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    华北克拉通南缘大庄铌-稀土矿床碱性岩中榍石的地球化学、U-Pb年龄和Nd同位素特征

    李志丹 李山坡 郭虎 曾威 崔玉荣 李效广 陈俊魁 张哨波

    李志丹, 李山坡, 郭虎, 曾威, 崔玉荣, 李效广, 陈俊魁, 张哨波, 2022. 华北克拉通南缘大庄铌-稀土矿床碱性岩中榍石的地球化学、U-Pb年龄和Nd同位素特征. 地球科学, 47(4): 1415-1434. doi: 10.3799/dqkx.2021.126
    引用本文: 李志丹, 李山坡, 郭虎, 曾威, 崔玉荣, 李效广, 陈俊魁, 张哨波, 2022. 华北克拉通南缘大庄铌-稀土矿床碱性岩中榍石的地球化学、U-Pb年龄和Nd同位素特征. 地球科学, 47(4): 1415-1434. doi: 10.3799/dqkx.2021.126
    Li Zhidan, Li Shanpo, Guo Hu, Zeng Wei, Cui Yurong, Li Xiaoguang, Chen Junkui, Zhang Shaobo, 2022. Geochemical, U-Pb Age and Nd-Isotopic Characteristics of Titanite in Alkaline Rocks from Dazhuang Nb-REE Deposit in Southern Margin of North China Craton. Earth Science, 47(4): 1415-1434. doi: 10.3799/dqkx.2021.126
    Citation: Li Zhidan, Li Shanpo, Guo Hu, Zeng Wei, Cui Yurong, Li Xiaoguang, Chen Junkui, Zhang Shaobo, 2022. Geochemical, U-Pb Age and Nd-Isotopic Characteristics of Titanite in Alkaline Rocks from Dazhuang Nb-REE Deposit in Southern Margin of North China Craton. Earth Science, 47(4): 1415-1434. doi: 10.3799/dqkx.2021.126

    华北克拉通南缘大庄铌-稀土矿床碱性岩中榍石的地球化学、U-Pb年龄和Nd同位素特征

    doi: 10.3799/dqkx.2021.126
    基金项目: 

    河南省自然资源科研项目 豫财招标采购-2020-165-3

    中国地质调查局项目 DD20211191

    中国地质调查局项目 DD20200148

    中国地质调查局项目 DD20221686

    中国地质调查局项目 DD20190119

    中国地质调查局项目 DD20221871

    国家自然科学基金项目 41502082

    详细信息
      作者简介:

      李志丹(1986—),男,博士研究生,高级工程师,从事矿床学研究工作.ORCID:0000-0002-3011-6392. E-mail:cugcug@qq.com

    • 中图分类号: P618.7

    Geochemical, U-Pb Age and Nd-Isotopic Characteristics of Titanite in Alkaline Rocks from Dazhuang Nb-REE Deposit in Southern Margin of North China Craton

    • 摘要: 位于华北克拉通南缘河南省方城县的大庄铌-稀土矿是近年来新发现的一例具有中型规模的铌-稀土矿床.该矿床赋存于新元古代双山碱性侵入岩中,黑云母正长岩和角闪霞石正长岩是铌-稀土矿的主要赋矿岩石.通过电子探针与LA-ICP-MS等方法对大庄铌-稀土矿碱性岩中的榍石开展了主量、微量元素、U-Pb年代学和微区Nd同位素研究.大庄铌-稀土矿碱性岩中榍石的SiO2(28.597%~31.169%)、CaO(25.492%~28.949%)、TiO2(34.126%~38.940%)平均含量明显低于理论值,含有相对较高的F(0.141%~1.086%)、Al2O3(1.573%~2.817%)和FeO(0.446%~2.147%).榍石具有极高的稀土元素总量(∑REE=781.47×10-6~31 766.59×10-6),球粒陨石标准化稀土配分曲线呈明显的右倾型,轻重稀土分馏明显,样品具有明显的负δEu异常(0.27~0.86)和不明显的δCe异常(0.97~1.22),Th/U值介于1.40~11.86,暗示大庄铌-稀土矿碱性岩中榍石为岩浆成因榍石,榍石Zr温度计获得大庄碱性岩的形成温度为667~964 ℃,平均为933 ℃.大庄铌-稀土矿碱性岩中的榍石具有极高的Nb和REE含量,表明榍石是大庄铌-稀土矿的重要成矿矿物,铌、稀土等元素是伴随岩浆演化逐步富集的结果.富铌榍石样品获得848±35 Ma、849±22 Ma、843±30 Ma、845±20 Ma、845±24 Ma和849±40 Ma的形成年龄,限定大庄铌-稀土矿化富集的时代为新元古代,与Rodinia超大陆裂解事件相关.榍石具有较为均一的Nd同位素值(εNdt)=-3.25~-0.66),表明方城地区霞石正长岩的原始岩浆形成于富金云母的地幔源区.

