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    华北克拉通北缘早二叠世堆晶岩及其构造意义

    邵济安 田伟 张吉衡

    邵济安, 田伟, 张吉衡, 2015. 华北克拉通北缘早二叠世堆晶岩及其构造意义. 地球科学, 40(9): 1441-1457. doi: 10.3799/dqkx.2015.131
    引用本文: 邵济安, 田伟, 张吉衡, 2015. 华北克拉通北缘早二叠世堆晶岩及其构造意义. 地球科学, 40(9): 1441-1457. doi: 10.3799/dqkx.2015.131
    Shao Ji'an, Tian Wei, Zhang Jiheng, 2015. Early Permian Cumulates in Northern Margin of North China Craton and Their Tectonic Significances. Earth Science, 40(9): 1441-1457. doi: 10.3799/dqkx.2015.131
    Citation: Shao Ji'an, Tian Wei, Zhang Jiheng, 2015. Early Permian Cumulates in Northern Margin of North China Craton and Their Tectonic Significances. Earth Science, 40(9): 1441-1457. doi: 10.3799/dqkx.2015.131

    华北克拉通北缘早二叠世堆晶岩及其构造意义

    doi: 10.3799/dqkx.2015.131
    基金项目: 

    国家自然科学基金项目 41172196

    详细信息
      作者简介:

      邵济安(1940-), 女, 教授, 主要从事构造地质专业研究工作.E-mail: wangcc@tsinghua.edu.cn

    • 中图分类号: P581

    Early Permian Cumulates in Northern Margin of North China Craton and Their Tectonic Significances

    • 摘要: 目前对华北克拉通北缘早二叠世基性-超基性岩成因有不同认识, 其中, 一种流行的观点是它们与"安第斯型大陆边缘"的活动有关.通过对冀东地区堆晶岩的研究对这一观点进行了讨论.华北克拉通北缘断续分布了受丰宁-隆化岩石圈断裂控制的早二叠世基性-超基性堆晶岩, 堆晶岩的SHRIMP锆石U-Pb年龄为280~300 Ma.通过岩相学的研究, 确认这是一套由纯橄岩、橄辉岩、辉石岩、角闪岩、辉长岩、闪长岩、斜长岩等不同岩性组成的堆晶岩, 进一步可分为层状堆晶岩和环状堆晶岩, 它们有着明显的堆晶结构.矿物学研究显示堆晶岩中角闪石、辉石、金云母等均具有高镁、高铬的幔源组分特征.不同组分堆晶岩的Sr/Ba比值不随熔融程度变化, 具有分离结晶的趋势.相近的稀土配分形式和过渡族元素组成显示了它们的同源性.从本区晚古生代和早中生代堆晶岩的对比中, 结果表明早二叠世这期堆晶岩具有初始裂谷岩浆的特征, 它传递了华北克拉通陆壳从稳定向活动转化的最早信息.从区域角度看, 这期活动有着更大范围的深部动力学背景.

       

    • 图  1  早二叠世华北克拉通北缘及其邻区构造岩浆带分布

      1.华北克拉通北缘约280 Ma基性-超基性岩带;2.中亚造山带晚古生代-造山带碱性或碱性花岗岩及双峰火山岩带;3.天山-准格尔-塔里木板块北缘石炭纪-二叠纪裂谷火山岩带;4.塔里木板块约280 Ma的大陆溢流玄武岩;5.克拉通

      Fig.  1.  Distribution of Early Permian tectonomagmatic belt of northern margin of North China Craton and adjacent areas

      图  2  研究区早二叠世堆晶岩分布的地质简图

      a.高寺台环状杂岩体简图,引自Chen et al.(2009);b.区域构造格架;c.研究区;1.太古界;2.中晚元古界;3.不同时代花岗岩;4.中生界;5.超基性-基性杂岩;6.新太古代变质基底出露区;7.中、新元古代燕辽沉降带;8.古生代兴蒙造山带;9.黑色点线代表华北克拉通与兴蒙造山带分界线,黑或红色虚线或实线为断裂或推测断裂;10.左为研究区显生宙麻粒岩发现地点,右为本文研究区;A.丰宁-隆化-黑里河-北票断裂;B.赤城-承德-建平断裂带

      Fig.  2.  Geological sketch of distributing of Early Permian cumulates in research area

