Transformation of minerals at the boundary of magma-coal contact zone:case study from Wolonghu Coal Mine, Huaibei Coalfield, China  

作　　者：Xing Chen Liugen Zheng Yalin Jiang Chunlu Jiang 

机构地区：[1]School of Resources and Environmental Engineering,Anhui University,Hefei,230601,Anhui,China [2]Anhui Province Engineering Laboratory for Mine Ecological Remediation,Hefei,230601,Anhui,China

出　　处：《International Journal of Coal Science & Technology》2021年第1期168-175,共8页国际煤炭科学技术学报（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(No.41373108 and 41702176);Natural Science Foundation of Anhui Province(No.1608085QD79);the Scientific and Technological Project of Huaibei Mining Industry(Group)Co.Ltd.(HK-2018-1);the Scientific and Technological Project of Anhui Traffic and Aviation Engineering(Group)Co.Ltd.We acknowledge the editors and reviewers for polishing the language and providing in-depth discussion.

摘　　要：Mesozoic and Cenozoic magma activity in the Wolong Lake mining area of Huaibei is frequent,and the degree of magma intrusion into coal seams remarkable.On the one hand,magma intrusion affects the utilization of coal resources;on the other hand,the macro and trace elements in coal are redistributed to form new mineral types.This study uses the Wolong Lake magma intrusion coal seam as a research object.The mineral paragenesis for igneous rock,coke,and thermally-altered coal in an igneous intrusion zone is studied using SEM,XRD,and Raman spectroscopy.During igneous intrusion,the temperature and pressure of igneous rock metamorphose ambient low-rank coal to high-rank coal and coke.The response mechanism of minerals and trace elements to magmatic intrusion is discussed.The results are:①SEM analysis shows that ankerite and pyrite are formed from magma intrusion.Both minerals are strongly developed in the magma-coal contact zone,and less well developed in thermally-altered coal.②XRD analysis shows that igneous intrusion strongly influences the types and content of minerals in coke and thermally-altered coal.In addition to the increase amounts of ankerite and pyrite,chlorite,serpentine,and muscovite,and other secondary minerals,are generated following igneous intrusion.③Raman analysis suggests that thermally-altered coal possesses the characteristics of both pyrite and coke.Coke from the magma-coal boundary zone possesses the typical characteristics of pyrite.Igneous rock contains a mineral similar to pyrite,confirmed by both having similar Raman peaks.The scattering intensity of Ag indicates that the formation pressure of pyrite increases from thermally-altered coal via the boundary between the coke zone and the igneous rock.

关 键 词：Thermally-altered coal Mineral Igneous intrusion Raman spectroscopy 

分 类 号：TD82[矿业工程—煤矿开采]