广西下巴铅锌矿床稀土元素地球化学特征研究

利用电感耦合等离子体质谱(ICP-MS)分析了广西下巴铅锌矿床中不同矿脉矿石以及围岩中的稀土元素地球化学特征,并对成矿流体的来源进行了探讨。结果表明:下巴铅锌矿床的稀土总量较低,为0.51×10-6～36.53×10-6,LREE/HREE比值相对稳定,介于3.06～6.05之间;在不同类型矿体中,稀土含量和配分模式变化较大,样品测试结果中出现Ce的负异常和Eu的正负两种异常。根据上述结果和矿床特征研究,推断矿床成因为含矿热卤水与深部循环地下热水汇合形成,在特定的物理化学条件下沉淀下来并富集成矿。

广西下巴铅锌矿床镉元素的富集规律研究

利用电子探针和等离子质谱(ICP-MS)分析手段,对下巴铅锌矿床中镉元素的分布特征进行分析研究,并探讨镉元素在矿床中的赋存方式。结果表明,该矿床铅锌矿化系列中的镉含量超过了其作为伴生有用组分的最低工业品位,矿床中镉元素主要赋存于闪锌矿中,与闪锌矿含量成正比关系。矿区范围内镉元素由南至北呈现出高—高—低的分布规律,在东西方向上,呈现出低—高—低的分布规律。研究结果认为海底热液与热卤水共同参与了下巴铅锌矿成矿作用,矿床成因类型可归为海底热液和热卤水混合型。

广西下巴铅锌矿床镉元素的富集规律研究

本文利用电子探针和等离子质谱(ICP-MS)分析手段,对下巴铅锌矿床中镉元素的分布特征进行了分析研究,并探讨了镉元素在矿床中赋存方式。结果表明,该矿床铅锌矿化系列中镉含量超过其作为伴生有用组分的最低工业品位,矿床中镉元素主要赋存于闪锌矿之中,与闪锌矿含量成正比关系。矿区范围内镉元素由南至北呈现出高-高-低的规律,在东西方向上,呈现出低-高-低规律。

Characteristics of the ore forming fluid from the zinc poly-metallic deposit in the Mopan mine area,Guangxi Nandan

Fluid inclusions from samples from the layered and veined mineralized belt in the Mopan mine area were studied using microscopic temperature measurements and laser Raman spectroscopy.Further studies were conducted on the nature and source of the ore forming fluid and on the mechanism of deposit formation.The results show that there are three types of inclusions that occur in both the layered and veined ore body.These are liquid inclusions,CO 2 inclusions with a liquid phase,and NaCl-H 2 O multiphase inclusions.The fluid inclusions in both the layered and veined ore bodies have similar characteristics.The ore forming fluid is strongly reducing,was exposed to low to medium temperatures,salinity,and pressures.The source of this ore forming fluid was a mix of submarine volcanic spring(blow-piping),magmatic hydrothermal jet,and underground water.