温泉钼矿床地质特征及成因浅析

The Geological Characteristics and Genesis Analysis of the Wenquan Molybdenum Deposit

本文通过对温泉钼矿床的岩石、结构构造、岩浆岩等地质特征及其化学分析、同位素测定、包裹体测温对该矿床的成因进行了初步的分析认为:该区是在岩浆作用期后,与岩浆有关的含矿热液在构造作用下,沿有利的断裂构造通道上升,随着物化条件的改变,在断裂带两侧围岩节理中尤其是断裂带上盘围岩节理中充填沉淀。由于岩石静压力和静水压力的更替,使围岩发生破裂或节理张合,含矿热液脉动沉淀,形成了相互交错的含矿石英网脉。断裂构造控制了矿体形态和展布,岩石节理控制了矿化的形态和特征。成矿作用是热液温度不是很高且是在相对较开放的系统中完成的。因此,温泉钼矿是赋存于中-细粒斑状黑云二长花岗岩岩体中,受岩体中断裂裂隙及节理控制的斑岩型中温热液钼矿床。

In this thesis, after the study of rocks, textures and structures, and the magmatite of the Wenquan molybdenum deposit, a preliminary genesis analysis of the deposit is made on the basis of the chemical analysis, isotope assaying, and inclusion thermometry. It is concluded that, after the magmatism in this area, the ore-bearing hydrothermal solutions related to magmas rose along the favourable faulted structure passageways; afterwards, it filled and deposited into the joints of the wall rocks especially of the up-hanging wall rocks in the fracture belts, with the change of physical and chemical conditions. Because of the change of static pressure and static water pressure, the wall rocks fractured or the joints opened and closed, causing the impulsive deposition of the ore-bearing hydrothermal solution, and the formation of the interlaced orebearing quartz net-veins. The fault structures controls the shape and strike distribution of the ore-bodies, and the rock joints control the shape and characteristics of mineralizations. The ore-formation occurred at the condition that the hydrothermal solution temperature was not very high and the system was open. Therefore, the Wenquan molybdenum deposit is a meso- thermal hydrothermal molybdenum ore deposit that is contained in the medium-fine grained porphyritic biotite monzonitic granite massif and controlled by faults and joints in the rock body.