北淮阳地区不同变形-变质煤的元素分布及其影响因素

李小明; 曹代勇; 占文峰

北淮阳地区不同变形-变质煤的元素分布及其影响因素

Elements distribution and effecting factors of high rank coals of different deformational-metamorphic types in Beihuaiyang area

摘要

摘要: 通过对大别造山带前陆北淮阳地区石炭纪高煤级煤的X射线荧光光谱分析,探讨了不同变形-变质类型煤中常量元素的分布规律及其影响因素。结果表明:构造-热作用具有使Al³⁺、K⁺、Si⁴⁺、Ti⁴⁺在煤体中富集,P⁵⁺、Fe²⁺+Fe³⁺、Mn²⁺Na⁺、Ca²⁺、Mg²⁺向煤体外迁移的趋势;在弱应力带富集Al³⁺、K⁺、Ti⁴⁺、Na⁺、Ca²⁺;在强应力带富集Si⁴⁺、P⁵⁺、Fe²⁺+Fe³⁺、Mg²⁺。岩浆热变质类型煤和构造-热变质类型煤的w(SiO₂)/w(Al₂O₃)和w(K₂O)/w(Na₂O)值显著增大,与岩浆岩中SiO₂及K₂O质量分数偏高有重要的成因联系。

Abstract: Based on the X-Ray Fluorescence Spectrometry (XRF) analysis on Carboniferous coal occured in Beihuaiyang area,the northern foreland basin of Dabie Orogenic Belt,the major elements distribution characters and the effecting factors of high rank coals of different deformational-metamorphic types are discussed.The results show that the tectonic-thermal process made Al³⁺,K⁺,Si⁴⁺,Ti⁴⁺ concentrated in coal,but P⁵⁺,Fe²⁺+Fe³⁺,Mn²⁺,Na⁺,Ca²⁺,Mg²⁺ migrated outside. Otherwise,Al³⁺,K⁺,Ti⁴⁺,Na⁺ and Ca²⁺ were abundant in weak stress zones,but Si⁴⁺,P⁵⁺,Fe²⁺+Fe³⁺ and Mg²⁺ abundant in strong stress zones.The values of SiO₂/Al₂O₃ and K₂O/Na₂O in tectonic-thermal metamorphic coal and telemagmatic metamorphic coal were larger than those in regional metamorphic coal,which might be related to the higher content of SiO₂ and K₂O in Yanshanian magmatic rocks in Beihuaiyang area.

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