      图  3  堆晶岩SHRIMP锆石U-Pb年龄

      Fig.  3.  SHRIMP zircon U-Pb dating of the cumulates

      图  4  堆晶岩构造

      a.堆晶岩层状构造;b.堆晶斜层理;c.堆晶岩中残留的通道相;d.球状斜长石中的放射状角闪石;e.球状斜长岩的韵律环带;f.巨晶角闪石;g.巨晶辉石

      Fig.  4.  The structure of cumulate

      图  5  堆晶岩的显微摄影

      a.闪长岩的定向组构;b.巨晶角闪石及其边缘锯齿状镶嵌结构;c.填隙的晚期粒状辉石;d.斜长岩的包含结构及捕获的早期辉石岩;e.反应边结构;f.矿物的环带结构和反应边结构;g.尖晶石橄辉岩;h.金云母和镁角闪石的镶嵌结构;Ol.橄榄石;Cpx.单斜辉石;Hbl.角闪石;Mg-Hbl.镁角闪石;Sp.尖晶石;Phl.金云母;Pl.斜长石

      Fig.  5.  The photomicrography of cumulates

      图  6  堆晶岩的R1-R2

      de La Roche et al.(1980)

      Fig.  6.  The R1-R2 diagram

      图  7  堆晶岩的S-B图解

      Onuma(1981)

      Fig.  7.  The S-B diagram of cumulates

      图  8  堆晶岩的稀土元素球粒陨石标准化配分图(a)和微量元素原始地幔标准化的蛛网图(b)

      G11.纯橄岩;YSD-2.纯橄岩;BJ6.橄辉岩;G4.含铁透辉岩;R12.辉石岩;R8.角闪辉石岩;R21.辉石角闪岩;R36.辉石角闪岩;R16.辉石角闪岩;R1.角闪岩;R37.辉长岩;R33.角闪辉长岩;R20.辉长岩;R4.辉绿岩;R24.斜长岩;R30.闪长岩

      Fig.  8.  Chondrite-normalized REE patterns (a) and primitive mantle-normalized spidegrams (b) of cumulates

      图  9  堆晶岩的过渡族元素原始地幔标准化图

      Fig.  9.  Primitive mantle-normalized transition group elements diagram of cumulates

      图  10  华北克拉通北缘早二叠世和晚三叠世堆晶岩和深成岩的εNd(t)-(87Sr/86Sr)i图解

      Fig.  10.  εNd(t)-(87Sr/86Sr)i diagram of cumulates and plutonic rocks of the Early Permian and Late Triassic in the northern margin of North China Craton

      表  1  华北克拉通北缘堆晶岩同位素年龄

      Table  1.   The isotopic dating of zircon of cumulates in the northern margin of North China Craton

      样品采集地 岩性及样号 方法 年龄(Ma) 出处
      丰宁波罗诺 辉长-辉绿岩(R20) SHRIMP锆石U-Pb 284.5±2.5 本文
      丰宁八郎沟 角闪辉石岩(R33) SHRIMP锆石U-Pb 280.8±2.4 本文
      丰宁波罗诺 斜长岩(R26) SHRIMP锆石U-Pb 286.5±2.1 本文
      滦平石人沟 闪长岩(R17) SHRIMP锆石U-Pb 286.1±2.7 本文
      丰宁八郎沟 闪长岩(R30) SHRIMP锆石U-Pb 283.8±2.2 本文
      丰宁波罗诺 闪长岩(R28) SHRIMP锆石U-Pb 298.3±2.4 本文
      滦平北李营 石英斜长岩(R11) SHRIMP锆石U-Pb 300.7±2.6 本文
      承德高寺台 辉长岩墙 SHRIMP锆石U-Pb 280 Chen et al., 2009
      滦平北李营 球状闪长岩 单颗粒锆石SIMS 284 马芳等,2002
      丰宁波罗诺 石英闪长岩 SHRIMP锆石U-Pb 296 马旭等,2012
      丰宁镶黄旗 角闪辉长岩 全岩LA-ICP-MS 276 Zhang et al., 2009
      北京怀柔喇叭沟门 辉长闪长岩 SHRIMP锆石U-Pb 288 王惠初等,2007
      内蒙古固阳 辉长-闪长-花岗闪长岩 锆石U-Pb 286~279 Zhang et al., 2011
      角闪石 40Ar/39Ar 275
      内蒙乌拉特后旗额布图 辉石岩,橄辉岩 锆石SHRIMP 294 彭润民等,2012
      下载: 导出CSV

