metamorphic rank
1.Thermal maturation of Permo-Carboniferous coal seams were mainly controlled by geothermal anomaly of Late Mesozoic, on the basis of this geothermal anomaly, different structural units has different metamorphic rank due to plutonic metamorphism and regional magmatic metamorphism.
2.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.
