河北柴家沟钼矿床流体包裹体特征及成矿作用

Fluid inclusion characteristics and mineralization of Chaijiagou molybdenum deposit,Hebei Province

柴家沟钼矿床位于燕辽钼多金属成矿带西侧,矿体发育于燕山期花岗斑岩体及其与围岩的接触带中,该矿床蚀变作用明显,由内向外为钾化-绢英岩化-高岭土化,其中绢英岩化带与成矿关系最为紧密;矿化类型以网脉状和浸染状辉钼矿为主,流体包裹体特征显示,柴家沟钼矿主成矿阶段均一温度在141.5℃~398.4℃之间,流体盐度在4.2wt%~18.9wt%之间,流体密度在0.62~1.06g/cm3之间,计算得到的压力范围0.5MPa^18MPa,为中高温、中低盐度、中低密度流体,流体运移过程发生了沸腾作用,且很可能存在后期大气降水的混入。

Chaijiagou molybdenum deposit is located in the west of Yanliao molybdenum polymetallic metallogenic belt.The ore body is developed in the Yanshanian granite porphyry and its contact zone with surrounding rock.The alteration of the deposit is obvious.From the inside to the outside,it is potassic sericitization KAOLINIZATION,in which sericitization zone is the most closely related to mineralization;the mineralization types are mainly network vein and disseminated molybdenite,with fluid inclusion characteristics The results show that the homogenization temperature is 141.5℃~398.4℃,the fluid salinity is 4.2wt%~18.9wt%,and the fluid density is 0.62g/cm3~1.06g/cm3.The calculated pressure range is 0.5MPa^18Mpa.It is a medium high temperature,medium low salinity and medium density fluid.The fluid migration process has boiling effect,and it is likely that the later precipitation mixed in.