      表  2  角闪石的电子探针分析结果(%)

      Table  2.   The EMOA results of hornblendes (%)

      RP8-1.1 RP8-2.1 RP8-3.4 RP8-4.1 RP8-4.3 RP1-1.1 RP1-1.2 RP1-1.5 RP1-2.3 RP1-2.5 RP6-1.4 RP6-2.2 RP6-2.3 Q131-6 Q112-4 Q112-6 RP10-1
      所在岩石 斜长角闪岩 斜长角闪岩 斜长角闪岩 斜长角闪岩 斜长角闪岩 粗粒闪长岩 粗粒闪长岩 粗粒闪长岩 粗粒闪长岩 粗粒闪长岩 球状斜长岩 球状斜长岩 球状斜长岩 柱状角闪石 细粒角闪石 细粒角闪石 寄主岩角闪石
      SiO2 46.19 42.87 43.69 42.17 43.74 46.35 44.44 44.26 43.68 44.71 43.99 43.50 44.18 44.74 43.25 43.93 43.32
      TiO2 0.87 2.17 1.89 2.12 1.73 1.37 1.54 1.24 1.50 1.24 1.44 1.38 1.61 1.16 1.07 0.74 0.77
      Al2O3 11.45 13.29 11.73 13.34 12.15 8.94 10.28 10.27 10.53 10.37 9.86 11.04 9.93 11.24 11.57 10.06 8.87
      Cr2O3 0.02 0.02 0.02 0.07 0.10 0.01 0.00 0.01 0.50 0.05 0.00 0.04 0.06 0.00 0.01 0.00 0.07
      FeO 10.16 10.12 10.12 9.54 9.58 12.40 12.94 13.38 12.80 13.33 14.54 13.49 14.69 14.04 17.58 15.11 15.21
      MnO 0.20 0.19 0.171 0.16 0.17 0.33 0.35 0.27 0.38 0.37 0.39 0.23 0.33 0.33 0.40 0.39 0.46
      MgO 14.67 13.50 14.14 14.31 14.93 13.56 13.07 12.22 12.56 12.61 11.80 12.32 11.72 12.80 10.84 12.18 13.76
      CaO 11.76 12.10 11.60 11.99 11.92 11.72 11.49 11.97 11.34 11.68 12.53 12.64 12.35 11.88 11.91 12.08 12.49
      Na2O 2.00 2.01 2.01 2.08 2.12 1.25 1.95 1.66 1.89 1.87 1.16 1.24 1.19 0.84 0.79 0.70 1.40
      K2O 0.22 0.54 0.47 0.53 0.39 0.44 0.45 0.53 0.53 0.40 0.76 1.12 0.89 1.04 1.35 1.25 1.02
      Total 98.69 98.28 96.96 97.41 97.91 97.82 97.96 97.31 97.13 98.69 98.13 98.54 98.62 98.07 98.76 96.44 97.13
      Si 6.61 6.27 6.49 6.16 6.33 6.61 6.54 6.62 6.50 7.42 6.59 6.47 6.59 6.47 6.33 6.53 6.38
      Ti 0.09 0.24 0.21 0.23 0.19 0.09 0.17 0.14 0.17 0.16 0.16 0.16 0.18 0.13 0.12 0.09 0.09
      Al 1.93 2.29 2.03 2.30 2.07 1.93 1.78 1.81 1.85 0.27 1.74 1.74 1.75 1.92 1.99 1.76 1.54
      Cr 0.00 0.00 0.00 0.01 0.01 0.00 0.00 0.00 0.06 0.01 0.00 0.00 0.01 0.00 0.00 0.00 0.01
      Fe3+ 0.47 0.24 0.45 0.47 0.52 0.47 0.53 0.26 0.50 0.00 0.25 0.25 0.25 0.80 0.91 0.73 0.94
      Fe2+ 0.75 1.00 0.79 0.70 0.64 0.75 1.07 1.42 1.10 1.85 1.57 1.57 1.58 0.90 1.24 1.15 0.94
      Mn 0.02 0.02 0.02 0.02 0.02 0.02 0.04 0.03 0.05 0.05 0.05 0.05 0.04 0.04 0.05 0.05 0.06
      Mg 3.13 2.94 3.09 3.12 3.22 3.13 2.87 2.72 2.79 3.12 2.64 2.64 2.61 2.76 2.37 2.70 3.03
      Ca 1.80 1.90 1.82 1.88 1.85 1.80 1.81 1.92 1.81 2.08 2.01 2.01 1.97 1.84 1.87 1.92 1.98
      Na 0.56 0.57 0.57 0.59 0.60 0.56 0.56 0.48 0.55 0.60 0.34 0.34 0.35 0.24 0.22 0.20 0.40
      K 0.04 0.10 0.07 0.10 0.07 0.04 0.08 0.10 0.10 0.09 0.15 0.15 0.17 0.19 0.25 0.24 0.19
      Total 15.40 15.57 15.47 15.57 15.51 15.40 15.45 15.50 15.45 15.63 15.49 15.50 15.49 15.27 15.34 15.36 15.57
      Mg# 0.81 0.75 0.79 0.82 0.83 0.74 0.73 0.66 0.72 0.63 0.63 0.65 0.62 0.75 0.66 0.70 0.73
      Si 6.61 6.27 6.41 6.16 6.33 6.61 6.54 6.62 6.50 7.42 6.59 6.47 6.59 6.47 6.33 6.53 6.40
      命名 镁角闪 韭闪石 镁钙闪 镁绿钙 镁绿钙 镁角闪 镁角闪 镁角闪 镁角闪 浅闪石 镁角闪 镁钙闪 镁角闪 镁钙闪 镁钙闪 镁角闪 镁绿钙
      注:探针分析由北京大学造山带与地壳演化教育部重点实验室,操作者李小犁,仪器型号:JXA-8100;分析条件:加速电压15 kV;束流1×10-8 A;束斑2 μm;修正方法PRZ;标准样品美国SPI公司53种矿物.以下探针同此.RP10-1和Q的分析数据马芳等(2004).
      下载: 导出CSV

