%0 Journal Article
%T Petrological and geochemical characteristics of the Wanganzhen complex and discussion on its genesis.<br>王安镇岩体岩石地球化学特征及成因探讨
%A CAI JianHui
%A YAN GuoHan
%A CHANG ZhaoShan
%A WANG XiaoFang
%A SHAO HongXiang
%A CHU ZhuYin Faculty of Earth
%A Space Sciences
%A Peking University
%A Beijing
%A China Institute of Mineral Resources
%A Chinese Academy of Geological Sciences
%A Beijing
%A China Institute of Geology
%A Geophysics
%A Chinese Academy of Sciences
%A Beijing
%A China
%A <br>蔡剑辉
%A 阎国翰
%A 常兆山
%A 王晓芳
%A 邵宏翔
%A 储著银
%J 岩石学报
%D 2003
%I 
%X 王安镇岩体是我国东部太行山-大兴安岭中生代构造岩浆带中规模最大、岩石类型最多的代表性岩体之一,该岩体由早期、主期和晚期三期岩石组成。本文通过对王安镇岩体三期岩石主量元素、稀土元素、微量元素和Sr、Nd、Pb同位素的系统研究,发现该岩体主期岩石(花岗闪长岩、二长花岗岩和少量石英闪长岩)具有与埃达克岩类似的独持的岩石地球化学特征:SiO_2≥56％,Al_2O_3≥15％,低Y(4.20～12.68μg/g)而高Sr(518～861μg/g)和Sr/Y值(60.19～178.10),LREE强烈富集(La/Yb)_N=34.06～76.91,HREE强烈亏损Yb=0.44～1.00,Sr、Eu无明显异常,高场强元素(如Nb,Hf和Ti)相对亏损,I_(Sr)值为0.7060,ε_(Nd)(t)均为负值(-16.29～-14.27),ε_(Sr)(t)均为正值(+23.7～+25.0),应属于埃达克质岩,但又与俯冲板片熔融形成的埃达克岩的地球化学组成明显不同,推测可能是由于晚中生代区域内热地幔物质是“蘑菇云”状上涌,使热侵蚀面抬升到地壳底部,导致玄武质下地壳在高压下发生部分熔融的产物。而早期和晚期岩石则属于非埃达克质岩,早期为基-中性岩石(角闪石岩、辉长岩和闪长岩),富Mg、Fe,LREE富集,Eu呈正异常,富集相容元素而亏损不相容元素,I_(Sr)=为0.7056,ε_(Nd)(t)=-16.72～-10.92,推测是华北地台岩石圈富集地幔部分熔融的产物,
%K Petrological and geochemical characteristics
%K Genesis
%K Adakite-like rock
%K Sr
%K Nd and Pb isotopes
%K Rb-Srisochron age
%K the Wanganzhen complex<br>岩石地球化学特征
%K 埃达克质岩
%K 成因
%K Rb－Sr等时线年龄
%K 铅同位素
%K 锶同位素
%K 钕同位素
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=8595B3E3978F907C&yid=D43C4A19B2EE3C0A&vid=2A8D03AD8076A2E3&iid=CA4FD0336C81A37A&sid=35FC3610259C2B32&eid=08805F9252973BA4&journal_id=1000-0569&journal_name=岩石学报&referenced_num=19&reference_num=63