地质与资源2025，Vol.34Issue(3)：265-276,290,13.DOI:10.13686/j.cnki.dzyzy.2025.03.001
大兴安岭伊勒呼里山中段正长花岗岩LA-ICP-MS锆石U-Pb年龄及地球化学特征
The syenogranite in the middle section of Yilehuli Mountain,Daxinganling Mountains:LA-ICP-MS zircon U-Pb age and geochemical characteristics
摘要
Abstract
The paper comprehensively studies the petrography,geochemistry,and LA-ICP-MS zircon U-Pb dating of the syenogranite in the middle section of Yilehuli Mountain.The results show that the syenogranite is characterized by high Si and rich alkali contents,poor Mg and Ca contents,and low FeOT/MgO ratio,belonging to quasialuminous-weakly peraluminous and high-K calc-alkaline series.The rock,with enriched LREEs,depleted HREEs and negative Eu anomaly,as well as enriched LILEs(Rb,Th,and K)and depleted HFSEs(Nb,Ta,Ti,and P)and LILEs(Ba,Sr,and La),is identified as a typical low Ba-Sr,highly fractionated Ⅰ-type granite,formed by partial melting of crustal materials.The LA-ICP-MS zircon U-Pb dating yields a weighted mean age of 143.90±1.20 Ma,indicating the early stage of Early Cretaceous.Combined with regional geological data,the pluton is the product of partial melting of crustal materials under the post-orogenic extensional setting within the Mongolia-Okhotsk Ocean tectonic domain,where the crustal delamination led to lithospheric thinning and upwelling of basic magma to contact with the crust.关键词
正长花岗岩/锆石U-Pb年龄/早白垩世/蒙古-鄂霍次克洋/伊勒呼里山Key words
syenogranite/zircon U-Pb age/Early Cretaceous/Mongolia-Okhotsk Ocean/Yilehuli Mountain/Daxinganling Mountains分类
天文与地球科学引用本文复制引用
韩宇,孙鹏志,马双,尹志刚,刘志学,李伯男,李海娜,陈骁帅..大兴安岭伊勒呼里山中段正长花岗岩LA-ICP-MS锆石U-Pb年龄及地球化学特征[J].地质与资源,2025,34(3):265-276,290,13.基金项目
中国地质调查局项目"黑龙江1∶5万1147高地(M51E004015)、工队(M51E004016)、1302高地(M51E005015)、1070高地(M51E005016)幅区域地质调查"(1212011120659). （M51E004015）