      表  3  单斜辉石的探针分析结果(%)

      Table  3.   The EMOA results of clinopyroxenes (%)

      样号 SiO2 TiO2 Al2O3 FeO MnO MgO CaO Na2O K2O Cr2O3 NiO Total Wo En Fs
      RP4.1 52.58 0.11 3.57 11.92 0.25 16.51 11.65 0.70 0.16 0.39 0.05 97.89 25.36 51.99 21.66
      RP4.2 52.21 0.21 3.74 12.35 0.22 16.48 12.09 0.61 0.27 0.32 0.07 98.56 26.94 51.10 21.95
      RP4.2+ 52.18 0.16 3.52 11.90 0.27 16.49 11.81 0.74 0.24 0.34 0.14 97.79 25.67 51.81 21.54
      RP4.3 52.58 0.08 3.76 12.07 0.24 16.68 11.98 0.82 0.16 0.37 0.04 98.79 25.72 51.77 21.50
      RP4.4 51.71 0.13 4.20 12.40 0.24 16.15 11.61 0.84 0.21 0.69 0.01 98.20 26.39 51.09 22.50
      RP4.5 51.21 0.16 4.35 12.42 0.35 16.35 11.69 0.94 0.23 0.58 0.05 98.32 26.33 51.24 22.43
      RP4.6 52.17 0.23 3.84 12.13 0.30 16.59 11.87 0.74 0.16 0.37 0.00 98.40 26.56 51.65 21.79
      下载: 导出CSV

      表  4  长石的探针分析结果(%)

      Table  4.   The EMOA results of feldspars (%)

