摘要
四川省西南部广泛分布着晚二叠世峨眉山玄武岩,玄武岩浆喷发主要受攀西断裂带及次级构造控制,在盐源、米易一带为海相及海陆交互相玄武岩分布区,以溢流式喷发为主,形成若干个喷发韵律层,在空间上形成厚度巨大的玄武岩系,是纤维用玄武岩的理想基地。本文选择峨眉山玄武岩出露面积广、分布厚度大、交通便利的7个县域,通过开展路线地质剖面调查的方式,经采样分析,在盐源县发现的玄武岩主量元素特征为:w(SiO2)=53.00%,w(Al2O3)=14.58%,w(CaO)=8.43%,w(MgO)=5.07%,w(Fe2O3+FeO)=10.35%,w(K2O+Na2O)=4.36%,w(TiO2)=1.62%;在米易县发现的玄武岩主量元素特征为:w(SiO2)=51.55%,w(Al2O3)=13.62%,w(CaO)=6.87%,w(MgO)=5.78%,w(Fe2O3+FeO)=11.33%,w(K2O+Na2O)=3.56%,w(TiO2)=2.42%,二者化学成分均符合纤维用玄武岩工业指标,厚度分别为900m和823m,蕴藏资源储量巨大,有着十分广阔的开发利用价值,对四川省玄武岩纤维产业发展起积极推动作用。
The Late Permian Emeishan basalts are widely distributed in the southwestern part of the Sichuan Province.The basaltic magma was ascended principally along the Panxi fracture zone and sub-ordinary fractures,erupted mainly as flooded phase,and distributed in forms of marine and marine-continental interbedded basalt phases in the Yanyuan and Miyi counties,with several eruptive rhythmic cycles.These very thick bedded basalts are ideal for producing basaltic fibers.In this study,the Emeishan basalts distributed in large area and great thickness in seven counties with convenient transportation have been selected to carry out route geological profile investigation,sampling,and chemical analysis.The results show that major elements of basalts in Yanyuan County are composed of 53.00%SiO2,14.58%Al2O3,8.43%CaO,5.07%MgO,10.35%Fe2O3+FeO,4.36%K2O+Na2O,and 1.62%TiO2,and those of basalts in Miyi County are composed of 51.55%SiO2,13.62%Al2O3,6.87%CaO,5.78%MgO,11.33%Fe2O3+FeO,3.56%K 2O+Na2O,and 2.42%TiO2.Chemical compositions of these basalts are consistent with the industrial standard of fiber-produced basalt.The great thicknesses of them(900 m and 823 m,respectively)imply that they have spectacular reserve with extensively exploitable and applicable values.It will play an active role in promoting the development of basalt fiber industry in Sichuan Province.
作者
王跃忠
WANG Yue-zhong(Hydro-Engineering Party of Sichuan Metallurgical Geology&Exploration Bureau,Chengdu 611730,China)
出处
《矿物学报》
CAS
CSCD
北大核心
2019年第6期664-672,共9页
Acta Mineralogica Sinica
基金
四川省地质勘查基金项目(批准号：201701)
关键词
峨眉山玄武岩
纤维用玄武岩
主量元素
四川省西南部
Emeishan basalt
fiber-produced basalt
major elements
southwestern part of the Sichuan Province
