北淮阳地区不同变形-变质煤的元素分布及其影响因素

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。

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

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 Al~(3 ),K~ ,Si~(4 ),Ti~(4 ) concentrated in coal,but P~(5 ),Fe~(2 ) Fe~(3 ),Mn~(2 ),Na~ ,Ca~(2 ),Mg~(2 ) migrated outside. Otherwise,Al~(3 ),K~ ,Ti~(4 ),Na~ and Ca~(2 ) were abundant in weak stress zones,but Si~(4 ),P~(5 ),Fe~(2 ) Fe~(3 ) and Mg~(2 ) abundant in strong stress zones.The values of SiO_2/Al_2O_3 and K_2O/Na_2O 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 SiO_2 and K_2O in Yanshanian magmatic rocks in Beihuaiyang area.