秦岭造山带早古生代蛇绿岩的多阶段演化:从岛弧到弧间盆地

李源, 杨经绥, 裴先治, 张建, 陈隽璐, 陈松永, 徐向珍. 2012. 秦岭造山带早古生代蛇绿岩的多阶段演化:从岛弧到弧间盆地. 岩石学报, 28(6): 1896-1914.
引用本文: 李源, 杨经绥, 裴先治, 张建, 陈隽璐, 陈松永, 徐向珍. 2012. 秦岭造山带早古生代蛇绿岩的多阶段演化:从岛弧到弧间盆地. 岩石学报, 28(6): 1896-1914.
LI Yuan, YANG JingSui, PEI XianZhi, ZHANG Jian, CHEN JuanLu, CHEN SongYong, XU XiangZhen. 2012. A model for multi-stage of the Early Palaeozoic Danfeng ophiolite in Qinling orogen belt: From arc to inter-arc basin. Acta Petrologica Sinica, 28(6): 1896-1914.
Citation: LI Yuan, YANG JingSui, PEI XianZhi, ZHANG Jian, CHEN JuanLu, CHEN SongYong, XU XiangZhen. 2012. A model for multi-stage of the Early Palaeozoic Danfeng ophiolite in Qinling orogen belt: From arc to inter-arc basin. Acta Petrologica Sinica, 28(6): 1896-1914.

秦岭造山带早古生代蛇绿岩的多阶段演化:从岛弧到弧间盆地

  • 基金项目:

    本文受中国地质调查局地质调查项目(1212010711816)资助.

详细信息
    作者简介:

    李源,男,1973年生,博士,矿物学、岩石学与矿床学专业,E-mail: liyuancags@126.com

  • 中图分类号: P588.124; P588.145; P597.3

A model for multi-stage of the Early Palaeozoic Danfeng ophiolite in Qinling orogen belt: From arc to inter-arc basin

  • 秦岭商-丹缝合带是分隔北秦岭早古生代造山带和南秦岭晚古生代造山带的地质界线,其中的丹凤蛇绿岩被认为代表了秦岭地区早古生代的洋壳残片。迄今,前人已经提出多种模式来解释丹凤蛇绿岩成因和构造背景(如:岛弧、洋岛和成熟的大洋等)。然而,这些单一的构造演化模式却很难解释两个基本事实:(1)不同类型镁铁质岩(如N-MORB、E-MORB和IAT等)的穿时性分布;(2)几乎所有的早古生代镁铁质岩都显示出多种构造环境的叠加。对陕西太白鹦鸽嘴地区一条具有较完整层序的蛇绿岩剖面研究发现,剖面中存在HTI型(TiO2:1.21%~1.56%)和LTI(TiO2:0.09%~0.35%)两种类型的镁铁质岩(包括玄武岩和辉长岩),HTI型镁铁质岩具有LREE亏损,没有Nb、Ta负异常等的E-MORB特征;LTI具有LREE富集,Nb、Ta负异常的IAT特征。地球化学显示二者的源区均为北秦岭岩石圈地幔楔。本文获得鹦哥嘴蛇绿岩两个LTI型辉长岩锆石U-Pb年龄分别为523.8±1.3Ma和474.3±1.4Ma。认为秦岭早古生代蛇绿岩应是SSZ 环境下多阶段演化的结果:第一阶段:约524Ma,秦岭洋盆向北俯冲开始。俯冲板片的脱水作用使熔融温度降低,形成的流体交代地幔楔,在北秦岭南缘产生了一个不成熟的岛弧;第二阶段:先存岛弧裂开阶段,约524~474Ma。秦岭洋壳的持续俯冲,在先形成的岛弧上拉张出了弧间盆地,形成了主要由轻稀土亏损、高Ti拉斑玄武岩和辉长岩组成的E-MORB型岩石组合;第三阶段:弧前盆地闭合阶段,474Ma之后。在这个阶段新生的弧间盆地闭合,俯冲洋壳携带的深海沉积物与北秦岭岩石圈地幔楔相互作用形成了北秦岭李子园的玻安岩。秦岭早古生代蛇绿岩的多阶段成因是典型特提斯构造域演化特征在秦岭地区的重现。

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  • 图 1 

    北秦岭造山带构造简图(据张国伟等,2001简化)

    Figure 1. 

    Geological sketch map of the North Qinling orogenic belt (after Zhang et al., 2001)

    图 2 

    北秦岭鹦鸽嘴地质简图(a)及采样点剖面图(b)(据陈隽璐等,2008修改简化)

    Figure 2. 

    The geological map (a) and sampling section (b) from Yinggezui, North Qinling (after Chen et al., 2008)

    图 3 

    北秦岭鹦鸽嘴蛇绿混杂岩蛇纹岩野外露头(a, b)与显微照片(c)

    Figure 3. 

