| 从岛弧向裂谷的变迁—来自阿吾拉勒地区火山岩的证据 |
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| 引用本文： | 姜常义,吴文奎,张学仁,崔尚森.从岛弧向裂谷的变迁—来自阿吾拉勒地区火山岩的证据[J].岩石矿物学杂志,1995,14(4):289-300. |
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| 作者姓名： | 姜常义 吴文奎 张学仁 崔尚森 |
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| 作者单位： | 西安地质学院 |
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| 摘 要： | 阿吾拉勒地区早、中石炭世火山岩以碱性系列为主，少部分属钙碱性系列；稀土元素具有岛弧和活动陆缘区橄榄安粗岩和高钾安山岩的特征：微量元素具有大陆型岛弧火山岩的特征。由此证明本区在早、中石炭世处于内弧环境。二叠纪火山岩属碱性系列；稀土元素和微量元素明显有板内碱性玄武岩的特征。
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| 关 键 词： | 火山岩 地球化学 岛弧 裂谷 |
The Change from Island Arc to Rift Valley-Evidence from volcanic Rocks in Awulale Area |
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| Jiang Changyi,Wu Wenkui,Zhang Xueren,Cui Shangsen.The Change from Island Arc to Rift Valley-Evidence from volcanic Rocks in Awulale Area[J].Acta Petrologica Et Mineralogica,1995,14(4):289-300. |
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| Authors: | Jiang Changyi Wu Wenkui Zhang Xueren Cui Shangsen |
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| Abstract: | The Early and Middle Carboniferous volcanic rocks in Awulale area are mainly of alkaline series, with a small part belonging to calc-alkahne series;rare earth elements show cliaracteristics of kohalaite and K-high andesite in the island arc and active epicontinental region; trace elements exhibit features of continental island arc volcanic rocks,It is thtis proved that this area was in an intra- arc environment in Early and Middle Carboniferous. Permian vol-canic rocks are of alkaline series: rare earth eiements and trace elements mani-fest features of intra-plate alkaline basalt.The rock assemblage resembles that of Kenya rift valley, being at the early stage in valley evolution. The Late Carboniferous Begeda tectonic movement led to the change of this area from island arc to rift valley and also to the tranformation of Tianshan Mountains from plate framework to intraplate framework. |
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| Keywords: | Volcanic rock geochemistry island arc riftvalley |
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