| 河南省商城埃达克质花岗岩地球化学特征及成因 |
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| 引用本文： | 张宏伟.河南省商城埃达克质花岗岩地球化学特征及成因[J].华南地质与矿产,2010(4):1-7. |
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| 作者姓名： | 张宏伟 |
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| 作者单位： | 中国地质大学(武汉)资源学院; |
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| 摘 要： | 河南信阳商城花岗岩体属于高钾钙碱性系列,具有岛弧花岗岩特征,其岩石地球化学具有与adakite岩相似的特征。这些岩石的SiO2含量均56%(67.32%~69.38%),Al2O3的含量除一个样品为14.92%外,其余均15%(15.03%~15.47%)、富含Na2O(3.5%~4.75%)、Na2OK2O,Na2O/K2O比值在1.1~1.4之间,具低MgO(1.10%~2.05%),低Cr(4.8×10-6~22×10-6)、Ni(1.7×10-6~5.6×10-6),具有高Sr(475.3×10-6~896.7×10-6,平均均400×10-6,平均为785.14×10-6),低Y(7.53×10-6~15.5×10-6,平均10.3×10-6,18×10-6),Sr/Y值40(平均84.4)、低Yb(0.58×10-6~1.55×10-6,平均0.87×10-6,1.8×10-6)。该花岗岩体在稀土元素配分曲线图上具有弱Eu负异常,稀土元素分异强烈,属轻稀土富集重稀土亏损;在微量元素蛛网图上具Ba、Sr正异常,而Nb、Ta的负异常较为明显。岩石类型为石英二长岩,花岗闪长岩、花岗岩。矿物成分以更长石、正长石、镁质黑云母、石英为主,副矿物为磁铁矿+榍石-锆石+磷灰石组合,富含暗色闪长质包体,属I型花岗岩类。表明商城埃达克质花岗岩形成可能与增厚下地壳熔融有关。
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| 关 键 词： | 高钾钙碱性系列 埃达克质岩 商城花岗岩类 |
Geochemical Characteristics and Petrogenesis of Adakitic Granite in Shangcheng Area, Henan Province |
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| ZHANG Hong-wei.Geochemical Characteristics and Petrogenesis of Adakitic Granite in Shangcheng Area, Henan Province[J].Geology and Mineral Resources of South China,2010(4):1-7. |
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| Authors: | ZHANG Hong-wei |
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| Institution: | ZHANG Hong-wei(Faculty of Earth Resources,China University of Geosciences,Wuhan 430074,China) |
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| Abstract: | Shangcheng granitic intrusion which is composition of quartz monzonite,granodiorite and granite rocks,belongs to I-type granitic rocks,has got major minerals of oligoclase,orthoclase,biotite and quartz,accessory minerals of magnetite + sphene or zircon + apatite,and dark dioritic enciave are rich in it.The geochemical characteristics of Shangcheng granitic intrusion are: SiO2 content of 67.32% ~ 69.38%,Al2O3 content of(14.92% ~ 15.47%),rich in Na2O(3.5% ~ 4.75%),Na2O>K2O,Na2O/K2O=1.1~1.42,low in MgO2(1.10% ... |
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| Keywords: | high-K calc-alkaline series adakitic granite Shangcheng granite intrusion Henan province |
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