摘要
新疆柯坪前陆盆地西克尔—三岔口一带发现了以喀拉勒克为代表的一系列萤石矿床,为了明确该萤石矿带典型矿床的地质特征、地球化学特征、各萤石矿的相互关系,总结矿床成因,通过地质调查、地球化学测试分析、矿床对比分析对喀拉勒克等萤石矿床进行了研究。目前喀拉勒克已圈出萤石矿体3条,矿体走向延伸114~223 m,倾向延伸107~170 m,平均厚度为1.84~3.12 m,矿体CaF_(2)的平均品位为33.71%~34.85%。地球化学特征上,西克尔—山岔口一带萤石矿稀土配分曲线表现为平缓的右倾特征,δEu以正异常为主,δCe整体为负异常,且3个矿床特征相似。在La/Ho-Y/Ho及Tb/La-Sm/Nd图解中不同矿床具有线性特征,表明其具有相近的物源,且成矿环境相似。研究认为,在晚二叠—早三叠世区域大规模岩浆活动背景下,盆地含有机质卤水与深部岩浆热液混合,形成含F流体沿地层中的裂隙、不整合面运移,与灰岩地层发生交代而形成的充填-交代型矿床。
A series of fluorite deposits represented by Karalik deposit have been discovered in the Xike'er-Sanchakou area of Keping Foreland Basin in Xinjiang.In order to clarify the geological and geochemical characteristics of the typical deposits in the fluorite belt,the correlation of the fluorite deposits,and the deposit genesis,this paper studies Kalalek fluorite deposit through geological survey,geochemical test,and deposit comparison analysis.Three fluorite ore bodies have been circled out in the Kalalek mining area.The ore body extends 114-223 m in striking direction and 107-170 m in dipping direction with an average thickness of 1.84-3.12 m.The ore body average grade of CaF_(2) is 33.71%-34.85%.In terms of geochemical characteristics,REE distribution curve of fluorite deposits in the Xike'er-Shanchakou area shows a gentle right-dipping feature,δEu is mainly positive anomaly andδCe is negative anomaly as a whole,and the REE characteristics of the three deposits are similar.Different deposits have linear characteristics in La/Ho-Y/Ho and Tb/La-Sm/Nd diagram,indicating that they have similar metallogenic materials source and similar mineralization environment.The study suggests that under the regional background of large-scale magmatic activity in the Late Permian-Early Triassic epoch,organic brine is mixing with deep magmatic hydrothermal fluids in the basin,and F-bearing fluids migrate along the fractures and unconformities in the strata.A filling-metamorphic deposit forms by the replacement of the F-bearing fluids with limestone strata.
作者
张磊
叶雷
余子昌
帅磊
管诰
ZHANG Lei;YE Lei;YU Zichang;SHUAI Lei;GUAN Gao(China Non-ferrous Metals Resource Geological Survey,Beijing 100012 China)
出处
《矿产与地质》
2021年第5期875-883,共9页
Mineral Resources and Geology
基金
中国地质调查局项目“西南天山成矿带霍什布拉克—乌拉根地质矿产调查”项目(编号:DD20160001)资助。
关键词
喀拉勒克萤石矿
矿床地质特征
矿床成因
充填-交代型
新疆塔里木盆地西缘
Kalalek fluorite deposit
geological characteristics of deposit
deposit genesis
filling-replacement type
west margin of Tarim Basin