    Outcrops (a, b) and micro-photograph (c) of the serpentinite of the Yinggezui ophiolite, North Qinling

    图 4 

    北秦岭鹦鸽嘴基性火山岩野外露头(a)及显微照片(b)

    Figure 4. 

    Outcrops (a) and micro-photograph (b) of the mafic lava of the Yinggezui ophiolites, North Qinling

    图 5 

    北秦岭鹦鸽嘴变辉长岩野外露头(a, b)及显微照片(c)

    Figure 5. 

    Outcrops (a, b) and micro-photograph (c) of the grabbro of the Yinggezui ophiolites, North Qinling

    图 6 

    鹦鸽嘴超镁铁质岩样品REE球粒陨石标准化图解 (a, 球粒陨石值据Boynton, 1984)和微量元素原始地幔标准化图解(b, 原始地幔值据Sun and McDonough, 1989)

    Figure 6. 

    Chondrite-normalized REE pattern (a, chondrite values after Boynton, 1984) and N-MORB-normalized trace elements pattern (b, primitive mantle values after Sun and McDonough, 1989) for serpentinites from Yinggezui ophiolite

    图 7 

    北秦岭鹦鸽嘴镁铁质岩样品FAM图解(据Irvine and Barager, 1971)

    Figure 7. 

    FAM diagram for mafic lavas from Yinggezui ophiolite, North Qinling (after Irvine and Barager, 1971)

    图 8 

    北秦岭鹦鸽嘴镁铁质岩、玄武安山岩与英安岩样品稀土元素球粒陨石标准化图解(球粒陨石值据Boynton, 1984)

    Figure 8. 

    Chondrite-normalized REE pattern for mafic lavas and gabbros from Yinggezui ophiolite, North Qinling (chondrite values after Boynton, 1984)

    图 9 

    北秦岭鹦鸽嘴镁铁质岩样品微量元素N-MORB标准化图解(N-MORB值据Sun and McDonough, 1989)

    Figure 9. 

    N-MORB-normalized trace elements pattern for mafic lavas and gabbros from Yinggezui ophiolite, North Qinling (N-MORB values after Sun and McDonough, 1989)

    图 10 

    北秦岭鹦鸽嘴辉长岩样品(08Y-1031、08Y-1042)部分锆石阴极发光图像(a, c)和206Pb/238U-207Pb/235U平均年龄(b, d)

    Figure 10. 

    CL images of zircon (a, c) and LA-ICP-MS U-Pb zircon concordia diagram (b, d) for the gabbro (08Y-1031 and 08Y-1042) from Yinggezui ophiolite, North Qinling

    图 11 

    北秦岭鹦鸽嘴镁铁质岩样品Th-U/Th和Th-Ba/Th图解

    Figure 11. 

    Th-U/Th and Th-Ba/Th diagram for mafic lavas from Yinggezui ophiolite, North Qinling

    图 12 

    鹦鸽嘴蛇纹岩样品尖晶石Mg#-Cr# (a)与TiO2-Cr#(b, 据Pearce, 2000)

    Figure 12. 

    A plot of Mg# against Cr# (a) and TiO2 against Cr# (b, after Pearce, 2000) for spinels from serpentinites of Yinggezui ophiolite

    图 13 

    鹦鸽嘴蛇绿岩镁铁质岩样品Sm/Nd-εNd(t) (a)和Y-Y/Tb (b)图解

    Figure 13. 

    plot of Sm/Nd against εNd(t) and Y against Y/Tb for mafic lavas from Yinggezui ophiolite

    图 14 

    北秦岭鹦鸽嘴镁铁质岩样品MgO与FeOT、CaO、P2O5、Zr、V、Cr、Ni的Harker图解

    Figure 14. 

    MgO against FeOT, CaO, P2O5, Zr, V, Cr, Ni diagram for mafic lavas from Yinggezui ophiolite, North Qinling

    图 15 

    北秦岭鹦鸽嘴镁铁质岩样品微量元素FMM标准化图解(FMM值据Sun and McDonough, 1989)

    Figure 15. 

    FMM-normalized Trace Elements pattern for mafic lavas and gabbros from Yinggezui ophiolite, North Qinling (FMM values after Sun and McDonough, 1989)

    图 16 

    北秦岭鹦鸽嘴镁铁质岩Mg#-TiO2(a)、Zr-Ni (b)、Ti-V(c)图解(据Huot et al., 2002)

    Figure 16. 

    Mg# against TiO2 (a), Zr against Ni (b) and Ti against V (c) diagram for mafic lavas from Yinggezui ophiolite, North Qinling (after Huot et al., 2002)

    图 17 

    北秦岭早古生代造山带蛇绿岩成因模式图

    Figure 17. 

    Schematic cartoon showing the tectonic evolutionary of the Early Paleozoic ophiolites and in the North Qinling orogen

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收稿日期:  2012-01-08
修回日期:  2012-04-18
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