钦杭成矿带东段燕山期中酸性岩地球化学特征研究  

Geochemical characteristics of Yanshanian intermediate acid rocks in the eastern part of qinhang metallogenic belt

作　　者：陈宇宁 CHEN Yu-ning(Chaling No.1 middle school,Zhuzhou 412400,China)

机构地区：[1]茶陵县第一中学,湖南株洲412400

出　　处：《世界有色金属》2022年第10期124-126,共3页World Nonferrous Metals

摘　　要：为了研究燕山期中酸性岩地球化学特征,本文以钦杭成矿带东段燕山期中酸性岩为研究对象,从中选取21个具有代表性岩体的岩石地球化学数据,采用主微量二元图解、岩石类型、岩石系列划分、Harker投图以及埃达克岩判定等方法重点研究并概括带内燕山期中酸性岩浆的岩石地球化学特征。结果表明,样品中的主量元素Si、Al、Ca、Na、K均一定程度上受到热液蚀变的影响且钦杭成矿带东段燕山期中酸性岩石大部分总体属于高钾钙碱性-碱钙性-钙性-准铝-过铝质花岗闪长岩/花岗岩类,部分属于碱性-准铝-过铝质-碱性玄武岩/粗面安山岩类(包括其对应的火山岩)。In order to study the geochemical characteristics of Yanshan intermediate-acid rocks,this paper takes Yanshan intermediate-acid rocks in the eastern part of Qin-Hang metallogenic belt as the research object,selects the geochemical data of 21 representative rock bodies,and mainly studies and generalizes the geochemical characteristics of Yanshan intermediateacid magma in the belt by means of main and trace binary diagrams,rock types,rock series division,Harker projection and adakite determination.The results show that the major elements Si,Al,Ca,Na,K in the sample are all affected by hydrothermal alteration to a certain extent,and most of the Yanshan intermediate-acid rocks in the eastern part of Qinhang metallogenic belt belong to the high-potassium calc-alkalic calc-calcic-quasi-aluminum-peraluminous granodiorite/granite class,and some belong to the alkaline-quasi-aluminum-peraluminous-alkaline basalt/trachyandesite class(including its corresponding volcanic rocks).

关 键 词：钦杭成矿带东段 燕山期 中酸性岩 地球化学 

分 类 号：P588.1[天文地球—岩石学]