%0 Journal Article
%T Petrogenesis and its implication for the middle - late Jurassic intermediate-acidic volcanic rocks in the middle section of Yanshan orogen<br>燕山造山带中段中晚侏罗世中酸性火山岩的成因及其意义
%A LI WuPing
%A LI XianHua Institute of Civil Engineering
%A Cuangzhou University
%A Cuangzhou
%A China Guangzhou Institute of Geochemistry
%A Chinese Academy of Sciences
%A Guangzhou
%A China
%A <br>李伍平
%A 李献华
%J 岩石学报
%D 2004
%I 
%X 燕山造山带中段(冀北下板城)中晚侏罗世髫髻山组火山岩主要由粗安岩和粗面岩组成。火山岩具有高的SiO_2(>55％)、Al_2O_3(15.70％～17.55％)、Na_2O(3.79％～5.42％)、Na_2O K_2O(5.99％～9.38％)、CaO(2.31％～6.48％)和低的MgO(≤4.01％,Mg~#≤0.50),高Sr(428～816μg/g)及Na_2O/K_20比值(一般1.11～1.88),轻稀土元素富集,Sr/Y和Rb/Sr比值低。其中,粗安岩相对亏损重稀土元素(Yb_N<8.5,Y<19μg/g),Y/Yb(12.62～15.06)和(Ho/Yb)_N(1.23～1.50)比值较高,Eu负异常不明显(Eu/Eu~*=0.90～0.95),具有埃达克岩地球化学特征。我们认为髫髻山组粗安岩起源于大陆下地壳玄武质岩石的部分熔融,粗面岩为粗安岩浆结晶分异的产物。
%K Adakite
%K Trachyandesite-trachyte
%K Lower crust
%K Tiaojishan Formation
%K North Hebei Province
%K Yanshan Orogen<br>埃达克岩
%K 粗安岩-粗面岩
%K 下地壳
%K 髫髻山组
%K 冀北
%K 燕山造山带
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=431A6947C8CA10DA&yid=D0E58B75BFD8E51C&vid=A04140E723CB732E&iid=38B194292C032A66&sid=3054A11AD1D7E34A&eid=25467A5A28500A25&journal_id=1000-0569&journal_name=岩石学报&referenced_num=25&reference_num=111