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地质学报  2010 

河北兴隆王坪石正长花岗岩体地球化学特征及成因研究

, PP. 682-693

Keywords: 河北兴隆,正长花岗岩,Sr-Nd-Pb同位素,壳幔混合

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Abstract:

王坪石岩体具有超酸性(w(SiO2)=73~76%)、SiO2过饱和(大量石英)、偏铝质到弱过铝质(w(Al2O3)=12.48~14.23wt%)和碱性(w(Na2O+K2O)=7.83~9.41%)的特征。总稀土较低(ΣREE=(54.41~140.21)×10-6),稀土配分型式为左陡右缓的轻稀土元素富集、重稀土元素亏损型。微量元素富集K、Pb等大离子亲石元素以及Rb、Th、U等强不相容元素,相对亏损Ba、La、Ce等大离子亲石元素和Nb、Ta、P、Ti等高场强元素。Sr-Nd-Pb同位素地球化学研究表明,该岩体的(87Sr/86Sr)i较低(0.70498~0.70503),εNd(t)为负值(-10.9~-12.1),以上特征结合岩浆混合的证据表明,该岩体的物质来源主要为下地壳古老变质岩(变质硬砂岩),但受到地幔端员的混染作用。

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