摘要
宜丰地区燕山期花岗岩体位于九岭钨钼锡铜金多金属萤石高岭土成矿亚带,区内有瓷石矿(含锂)10余处。通过对区内大港、白市化山等燕山期花岗岩进行研究,认为早白垩世白水洞中-细粒(二长)花岗岩为瓷石矿(含锂)的赋矿岩石。燕山期花岗岩主量元素具有高SiO_(2)(70.01%~72.74%)、高Al_(2)O_(3)(14.75%~15.85%)、富Na_(2)O(2.21%~3.96%)、低CaO(0.07%~0.77%)和高铝饱合指数(A/CNK>1.25)的特征,属于高分异过铝质花岗岩;岩石稀土总量低(∑REE=3.30×10^(-6)~39.41×10^(-6)),轻重稀土分馏不明显,强烈Eu的负异常,富Cs、Rb、Ta、P等元素,亏损Ba、Nb、Ti等元素,与典型的S型花岗岩相似。上述燕山期花岗岩的特征说明,宜丰地区燕山期花岗岩属于高分异S型过铝质花岗岩,形成于同碰撞环境之下,是地壳泥质组分部分熔融的产物。
The Yanshanian granites in Yifeng area is located in Jiuling tungsten molybdenum tin copper gold polymetallic fluorite kaolin mineralization subzone,where holds more than 10 porclain stone deposits(lithium-bearing).Through a series of studies of Dagang and Baishihuashan porclain stone deposits(lithium-bearing),the ore-bodies are mainly hosted in the medium-fine grainedmuscovite granite of Early Cretaceous Baishuidong rock mass.The major elements of the Yanshanian granites show high SiO_(2)(70.01%—72.74%),Al_(2)O_(3)(14.75%—15.85%),Na_(2)O(2.21%—3.96%),low CaO(0.07%—0.77%),and high A/CNK(A/CNK>1.25),which indicates the granites belong to highly differentiated peraluminous granite;the rare earth elements show low∑REE(∑REE=3.30×10^(-6)—39.41×10^(-6)),slightly fractionation between light and heavy rare earth elements,and strong negative Eu anomalies,the trace elements are rich in Cs,Rb,Ta,P and depletion of Ba、Nb、Ti,which are similar to the S-type granite.In conclusion,the Yanshanian granites in Yifeng area are highly differentiated S-type peraluminous granite which are formed in a co-collision environment and originated from the partial melting of crustal argillaceous components.
作者
曾晓建
刘建伟
曾庆友
潘世语
张连湘
彭蜀涛
鲁诗阳
ZENG Xiaojian;LIU Jianwei;ZENG Qingyou;PAN Shiyu;ZHANG Lianxiang;PENG Shutao;LU Shiyang(Jiangxi Nonferrous Metal Geology and Mineral Resources Exploration and Exploitation Institute,Nanchang 330001,China;Yichun Mining Co.,Ltd.,Yichun Jiangxi 336000,China)
出处
《有色金属（矿山部分）》
2022年第4期128-136,共9页
NONFERROUS METALS(Mining Section）
关键词
燕山期花岗岩
瓷石矿(含锂)
地球化学
宜丰地区
江西
Yanshanian granites
proclain stone(Lithium-bearing)
geochemisty
Yifeng area
Jiangxi
作者简介
曾晓建(1967—),男,高级工程师,从事地质矿产勘查和技术管理工作;通信作者:刘建伟(1988—),男,工程师,博士,从事矿山地质、采矿及技术管理工作。
