安徽省池州市马头矿床马头矿段钼矿地质特征及成因类型分析

Analysis on geological characteristics and genesis of Matou molybdenum in Matou deposit,Chizhou,Anhui Province

安徽马头矿床马头矿段钼矿是采用了物探、化探、地质基础工作与钻探等综合手段进行勘查发现的矿床,在总结该矿床的成矿地质背景、矿床地质特征的基础上,对矿床的成因类型进行分析。研究认为:钼矿床主要赋存于花岗闪长(斑)岩与志留系的接触带中,另赋存于钾长花岗(脉)岩内及其附近,本矿床应属斑岩型矿床。控矿因素主要有构造(断层、节理、裂隙)及接触带,受侵位作用形成的破裂带控制,岩体接触带附近岩体与围岩中节理、裂隙是主要的容矿构造。成矿作用与钾长石化、石英-绢云母化蚀变有密切关系。矿石类型主要为石英脉型辉钼矿石、细脉状辉钼矿石,本矿床含矿母岩应主要为花岗闪长(斑)岩,成矿流体主要来自岩浆晚期-期后热液,矿床成因类型为斑岩型铜钼矿床。

The molybdenum deposit in the Matou ore section of the Matou deposit in Anhui Province is a deposit discovered by comprehensive means of geophysical exploration,geochemical exploration,geological basic work and drilling.Based on the summary of the metallogenic geological background and geological characteristics of the deposit,the genetic types of the deposit was analyzed.It is concluded that the molybdenum orebodies mainly occurs in the contact zone between granodiorite(porphyry)rocks and Silurian strata,and also occurs in and near potassium feldspar granite(vein)rocks.The deposit belongs to porphyry type deposit.The main ore-controlling factors are structures(faults,joints,fissures)and contact zones,which are controlled by fracture zones formed by emplacement.Joints and fissures in rock mass and surrounding rock near the contact zone are the main ore-hosting structures.The mineralization is closely related to potassium feldspar and quartz-sericite alteration.The ore types are mainly quartz vein type molybdenum ore and veinlet type molybdenum ore.The ore-bearing parent rock of this deposit should be mainly granodiorite(porphyry).The ore-forming fluid mainly comes from late-post magmatic hydrothermal solution.The genetic type of the deposit is porphyry type copper-molybdenum deposit.