浙江省燕山期花岗岩化学元素丰度及特征  

Abundances of elements of Yanshanian granitoids in Zhejiang Province and their characteristics

作　　者：钱建民 华杰雄 QIAN Jianmin;HUA Jiexiong(Institute of Geophysical and Geochemical Exploration of Zhejiang Province,Hangzhou 310005,Zhejiang,China;Suichang gold mine Co.,Ltd.of Zhejiang,Lishui 323304,Zhejiang,China)

机构地区：[1]浙江省地球物理地球化学勘查院,浙江杭州310005 [2]浙江省遂昌金矿有限公司,浙江丽水323304

出　　处：《矿产勘查》2022年第11期1581-1602,共22页Mineral Exploration

基　　金：浙江省地勘资金[2012001]资助。

摘　　要：本研究从浙江省87个燕山期花岗岩体中系统采集了189件样品,采用等离子体光谱法等11种分析方法,获得了Ag、As、Au、B、Ba、Be、Bi、Br、Cd、Cl、Co、Cr、Cs、Cu、F、Ga、Ge、Hf、Hg、I、In、Li、Mn、Mo、N、Nb、Ni、P、Pb、Rb、S、Sb、Sc、Se、Sn、Sr、Ta、Te、Th、Ti、Tl、U、V、W、Zn、Zr、La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu、Y、SiO_(2)、Al_(2)O_(3)、TFe_(2)O_(3)、MgO、CaO、K_(2)O、Na_(2)O共68项主量、微量、稀土元素值以及TC、pH的实测数据,计算了扬子板块东缘与华南造山带燕山期花岗岩的化学元素丰度。岩石地球化学特征显示,这些花岗岩为高硅、富碱、弱过铝质的高钾钙碱性花岗岩,具有较强的Eu负异常,富集Rb、Th、U、K,亏损Sr、Ba、P、Ti、Nb、Ta等元素的特征,其普遍富铝和低MgO含量的岩石化学特征,指示它们的岩浆源区以壳源为主。This study collected 189 rock samples from 87 Yanshanian granitoids in Zhejiang Province(eastern Yangtze plate-South China Orogen)and analyzed for 68 kinds of elements including Ag,As,Au,B,Ba,Be,Bi,Br,Cd,Cl,Co,Cr,Cs,Cu,F,Ga,Ge,Hf,Hg,I,In,Li,Mn,Mo,N,Nb,Ni,P,Pb,Rb,S,Sb,Sc,Se,Sn,Sr,Ta,Te,Th,Ti,Tl,U,V,W,Zn,Zr,La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu,Y,TC,SiO_(2),Al_(2)O_(3),TFe_(2)O_(3),MgO,CaO,K_(2)O,Na_(2)O and pH by XRF and INAA dominantly as well as other 9 kinds of analysing methods.The average chemical compositions and element abundances of about 70 chemical elements in eastern Zhejiang Province.It is sufficiently discussed on the characteristics of petrochemical parameters,trace element contents and rare earth element distributions of granitoids in Zhejiang Province.Results of geochemical analyses show that granites rocks are high-potassium calc-alkaline granite,with enriched SiO_(2),total alkalis,and weakly-peraluminous nature;they are enriched in Rb,Th,U and K and depleted in Sr,Ba,P,Ti,Nb and Ta with strong negative Eu anomaly.Combined with the petrochemistry characteristics of high Al but low MgO content,it indicates that the magma originated from crustal source.

关 键 词：燕山期 化学元素丰度 钙碱性花岗岩 壳源 扬子板块 华南造山带 

分 类 号：P595[天文地球—地球化学]