贵州锦丰（烂泥沟）金矿床含砷黄铁矿和脉石英及其包裹体的微量元素特征

贵州锦丰（烂泥沟）金矿是滇黔桂“金三角”目前已探明最大的卡林型金矿床。含砷黄铁矿是该矿床最主要的载金矿物，硅化及石英脉是最显著的热液蚀变类型。本文采用高精度电感耦合等离子质谱（ICP-MS）对含砷黄铁矿和脉石英及其包裹体的微量元素进行了测试，结果表明含砷黄铁矿富亲硫元素，并相对于围岩和上部地壳均强烈富集；亏损V，Sr 及高场强元素。同生黄铁矿也具有类似的特征。脉石英除亲石元素含量高以外，还表现为亲硫元素以及Mo，Bi 含量较高。但与上部地壳相比，绝大部分元素贫化。相应包裹体的微量元素含量普遍低于单矿物，但变化特征一致。结合矿物和包裹体的稀土元素分析，发现脉石英和含砷黄铁矿及其包裹体均表现为HFSE明显亏损，Th/La，Nb/La 比值小于1，说明成矿流体为富Cl 的流体。含砷黄铁矿及其包裹体中Co/Ni 比值远小于1，反映成矿温度较低，推测成矿流体主要来源于以沉积建造水为主的盆地流体。

Trace Elements Features of the Vein Quartzs,Arsenian Pyrites and Their Fluid Inclusions in Jinfeng(Lannigou) Gold Deposit,Guizhou Province,China

Jinfeng(previously known as Lannigou) is the largest known Carlin-type gold deposit in the Yunnan-Guizhou-Guangxi triangle area of southwestern China.Arsenian pyrite is the most important Au-bearing mineral,and silicification with quartz veins is the well-marked hydrothermal alteration.The trace elements of arsenian pyrites,vein quartzs and fluid inclusions in these minerals were analyzed by ICP-MS in this paper.The results show that in contrast to wall rocks and upper crust,the arsenian pyrites are enriche...