地质与资源2017，Vol.26Issue(6)：534-541,8.
大兴安岭中南段塔尔气地区满克头鄂博组火山岩地球化学特征及地质意义
THE VOLCANIC ROCKS IN MANKETOUEBO FORMATION FROM TAERQI AREA,SOUTH-CENTRAL DAXINGANLING MOUNTAINS:Geochemical Characteristics and Geological Implication
摘要
Abstract
The volcanic rocks in Manketouebo Formation from Taerqi area are mainly rhyolite,rhyolitic tufflava and rhyolitic crystal tuff.The analysis results of major elements indicate that the volcanic rocks are characterized by quasi aluminum-weak peraluminum,with Al2O3 =11.55％-14.76％ and A/CNK =1.01-1.35,rich alkali (Na2O+K2O =4.56％-8.79％) and poor calcium and magnesium.The average content of REEs in the volcanic rocks is 168.69×106.The distribution patterns show right-dipping curves with slight enrichment of LREEs and relatively fiat distribution of HREEs,with distinctive negative Eu anomaly (δEu=0.29-0.72) and Rb/Sr =0.3-11.4.The trace elements are obviously enriched in LILEs such as Rb,Ba and K,but depleted in HFSEs like Nb,Ta and Ti.Combined with the geochemical characteristics and previous research data,it is thought that the volcanic rocks in Manketouebo Formation,bearing the typical characteristics of crust-derived magma,with residual plagioclase or fractional crystallization of plagioclase in the magma source area,belong to A-type,which is possibly the product of lithosphere extension tectonic system after the closure of Mongolia-Okhotsk Ocean.关键词
满克头鄂博组/地球化学特征/塔尔气/大兴安岭Key words
Manketouebo Formation/geochemical characteristics/Taerqi area/Daxinganling Mountains分类
天文与地球科学引用本文复制引用
李尚启,李俊涛,朱小平,吴国学,刘雪松,李森林..大兴安岭中南段塔尔气地区满克头鄂博组火山岩地球化学特征及地质意义[J].地质与资源,2017,26(6):534-541,8.基金项目
中国地质调查局“内蒙古呼伦贝尔市阿木辉伊勒特等四幅区域矿产地质调查”项目(NMKD2008-02). （NMKD2008-02）
