烟台中部一对花岗岩体的岩石地球化学特征对比

院桥桩和皆山岩体是燕山期花岗岩类杂岩体。前者呈株状、岩体与围岩界线清晰，为似斑装花岗岩，亲铁元素富集，δＥｕ０．９１，是板缘岛弧同溶型花岗岩；后者为黑云母花岗岩岩基，具片麻状构造，含交代结构，亲减玫轻稀土元素富集，δＥｕ０．７８，为Ｉ＋Ｓ混合型花岗岩。

THE CONTRAST OF THE LITHOGEOCHEMICAL CHARACTERLSTICSBETWEEN TWO GRANLTE PLUTONS IN THE CENTRAL SECTION OF YANTAI

The Yuangezhuang and Zeshan rock plutons are granitic complex rocks of the period of the Yanshan Movement. The former is a porphyriticoid granite stock with the boundary line of the granite and the country rocks being clear. It is a type of plate edge syn-texis granite in which the siderophile elements are rich and Eu = 0. 91. The latter is a grantite batholith with gneissic stucture and metasomatic texture. It is a type of I + S granite in which the lithophile elements and LREE are rich and Eu = 0.78.