| 张广才岭北部苇河花岗岩基的地球化学特征与岩石成因 |
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| 引用本文： | 李蓉,孙德有,苟军,魏红艳,柳小明,武鹏飞,刘玮.张广才岭北部苇河花岗岩基的地球化学特征与岩石成因[J].世界地质,2012,31(3):462-470. |
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| 作者姓名： | 李蓉 孙德有 苟军 魏红艳 柳小明 武鹏飞 刘玮 |
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| 作者单位： | 1. 吉林大学地球科学学院，长春130061; 2. 西北大学大陆动力学国家重点实验室，西安710069 |
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| 基金项目： | 中国地质调查局项目“吉黑东部矿化集中区岩浆岩序列与地质成矿事件研究”（121201007030） |
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| 摘 要： | 张广才岭北部苇河花岗岩基的地质学、岩相学、全岩主量和微量及锆石Hf 同位素的详细解析显示: 苇河花岗岩基主体岩性为花岗闪长岩、二长花岗岩、正长--碱长花岗岩及少量的石英闪长岩和英云闪长岩，不同岩石类型之间呈侵入接触关系。岩石富硅富铝，为准铝质--弱过铝质岩石( A/CNK = 0. 97 ～ 1. 03) ，全碱( K2O + Na2O) 含量为6. 56% ～ 9. 10%，主要为高钾钙碱性系列I 型花岗岩。稀土和微量元素组成上，均富集LREE、Rb、Th、U、K、Hf，相对亏损Nb、Ta、P、Ti，δEu 从中等程度负异常到弱正异常。不均匀的锆石Hf 同位素成分( εHf ( t) = ( － 6. 68 ～ + 12. 13) ，TDM2 = 464 ～ 1 657 Ma) 表明，岩浆主体来源于显生宙--新元古代时期从亏损地幔中增生的基性下地壳物质，局部同化了更古老的地壳物质。
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| 关 键 词： | 苇河花岗岩基 地球化学 岩石成因 锆石Hf 同位素 |
Geochemistry and petrogenesis of Weihe granites batholith in northern Zhangguangcai range |
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| LI Rong
,
SUN De-you
,
GOU Jun
,
WEI Hong-yan
,
LIU Xiao-ming
,
WU Peng-fei
,
LIU Wei.Geochemistry and petrogenesis of Weihe granites batholith in northern Zhangguangcai range[J].World Geology,2012,31(3):462-470. |
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| Authors: | LI Rong SUN De-you GOU Jun WEI Hong-yan LIU Xiao-ming WU Peng-fei LIU Wei |
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| Institution: | 1. College of Earth Sciences，Jilin University，Changchun 130061，China; 2. State Key Laboratory of Continental Dynamics，Northwest University，Xi'an 710069，China |
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| Abstract: | The analysis of geology,petrography,major and trace elements,zircon Hf isotop data of Weihe granites batholith in northern Zhangguangcai range shows that the batholith is composed mainly of granodiorite,adamellite,orthoclase and aklali-feldspar granite with a few quartz diorite and tonalite.Intrusive contact relationship has been recognized among different rock types.Geochemical analysis shows that the granites are rich in silicon and potassium contents,belonging to quasi-aluminous and weakly peraluminous rocks（A/CNK=0.97~1.03）.The alkaline（K2O＋Na2O） is 6.56%~9.10% in contents,ascribed to high-K calc-alkaline series I-type granite.Rare and trace earth elements of the granites are rich in LREE,Rb,Th,U,K,Hf and depleted in Nb,Ta,P,Ti.Chondrite-normalized REE display moderate negative to slight positive Eu anomalies.Variable zircon Hf isotope composition（εHf（t）=（-6.68~＋12.13,TDM2=464~1 675 Ma） shows that the magma origrinated from the basic crusts which accreted from depleted mantle during the Phanarozoic and Neoproterozoic,and assimilated older crust locally. |
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| Keywords: | Weihe granite batholith geochemistry petrogenesis zircon Hf isotope |
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