浦城杉树坞萤石矿围岩蚀变岩相学特征及矿床成因  

Petrographic characteristics of wall rock alteration and genesis of ore deposit of Shanshuwu fluorite deposit in Pucheng

作　　者：赵东芳 孟都[2] Zhao Dongfang;Meng Du(College of Earth Sciences of Hebei GEO University,Shijiazhuang,Hebei,050031,China;Geological Institute of China Chemical Geology and Mine Bureau,Beijing,100101,China;Central Laboratory of China Chemical Geology and Mine Bureau,Zhuozhou,Hebei,072750,China)

机构地区：[1]河北地质大学地球科学学院,石家庄050031 [2]中化地质矿山总局地质研究院,北京100101 [3]中化地质矿山总局中心实验室,涿州072750

出　　处：《化工矿产地质》2024年第1期14-22,共9页Geology of Chemical Minerals

摘　　要：杉树坞萤石矿近矿围岩蚀变镜下微观表现为高岭土化、高岭土绢云母化、硅化等蚀变组合,野外露头蚀变调查确定围岩蚀变分带为原岩带-构造破碎带-高岭土化蚀变带-硅化绢云母化带-萤石矿带-硅化带-构造碎裂带-另一侧的原岩带,反应矿体成矿过程为原岩中细粒黑云母二长花岗岩和花岗斑岩,在经过一系列构造运动作用下,形成碎裂化黑云母二长花岗岩、碎裂化花岗斑岩;随着张性断裂活动进一步加剧,岩石破碎成角砾形成花岗质碎裂角砾岩;含矿热液沿构造裂隙运移,通过组分的带进带出,形成高岭土化碎裂角砾岩、高岭土绢云母化碎裂角砾岩、萤石硅化岩。杉树坞萤石矿受构造运动时产生的动力破碎叠加低温热液蚀变作用而成,属于低温热液充填型萤石矿床,硅化叠加强烈高岭土化、绢云母化为最为明显的找矿标志。The wall rock alteration of Shanshuwu fluorite ore shows the combination of kaolinitization,kaolinite sericitization and silicification under microscope.The wall rock alteration can be confirmed from the original rock belt-structural fracture belt,to kaolinitization belt-silicate sericite belt,to silicate belt,to tectonic fracture belt,to original rock zone on the other side by the investigation of the wall rock alteration of the field outcrops.It shows that in the process of ore body formation,medium-fine-grained biotite monzogranite and granitic porphyry in the original rock formed the fragmented biotite monzogranite and fragmented granite porphyry under a series of tectonic movements;With the further intensification of tensile fracture activity,the rock was broken into the granite fragmented breccia;The hydrothermal solution moves along the structural fissure,forming kaolinite fragmented breccia,kaolinite sericite fragmented breccia and fluorite silicified rock by bringing in and out the components.The fluorite ore is formed by the dynamic crushing generated by the tectonic movement and with superimposed low-temperature hydrothermal erosion,it belongs to the low temperature hydrothermal filling fluorite deposit,the silicified rock superimposed strong kaolinitization and sericite is the most obvious prospecting marker.

关 键 词：萤石矿 围岩蚀变 岩相学 矿床成因 

分 类 号：P571[天文地球—矿物学] P614[天文地球—地质学]