云南富宁地区晚三叠世基性侵入岩年代学特征及其地质意义  

CHRONOLOGY AND GEOLOGICAL SIGNIFICANCE OF LATE TRIASSIC BASIC INTRUSIVE ROCKS IN FUNING AREA,YUNNAN PROVINCE

作　　者：李序贵 刘陈明[2] 李小军 李维科 晏海宝 马进华 LI Xu-gui;LIU Chen-ming;LI Xiao-jun;LI Wei-ke;YAN Hai-bao;MA Jin-hua(Yunnan Institute of Geological Survey,Kunming,650216;Yunnan Land and Resources Vocational College,Kunming,650093)

机构地区：[1]云南省地质调查院,云南昆明650216 [2]云南国土资源职业学院,云南昆明690093

出　　处：《云南地质》2024年第S01期182-187,共6页Yunnan Geology

基　　金：中国地质调查局项目《云南1:5万那佐幅、里往幅、大普弄幅、花甲幅(G48E024014、G48E024015、G48E001014、G48E001015)4幅区域地质调查》(编号:121201010000150008—09)。

摘　　要：笔者在云南富宁地区新厘定出一套基性侵入岩,为讨论该侵入岩年代学特征及其地质意义,对位于富宁县花甲乡一带的侵入岩进行了高精度的锆石U-Pb年代学及地质学研究。结果表明:该侵入岩^(206)Pb/^(238)U年龄196.8Ma~229.26Ma,最终获得206.8±5.3Ma的加权平均年龄值,为晚三叠世岩浆活动的产物,该侵入岩形成时代明显晚于峨眉山大火成岩省主喷发期,不属于同期火山活动。A set of basic intrusive rocks was newly determined in Funing area,Yunnan Province.In order to discuss the chronological characteristics and geological significance of the intrusive rocks,a high-precision zircon U-Pb chronology and geological research was carried out on the intrusive rocks located in Huajia Township,Funing County.The results show that the ^(206)Pb/^(238)U age of the intrusive rock is 196.8Ma~229.26Ma,with a weighted average age of 206.8±5.3Ma,which is the product of the late Triassic magmatic activity.The formation age of this intrusive rock is obviously later than the main eruption period of the Emeishan large igneous rock province,which does not belong to the same period of volcanic activity.

关 键 词：火山岩 辉绿岩 锆石U-PB年龄 晚三叠世 云南富宁 

分 类 号：P597[天文地球—地球化学]