摘要
那哥铜多金属矿床是江南古陆西南端黔东南地区多金属矿床的典型代表。该矿床产于新元古界地层中,受近东西向构造控制,与辉绿岩空间接触。利用ICP-MS,本文系统获得了该矿床矿石、赋矿围岩、外围花岗岩和隐伏花岗斑岩的REE组成,结果显示矿石具有变化的总稀土含量(∑REE=6.61×10-6～235×10-6)、轻稀土富集和负Eu异常(δEu=0.59～0.88)特征;赋矿围岩∑REE值范围较宽,介于74.2×10-6～286×10-6,并具有轻稀土富集和负Eu异常(δEu=0.79～0.88)特征;辉绿岩∑REE值介于78.1×10-6～90.9×10-6,较为稳定,为轻稀土富集和不明显的Eu异常特征(δEu介于0.98～1.01);花岗岩总稀土含量稳定(∑REE=132×10-6～193×10-6),具有轻稀土富集和明显的Eu负异常特征(δEu介于0.55～0.79);新发现隐伏花岗斑岩∑REE=74.9×10-6～120×10-6,具有轻稀土明显富集和显著的Eu负异常(δEu=0.44～0.56)。对比研究认为,那哥铜多金属矿床成矿流体中的REE主要继承围岩,表明部分成矿物质由赋矿地层岩石提供。
Nage Cu polymetallic deposit,a typical deposit in Congjiang County,southeast Guizhou province,China,is located in the southwest Jiannan Block.The ore deposit are hosted in Neoproterozoic strata and structurally controlled by EW-trending fault.The ore body is coexisting with diabase dyke in space.REE of ores,host rocks,granite and granite porphyry bulk-rocks were analyzed by ICP-MS.Results show that the ∑REE of ores bulk-rocks range from 6.61×10-6 to 235×10-6,with LREE-enriched and negative Eu anomaly（0.59-0.88）;∑REE of host bulk-rocks range from 74.2×10-6 to 286×10-6,characterized by LREE-enriched and negative Eu anomaly（0.79-0.88）;Diabase samples have ∑REE ranging from 78.1×10-6 to 90.9×10-6,with slightly LREE-enriched and unconspicuous Eu anomaly（0.98-1.01）;Granite samples have stable ∑REE contents,ranging from 132×10-6 to 193×10-6,enrich in LREE with Eu-depleted（0.55-0.79）;Granite porphyry bulk-rocks samples have relatively lower ∑REE contents（74.9×10-6-120×10-6） than granite,characterized by obviously LREE-enriched and prominent negative Eu anomaly（0.44-0.56）.Based on comparative study on contents,parameters and patterns of REE for whole rock of ores,host rocks and igneous rocks,we consider that the REE in the ore-forming fluids were originated from host rocks.
出处
《矿物学报》
CAS
CSCD
北大核心
2013年第2期239-244,共6页
Acta Mineralogica Sinica
基金
贵州省科学技术基金项目(黔科合J字[2012]2334号)
中国科学院地球化学矿床地球化学国家重点实验室开放基金项目(2011001
2009014)
