摘要
王家店花岗岩体主要由二长花岗岩组成,含原生白云母,属铝过饱和系列,ANKC>1.05,Cr、Sr、Zr、Ba、U、Th、Rb、Ta、Hf含量较低;富轻稀土元素,铕异常明显,氧同位素大于10。属S型花岗岩。其锆石一致曲线年龄117Ma。其形成是受太平洋板块俯冲影响,引起陆壳富铝质岩石部分熔融的结果。
According to our study on geology, petrology and geochemistry, we get the conclusion that the Wangjiadian granite is of 'S' type granite. The intrusion is mainly composed of a single facies (admellite) with slight texture change from the rim to centre. Primary muscovite could be found. The ANCK value are more than 1.05, and δO^(18), more than 10. REE patterns are LREE-rich type with slight Eu-negative anomaly. The contents of Cr, Sr, Zr, Ba, U, Th, Rb, Ta and Hf are lower than Vinogradov (1962) average values, that means the Wangjiadian granite was generated from those kinds of rocks that also have lower contents of those elements. Through our study, we think the Wangjiadian granite may be generated from the partial melting of the TTG rocks in the studied area. Its U-Pb age is 117±3.5Ma. The formation of the granite may be related to the plate tectonic movements between Pacific and Sino-Korean plate.
出处
《吉林地质》
1991年第3期24-35,共12页
Jilin Geology
关键词
花岗岩
地球化学
成因
吉林
S型
Wangjladian Yanshan period Monzonite granite S-type
