| 苗儿山地区中生代酸性脉岩地球化学特征及其成因 |
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| 引用本文： | 李妩巍,陈卫锋,朱康任.苗儿山地区中生代酸性脉岩地球化学特征及其成因[J].铀矿地质,2011(6):337-344. |
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| 作者姓名： | 李妩巍 陈卫锋 朱康任 |
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| 作者单位： | 核工业230研究所;南京大学地球科学与工程学院; |
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| 摘 要： | 苗儿山地区中生代酸性脉岩主要为细粒白云母花岗岩和花岗斑岩,具有较高的Al2O3、K2O、Na2O含量和较低的TiO2、MgO含量,微量元素以富集Rb、Th、U、Ta而亏损Ba、Sr为特征,稀土元素总量偏低,轻稀土富集,Eu亏损强烈。在CaO/Na2O-Al2O3/TiO2和Rb/Sr-Rb/Ba图解上,酸性脉岩具有上地壳富黏土质泥岩的特征。这些特征与豆乍山、香草坪等岩体的地球化学特征相似,表明酸性脉岩与岩体的物质来源相同,即早期酸性花岗岩体的母岩浆滞留于地下深部,经一定程度分离结晶和固结后,晚期熔体沿花岗岩体内外接触带及断裂构造上升形成脉岩。强烈的分离结晶作用可以导致铀等成矿元素在残余熔体中的高度富集,为铀矿床的形成提供必要的物质基础。
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| 关 键 词： | 中生代酸性脉岩 地球化学 壳源型 岩石成因 |
Geochemical characteristics and genesis of Mesozoic acid dikes in Miaoershan area |
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| LI Wu-wei,CHEN Wei-feng,ZHU Kang-ren.Geochemical characteristics and genesis of Mesozoic acid dikes in Miaoershan area[J].Uranium Geology,2011(6):337-344. |
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| Authors: | LI Wu-wei CHEN Wei-feng ZHU Kang-ren |
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| Institution: | LI Wu-wei1,CHEN Wei-feng2,ZHU Kang-ren1(1.Research Institute 230,CNNC,Changsha,Hunan 410011,China,2.School of Earth Sciences and Engineering,Nanjing University,Nanjing,Jiangsu 210093,China) |
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| Abstract: | There are two types of Mesozoic acid dikes in Miaoershan area,granite-porphyry and fine-grained muscovite granite.The acid dikes are characterized with relatively higher content of Al2O3,K2O,Na2O,slightly lower content of TiO2,MgO,the enrichment of Rb,Th,U and Ta,depletion of Ba,Sr in trace elements,relatively low total REEs and enrichment in LREE with strong Eu depletion.In the CaO/Na2O-Al2O3/TiO2 and Rb/Sr-Rb/Ba diagram,the Mesozoic acid dikes belong to crust sourced type granite which is similar to Douzh... |
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| Keywords: | Mesozoic acid dikes geochemical characteristics crust sourced type rock genesis |
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