东秦岭花山复式岩基中蒿坪与金山庙花岗岩体岩石地球化学、锆石U-Pb年代学和Lu-Hf同位素组成

肖娥, 胡建, 张遵忠, 戴宝章, 王艳芬, 李海勇. 2012. 东秦岭花山复式岩基中蒿坪与金山庙花岗岩体岩石地球化学、锆石U-Pb年代学和Lu-Hf同位素组成. 岩石学报, 28(12): 4031-4046.
引用本文: 肖娥, 胡建, 张遵忠, 戴宝章, 王艳芬, 李海勇. 2012. 东秦岭花山复式岩基中蒿坪与金山庙花岗岩体岩石地球化学、锆石U-Pb年代学和Lu-Hf同位素组成. 岩石学报, 28(12): 4031-4046.
XIAO E, HU Jian, ZHANG ZunZhong, DAI BaoZhang, WANG YanFen, LI HaiYong. 2012. Petrogeochemistry, zircon U-Pb dating and Lu-Hf isotopic compositions of the Haoping and Jinshanmiao granites from the Huashan complex batholith in eastern Qinling Orogen. Acta Petrologica Sinica, 28(12): 4031-4046.
Citation: XIAO E, HU Jian, ZHANG ZunZhong, DAI BaoZhang, WANG YanFen, LI HaiYong. 2012. Petrogeochemistry, zircon U-Pb dating and Lu-Hf isotopic compositions of the Haoping and Jinshanmiao granites from the Huashan complex batholith in eastern Qinling Orogen. Acta Petrologica Sinica, 28(12): 4031-4046.

东秦岭花山复式岩基中蒿坪与金山庙花岗岩体岩石地球化学、锆石U-Pb年代学和Lu-Hf同位素组成

  • 基金项目:

    本文受国家重点基础研究发展规划项目(2006CB403506)和国家自然科学青年基金项目(41102036)联合资助.

详细信息
    作者简介:

    肖娥,女,1983年生,博士生,矿产普查与勘探专业,E-mail: xiaoe123@gmail.com

  • 中图分类号: P588.121;P597.3

Petrogeochemistry, zircon U-Pb dating and Lu-Hf isotopic compositions of the Haoping and Jinshanmiao granites from the Huashan complex batholith in eastern Qinling Orogen

  • 蒿坪与金山庙花岗岩体位于华北陆块南缘,是熊耳山地区花山复式岩基的重要组成部分。锆石LA-ICP-MS U-Pb定年显示,蒿坪岩体两个样品年龄为128.7±1.0Ma和129.3±2.4Ma,金山庙岩体一个样品年龄为127.6±1.6Ma,均为早白垩世岩浆作用的产物。蒿坪岩体以发育碱性长石大斑晶为主要特征,主要组成矿物为碱性长石、斜长石、石英、黑云母和少量角闪石等,而金山庙岩体矿物组合则为碱性长石、斜长石、石英和黑云母。化学组成上二岩体均具高硅准铝、富碱高钾及富铁贫镁的特征,轻重稀土元素分馏显著,Eu异常较弱或无明显Eu异常,Eu/Eu*为0.69~1.26,富集Cs、Rb、Ba、Sr等大离子亲石元素,亏损Nb、Ta、Ti、Y等高场强元素,在成因类型上可归为I型花岗岩,其中金山庙岩体经历了更高程度的分离结晶作用(D.I.=96.6~97.3),应属高分异I型花岗岩。锆石Lu-Hf同位素分析结果显示,蒿坪岩体εHf(t) 为-10.2~-13.3,tDM2为1.8 Ga~2.0 Ga,金山庙岩体εHf(t) 为-13.3~-17.5,tDM2为2.0~2.2Ga,表明二者的源区很可能是遭受了幔源或新生地壳改造的太华群古老基底物质。根据区域地质和全岩地球化学组成及产出动力地质背景的全面分析,表明蒿坪与金山庙岩体应形成于扬子陆块与华北陆块碰撞造山后的陆内伸展引张环境,是古特提斯构造域向古太平洋构造域转换体制下岩浆作用的产物。在成岩过程中,蒿坪和金山庙岩浆体系释放出大量富挥发组分(如F, Cl) 的热液流体(特别是高分异的金山庙岩体),萃取富集了围岩中的成矿物质或是叠加改造了先期(印支期或燕山早期) 形成的金矿床,使之运移至构造交汇部位规模性成矿。

