山东东部花岗岩特征和成因的几点认识

SOME KNOWLEDGE ON THE CHARACTERISTICS AND GENESIS OF THE GRANITES IN EASTERN SHANDONG

摘要:

山东东部地区存在元古代和中生代花岗岩。元古代昆嵛山花岗岩是胶东群地层原地,半原地交代型花岗岩。大量的中生代花岗岩,由西向东大体上可分为三个带,并有如下规律:从西北向东南,时代由老变新,岩浆活动规模由小变大,岩石酸度由强变弱又变强,岩体都呈北东向互相平行的岩株状。三个花岗岩带与太平洋板块和菲律宾板块的毕鸟夫带大致平行。其推移方向与板块运动方向呈相反。各期次花岗岩的成岩作用,均是地壳先成的岩石重新熔化而形成的花岗岩浆上升侵入,故应属地壳重熔型(即S型)花岗岩。

Abstract:

There are Proterozoic and Mesozoic granites in Eastern Shandong. The Proterozoic Kunyushan granite belongs to the autochthonous—Parautochthonous one by metasomatism of the strata, the Jiaodong group, while the enormous amount of Mesozoic granites can generally be divided into three belts from west to east and follow the law below: from northwest to southeast, the eges of the granites become younger, the scale of magmatic activities increases, the acidity of the rocks increases and decreases, and increases a...