油山岩体位于赣南—粤北地区,是大庾岭的重要组成部分,也是南岭地区代表性的花岗岩岩体.但是,对其地质特征、成岩时代、构造背景及其成矿专属性研究程度相对较低.文章在野外调研的基础上,对油山岩体中心部位的中细粒板状黑云母花岗岩样品进行了初步研究,利用激光剥蚀-多接收器电感耦合等离子体质谱法(LA-MC-ICPMS)测定其成岩时代,确定其形成年龄有两个峰值,即236.5Ma和437.8Ma.该结果表明油山岩体确实属于复式岩体,并且经历的地质历史主要是加里东期和印支期,而不是以往认为的燕山期.%The Youshan-Maotouzai rock body, located in the South Jiangxi-North Guangdong area, is an important part of the Dayu Mountains and a representative granite pluton in the Nanling region. However, studies of its geological features, petrogenic chronology, tectonic and metallogenic specialization are relatively few. In this study, based on detailed field research, Laser Ablation-Multicollector Inductively Coupled Plasma-Mass Spectrometry (LA-MC-ICP-MS) was used to detect the formation age of the Youshan-Maotouzai complex. The test results show two peak ages for the magmatism of the Youshan pluton, 236.5 Ma and 437.8 Ma, which indicate that the Youshan rock body is a complex pluton and is mainly formed by the two magmatic events of the Caledonian period and the Indo-Sinian period, but not the Yanshanian period, as the previous study suggested.
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