| 商州蛇绿岩带与晋宁运动 |
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| 引用本文： | 姜常义.商州蛇绿岩带与晋宁运动[J].地质与勘探,1998,34(4):7-12. |
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| 作者姓名： | 姜常义 |
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| 作者单位： | 西安工程学院 |
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| 基金项目： | 北京中关村地区联合测试分析中心和地矿部秦巴攻关项目联合资助 |
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| 摘 要： | 商州蛇绿岩带具有完善的蛇绿岩套岩石组合；细碧岩与堆晶岩系渡型洋中脊玄武岩地球化化学特征。
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| 关 键 词： | 蛇绿带 蛇绿岩 岩石组合 晋宁运动 构造运动 |
THE SHANGZHOU OPHIOLITE BELT AND JINNING MOVEMENT IN QINLING MOUNTAINS |
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| Jiang Changyi,Su Shengrui,Su Chunqian,Shi Huanwen.THE SHANGZHOU OPHIOLITE BELT AND JINNING MOVEMENT IN QINLING MOUNTAINS[J].Geology and Prospecting,1998,34(4):7-12. |
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| Authors: | Jiang Changyi Su Shengrui Su Chunqian Shi Huanwen |
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| Abstract: | The Shangzhou ophiolite belt has the perfect ohpiolite suite rock association and ocurs mainly in the form of ophiolite melange. The study of REE and trace element geochemistry shows that the spilite and cumulates display the features of basalts from a transitional mid-oceanic ridge. The mineralogical and petrologic studies indicate that most of the cumulates were formed by fractional crystallization from a closed system at low pressure. The thickness of oceanic crust calculated with the main elements of spilites is 3.2km, implying that the the Shangzhou ophiolite suite was derived from a slow-spreading ridge. The Sm-Nd isochron age of the cumulate is 832Ma, which indicates that the Shangzhou ophiolite was part of the North Qinling plate system during the Jinning movement. |
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| Keywords: | closed system slow-spreading ridge The Jinning movement plate system |
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