华北地块南缘黑山-木龙沟地区中酸性岩的锆石U-Pb年龄、岩石化学和Sr-Nd-Hf同位素研究

柯昌辉, 王晓霞, 李金宝, 杨阳, 齐秋菊, 周晓宁. 2013. 华北地块南缘黑山-木龙沟地区中酸性岩的锆石U-Pb年龄、岩石化学和Sr-Nd-Hf同位素研究. 岩石学报, 29(3): 781-800.
引用本文: 柯昌辉, 王晓霞, 李金宝, 杨阳, 齐秋菊, 周晓宁. 2013. 华北地块南缘黑山-木龙沟地区中酸性岩的锆石U-Pb年龄、岩石化学和Sr-Nd-Hf同位素研究. 岩石学报, 29(3): 781-800.
KE ChangHui, WANG XiaoXia, LI JinBao, YANG Yang, QI QiuJu, ZHOU XiaoNing. 2013. Zircon U-Pb age, geochemistry and Sr-Nd-Hf isotopic geochemistry of the intermediate-acid rocks from the Heishan-Mulonggou area in the southern margin of North China Block.. Acta Petrologica Sinica, 29(3): 781-800.
Citation: KE ChangHui, WANG XiaoXia, LI JinBao, YANG Yang, QI QiuJu, ZHOU XiaoNing. 2013. Zircon U-Pb age, geochemistry and Sr-Nd-Hf isotopic geochemistry of the intermediate-acid rocks from the Heishan-Mulonggou area in the southern margin of North China Block.. Acta Petrologica Sinica, 29(3): 781-800.

华北地块南缘黑山-木龙沟地区中酸性岩的锆石U-Pb年龄、岩石化学和Sr-Nd-Hf同位素研究

  • 基金项目:

    本文受地质调查项目(1212010012012)和公益性行业专项课题(200911007-09)联合资助.

详细信息
    作者简介:

    柯昌辉,男,1987年生,硕士生,矿物学、岩石学、矿床学专业,E-mail: kechanghuicags@126.com

    通讯作者: 王晓霞,女,1960年生,博士,研究员,矿物学、岩石学、矿床学专业,E-mail: xiaoxiawang@hotmail.com
  • 中图分类号: P588.122;P597.3

Zircon U-Pb age, geochemistry and Sr-Nd-Hf isotopic geochemistry of the intermediate-acid rocks from the Heishan-Mulonggou area in the southern margin of North China Block.

More Information
  • 华北地块南缘黑山-木龙沟地区晚中生代中酸性岩的LA-ICPMS锆石U-Pb定年结果表明,黑山下斜辉石黑云母闪长岩和木龙沟花岗闪长斑岩的成岩年龄分别为154±2Ma (2σ,N=16)和151±1Ma (2σ,N=15)。该中酸性岩的A/CNK=0.75~1.04,Na2O+K2O=6.15%~8.42%,K2O/Na2O=0.77~2.29,属于准铝质-弱过铝质和高钾钙碱性/钾玄岩系列。在稀土和微量元素上,富集LREE和Rb、Ba、K、Pb、Sr等大离子亲石元素,亏损HREE和Zr、Hf、Ta、Nb、P、Ti等高场强元素,具有弱的负铕异常(δEu=0.85~0.99)。在同位素上,全岩的ISr为0.708676~0.711480,εNd(t)变化于-22~-16.1之间,tDM2为2.25~2.72Ga;锆石的εHf(t)为-27.8~-18.4,二阶段模式年龄tDM2为2.37~2.96Ga。岩石地球化学和Sr-Nd-Hf同位素组成特征显示,这些中酸性岩的源区物质由古老的壳源物质和年轻组分组成,其中以壳源物质为主,可能为太古宙太华群。岩相学和区域地质特征显示,年轻组分可能为幔源组分,岩体可能是由底侵的幔源岩浆与其诱发部分熔融的壳源岩浆混合形成的。

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  • 图 1 

    东秦岭地区晚中生代花岗岩类及钼矿床分布(据卢欣祥等, 1999;陕西省204分队,1990修改)

    Figure 1. 

    Sketch map of the distribution of the Mesozoic granitoids and the molybdenum deposits in the Eastern Qinling (modified after Lu et al., 1999)

    图 2 

    黑山-木龙沟一带地质简图(据陕西省204分队,1990修改)

    Figure 2. 

    Geological sketch map of the Heishan-Mulonggou area

    图 3 

    黑山-木龙沟地区中酸性岩的岩相学特征

    Figure 3. 

    Petrography of the intermediate-acid rocks from the Heishan-Mulonggou area

    图 4 

    下斜和木龙沟花岗岩类的锆石阴极发光图像

    Figure 4. 

    Zircon CL images of granitoids from the Xiaxie and Mulonggou plutons

    图 5 

    下斜辉石黑云母闪长岩(a)和木龙沟花岗闪长斑岩(b)锆石U-Pb谐和图

    Figure 5. 

    Zircon U-Pb concordia diadiagram for the pyroxene-biotite diorite from the xiaxie pluton (a) and the granodiorite porphyry from the Mulonggou pluton (b)

    图 6 

    黑山-木龙沟地区及其外围中酸性岩SiO2-K2O (a)图解及A/CNK-A/NK (b)图解(底图据Rickwood, 1989Peccerillo and Taylor, 1976)

    Figure 6. 

    SiO2vs. K2O (a) and A/CNK vs. A/NK (b) diagrams of the intermediate-acid rocks from the Heishan-Mulonggou area and its surroundings (after Rickwood, 1989; Peccerillo and Taylor, 1976)

    图 7 

    黑山-木龙沟地区及其外围中酸性岩的微量元素原始地幔标准化蛛网图及稀土元素球粒陨石标准化图解(球粒陨石、原始地幔标准化值据Sun and McDonough, 1989)

    Figure 7. 

    Primitive mantlenormalized traceelement spider diagrams and chondritenormalized REE patterns of the intermediate-acid rocks from the Heishan-Mulonggou area and its surroundings (primitive mantle and chondrite after Sun and McDonough, 1989)

    图 8 

    黑山-木龙沟地区及其外围中酸性岩的ISr-tεNd(t)-t图解(据韩吟文等,2003王晓霞等,2011)

    Figure 8. 

    Diagram of ISr-t and εNd(t)-t of the intermediate-acid rocks from the Heishan-Mulonggou area and its surroundings (after Han et al., 2003; Wang et al., 2011)

    图 9 

    黑山-木龙沟地区及其外围中酸性岩εNd(t)-εSr(t)图解(据Zindler and Hart, 1986DePaolo and Wasserburg, 1979王晓霞等,2011Ni et al., 2012)

    Figure 9. 

    Diagram of εNd(t)-εSr(t) of the intermediate-acid rocks from the Heishan-Mulonggou area and its surroundings (after Zindler and Hart, 1986; DePaolo and Wasserburg, 1979; Wang et al., 2011; Ni et al., 2012)

    图 10 

    黑山-木龙沟花岗岩的Hf同位素演化图解

    Figure 10. 

    Diagram of εHf(t)-t and (176Hf/177Hf)i-t of the dioritoid from the the Heishan and Mulonggou plutons

    图 11 

    黑山-木龙沟地区及其外围中酸性岩锆石εHf(t)及其二阶段模式年龄(tDM2)和分布直方图

    Figure 11. 

    Zircon tDM2and Hf isotopic compositions of the intermediate-acid rocks from the Heishan-Mulonggou area and its surroundings

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出版历程
收稿日期:  2012-05-02
修回日期:  2012-12-12
刊出日期:  2013-03-01

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