北山造山带东部微波山早志留世S型花岗岩成因及构造背景  

Genesis and tectonic setting of Early Silurian S-type granite in the Weiboshan area of the eastern Beishan orogenic belt

作　　者：郭明星 匡永生 邵博群 王霞霞 王湘君 杨志杰 GUO Mingxing;KUANG Yongsheng;SHAO Boqun;WANG Xiaxia;WANG Xiangjun;YANG Zhijie(School of Resources and Environmental Engineering,Inner Mongolia University of technology,Hohhot 010051,China)

机构地区：[1]内蒙古工业大学资源与环境工程学院,呼和浩特010051

出　　处：《内蒙古工业大学学报（自然科学版）》2024年第2期137-145,共9页Journal of Inner Mongolia University of Technology：Natural Science Edition

基　　金：国家自然科学基金项目(41673039);内蒙古自治区自然科学基金项目(2020LH04001);内蒙古工业大学科学研究项目(ZZ201911)。

摘　　要：为研究北山造山带东部微波山地区的大地构造背景,选取在该地区广泛发育的花岗岩为研究对象,通过野外地质工作、锆石U-Pb年代学、岩石学及地球化学等研究方法,深入剖析了微波山花岗岩的形成时代、类型、成因及构造背景。锆石年龄为(440.80±0.19)Ma和(155.05±0.37)Ma,表明该岩体形成于早志留世,并在侏罗世形成复式岩体。岩石学特征定名本次样品为二长花岗岩,地球化学特征显示成因类型为S型花岗岩,稀土配分曲线与微量元素蛛网图为右倾型,显示岛弧岩浆岩特征。根据Yb、Y、Sr、Al_(2)O_(3)的含量特征确定其中两个样品为埃达克岩,建立微波山构造-岩浆演化模型,早志留世小黄山洋盆向北俯冲,幔源岩浆底侵,长英质岩浆移出形成岛弧岩浆岩。To study the tectonic background of the Weiboshan area in the eastern part of the Beishan orogenic belt,granite,which is widely developed in this area,was selected as the research object.Through field geological work,zircon U-Pb geochronology,petrology,and geochemistry,the formation age,type,petrogenesis,and tectonic background of the Weiboshan granite were deeply analyzed.The zircon ages are(440.8±0.19)Ma and(155.05±0.37)Ma,indicating that the Weiboshan granite was formed in the Early Silurian and formed a composite granite body in the Jurassic.The samples are named monzonitic granite based on petrological characteristics;geochemical characteristics demonstrate that the genetic type is S-type granite.The rare earth distribution curve and trace element spider diagram are right-leaning,showing the characteristics of island arc magmatic rocks.According to the content characteristics of Yb,Y,Sr and Al_(2)O_(3),it is determined that two of the samples are adakite.The tectonic-magmatic evolution model of Weiboshan is established:the Xiaohuangshan oceanic basin subducted northward in the Early Silurian,the mantle-derived magma intruded,and the felsic magma moved out to form island arc magmatic rocks.

关 键 词：北山造山带 早志留世 S型花岗岩 埃达克岩 

分 类 号：P581[天文地球—岩石学] P588.121[天文地球—地质学]