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冈底斯岩浆带中段岩浆混合作用：来自花岗杂岩的证据

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文章导航 > 岩石学报 > 2006 > 22(4): 835-844

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董国臣[1,2] 莫宣学[1,2] 赵志丹[1,2] 朱弟成 王亮亮[1,2] 陈涛 李冰. 冈底斯岩浆带中段岩浆混合作用：来自花岗杂岩的证据[J]. 岩石学报, 2006, 22(4): 835-844.
引用本文: 董国臣[1,2] 莫宣学[1,2] 赵志丹[1,2] 朱弟成 王亮亮[1,2] 陈涛 李冰. 冈底斯岩浆带中段岩浆混合作用：来自花岗杂岩的证据[J]. 岩石学报, 2006, 22(4): 835-844.
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DONG GuoChen~. Magma mixing in middle part of Gangdise magma belt:Evidences from granitoid complex.[J]. Acta Petrologica Sinica, 2006, 22(4): 835-844.
Citation: DONG GuoChen~. Magma mixing in middle part of Gangdise magma belt:Evidences from granitoid complex.[J]. Acta Petrologica Sinica, 2006, 22(4): 835-844.
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冈底斯岩浆带中段岩浆混合作用：来自花岗杂岩的证据

    • [1]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [2]中国地质大学地球科学与资源学院,北京100083 [3]成都地质矿产研究所,成都610082

  • 基金项目:

    国家重点基础研究发展规划项目（编号：2002CB412600）、国家自然科学基金（40473020,40103003,40503005,40572048）、国土资源部青藏专项计划（200101020401）和中国地调局综合研究项目联合资助.

Magma mixing in middle part of Gangdise magma belt:Evidences from granitoid complex.

    • 1. State Key laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China; 2. School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China; 3. Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, China

    摘要
  • 巨型冈底斯岩浆岩带横旦于青藏高原南部,主要由花岗质岩石组成,其中存在大量的镁铁质微粒包体,以辉长岩为主的基性岩相对集中在岩浆岩带南部.辉长岩类与花岗质岩石呈渐变过渡关系.辉长岩中出现有石英,暗色矿物沿着长石颗粒边部分布,花岗闪长岩中出现有基性倍长石（An＞80）,辉长岩中有中长石（An=45）出现,镁铁质微粒包体（MME）包体中倍长石-钙长石（An=72～90）和中长石（An=37）共存,这些矿物组合的不协调现象是岩浆演化过程中混合作用的表现形式;MME的化学成分相对高钾、铝和铁镁,MME、花岗岩类寄主岩及辉长岩类岩石化学成分呈直线变异趋势（相对MgO）,MME的SiO2和K2O、Na2O成分的过渡性变化也都反映出混合作用特征;基性辉长岩类、酸性花岗质岩石和MME包体的稀土配分模式基本一致,其微量元素特征也具有明显的一致性,反映了岩浆混合作用的特征;辉长岩类的^143Nd/^144Nd比值较高,^87Sr/^86Sr比值较低,而偏酸性的花岗质岩石中^143Nd/^144Nd比值较低,^87Sr/^86Sr比值较高,构成直线性分布趋势,并位于地幔演化线的延伸方向上,显示区域岩浆混合作用特征;辉长岩、花岗岩类和MME的同位素年龄值十分接近,也表明三者属于岩浆混旌献饔貌？研究证明,冈底斯岩浆岩带中不同岩性均由不同比例的基性端元和酸性端元成分混合而成,其中基性端元成分所占的比例变化在16%～90%不等,仅从侵入岩浆推算,幔源基性岩浆对冈底斯地壳垂向增厚的贡献率超过5%.可以推断,随着俯冲-碰撞过程中产生的基性岩浆底侵作用,冈底斯岩浆岩带发生壳幔岩浆混合作用,其时代为50～45Ma,属于印度-欧亚大陆碰撞开始15Ma后的主碰撞期内,岩浆混合作用是碰撞过程中壳幔物质与成分交换的主要形式之一,是研究主碰撞带北部青藏高原的陆壳增生与改造、地壳结构及成分变化重要途径之一.
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收稿日期:  2005-12-20
修回日期:  2006-03-10
刊出日期:  2006-04-30

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