吉林大黑山斑岩型钼矿床成矿阶段及含矿裂隙分布规律

Mineralization Stages and Joint Distribution Regularity of Daheishan Porphyry Molybdenum Deposit in Jilin Province

吉林省大黑山钼矿赋矿岩体主要为花岗闪长岩及角砾岩,与成矿相关斑岩为花岗闪长斑岩,斑岩含矿性较差。矿床发生多阶段钼矿化叠加活动:Ⅰ-细石英网脉阶段、Ⅱ-较宽石英网脉阶段、Ⅲ-宽石英网脉阶段、Ⅳ-石英大脉阶段,其中Ⅱ、Ⅲ阶段为主成矿阶段。矿区内不同阶段含矿节理统计玫瑰花图及等密度图结果显示:前三阶段含矿裂隙的形成与斑岩体的侵入密切相关,第Ⅳ阶段的石英大脉走向主要为北西向,可能受区域北西向构造活动的影响;含矿裂隙研究表明大黑山钼矿为典型的斑岩型矿床。

The Daheishan molybdenum ore body resides in granodiorite and breccia pipe,and the rock related to mineralization is granodiorite porphyry which is poor in mineralization The hydrothermal mineralization period can be divided into four stages：I. narrow quartz stockwprk stage,II. relatively broad quartz stockwork stage,III. broad quartz stockwork stage,and IV. big quartz vein stage,among which stages II and III are the main mineralization stages. Joint iso-intensity and strike rose diagrams of the Daheishan deposit show that the mineralization stages I^III have a close relationship with the intrusion of porphyry. The faults formed in mineralization stage VI primarily strike in northwest,and probably are the results of regional tectonic activities. The study of ore-bearing fissures presented in this paper demonstrates that the Daheishan molybdenum deposit is a typical porphyry deposit.