      样号 RP1-2.2 RP1-2.4 RP8-1.4 RP8-1.5 RP8-2.3 RP6-1.1 RP6-1.2 RP6-1.3 RP6-1.3+ RP6-2.1 RP6-1.5 RP6-2.5
      SiO2 57.69 56.65 64.67 65.75 46.37 58.23 68.03 46.18 46.07 55.16 54.28 59.19
      Al2O3 26.41 27.31 22.82 21.98 31.95 25.96 20.19 35.04 36.09 28.32 28.62 25.04
      FeO 0.06 0.10 0.07 0.03 2.96 0.12 0.05 2.38 1.86 0.11 0.15 0.20
      CaO 8.26 9.06 3.82 2.96 0.03 7.53 0.59 0.02 0.06 10.30 11.00 7.56
      Na2O 7.47 6.98 9.66 10.14 0.31 7.13 11.79 0.17 0.23 6.25 5.69 7.79
      K2O 0.08 0.08 0.03 0.05 10.86 0.18 0.09 10.09 10.57 0.10 0.16 0.19
      An 37.76 41.58 17.90 13.85 0.22 36.48 2.67 0.16 0.43 47.39 51.18 34.55
      Ab 61.79 57.79 81.93 85.86 4.16 62.51 96.84 2.44 3.16 52.04 47.91 64.43
      Or 0.45 0.45 0.17 0.28 95.62 1.02 0.49 97.40 96.41 0.56 0.90 1.02
      命名 中长石 中长石 更长石 更长石 正长石 中长石 钠长石 正长石 正长石 中长石 拉长石 含钡中长
      下载: 导出CSV

      表  5  地幔包体和堆晶岩中金云母组分对比(%)

      Table  5.   Component comparison of phlogolite in mantle xenoliths and cumulates (%)

      金云母赋存状态 样号 SiO2 TiO2 Al2O3 MgO CaO MnO FeO Na2O K2O
      高寺台铬铁矿包体中富铬金云母 GST2-2.1 39.40 0.19 15.25 26.39 0.01 0.00 2.13 0.53 10.01
      GST1-3.2 39.26 0.26 15.23 25.80 0.02 0.00 1.40 0.46 9.84
      高寺台堆晶含橄辉石岩中金云母 G4-2.2 37.31 2.78 15.61 18.94 0.00 0.05 9.83 0.64 9.33
      G4-2.3 36.63 2.59 15.57 18.54 0.00 0.10 11.00 0.27 9.31
      注:探针分析仪器和方法同表 2.
      下载: 导出CSV

      表  6  堆晶岩主量元素分析结果(%)

      Table  6.   The analytical results of major elements of cumulates (%)

      编号 地点 岩性 SiO2 TiO2 Al2O3 TFe2O3 MnO MgO CaO Na2O K2O P2O5 LOI Total
      G11 高寺台 纯橄岩 34.81 0.01 0.07 7.88 0.12 43.81 0.16 0.00 0.01 0.01 13.27 100.15
      BJ6 高寺台 橄辉岩 44.20 0.04 0.61 13.66 0.10 40.46 0.91 0.01 0.04 0.01 10.71 100.00
      G4 高寺八家 含橄辉石岩 38.16 1.90 5.93 24.83 0.17 13.00 12.53 0.66 1.29 0.06 0.28 98.81
