中国高分异花岗岩的地质特征及与钨多金属成矿作用  

Geological characteristics of high fractionated granite and its relationship with tungsten polymetallic mineralization

作　　者：陈瑜 刘龙 沈玉洁 CHEN Yu;LIU Long;SHEN Yujie(East China University of Technology,Nanchang 330000,Jiangxi,China;Gandong College,Fuzhou 344000,Jiangxi,China)

机构地区：[1]东华理工大学地球科学学院,江西南昌330000 [2]赣东学院,江西抚州344000

出　　处：《矿产勘查》2025年第1期92-107,共16页Mineral Exploration

摘　　要：高分异花岗岩为岩浆演化至晚期的产物,其鉴别特征及成矿作用是近年研究的热点。本文收集了中国范围内46个典型高分异花岗岩体的地球化学数据,分析高分异花岗岩的地质特征及其与钨多金属成矿作用的关系。结果表明:(1)高分异花岗岩以Zr/Hf、La/Ta、Y/Ho、La/Nb、K/Rb、LREE/HREE降低,较高的Rb/Sr和Rb/Ba比值为特征。(2)高分异I型花岗岩富含白云母、石榴石等矿物,SiO_(2)、A/CNK、P_(2)O_(5)、Zr+Nb+Ce+Y降低、Ga/Al-Zr具有降低的演化趋势;高分异S型花岗岩富含堇青石、红柱石等矿物,SiO_(2)、A/CNK、P_(2)O_(5)升高、Zr+Nb+Ce+Y降低;高分异A型花岗岩富含钠铁闪石等暗色矿物,Zr+Nb+Ce+Y下限值350×10^(-6)、成岩温度大于800℃、Ga/Al-Zr具有降低的线性演化趋势。(3)高分异花岗岩内因受黏度影响,外部受温度、构造、围岩等因素影响。(4)中国富钨多金属花岗岩主要集中于华南燕山期。High-resolution granite is the product of magmatic evolution to the late stage,and its identification characteristics and mineralization have been the focus of research in recent years.In this paper,the geochemical data of 46 typical high-metagranite bodies in China are collected,and the geological characteristics of high-metagranite and its relationship with tungsten polymetallic mineralization are analyzed.The results show that:(1)The high heteromorphism granite is characterized by decreasing Zr/Hf,La/Ta,Y/Ho,La/Nb,K/Rb,LREE/HREE,and higher Rb/Sr and Rb/Ba ratios.(2)High-resolution I-type granite is rich in minerals such as muscovite and gar⁃net,while SiO_(2)A/CNK,P_(2)O_(5),Zr+Nb+Ce+Y decrease,and Ga/Al-Zr has a decreasing evolution trend;High resolution S-type granite is rich in cordierite,andalusite and other minerals,while SiO_(2),A/CNK and P_(2)O_(5)increase and Zr+Nb+Ce+Y decrease.High-resolution A-type granite is rich in dark minerals such as albite.The lower limit of Zr+Nb+Ce+Y is 350×10^(-6),the diagenetic temperature is above 800℃,and Ga/Al-Zr has a decreasing linear evo⁃lution trend.(3)The high-resolution granite is influenced by viscosity internally and temperature,structure,sur⁃rounding rock and other factors externally.(4)Tungsten-rich polymetallic granites in China are mainly concentrated in Yanshanian period in South China.

关 键 词：高分异花岗岩 地质特征 钨多金属 成矿作用 

分 类 号：P588.12[天文地球—岩石学]