内蒙古宝音图一带中元古代A型花岗岩特征及形成环境

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中图分类号：P56 文献标识码：A 文章编号：2097-5465（2025）04-0012-08

Abstract：The BaoyintuProterozoicA-typegranitesarelocatedintheBaoyintu-Qiandamenarea.Inthispaper，itisconsidered that the monzogranite is rich in silicon （ SiO2 content 75 5.7%～78.6% ）and poor in calcium（CaO content 0.27%～1.06% ）， andisrichinNb，Y，Zr，lowAl，Mg，Ca，N，Cr，TindhasastrongnegativeEuanomaly，whichisobviouslydiernfro thehighly differentiatedI-type S-typegranites，and isconsistent with the characteristics A1 -type granites.Combining the regionalgeologicalbackground，itisconsideredthatthemonzogranitefoedinanintraplatenvironment.Tematerialth granitesistheuppermantle.ItsformedinriftenvironmenttheNorthmarginmidleProterozoicrift，whichthematerial source is relatively deep.The material graniteare mantle source or crust-mantle mixed source.

Keywords：A-type granite；Baoyintu；Middle Proterozoic

来稿日期：2025-02-12 DOI：10.13937/j.cnki.hbdzdxxb.2025.04.002

基金项目：河北省自然资源厅矿产普查项目（13000023P00F2D410332N，13000025P00F2D410671B）；中国地质调查局项目（1212011120708）

作者简介：倪克庆（1973—），男，河北廊坊人，高级工程师，主要研究方向为基础地质、矿床地质调查研究工作。（剩余6650字）