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  • 图 1 

    东秦岭花山复式岩基地质简图

    Figure 1. 

    Sketch map showing the regional geology of the Huashan complex batholith in eastern Qinling orogen

    图 2 

    蒿坪与金山庙岩体岩相学特征

    Figure 2. 

    Petrographical characteristics of the Haoping and Jinshanmiao plutons

    图 3 

    金山庙(a) 与蒿坪岩体(b、c) 锆石阴极发光(CL) 图像

    Figure 3. 

    CL images of zircons from the Jinshanmiao (a) and Haoping (b, c) plutons

    图 4 

    金山庙与蒿坪岩体锆石U-Pb年龄谐和图

    Figure 4. 

    Zircon U-Pb concordia diagrams for the Jinshanmiao and Haoping plutons

    图 5 

    蒿坪与金山庙岩体A/CNK-A/NK (a,据Maniar and Piccolli, 1989) 及A.R-SiO2(b,据Wright, 1969) 关系图

    Figure 5. 

    A/CNK-A/NK (a, after Maniar and Piccolli, 1989) and A.R-SiO2(b, Wright, 1969) diagrams for the Haoping and Jinshanmiao plutons

    图 6 

    蒿坪与金山庙岩体SiO2-P2O5(a) 和SiO2-Pb (b) 关系图解(据Chappell and White, 1992)

    Figure 6. 

    SiO2-P2O5(a) and SiO2-Pb (b) diagrams of the Haoping and Jinshanmiao plutons (after Chappell and White, 1992)

    图 7 

    蒿坪与金山庙岩体微量元素原始地幔标准化蛛网图(a, 标准化值据McDonough and Sun, 1995) 及稀土球粒陨石标准化配分曲线(b, 标准化值据Boynton, 1984)

    Figure 7. 

    Primitive mantle-normalized spidergrams (a, normalization values after McDonough and Sun, 1995) and chondrite normalized REE distribution patterns (b, normalization values after Boynton, 1984) for the Haoping and Jinshanmiao plutons

    图 8 

    蒿坪(a) 与金山庙(b) 岩体锆石Hf同位素组成

    Figure 8. 

    Zircon Hf isotopic compositions of the Haoping (a) and Jinshanmiao (b) plutons

    图 9 

    蒿坪与金山庙岩体Zr+Nb+Ce+Y对FeOT/MgO、(K2O+Na2O)/CaO及10000×Ga/Al图解(a, b据Whalen et al., 1987; c, 据Eby, 1990)

    Figure 9. 

    Zr+Nb+Ce+Y vs. FeOT/MgO, (K2O+Na2O)/CaO and 10000×Ga/Al diagrams of the Haoping and Jinshanmiao plutons (a, b, after Whalen et al., 1987; c, after Eby, 1990)

    图 10 

    蒿坪与金山庙岩体的εHf(t)-t图解

    Figure 10. 

    εHf(t)-t diagram of the Haoping and Jinshanmiao plutons

    图 11 

    蒿坪与金山庙岩体构造环境判别图(a, 据Batchelor and Bowden, 1985;b, 据Pearce, 1996)

    Figure 11. 

    Tectonic discrimination diagrams of the Haoping and Jinshanmiao plutons (a, after Batchelor and Bowden, 1985; b, after Pearce, 1996)

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出版历程
收稿日期:  2012-05-02
修回日期:  2012-10-06
刊出日期:  2012-12-01

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