王安镇岩体岩石地球化学特征及成因探讨

蔡剑辉,阎国翰,常兆山,王晓芳,邵宏翔,储著银. 王安镇岩体岩石地球化学特征及成因探讨[J]. 岩石学报, 2003, 19(1): 81-92.
引用本文: 蔡剑辉,阎国翰,常兆山,王晓芳,邵宏翔,储著银. 王安镇岩体岩石地球化学特征及成因探讨[J]. 岩石学报, 2003, 19(1): 81-92.
CAI JianHui,YAN GuoHan,CHANG ZhaoShan,WANG XiaoFang,SHAO HongXiang and CHU ZhuYin 1. Faculty of Earth and Space Sciences,Peking University,Beijing 100871,China2. Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China3. Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China. Petrological and geochemical characteristics of the Wanganzhen complex and discussion on its genesis.[J]. Acta Petrologica Sinica, 2003, 19(1): 81-92.
Citation: CAI JianHui,YAN GuoHan,CHANG ZhaoShan,WANG XiaoFang,SHAO HongXiang and CHU ZhuYin 1. Faculty of Earth and Space Sciences,Peking University,Beijing 100871,China2. Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China3. Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China. Petrological and geochemical characteristics of the Wanganzhen complex and discussion on its genesis.[J]. Acta Petrologica Sinica, 2003, 19(1): 81-92.

王安镇岩体岩石地球化学特征及成因探讨

  • 基金项目:

    地矿部直管局项目,国家教委博士点基金(99000141)

  • 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,
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修回日期:  2002-05-20
刊出日期:  2003-02-28

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