The Petrology And Mineralogy Of Structural Alteration Mineral Zone Division And Map In Nannihu Ore Deposit

Nannihu molybdenum Orefield is the largest molybdenum mine in China,It mainlyconsists of three porphyry-skarn type molybdenum deposits. With extensive systemicgeological investigation and scientific research, significant progresses has been made. Howere,the study on petrology of the deposit and works on alteration lithological zone are stillincomplete. Thus, this thesis focusing on “The petrology and mineralogy of structuralalteration mineral zone division and map in Nannihu ore deposit” has a great scientific andmineral prospecting significance.This thesis is based on He’nan Provence mineral exploration project of “OrefieldTectonic Facies and Metallogenic Series of Studies in Precious Metals, Non-ferrous MetalDeposit Gathering HeNan Area, Southern Margin of The North China Ancient Land”Combined with previous work, field geological informations we had obtaind after four monthfield geological work and rock flakes obversation in the laboratory, we have finishedthe1:10,000structural alteration mineral mapping of Nannihu ore field. The thesis hadAchieved several results as below:(1)Based on the work of measured sections and the petrology, we defined the Thermalcontact metamorphism hornfels of Nannihu oredeposit area.(2)The structural alteration zone could be devided into6scetions in NWW trending ofthe ore deposit: biotite felsic hornfels, quartzite, chloritizatized flow cleavaged biotite felsichornfels, flow cleavaged biotite felsic hornfels, interlayered biotite felsic hornfels and Shearrheology fold hornfels。(3)Established the field structural alteration zone division signs and microscopic signs inNannihu ore deposit.(4)Completed1:10,000Ore field structural Alteration Mineral Mapping of Nannihu andsummarize the spatial distribution of the altered Mineral.(5)We analyse and summerize the characteristics of ore-control factors such as thepetrology of intrusion, wall rock and tectonics and discussed ore-forming laws in Nannihu oredeposit.In summary, the structural Alteration Mineral Mapping as a significant indictor forgeological maping has an important practical application in deep mineral exploration in thePeriphery of metallogenic area.