| 北祁连山西段早元古代变质火山岩的地球化学特征及其构造背景 |
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| 引用本文： | 张招崇,毛景文.北祁连山西段早元古代变质火山岩的地球化学特征及其构造背景[J].矿物岩石,1998,18(4):22-30. |
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| 作者姓名： | 张招崇 毛景文 |
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| 作者单位： | [1]中国地质科学院地质研究所 [2]中国地质科学院矿床地质研究所 |
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| 摘 要： | 产于北大河群的早元古代火山岩是北祁连山西段最主要的三期火山岩之一，其地球化学特征表明，该期火山岩的原岩为具有双峰式组合的拉斑玄武岩和中酸笥凝灰岩。两者具有完全不同的稀土分布型式，前者以极低的富集轻稀土为特征，而后者以强烈富集轻稀土的特征；基性火山岩的微量元素分布曲线指示了其形成了裂陷槽环境。结合Ｎｄ同位素特征以及区域２得出本区早元古代变质火山岩形成于裂陷槽环境。
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| 关 键 词： | 早元古代 火山岩 地球化学 构造背景 |
GEOCHEMISTRY OF THE PROTEROZOIC METAMORPHIC VOLCANIC ROCKS IN THE WEST PART OF NORTH QILIAN MOUNTAINS AND THEIR TECTONIC SETTING |
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| Zhang Zhaochong,Mao Jingwen,Zuo Guochao,Yang Jianmin,Wang Zhiliang,Zhang Zuoheng.GEOCHEMISTRY OF THE PROTEROZOIC METAMORPHIC VOLCANIC ROCKS IN THE WEST PART OF NORTH QILIAN MOUNTAINS AND THEIR TECTONIC SETTING[J].Journal of Mineralogy and Petrology,1998,18(4):22-30. |
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| Authors: | Zhang Zhaochong Mao Jingwen Zuo Guochao Yang Jianmin Wang Zhiliang Zhang Zuoheng |
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| Institution: | Zhang Zhaochong 1 Mao Jingwen 2 Zuo Guochao 3 Yang Jianmin 2 Wang Zhiliang 2 Zhang Zuoheng 2 |
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| Abstract: | The Early Proterozoic volcanic rocks in Beidahe Group is one of three cycles of the most important volcanic rocks in the west part of north Qilian Mountains.Their geochemical characteristics show that their primitive rock is tholleiite and intermediate acid tuff with bimodal association,which have different REE patterns.The former are characterized by very slightly enrichment in LREE,but the latter are characterized by strong enrichment LREE.The trace element patterns of their basic rocks indicate that they formed in depression trough.Their Nd isotopic characteristics and regional geological background also imply that the Early Proterozoic volcanic rocks formed in depression trough. |
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| Keywords: | Early Proterozoic volcanic rocks geochemistry tectonic setting |
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