| 峨眉山玄武岩微量元素地球化学的初步研究 |
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| 引用本文： | 黄开年,杨瑞英,王小春,黄忠祥,刘秉光.峨眉山玄武岩微量元素地球化学的初步研究[J].岩石学报,1988,4(4). |
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| 作者姓名： | 黄开年 杨瑞英 王小春 黄忠祥 刘秉光 |
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| 作者单位： | 中国科学院地质研究所，中国科学院高能物理研究所，中国科学院地质研究所，中国科学院高能物理研究所，中国科学院地质研究所 北京 100011，北京 100080，北京 100011，北京 100080，北京 100011 |
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| 摘 要： | 峨眉山玄武岩的微量元素丰度显示区域性差异,西岩区(盐源—丽江拗陷)玄武岩总体上比中、东岩区(康滇隆起和滇黔拗陷)玄武岩富相容元素而贫不相容元素,主要是因为它们的母岩浆经历的结晶分离的程度不同。比较演化的石英拉斑玄武岩、安山玄武岩往往富放射成因锶,反映其成因还涉及一定程度的地壳混染。相对主体拉斑玄武岩,东川碱性火山岩贫REE特别是LREE,推测源区发生过先期熔融事件。主要元素和REE的模拟计算表明,二滩粗面岩可以由玄武质母岩浆经分离结晶衍生,最可能的主要分离相是该区似层状辉长岩的矿物组合。
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| 关 键 词： | 玄武岩 微量元素 亲石元素 过渡金属元素 稀土元素 |
A PRELIMINARY STUDY ON TRACE ELEMENT GEOCHEMISTRY OF EMEISHAN BASALTS FROM SW CHINA |
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| Huang Kainian.A PRELIMINARY STUDY ON TRACE ELEMENT GEOCHEMISTRY OF EMEISHAN BASALTS FROM SW CHINA[J].Acta Petrologica Sinica,1988,4(4). |
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| Authors: | Huang Kainian |
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| Institution: | Huang Kainian~ |
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| Abstract: | The Emeishan basalts show a regional variation in trace element abundances which is characterized by the basalts from the Yanyuan-Lijing Depression being lower in incompatible elements but higher in compatible elements compared with those from the Kangdian Uplift and the Dian-Qian Depression. The difference is suggested to be primarily due to different degrees of crystallization experienced by their parental magmas. In addition, the more evolved andesitic basalts and quartz tholeiites are often rich in radiogenic Sr, indicating that to a certain extent crustal contamination was involved in the genesis of these rocks. Compared with the dominant tholeiites the alkaline volcanics from Dongchuan district are less enriched in LREE, probably resulting from earlier melting events in their source. Model calculations using both major and rare carth elements demonstrate that the trachytes from Ertan section could be derived from a basaltic parent via fractional crystallization, in which the optimum separated phases would be similar in composition to the mineralogy of the layered gabbros outcropping in the area investigated. |
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| Keywords: | Basalt Trace element Lithophile element Transition metal element Rare earth element |
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