首页|辽东地区王家崴子金矿古元古代金预富集矿化事件

辽东地区王家崴子金矿古元古代金预富集矿化事件

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王家崴子金矿床位于辽东半岛猫岭金矿集区内,为一中型石英脉型金矿床.矿体产于古元古代辽河群盖县组地层中,主要受控于区内一系列近平行的NW向韧性剪切带.本文选择与金密切共生的黄铁矿、闪锌矿和方铅矿为研究对象,采用LA-(MC)ICP-MS原位微区分析技术,开展原位S-Pb同位素和微量元素特征研究.S同位素测试结果显示王家崴子金矿床硫化物δ34S值为8.2％e～11.5‰,明显高于典型岩浆硫值范围,与盖县组地层硫范围重叠,推断可能主要来源于地层硫.王家崴子金矿床硫化物的208Pb/204Pb、207Pb/204Pb 和206 Pb/204Pb 值分别为 39.000～39.084、15.691～15.707 和 18.623～18.664,落在上地壳演化线附近且在盖县组地层范围内,表明上地壳地层围岩盖县组是王家崴子金矿床重要的Pb源.LA-ICP-MS微量元素分析显示黄铁矿具有低的Co/Ni和Te/Au比值,明显富集Au、As、Ag、Cu、Pb和Zn等元素,指示了其为沉积热液成因黄铁矿.综合前人有关盖县组地层及矿区岩浆岩研究结果,本文认为该地区可能存在着一期古元古代金预富集作用,而晚期的早侏罗世岩浆热液活动大量萃取了盖县组地层中早期预富集的成矿物质形成了王家崴子金矿.盖县组地层是辽东地区金成矿重要的矿源层,需在今后的找矿勘查工作中给予重视.
A Paleoproterozoic gold pre-enrichment mineralization event in the Wangjiawaizi gold deposit,Liaodong Peninsula
The Wangjiawaizi gold deposit is a middle tonnage and quartz-vein type deposit in the Maoling gold district of Liaodong Peninsula,China.The orebody is hosted in the Gaixian Formation of Paleoproterozoic Liaohe Group,and is mainly controlled by a series of nearly parallel NW ductile shear zones in the mine area.In this study,we studied pyrite that is genetically closely related to gold mineralization,as well as sphalerite and galena for S-Pb isotopes and trace elements characteristics by using in-situ microanalytic techniques.LA-MC-ICP-MS in-situ S isotope analyses show that sulfides from the Wangjiawaizi gold deposit yielded δ34S values of 8.2‰～11.5‰,which is significantly higher than that of magmatic sulfur,but overlaps with the range of δ34S value of the Gaixian Formation,thus inferring that the sulfur in the ore-forming fluids is derived from the Gaixian Formation.The in-situ Pb isotope analyses by LA-MC-ICP-MS show that sulfides yielded 208Pb/204Pb,207Pb/204Pb,and 206Pb/204Pb ratios of 39.000～39.084,15.691～15.707,and 18.623～18.664,respectively.They cluster near the upper crust evolution line and plot in the field of the Gaixian Formation,indicating that the Pb was primarily derived from the upper crustal rock of the Gaixian Formation.LA-ICP-MS trace element analyses show that pyrite yielded low Co/Ni and Te/Au ratios,and is obviously enriched in Au,As,Ag,Cu,Pb and Zn,indicating a metamorphic-hydrothermal origin.In combination with previous research,we propose that there is an early stage of Paleoproterozoic gold pre-enrichment in this Maoling gold district,and that the subsequent Early Jurassic magmatic-hydrothermal activity extracted the pre-enriched ore-forming materials from the Gaixian Formation to account for most of the gold mineralization in the Wangjiawaizi deposit.The Gaixian Formation is a significant source bed for gold mineralization in the Liaodong Peninsula,which should be given full attention in future mineral exploration work.

Wangjiawaizi gold depositLiaodong PeninsulaLA-(MC)ICP-MSS-Pb isotopesTrace elements

俞炳、王永彬、曾庆栋、陈伟军、杨进辉、周伶俐、孙国涛、陈沛文

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中国地质调查局发展研究中心,北京 100037

自然资源部矿产勘查技术指导中心,北京 100037

中国科学院地质与地球物理研究所,岩石圈演化国家重点实验室,北京 100029

云南大学云南省地球系统科学重点实验室,昆明 650500

中国科学院地质与地球物理研究所矿产资源研究重点实验室,北京 100029

中国科学院大学地球与行星科学学院,北京 100049

中国冶金地质总局矿产资源研究院,北京 101300

阿姆斯特丹自由大学地球科学系,阿姆斯特丹1081HV

贵州大学资源与环境工程学院,贵阳 550025

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王家崴子金矿床 辽东半岛 LA-(MC)ICP-MS S-Pb同位素 微量元素

国家自然科学基金国家重点研发计划国家重点研发计划中国地调局项目中国地调局项目国家留学基金

423020792021YFC29018052016YFC0600108-03-1DD2023035520230356201904910709

2024

10.18654/1000-0569/2024.04.12

岩石学报
中国矿物岩石地球化学学会,中国科学院地质地球物理研究所

岩石学报

CSTPCD北大核心
影响因子：2.74
ISSN：1000-0569
年,卷(期)：2024.40(4)
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