| 大兴安岭中生代火山活动构造背景 |
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| 引用本文： | 邵济安,赵国龙,王 忠,韩庆军.大兴安岭中生代火山活动构造背景[J].地质论评,1999,45(7):422-430. |
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| 作者姓名： | 邵济安 赵国龙 王 忠 韩庆军 |
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| 作者单位： | 北京大学综合技术研究所,100871；内蒙古地质矿产局，呼和浩特，010020；中国科学院地质研究所，北京，100029 |
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| 基金项目： | 本文为国家自然科学基金(编号 49672156，49872079)资助项目。 |
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| 摘 要： | 大兴安岭中生代火山岩主要为高钾粗面质火山岩, 属于一套碱质含量比较高的钙碱性火山岩系, 随时间从酸性向中基性方向演化。其元素地球化学特征和Sr、 Nd 同位素组成揭示火山岩具有壳源和幔源两部分源区特点, 玄武质岩石来源于相对未亏损的地幔, 中酸性火山岩则成因于地壳物质的混染或下地壳的重熔作用, 暗示火山岩的形成与陆内深部软流体上涌引起的壳幔相互作用有关。 此外, 本文还从火山活动中心的迁移，以及东邻洋陆板块之间的相互运动角度，阐述了大兴安岭中生代火山活动与大洋板块的俯冲作用无直接联系。
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| 关 键 词： | 大兴安岭 中生代 钙碱性火山岩 俯冲作用 壳幔相互作用 |
Tectonic Setting of Mesozoic Volcanism in Da Hinggan Mountains, Northeastern China |
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| Abstract: | Mesozoic volcanic rocks developed in the Da Hinggan Mts., Northeastern China are characterized by high K, high alkali trachytic calc alkaline seri es and ev olu ted from acid to intermediate basic with the progressive time. Their REE, trace element features and isotopic Sr, Nd compositions distinctly reveal two magma sources,a l ower crust and a relatively undepleted or primary mantle one,indicating that pet rogenesis of the Mesozoic volcanic rocks in the area is ass o ciated with crust mantle interaction resulted from upwelling of deep intraconti nental asthenoli t h.In addition, taking into consideration the migration of volcanic cent er and characteristics of the movement between neighboring continental and oce anic plates in the e ast,it is proposed that there is no direct relationship between Mes ozoic volcanism in the Da Hinggan Mts. and subduction of the oceanic plate. |
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