上黑龙江盆地虎拉林金矿床硫、铅同位素特征及其成因探讨
投稿时间:2019-05-31  修订日期:2019-07-07  点此下载全文
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巩 鑫 中国地质大学(北京)地球科学与资源学院 xingong2502@163.com 
赵元艺 中国地质科学院矿产资源研究所  
水新芳 中国地质科学院矿产资源研究所  
刘 璇 中国地质大学(北京)地球科学与资源学院  
程贤达 中国地质大学(北京)地球科学与资源学院  
王远超 中国地质大学(北京)地球科学与资源学院  
谭伟 中国地质大学(北京)地球科学与资源学院  
中文摘要:虎拉林矿床位于中亚造山带东段额尔古纳地块之上,处于上黑龙江盆地西侧,东与砂宝斯、老沟等金矿床相邻。矿床载金矿物主要为薄膜状、粒状及脉状黄铁矿,成矿与早白垩世花岗斑岩、石英斑岩及隐爆角砾岩有密切联系。在对矿床详尽的野外工作基础之上,通过对金属硫化物硫、铅同位素分析研究,探讨成矿物质来源,揭示矿床成矿规律。研究结果表明,上黑龙江盆地虎拉林矿床矿石及围岩中黄铁矿δ34SV-CDT分布于0.7‰ ~ 2.2‰,平均为1.18‰,集中于1.0‰左右,呈塔式分布,显示主要为岩浆硫特征;铅同位素206Pb/204Pb、207Pb/204Pb、208Pb/204Pb值分别为18.468 ~ 18.511、15.578 ~ 15.625、38.215 ~ 38.370,分布范围较小,且具有造山带铅特征。铅同位素μ值为9.41 ~ 9.50,均小于9.58;ω值为35.04 ~ 35.93,均值35.49,小于正常铅ω值;Th/U为3.60 ~ 3.66,显示出具有壳幔混源特征;在铅同位素构造环境判别图中,显示出具有下地壳部分熔融的特征;Δγ-Δβ图解显示矿床铅来源于上地壳与地幔混合带俯冲岩浆作用成因的铅同位素源区。综合矿床类型、矿体产出特征、矿体及围岩硫、铅同位素特征认为,虎拉林金矿区成矿物质主要来源于下地壳物质熔融形成的深部岩浆,同时存在上地幔与上地壳部分熔融物质的参与,成矿过程与早白垩世岩浆活动关系密切,形成于蒙古-鄂霍茨克洋闭合后伸展环境背景下。
中文关键词:地球化学  硫同位素  铅同位素  虎拉林  上黑龙江盆地
 
Study on sulfur and lead isotope characteristics and genesis of Huilalin gold deposit in Upper Heilongjiang Basin
Abstract:The Hulalin deposit is located on the Erguna block in the east part of the central Asian orogenic belt, on the west side of the Upper Heilongjiang Basin and adjacent to the gold deposits of Shaobaosi and Laogou in the east. The gold deposits are mainly thin-film, granular and veined pyrite. Mineralization is closely related to Early Cretaceous granitic porphyry, quartz porphyry and cryptoexplosive breccia. Based on the detailed field work of the deposit, the source of metallogenic materials and the ore-forming rules are revealed are discussed through the analysis and study of sulfur and lead isotopes of metallic sulfide. The results show that, the δ34SV-CDT values of Pyrite from 0.7‰ to 2.2‰ of the Huilalin ore deposit and surrounding rock in the Upper Heilongjiang Basin, with an average of 1.18‰ and concentrated around 1.0‰, in a tower distribution, showing that it is mainly magma sulfur. The 206Pb/204Pb,207Pb/204Pb,208Pb/204Pb values of lead isotopes respectively from 18.468 to 18.511,15.578 to 15.625, 38.215 to 38.370. The distribution range is small and has orogenic belt lead characteristics. The μ values of lead isotope from 9.41 to 9.50, all less than 9.58, the ω values were 35.04 to 35.93, with an average value of 35.49, less than that of normal lead ohm values, Th/U is 3.60 ~ 3.66. The above features show the mixed source characteristics of crust and mantle. The map of lead isotopic tectonic environment shows the characteristics of partial melting of lower crust. Δγ-Δβ diagram shows deposit lead from the mantle and crust mixed with subduction magmatism causes lead isotope source area. Comprehensive deposit type, orebody characteristics, ore body and wall rock output that sulfur, lead isotope characteristics, metallogenic material mainly comes from Hulalin gold mining area under deep crustal material formed by molten lava, at the same time the upper mantle and the participation of partial melting of crust material, ore-forming process and closely related to the early Cretaceous magmatic activity, formed in Mongolia-Okhotsk closed the stretch the background.
keywords:geochemistry  sulfur isotope  lead isotope  Hulalin  Upper Heilongjiang Basin
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