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| 龙王(石童)A型花岗岩地球化学特征及其地球动力学意义 | |
| 引用本文： | 包志伟,王强,资锋,唐功建,杜凤军,白国典.龙王(石童)A型花岗岩地球化学特征及其地球动力学意义[J].地球化学,2009,38(6). |
| 作者姓名： | 包志伟 王强 资锋 唐功建 杜凤军 白国典 |
| 作者单位： | 1. 中国科学院,广州地球化学研究,所成矿动力学实验室,广东,广州,510640 2. 中国科学院,广州地球化学研究所,同位素年代学与地球化学重点实验室,广东,广州,510640 3. 河南地质调查院,河南,郑州,450007 |
| 基金项目： | 国家自然科学基金(40672070,40472032);;国家重点基础研究发展计划项目(2006CB403504) |
| 摘 要： | 龙王花岗岩岩体产于华北克拉通南缘,岩石类型主要为黑云母钾长花岗岩,局部见有霓辉石花岗岩。岩体高硅(SiO2=72.17%～76.82%)、富碱(K2O+Na2O=8.28%～10.22%,K2O/Na2O>1),碱性指数AI(agpaitic index)=0.84～0.95,分异指数DI=95～97,铝指数ASI(aluminium saturation index)=0.96～1.13。含铁指数高(FeO/(FeO+Mg)=0.90～0.99),岩石为准铝质至弱过铝质、碱性—碱钙性、铁质A型花岗岩。岩石富集大离子亲石元素,稀土元素含量很高(854～1572μg/g);高场强元素(Nb、Ta、Zr、Hf)的富集程度明显低于大离子亲石元素,因此在微量元素蛛网图上呈相对亏损特征;岩石显著亏损Ba、Sr、Ti、Pb;εNd(t)=-4.5～-7.2,Nd模式年龄为2.3～2.5Ga。εHf(t)=-1.11～-5.26,模式年龄tHf1=2.1～2.3Ga,tHf2=2.4～2.6Ga。黑云母钾长花岗岩中的锆石主要为无色透明柱状晶体,CL图像多数显示清晰的岩浆成因的韵律环带结构,锆石LA-ICPMSU-Pb年龄为... |
| 关 键 词： | A型花岗岩 微量元素 同位素 地球化学 元古宙 Columbia超大陆 |
Geochemistry of the Paleoproterozoic Longwangzhuang A-type granites on the southern margin of North China Craton:Petrogenesis and tectonic implications |
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| BAO Zhi-wei,WANG Qiang,ZI Feng,TANG Gong-jian,DU Feng-jun,BAI Guo-dian.Geochemistry of the Paleoproterozoic Longwangzhuang A-type granites on the southern margin of North China Craton:Petrogenesis and tectonic implications[J].Geochimica,2009,38(6). | |
| Authors: | BAO Zhi-wei WANG Qiang ZI Feng TANG Gong-jian DU Feng-jun BAI Guo-dian |
| Institution: | BAO Zhi-wei1,WANG Qiang2,ZI Feng2,TANG Gong-jian2,DU Feng-jun3 , BAI Guo-dian3 1.Key Laboratory for Metallogenic Dynamics,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China,2.Key Laboratory of Isotope Geochronology , Geochemistry,3.Henan Institute of Geological Survey,Zhengzhou 450007 |
| Abstract: | The Longwangzhuang A-type granites occur in the southern margin of the North China Craton and mainly consist of biotite K-feldspar granite,and locally distributed aegirine granite.The granites are characterized by high silicon and alkaline contents(SiO2=72.17%-76.82%,K2O+Na2O=8.28%-10.22%,K2O/Na2O > 1),AI(agpaitic index)=0.84-0.95,DI=95-97,ASI(aluminum saturation index)=0.96-1.13,very high Fenumber(FeO/(FeO+Mg)=0.90-0.99),thus,the granites are of metaluminous to weakly prealuminous,alkalic to calc-alkalic f... |
| Keywords: | A-type granite trace elements isotope geochemistry Proterozoic Columbia |
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