| 桂东南马山沿灵山断裂出露的印支期洋岛玄武岩及其区域构造意义 |
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| 引用本文： | 吴根耀,李曰俊.桂东南马山沿灵山断裂出露的印支期洋岛玄武岩及其区域构造意义[J].现代地质,2011,25(4). |
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| 作者姓名： | 吴根耀 李曰俊 |
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| 作者单位： | 中国科学院地质与地球物理研究所,北京,100029 |
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| 摘 要： | 桂东南沿灵山断裂出露的马山印支期玄武岩的常量元素特征指示它属洋岛碱性玄武岩,微量元素含量显示出大洋板内玄武岩的特点。稀土元素配分型式表现为一组近于平行的向右缓倾曲线,(La/Yb)N=11.69,(Ce/Yb)N=8.64,(Ce/Sm)N=2.41,稀土总量随全碱含量增大有升高的趋势,表明它是亚速尔型洋岛。这首次为桂东南及毗邻的粤西南地区属古特提斯造山带、灵山断裂是古特提斯分支洋盆闭合后的缝合线提供了来自洋盆内地质记录的证据。结合粤桂交界区的最近研究成果提出了研究灵山洋演化的工作模式。
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| 关 键 词： | 亚速尔型洋岛 印支期玄武岩 岩石地球化学 古特提斯造山带 灵山断裂 桂东南 |
The Mashan Indosinian Oceanic Island Basalt Outcropping along the Lingshan Fracture in Southeast Guangxi and Its Tectonic Implications |
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| WU Gen-yao,LI Yue-jun.The Mashan Indosinian Oceanic Island Basalt Outcropping along the Lingshan Fracture in Southeast Guangxi and Its Tectonic Implications[J].Geoscience——Journal of Graduate School,China University of Geosciences,2011,25(4). |
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| Authors: | WU Gen-yao LI Yue-jun |
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| Institution: | WU Gen-yao,LI Yue-jun(Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China) |
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| Abstract: | The Mashan Indosinian basalt outcropped along the Lingshan fracture in southeast Guangxi.The discriminant diagrams of major elements showed the tectonic setting of the alkali basalt being oceanic island.The trace element contents indicated the characteristics of oceanic within-plate basalt.The REE patterns of the Ma-shan Indosinian basalt were a group of subparalled and gently right-inclined curves,with(La/Yb)N= 11.69,(Ce/Yb)N=8.64,(Ce/Sm)N=2.41,and a tendency of total REE contents increased with increasing... |
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| Keywords: | Azores-type oceanic island Indosinian basalt petrochemistry Paleotethysides Lingshan fracture southeast Guangxi |
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