      RP-4 北李营 辉石岩 48.40 0.14 2.87 15.82 0.28 19.05 11.53 0.55 0.18 0.09 0.69 99.59
      R12 北李营 巨晶辉石岩 51.28 0.40 7.00 7.55 0.15 15.69 13.30 1.26 0.70 0.06 1.86 99.25
      R8 北李营 角闪辉石岩 49.78 1.33 5.75 16.34 0.28 12.07 11.90 0.82 0.42 0.41 0.76 99.87
      R21 波罗诺 辉石角闪岩 37.33 2.49 13.62 21.03 0.18 10.26 9.62 1.81 0.84 0.04 1.72 98.94
      R36 波罗诺 辉石角闪岩 42.11 1.26 15.63 11.25 0.13 12.51 11.65 2.47 0.32 0.02 1.68 99.03
      R16 石人沟 辉石角闪岩 45.08 1.39 12.86 11.79 0.15 13.03 10.58 2.03 0.68 0.04 1.54 99.17
      R1 北李营 含斜长石角闪岩 46.59 0.74 7.64 15.01 0.26 15.69 10.08 1.14 0.23 0.09 1.92 99.39
      RP-8 北李营 含斜长石角闪岩 47.83 0.87 9.45 10.35 0.16 16.64 10.51 1.89 0.61 0.12 1.24 99.66
      R37 团榆树 淡色辉长岩 49.71 0.69 19.88 9.27 0.13 5.25 9.71 3.76 0.19 0.05 0.34 98.99
      R33 八郎沟 角闪辉长岩 45.84 0.93 12.79 13.53 0.19 10.60 10.89 1.77 0.66 0.06 1.72 98.98
      R20 波罗诺 辉绿-辉长岩 47.57 0.91 19.64 11.44 0.21 3.27 8.28 4.47 1.02 0.68 1.34 98.83
      R30 八郎沟 闪长岩 43.87 1.67 19.18 13.91 0.23 4.18 9.88 2.67 1.22 0.94 1.26 99.01
      RP-1 北李营 粗粒闪长岩 49.62 0.80 16.71 10.12 0.17 6.58 9.43 3.81 0.75 0.45 1.26 99.69
      R4 北李营 辉绿岩 57.72 1.17 16.32 7.12 0.08 2.78 3.46 5.63 2.69 0.44 2.22 99.62
      Q238 北李营 辉长岩(捕) 49.00 0.81 15.37 10.41 0.24 8.89 10.69 2.49 0.78 0.25 0.27 99.80
      R24 波罗诺 斜长岩 53.27 0.32 20.39 4.64 0.08 1.89 9.74 5.55 0.54 0.34 2.70 99.46
      RP-16 石人沟 石英闪长岩 60.33 0.21 25.59 3.20 0.07 1.37 7.21 3.51 0.86 0.20 1.28 100.65
      RP-3 北李营 石英闪长岩 58.79 0.44 18.79 5.82 0.11 2.39 5.22 5.72 1.51 0.35 0.56 99.70
      RP-9 北李营 闪长质寄主岩 65.76 0.05 21.58 1.51 0.09 0.25 4.11 3.51 1.87 0.18 0.51 99.32
      注:Q238为球状斜长岩核部捕获的辉长岩;Q238和RP-9马芳等(2004);其余为中科院地质与地球物理研究所岩石圈演化国家重点实验室分析.
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      表  7  各类堆晶岩的微量元素(10-6)

