地质与资源2025，Vol.34Issue(1)：1-10,102,11.DOI:10.13686/j.cnki.dzyzy.2025.01.001
小兴安岭北段林海林场花岗岩年代学、地球化学特征及构造意义
Geochronology and geochemistry of granites in Linhai forest farm,northern Xiaoxinganling Mountains:Tectonic implication
摘要
Abstract
A series of highly fractionated I-type granites,mainly composed of marginal facies fine-grained monzogranite and central facies fine-medium-grained monzogranite,is developed in Linhai forest farm area of the Xiaoxinganling-Zhangguangcailing mountains.The granites are characterized by high Si and total alkali(Na2O+K2O),rich Al,and poor Fe,Mg,Ca and Ti,belonging to quasi-aluminous,high-K calc-alkaline series,with enriched LILEs and LREEs,depleted HFSEs,and moderately strong negative Eu anomaly.The LA-ICP-MS zircon U-Pb age results show that the granites were formed at 191.6±2.9 Ma.According to the geochemical compositions,it is considered that the granites are mainly derived from the partial melting of shallow continental crust materials in Early Mesozoic.The discovery of highly fractionated I-type granites indicates that large-scale magmatic intrusion occurred in the Early Jurassic,which may be closely related to the regional extensional environment under the westward subduction of paleo-Pacific plate.关键词
早侏罗世/花岗岩/地质年代学/地球化学/构造背景/小兴安岭/张广才岭Key words
Early Jurassic/granite/geochronology/geochemistry/tectonic setting/Xiaoxinganling/Zhangguangcailing分类
天文与地球科学引用本文复制引用
牟福权,许国雨,卢鸿雁,崔雪文,常亮,娄雨雷,祁迎圣,邱信东..小兴安岭北段林海林场花岗岩年代学、地球化学特征及构造意义[J].地质与资源,2025,34(1):1-10,102,11.基金项目
黑龙江省国土资源厅项目"黑龙江省逊克县福民林场、永胜经营所幅1∶5万区域地质矿产调查"(HLJKD2006-10). （HLJKD2006-10）
