摘要
四川布托县乌依铅矿床是川滇黔相邻区赋存于奥陶系大箐组地层中的典型密西西比河谷型矿床之一,其成矿物质来源仍不清楚。本文开展了方铅矿和石膏硫同位素及方铅矿稀土元素地球化学研究,获得方铅矿硫同位素δ^(34)S平均值为-4.04‰(n=31),石膏δ^(34)S平均值为29‰(n=15)。方铅矿稀土元素地球化学表明,轻稀土富集,重稀土明显亏损,稀土配分模式曲线大致向右倾,Eu正异常和Ce负异常。结合前人的硫、铅同位素数据,认为乌依铅矿床硫来源于细菌还原地层中硫酸盐所产生的硫,矿石铅来自上地壳,成矿物质来源为奥陶系大箐组,与峨眉山玄武岩无关。
The Wuyi lead deposit is one of the typical Mississippi Valley type deposits occurred in the Ordovician Daqing Formation in the Sichuan-Yunnan-Guizhou neighboring region. To address the question about ore-forming material sources for this deposit,this work conducted a geochemical study on galena and gypsum sulfur isotopes and rare earth elements of galena. The results show that the average of galena sulfur isotope（ δ34 S） is-4. 04‰（ n = 31） and gypsum sulfur isotope（ δ34 S） is 29‰（ n = 15）. The rare earth elements of galena exhibit an enrichment of heavy rare earth elements and a deficit of light REE,and distribution pattern curves of REE are approximately of right deviation with positive Eu anomalies and negative Ce anomalies. In combination with previous sulfur and lead isotope data from this deposit,this study suggests that the sulfur of the Wuyi lead deposit was derived from reduction sulfate of stratum,and the ore-forming material source of the lead is not the Emeishan basalt,but the Ordovician Daqing Formation.
出处
《地质与勘探》
CAS
CSCD
北大核心
2017年第6期1051-1060,共10页
Geology and Exploration
基金
中国地质调查局地质调查项目(编号:1212010000150002)
国家自然科学基金项目(编号:41603034)资助
关键词
硫同位素
铅同位素
稀土元素
铅矿床
乌依
布拖县
四川省
sulfur isotope, lead isotope, REE lead deposit, Wuyi, Butuo County, Sichuan Province
