Pattern and mechanism of metamorphism of late permian coal in western Guizhou
Abstract：Based on the test of coal vitrinite reflectivity,combined with abundant data of exploration,the pattern and mechanism of metamorphism of late permian coal seam in western Guizhou was summarized.Through the compositive analysis of the tectonic evolution background,the observation of field geology,the microstructures and the test of fluid inclusion,the metamorphism mechanism of coal in western Guizhou was deeply discussed.The research results indicate that the coal rank is complete in western Guizhou coalfield,the metamorphic grade is generally higher and characterized by north-south higher,middle lower and west higher,east lower,and increasing outward around the two lower grade areas,Panguan syncline and Shuicheng;the plutonic metamorphism is the main type to the late permian coal seam,and the rank raises by the regional magmatic thermal metamorphism in J3-K1,the structure formed in Yanshan movement decides the buried depth and further controlled the metamorphic grade of coal,and metamorphism pattern is established in western Guizhou.The discordogenic faults such as Shuicheng-Ziyun fault are ductile deformation of the upper crust and in compressional stress field,so they are not the channel of magma except sporadic areas.
Keywords：western Guizhoulate permian coalmetamorphism patternmetamorphism mechanismvitrinite reflectivityfluid inclusion
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 424-429 )