内蒙古获各琦地区海西期石英闪长岩中角闪石成因矿物学研究  

Genetic Mineralogy of Amphibole in Hercynian Quartz⁃diorite in Huogeqi Area,Inner Mongolia

作　　者：苏宝琪 郑义 梁晓姝 陈显玉 SU Bao-qi;ZHENG Yi;LIANG Xiao-shu;CHEN Xian-yu(Hebei GEO University,Shijiazhuang 050031,China)

机构地区：[1]河北地质大学,河北石家庄050031

出　　处：《河北地质大学学报》2020年第3期24-30,共7页Journal of Hebei Geo University

基　　金：河北地质大学第十五届学生科技基金项目(KAG009)。

摘　　要：论文选取获各琦地区石英闪长岩中角闪石为研究对象,通过电子探针分析,探讨角闪石形成的物理化学条件。研究表明,获各琦地区石英闪长岩中角闪石多为镁角闪石,角闪石的结晶温度约为788℃,结晶时的压力约为96 MPa,深度在2.2~5.0 km,为浅成侵入岩。锆石Hf同位素分析结果表明,εHf(t)介于-11.78^-0.77之间,对应的二阶段模式年龄介于1 352~2 044 Ma之间,结合石英闪长岩中角闪石地球化学特征,综合推断研究区内石英闪长岩成岩物质主要来源于下地壳,但有幔源物质混入。The amphibole from quartz diorite in the Huogeqi area was selected as the research object,and the physical and chemical conditions of the formation of amphibole were discussed by electronic probe analysis. The results of the electron microprobe analysis show that most of the amphiboles in the quartz diorite in various Huogeqi areas are magnesite,the crystallization temperature of the amphibole is about 788 ℃,the pressure during crystallization is about 96 MPa,and the depth is 2. 2~5. 0 km,is hypabyssal intrusive rock. The zircon Hf isotope analysis results show that εHf(t)is between-11. 78 to-0. 77,and the corresponding two-stage model age is between 1 352 to 2 044 Ma. Combined with the geochemical characteristics of amphibole in quartz diorite,comprehensive It is inferred that the diagenetic materials of quartz-diorite in the study area mainly originated from the lower crust,but mixed with mantle-derived materials.

关 键 词：获各琦地区 石英闪长岩 角闪石 成因矿物学 

分 类 号：P574.2[天文地球—矿物学]