黄金科学技术 ›› 2022, Vol. 30 ›› Issue (5): 676-690.doi: 10.11872/j.issn.1005-2518.2022.05.188
万泰安1,2(),许德如1,2,3(),马文1,2,张胜伟1,2,王国建1,2,卞玉冰1,2,李博1,2
Tai’an WAN1,2(),Deru XU1,2,3(),Wen MA1,2,Shengwei ZHANG1,2,Guojian WANG1,2,Yubing BIAN1,2,Bo LI1,2
摘要:
万古金矿是江南造山带中金(多金属)成矿带的代表性矿床,目前对该矿床硫化物中的元素特征和金的富集机制研究相对较少。为了进一步探讨万古金矿中硫化物的微量元素特征,依据黄铁矿晶型及其他共生矿物特征,将其中的黄铁矿划分为3期(Py1、Py2和Py3),并对3期黄铁矿分别进行LA-ICP-MS分析。研究表明:Py1平行于地层层理,为不含金的原生黄铁矿;Py2与菱铁矿共生,是富CO2流体与围岩发生水岩反应所致,且对Py1具有继承性;Py3与烟灰色石英和毒砂共生,金含量较高。Py2表面孔隙发育,表明该期黄铁矿通过溶解—沉淀形成Py3。富金的Py3存在Au-As耦合现象,Au浓度明显低于金饱和曲线,推测Au以Au1+的形式赋于黄铁矿的晶格中。结合以往研究,推断硫化作用是万古金矿主要的金沉淀机制,富含Py2与菱铁矿的围岩是金沉淀理想的化学圈闭。
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