      Table  7.   The trace elements in all kinds of cumulates (10-6)

      样品 G11 BJ6* G4 R12 R8 R36 R1 R37 R20 R30 R24 R21 R33 R16 R4
      La 0.023 0.226 2.55 4.98 11.6 3.06 6.43 3.86 34.1 28.8 21.1 6.17 7.27 5.40 30.3
      Ce 0.047 0.659 9.22 12.6 33.3 10.6 22.3 8.15 80.3 76.4 43.5 19.6 19.2 17.2 68.7
      Pr 0.003 1 0.115 1.67 1.90 5.38 2.08 3.99 1.16 10.7 10.9 5.16 3.55 3.03 3.11 8.54
      Nd 0.021 0.568 8.80 8.53 27.7 11.9 19.9 5.64 46.7 50.6 20.6 20.1 15.3 16.5 35.2
      Sm 0.003 2 0.186 2.41 2.11 7.27 3.61 5.02 1.35 9.49 11.2 3.70 5.90 3.93 4.54 6.49
      Eu 0.001 3 0.041 0.74 0.71 1.81 1.34 1.39 0.91 2.83 2.96 1.39 1.98 1.21 1.62 1.80
      Gd 0.006 9 0.158 2.21 1.92 7.12 3.78 4.22 1.28 7.64 9.74 2.85 6.00 3.75 4.55 4.57
      Tb 0.001 0 0.029 0.33 0.31 1.07 0.57 0.63 0.20 1.08 1.43 0.39 0.91 0.57 0.71 0.57
      Dy 0.006 2 0.129 1.80 1.95 6.26 3.31 3.62 1.22 5.78 7.88 2.09 5.07 3.32 4.10 2.75
      Ho 0.001 1 0.022 0.33 0.38 1.23 0.67 0.70 0.24 1.10 1.51 0.40 0.97 0.66 0.80 0.45
      Er 0.008 6 0.056 0.82 1.05 3.25 1.81 1.90 0.69 2.99 4.05 1.07 2.42 1.73 2.14 1.15
      Tm 0.001 1 0.007 0.10 0.14 0.44 0.25 0.26 0.095 0.43 0.55 0.16 0.33 0.23 0.30 0.15
      Yb 0.008 9 0.046 0.72 0.89 2.76 1.48 1.70 0.64 2.62 3.34 1.07 1.95 1.48 1.78 0.91
      Lu 0.002 0 0.008 0.10 0.15 0.43 0.21 0.27 0.095 0.39 0.49 0.16 0.27 0.21 0.24 0.12
      ∑REE 0.13 2.31 31.79 37.65 109.55 44.67 72.33 25.54 206.12 209.87 103.66 75.29 61.83 63.03 161.75
      Rb 0.074 0.41 27.6 7.00 0.82 0.74 0.47 1.23 16.5 24.1 7.52 6.19 8.24 5.52 36.3
      Ba 3.04 2.66 454 353 35.8 149 57.6 242 877 1 015 221 261 212 380 2 156
      Th 0.007 4 0.021 0.012 0.18 0.35 0.022 0.092 0.008 7 0.86 1.11 3.38 0.65 0.10 0.060 1.37
      U 0.003 7 0.008 0.002 5 0.075 0.11 0.014 0.050 0.006 2 0.21 0.35 0.69 0.15 0.066 0.037 0.45
      Nb 0.008 6 0.07 1.08 2.26 2.54 1.37 3.50 0.20 5.09 10.7 3.65 3.47 2.44 4.30 6.92
      Ta 0.002 5 0.001 0.049 0.085 0.11 0.056 0.12 0.010 0 0.16 0.42 0.21 0.16 0.090 0.15 0.33
      Pb 0.066 3.45 2.27 1.34 1.31 0.69 0.84 1.94 4.49 4.46 5.20 1.85 3.00 1.49 4.06
      Sr 2.46 2.66 153 282 100 763 98.5 1 395 1779 1 125 1 054 548 615 655 983
      Zr 0.17 1.11 16.1 23.0 81.6 21.3 36.7 6.29 53.6 70.1 75.1 34.3 39.5 34.0 159
      Y 0.044 0.707 8.30 10.2 33.1 18.0 18.4 6.51 31.9 41.2 11.7 25.1 17.1 21.0 13.0
      Sc 2.71 12.2 60.5 62.8 75.2 73.6 45.9 22.6 13.5 23.5 5.37 65.8 57.2 80.6 9.97
      V 5.07 19.91 851. 169 265 394 240 252 119 74.7 67.8 756 352 440 128
      Cr 3 462 1 453.2 40.6 1 234 28.8 251 1 496 32.5 1.25 3.40 21.1 2.20 88.8 353 21.3
      Co 117 103 93.3 49.8 63.8 52.0 70.6 29.5 17.3 25.1 10.5 73.7 52.2 57.4 18.0
      Ni 1 612 893.5 101 342 63.4 108 450 25.4 1.53 3.26 9.48 4.92 57.9 156 21.0
      注:测试者为武汉上谱分析科技有限责任公司史晓丽,各样号所对应的岩石名称见表 6,以上数据均为原始测试数据.
      下载: 导出CSV

      表  8  堆晶岩的Sm-Nd同位素组成

      Table  8.   Sm-Nd isotopic composition of cumulates

      样号 年龄 岩石 Sr(10-6) Nd(10-6) 87Rb/86Sr 87Sr/86Sr 2σ (87Sr/86Sr)i 147Sm/144Nd 143Nd/144Nd 2σ εNd(t)
      R12 284 巨晶辉石岩 277.10 8.710 0.076 2 0.705 215 15 0.704 91 0.140 6 0.511 828 12 -13.8
      R8 284 角闪辉石岩 99.47 29.450 0.032 8 0.705 250 13 0.705 12 0.154 4 0.511 879 13 -13.3
      R36 281 辉石角闪岩 748.50 13.490 0.075 7 0.705 569 15 0.705 27 0.179 1 0.511 859 14 -14.6
      R37 281 辉长岩 1 457.00 5.875 0.002 5 0.706 504 17 0.706 49 0.142 8 0.511 756 15 -15.3
      R20 284 辉绿岩 1 741.00 46.830 0.027 4 0.705 439 15 0.705 33 0.120 6 0.511 904 22 -11.6
      R24 286 斜长岩 1 001.00 19.650 0.021 2 0.705 406 13 0.705 32 0.107 4 0.511 901 13 -11.1
      注:测试者为中国科学院地质与地球物理研究所同位素室李潮峰,表中年龄为初始比值计算中的参考年龄.
      下载: 导出CSV
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    • 收稿日期:  2015-05-18
    • 刊出日期:  2015-09-15

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