       

    • 图  1  方城县大庄铌-稀土矿大地构造图和区域地质图

      图a据Dong et al., 2011修改;图b据张哨波等,2020修改

      Fig.  1.  Simplified tectonic map and reginal geological map of Dazhuang Nb-REE deposit, Fangcheng County

      图  2  大庄铌-稀土矿区域地层序列

      Fig.  2.  Regional stratigraphic sequence of Dazhuang Nb-REE deposit

      图  3  方城县大庄铌-稀土矿区地质图(据李山坡等,2020修改)

      Fig.  3.  Geological map of the Dazhuang Nb-REE deposit in Fangcheng County (modified after Li et al., 2020)

      图  4  大庄铌-稀土矿床各类岩石野外照片

      a.黑云母正长岩;b.角闪霞石正长岩;c.黑云角闪正长岩;d.片麻状含磁铁矿黑云母正长岩

      Fig.  4.  Field photos of various rocks in the Dazhuang Nb-REE deposit

      图  5  大庄铌-稀土矿15线(a)和0线(b)勘探线剖面简图(据张哨波等,2020修改)

      Fig.  5.  No.15 (a) and No.0 (b) exploration line sections of the Dazhuang Nb-REE deposit (modified after Zhang et al., 2020)

      图  6  大庄铌-稀土矿碱性岩中榍石的显微特征

      Mc.微斜长石;Or.正长石;Ne.霞石;Ab.钠长石;Bt.黑云母;Ttn.榍石;Am.角闪石;Mag.磁铁矿;Ap.磷灰石;Cal.方解石;Ms.白云母;Agt.霓辉石

      Fig.  6.  Micrographs of titanite in alkaline rocks from Dazhuang Nb-REE deposit

      图  7  大庄铌-稀土矿碱性岩中榍石的BSE图像

      Fig.  7.  BSE images of titanites in alkaline rocks from the Dazhuang Nb-REE deposit

      图  8  大庄铌-稀土矿碱性岩中榍石球粒陨石标准化稀土配分图(a)和原始地幔标准化微量元素蛛网图(b)(标准化值据Sun and McDonough, 1989

      Fig.  8.  Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element patterns (b) for titanite in alkaline rocks from the Dazhuang Nb-REE deposit (normalized data after Sun and McDonough, 1989)

      图  9  大庄铌-稀土矿碱性岩中榍石的REE与Th、U、Nb、Ta、Zr、Hf、La、Y、Th/U、Nb/Ta关系图解

      Fig.  9.  Plots of REE vs. Th, U, Nb, Ta, Zr, Hf, La, Y, Th/U and Nb/Ta for titanite in alkaline rocks from the Dazhuang Nb-REE deposit

      图  10  大庄铌-稀土矿碱性岩中榍石的Nb-Ta、Th-U、Zr-Hf和Sm-Nd图解

      Fig.  10.  Plots of Nb vs. Ta, Th vs. U, Zr vs. Hf and Sm vs. Nd for titanite in alkaline rocks from the Dazhuang Nb-REE deposit

      图  11  大庄铌-稀土矿碱性岩中榍石LA-ICP-MS U-Pb年龄Tera-Wasserburg谐和图

      Fig.  11.  LA-ICP-MS Tera-Wasserburg concordia diagrams for titanite in alkaline rocks from the Dazhuang Nb-REE deposit

      图  12  大庄铌-稀土矿碱性岩中榍石(Al2O3+Fe2O3)-TiO2 (a)和(Al2O3+Fe2O3)-F(b)图解

      Fig.  12.  Diagrams of (Al2O3+Fe2O3) vs. TiO2 (a) and (Al2O3+Fe2O3) vs. F (b) for titanite in alkaline rocks from the Dazhuang Nb-REE deposit

      表  1  华北克拉通南缘及秦岭造山带新元古代岩浆活动记录

      Table  1.   Neoproterozoic magmatic activity records in the southern margin of North China craton and Qinling orogenic belt

