摘要
芦子园铅锌矿床位于"三江成矿带"南段保山-镇康地块,矿体赋存于上寒武统沙河厂组第二、三段(∈3s2,∈3s3)中的一套碳酸盐岩系中,矿体呈似层状、透镜状、脉状,严格受构造控制,矿体及其周围发育大量的矽卡岩矿物。矿区大理岩和矿石的稀土元素配分模式为轻稀土元素相对富集,具有中等Eu亏损异常及无明显的Ce异常;矽卡岩的稀土元素配分模式可分为两类:一类为中等Eu亏损异常;另一类为无明显Eu异常或较弱的Eu正异常。大理岩、矽卡岩和矿石具有相似的REE配分模式,均为轻稀土元素相对富集型,具有一定的负Eu异常及无明显Ce异常,向右倾斜,通过各类岩(矿)石稀土元素特征分析,并结合矿床地质特征,认为成矿作用主要是在相对还原的环境下进行,其成矿物质来源于深部热液,可能部分来源于赋矿地层(∈3s2,∈3s3)。研究认为,该矿床为赋存于碳酸盐岩地层中明显受构造控制的热液充填交代矽卡岩型铅锌矿床。
Abstract： Luziyuan Pb-Zn deposit is located in Zhen- kang-Baoshan block, southern section of Sanjiang met- allogenic belt. The ore bodies occur in a set of carbon- ate rock series of the ~ 3s2, ~ 3s3. They are bedded, lenticular and vein, strictly controlled by structure. A large number of skarn minerals are occur in ore bodies and their surroundings. The REE distribution patterns of marbles and ores are enriched LREE and apparent medium negative Eu anomaly and unobvious Ce anom- aly. The REE distribution patterns of Skarn include weak negative Eu and unobvious Eu anomaly or in- clined positive anomaly. The marble, skarn and ores have similar REE distribution patterns which are en-riched LREE, and have apparent negative Eu and un- obvious Ce anomaly. Through the analysis of REE characteristics of rock （ore）, and in combination with deposit geological characteristics, suggests that the mineralization mainly occurs under the environment of relative reduction and its ore-forming materials are mainly sourced from the deep hydrotherm, and partly from the ore-hosting strata （ ∈3s2, ∈3s3）. The research shows that the deposit hosted in the carbonate formation is a hydrothermal filling and metasomatic skarn-type Pb-Zn deposit obviously controlled by tectonics.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2014年第1期117-128,共12页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(41363001)
云南省科技领军人才培养计划项目(20BHA001)
校人培基金项目(KKZ3201321023)
关键词
地球化学
稀土元素
成矿流体
芦子园铅锌矿
云南镇康
geochemistry
rare earth elements
ore-forming fluid
Luziyuan lead-zinc mine
Zhenkang Yunnan
