.55 0.69 0.67 0.74 0.77 0.70 0.74 0.70 0.59 0.58 0.45 0.42 0.48 0.46
      ΣREE 74.90 109.73 95.01 125.11 136.57 98.77 97.67 78.00 116.54 110.23 80.44 111.06 86.26 173.61 99.54 92.03
      LREE 56.23 88.21 74.35 99.12 112.22 70.00 69.24 54.53 90.27 85.11 60.46 86.81 66.61 150.63 78.74 72.59
      HREE 18.67 21.52 20.66 25.99 24.35 28.77 28.43 23.47 26.27 25.12 19.98 24.25 19.65 22.98 20.8 19.44
      LREE/HREE 3.01 4.10 3.60 3.81 4.61 2.43 2.44 2.32 3.44 3.39 3.03 3.58 3.39 6.55 3.79 3.73
      δEu 1.06 1.03 1.20 0.95 0.83 0.93 1.01 0.94 0.89 0.94 1.02 0.94 1.05 0.93 0.91 0.93
      δCe 0.93 0.96 0.92 1.12 1.11 1.02 0.98 0.98 1.16 1.20 0.89 1 1.03 1.05 0.99 1.01
      (La/Yb)N 1.75 2.83 2.73 2.56 3.04 1.32 1.39 1.30 1.97 1.83 1.86 2.87 2.38 6.2 3.06 2.9
      (La/Sm)N 1.30 1.70 1.72 1.64 1.85 1.08 1.05 0.98 1.27 1.14 1.30 1.63 1.27 1.7 1.66 1.61
      微量元素
      Sr 379 207 472 401 375 206 237 184 496 226 212 184 445 546 290 285
      Li 10.1 23.9 24.6 27.3 14.2 9.6 18.4 14.4 19.4 23.9 15.7 8.8 14.3 14.7 16 16.8
      Be 0.75 1.22 1.27 1.38 1.26 1.10 1.21 0.89 1.58 1.39 0.85 - - - - -
      V 97.8 98.2 220.2 211.5 161.7 298.4 354.1 258.4 252.1 246.5 245.6 350 290 265 242 233
      Cr 144.1 93.75 78.64 123.3 105.0 250.5 174.2 236.3 150.8 166.3 146.7 93.2 272 246 146 148
      Ga 11.1 12.50 21.00 20.22 20.02 19.92 18.38 19.08 21.44 19.76 17.33 21.9 17.2 18 13.5 14.1
      Co 32.42 28.29 29.31 30.46 27.90 40.79 41.87 39.93 34.65 36.70 31.25 35.3 38 35.3 25.3 27.1
      Ni 52.14 38.49 25.54 43.63 38.87 49.26 40.65 54.69 50.21 63.48 37.48 26.7 68.8 60.6 51.2 51.2
      Ba 36 56 159 209 229 63 107 36 154 96 49 78 74 195 24 46
      Sc 26.25 22.00 29.83 30.54 25.78 46.59 42.92 40.87 35.78 34.30 38.61 25.7 24.4 24.5 23.2 20.3
      Rb 4.39 3.39 38.03 52.70 44.76 19.68 71.68 6.20 38.56 5.30 4.34 21.2 11.8 9.53 3.64 4.57
      Hf 3.10 4.80 4.78 6.64 6.10 4.55 4.97 4.26 6.20 4.78 3.41 4.5 3.81 5.82 4.38 4.18
      Zr 149 222 179 238 229 171 197 156 276 229 149 167 151 266 173 161
      Nb 4.5 11.0 11.6 13.4 15.0 6.8 6.5 5.9 15.1 6.6 6.0 6.9 5.6 5.7 6.5 6
      Cs 0.27 0.31 0.43 0.44 0.52 0.29 0.51 0.33 1.84 0.92 0.43 0.41 0.44 0.18 0.18 0.28
      Cd 0.21 0.27 0.23 0.23 0.25 0.18 0.23 0.19 0.22 0.31 0.19 - - - - -
      Th 0.97 1.37 1.28 1.34 2.20 0.96 1.01 0.86 0.90 0.88 1.01 1.07 0.45 1.44 1.47 1.3
      U 0.72 0.58 0.53 0.68 0.80 0.43 0.74 0.37 0.54 0.49 0.46 0.31 0.28 0.66 0.56 0.3
      Ta 0.28 1.04 0.71 0.96 0.92 0.67 0.53 0.60 1.01 0.53 0.55 0.56 0.45 0.48 0.53 0.5
      W 0.24 0.33 0.33 0.44 0.42 0.31 0.28 0.28 0.26 0.32 0.28 - - - - -
      Pb 1.2 1.3 5.2 6.3 7.5 2.8 4.4 3.6 6.2 3.2 5.4 5.9 2.9 3.3 5.7 4.1
      Bi 0.06 0.10 0.28 0.26 0.28 0.14 0.13 0.10 0.08 0.10 0.22 - - - - -
      Y 25.5 30.5 30.4 45.8 48.5 55.2 57.9 46.5 49.8 49.6 31.9 33 26.1 27.2 29 26.3
      下载: 导出CSV

