摘要
烂泥沟金矿位于南盘江坳陷,是我国一个超大型的卡林型金矿,地球物理和沉积相研究表明,该矿区整体位于斜坡相地层。本次研究以南盘江坳陷烂泥沟金矿中斜坡相地层中三叠统许满组、边阳组为研究对象,采用ICP-MS、ICP-AES等元素地球化学测试方法分析测试结果,明确其地球化学特征及沉积环境性质。研究结果表明:(1)许满组、边阳组暗色泥岩、粉砂质泥岩Cs元素强烈富集,Li,Cu,Sn,Pb,V,U等六元素相对富集,Ba元素亏损,泥岩总体富轻稀土;(2)该区中三叠世古水体较深,整体多为富氧—半咸水介质,仅许满组三段沉积期为咸水介质;(3)该区许满组三段沉积期为干旱气候,许满组四段沉积期为半潮湿-半干旱沉积环境;(4)该区中三叠世由大陆岛弧提供沉积物源。
The research of geophysics and sedimentary facies shows that the Lannigou super-large Carlin type gold deposit in Nanpanjiang depression was developed in slope facies formation.ICP-MS and ICP-AES are used to study the geochemical characteristics and depositional environment of the Middle Triassic Xuman Formation and Bianyang Formation in the Lannigou gold deposit,Nanpanjiang Depression.The results show that the dark mudstone and silty mudstone of Xuman and Bianyang Formations are enriched in Cs,Li,Cu,Sn,Pb,V,U,but poor in Ba,and the mudstone is enriched in LREE.In the middle Triassic period,the paleo-water in this area was deep and with dominant oxygen-rich brackish water medium,except the third member of Xuman Formation was deposited in the saltwater medium.The sedimentary period of the third member of Xuman Formation is an arid climate,while that of the fourth member of Xuman Formation is a semi-humid and semi-arid environment.The middle Triassic sediments in this area were provided by the continental island arc.
作者
范惠珺
胡煜昭
程涌
李丕优
崔苗
许赛华
Fan Huijun;Hu Yuzhao;Cheng Yong;Li Piyou;Cui Miao;Xu Saihua(Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Yunnan Mineral Resources Laboratory,Kunming 650093,Yunnan,China;Faculty of Metallurgy and Mining Engineering,Kunming Metallurgy College,Yunnan Kunming 650033,China)
出处
《矿物岩石》
CAS
CSCD
北大核心
2022年第2期60-70,共11页
Mineralogy and Petrology
基金
国家自然科学基金项目(批准号:41672073)。
关键词
烂泥沟金矿
边阳组
许满组
沉积地球化学特征
古环境
Lannigou gold deposit
Bianyang Formation
Xvman Formation
sedimentary geochemical characteristics
paleo-environment
