广州北部黄鹿嶂地区矿床地球化学特征及U-Pb年龄研究  

Geochemical characteristics and U-Pb age of deposits in huangluzhang area,northern Guangzhou

作　　者：叶升明 李锐 何翔 YE Sheng-Ming;LI Rui;HE Xiang(Guangdong Geological Survey,Guangzhou 510080,China)

机构地区：[1]广东省地质调查院,广东广州510080

出　　处：《世界有色金属》2021年第18期217-218,共2页World Nonferrous Metals

摘　　要：粤中黄鹿嶂地区发育有大量的燕山期火山岩,前人对此研究程度不高[1]。本文对该地区火山岩进行了较为系统的地球化学分析及同位素测年测试,研究结果显示,调查区火山岩为高钾钙碱性系列岩石;相对富集Rb、Th、La、Nd、Hf、Y元素,相对亏损Ba、Nb、Sr、P、Ti、Yb元素;稀土元素总量(ΣREE)为495.63×10^(-6),轻重稀土比值(ΣCe/ΣY)为11.32,La_(N)/Yb_(N)值为16.57,Eu亏损程度(δEu)为0.09,Ce亏损程度(δCe)为0.98,属于轻稀土富集型;LAICP-MS锆石U-Pb定年结果为136.76±0.99Ma,属于早白垩世。其构造环境经历了稳定-造山-造山后的拉张环境。There are a lot of yanshanian volcanic rocks in Huangluzhang area in Central Guangdong province.In this paper,a systematic geochemical analysis and isotopic dating test of the volcanic rocks in this area are carried out.The results show that the volcanic rocks in this area are of high k calc-alkaline series.They are enriched in Rb,Th,La,Nd,Hf,Y elements and depleted in Ba,Nb,Sr,P,Ti,Yb elements.The total amount of rare earth elements(ΣREE)is 495.63×10^(-6),the ratio of light and heavy rare earth elements(ΣCe/ΣY)is 11.32,the La_(N)/Yb_(N) value is 16.57,the Eu depletion degree(δEu)is 0.09,and the Ce depletion degree(δCe)is 0.98.LA-ICP-MS zircon U-Pb dating results of 136.76±0.99Ma,belonging to the Early Cretaceous.The tectonic environment experienced a stable-orogenic-post-orogenic extensional environment.

关 键 词：火山岩 地球化学 同位素测年 黄鹿嶂地区 

分 类 号：P618.51[天文地球—矿床学]