摘要
在内蒙古凉城县北部和西部出露的变质深成侵入体,规模不一,总体近北东方向展布,多数呈零星岩株状,分布于古元古代二长花岗岩和花岗闪长岩内。针对脑包回前地区出露的变质深成侵入体,我们进行了详细研究,得出以下几个重要结论。第一,该岩体具有I型花岗岩特征。第二,该岩体的原岩岩石组合为辉长岩-辉长闪长岩-闪长岩,其中,以中性岩为主。第三,该岩体为偏铝质低钾钙碱-中钾钙碱-高钾钙碱性系列,符合火山弧或同构造花岗岩区和板内花岗岩岩石特征,因此,该岩体形成于碰撞-后碰撞环境。第四,对采集样品进行实验,结果表明,锆石LA-MC-ICPMS U-Pb同位素加权平均年龄为1935.5±9.3Ma,反映该岩体为古元古代产物。
The Metamorphic plutonic intrusions in different sizes distribute from north to east on the whole ,which is exposed in the north and west of Liang Cheng County in Inner Mongolia .The Metamorphic plutonic intrusions mostly strains in the shape of sporadic rock plant ,and it’s located in the monzonitic granite and granodiorite rocks of Paleoproterozoic Age .For the Metamorphic plutonic intrusions which is exposed in the region of Naobaohuiqian ,we conducted a detailed study ,and draw the following important conclusions .First ,the rock has the I-type granite characteristics .Second ,the combination of the original rocks of the rock is Gabbro-gabbro diorite-diorite ,which is mainly neutral rock .Third ,the rock belongs to metaluminous low-potassium calc-alkaline - middle-potassium calc-alkaline-high-potassium calc-alkaline series .Moreover ,it is consistent with the characteristics of volcanic arc or syn-tectonic granite region and slab granite rock .Therefore ,the rock is formed in the collision and post collision environment .Four ,It shows that the weighted average age of Zircon LA-MC-ICPMS U-Pb isotope is 1935 .5 ± 9 .3 Ma after the experiments of the collected sample rock .So the rock is the product of Paleoproterozoic Age .
出处
《中国矿业》
北大核心
2014年第S1期138-144,共7页
China Mining Magazine