      表  4  后红泉剖面火山岩样品Sr-Nd同位素分析结果

      Table  4.   Sr-Nd isotopic compositions of the volcanic sample from Houhongquan profiles

      样品号 Rb(10-6) Sr(10-6) 87Rb/86Sr 87Sr/86Sr ±2σ (87Sr/86Sr)i Sm(10-6) Nd(10-6) 147Sm/144Nd 143Nd/144Nd ±2σ εNd(t) 数据来源
      XWG9 4.39 379 0.033 5 0.705 57 0.000 02 0.705 44 4.22 16.40 0.156 6 0.512 778 0.000 008 4.13 本研究
      XWG10 3.39 207 0.047 4 0.705 58 0.000 02 0.705 39 5.58 23.66 0.143 5 0.512 784 0.000 008 4.70
      XWG22 38.03 472 0.233 1 0.707 33 0.000 01 0.706 43 4.82 19.80 0.148 2 0.512 521 0.000 010 -0.59
      XWG23 52.70 401 0.380 2 0.705 18 0.000 02 0.703 71 5.87 25.36 0.140 9 0.512 787 0.000 012 4.86
      XWG24 44.76 375 0.345 7 0.707 78 0.000 01 0.706 43 6.41 28.21 0.138 3 0.512 491 0.000 009 -0.83
      XWG35 19.68 206 0.276 4 0.704 59 0.000 02 0.703 51 5.51 20.43 0.164 2 0.512 915 0.000 008 6.54
      XWG36 71.68 237 0.875 3 0.705 42 0.000 01 0.702 02 5.73 20.79 0.167 7 0.512 593 0.000 064 0.13
      XWG38 6.20 184 0.097 7 0.704 91 0.000 02 0.704 53 4.93 15.77 0.190 3 0.512 961 0.000 007 6.53
      XWG42 38.56 496 0.225 2 0.706 55 0.000 02 0.705 68 6.20 24.45 0.154 3 0.512 888 0.000 009 6.36
      XWG43 5.30 226 0.067 9 0.704 62 0.000 02 0.704 36 6.44 22.15 0.177 0 0.512 890 0.000 013 5.61
      XWG45 4.34 212 0.059 2 0.705 41 0.000 02 0.705 18 4.39 19.13 0.139 7 0.512 743 0.000 009 4.04
      16HHQ-H11 11.8 445 0.076 7 0.705 96 0.000 01 0.705 85 4.9 18.6 0.160 3 0.512 886 0.000 009 6.2 许伟等(2019)
      16HHQ-H13 9.5 546 0.050 5 0.706 17 0.000 01 0.706 28 5.2 40.5 0.078 1 0.512 922 0.000 002 10
      16HHQ-H18 4.6 285 0.043 2 0.706 49 0.000 01 0.706 31 4.9 19 0.157 0 0.512 697 0.000 004 2.7
      16HHQ-H5 21.2 184 0.333 1 0.708 66 0.000 01 0.707 29 5.9 22.2 0.161 8 0.512 629 0.000 003 1.2
      注:计算参数为(87Sr/86Sr)i=(87Sr/86Sr)S-(87Rb/86Sr)S×(eλt-1);λ=1.42×10-11/a; ε(Sr)=[(143Nd/144Nd)S/(143Nd/144Nd)CHUR-1]×10 000; ε(Nd)=[(143Nd/144Nd)S/(143Nd/144Nd)CHUR-1]×10 000;t代表样品形成时间; (147Sm/144Nd)CHUR=0.196 7;(143Nd/144Nd)CHUR=0.512 638.
      下载: 导出CSV
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    出版历程
    • 收稿日期:  2020-12-29
    • 网络出版日期:  2021-12-04
    • 刊出日期:  2021-11-30

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