      构造背景 样品岩性 采样位置 时代(Ma) 方法 资料来源
      同碰撞 花岗质脉体 北秦岭牛角山岩体 929±25 SHRIMP锆石U-Pb 王涛等,2005
      片麻状花岗岩 北秦岭牛角山岩体 955±13 SHRIMP锆石U-Pb
      二云母花岗片麻岩 北秦岭牛角山岩体 954.6±5.1 TIMS锆石U-Pb 陈志宏,2004
      花岗闪长质片麻岩 北秦岭西涝峪 956±8 TIMS锆石U-Pb Chen et al., 2006
      黑云母二长片麻岩 北秦岭德河岩体 923±23 LA-ICP-MS锆石U-Pb Wang et al., 2011a
      964.4±5.2 TIMS锆石U-Pb 陈志宏,2004
      943±18 SHRIMP锆石U-Pb
      黑云斜长片麻岩 948.1±8.9 SIMS锆石U-Pb 刘丙祥等,2013
      花岗质糜棱岩 北秦岭方庄岩体 933.4±9.2 SIMS锆石U-Pb
      闪长岩 北秦岭拉鸡庙 973±60 LA-ICP-MS锆石U-Pb 刘军锋等,2009
      石英二长片麻岩 北秦岭郭家坪 953.4±14 SHRIMP锆石U-Pb 陆松年等,2005
      二云母花岗片麻岩 北秦岭卢氏狮子坪 954.6±5.1 TIMS锆石U-Pb 陈志宏,2004
      黑云母花岗闪长质片麻岩 北秦岭李家庄 937±21 SHRIMP锆石U-Pb
      花岗闪长质片麻岩 北秦岭西峡石槽沟 955.5±8.4 TIMS锆石U-Pb
      黑云母花岗片麻岩 北秦岭西峡寨根 914±10 SHRIMP锆石U-Pb
      花岗质片麻岩 西秦岭新阳岩体 981±5 LA-ICP-MS锆石U-Pb 丁仨平等,2006
      938±4
      黑云母花岗闪长质片麻岩 978.5±4.8 LA-ICP-MS锆石U-Pb 裴先治等,2007
      黑云母二长花岗质片麻岩 935.5±3.5 LA-ICP-MS锆石U-Pb
      花岗质片麻岩 西秦岭元龙岩体 924.2±2.7 LA-ICP-MS锆石U-Pb 刘会彬等,2006
      黑云母二长花岗质片麻岩 914.7±7.6 LA-ICP-MS锆石U-Pb 裴先治等,2007
      后碰撞 花岗闪长岩 北秦岭蔡凹岩体 889±10 LA-ICP-MS 张成立等,2004
      二长花岗片麻岩 北秦岭两河口岩体 851.8±1.9 TIMS锆石U-Pb 陈隽璐等,2004
      蚀变角闪辉绿(辉长)岩 中秦岭小茅岭复式岩体 864.4±1.7 LA-ICP-MS锆石U-Pb 刘仁燕等,2011
      蚀变闪长岩 中秦岭小茅岭复式岩体 846.7±2.7 LA-ICP-MS锆石U-Pb
      蚀变石英闪长岩 中秦岭小茅岭复式岩体 859.4±1.7 LA-ICP-MS锆石U-Pb
      蚀变二长闪长岩 中秦岭小茅岭复式岩体 861.1±1.8 LA-ICP-MS锆石U-Pb
      板内裂解 变辉长岩 华北克拉通南缘栾川软玉矿 849.5±5.1 SIMS锆石U-Pb Ling et al., 2015
      辉长岩 华北克拉通南缘栾川群 830±6 LA-ICP-MS锆石U-Pb Wang et al., 2011b
      830±7 LA-ICP-MS锆石U-Pb
      826±34 LA-ICP-MS/SHRIMP锆石U-Pb
      霓辉正长岩 华北克拉通南缘双山岩体 844.3±1.6 SHRIMP锆石U-Pb 包志伟等,2008
      粗面岩 华北克拉通南缘栾川群 840±4 LA-ICP-MS锆石U-Pb 胡国辉等,2019
      845±5
      846±6
      854±8 李振生等,2020
      霞石正长岩 华北克拉通南缘大庄铌-稀土矿 848±35 LA-ICP-MS榍石U-Pb 本文
      849±22
      843±30
      845±20
      845±24
      849±40
      下载: 导出CSV
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