摘要
柏林城锌多金属矿床位于太行山中生代构造—岩浆—成矿带北段,大河南岩体的东部。通过对矿石中的黄铁矿和闪锌矿进行主微量元素和S同位素分析,探讨了矿床的成矿环境、矿床成因类型和成矿物质来源。柏林城锌多金属矿床的矿体呈似板状和透镜状顺构造带产出,围岩为灰岩。研究结果显示:(1)黄铁矿表现为富铁亏硫,δFe/δS-As和As-Co-Ni图解显示该矿床为岩浆热液成因;(2)黄铁矿Fe/(S+As)比值为0.857~0.902,表明其形成于浅部环境;(3)黄铁矿Co/Ni比值与闪锌矿Zn/Fe、Zn/Cd比值均指示该矿床为中温热液型矿床,闪锌矿ln(Ga)/ln(In)比值进一步指示其为矽卡岩型矿床;(4)黄铁矿δ^(34)S值为5.47‰~8.88‰,表明成矿物质硫来源主要为岩浆热液,并有少量地层硫加入;(5)黄铁矿是重要的载金矿物,其As与Au元素呈正相关关系,显示黄铁矿中金为离子形式的晶格金。综上所述,太行山北段柏林城锌多金属矿床具有矽卡岩型矿床的成矿特征,为浅部形成的中温岩浆热液型矿床。
The Bailincheng Zn-polymetallic deposit is situated within the northern section of the Mesozoic tectono-magmatic-metallogenic belt of the Taihang Mountains,specifically in the eastern region of the Dahenan granitoid pluton.This study employs electron probe microanalysis(EPMA)to determine the major elements compositions of Pyrite and sphalerite,laser ablation inductively coupled plasma mass spectrometry(LA-ICPMS)for trace elements,and in-situ sulfur isotope analysis to elucidate the ore-forming environment,genetic type of the deposit,and the source of ore-forming materials.The orebodies of the Bailincheng Zn-polymetallic deposit occur in subtabular to lenticular forms,aligned with the structural belt,and are hosted within limestone.The findings reveal that Pyrite is characterized by an average sulfur content of 53.51%and iron content of 46.96%,indicating a slight enrichment in Fe and depletion in S compared to theoretical values(S=53.45%,Fe=46.55%),which suggests a Fe-rich,S-deficient nature.Additionally,δFe/δS-As and As-Co-Ni discrimination diagrams suggest a magmatic–hydrothermal origin.The Fe/(S+As)ratio in Pyrite exhibits a strong correlation with the mineralization position(r=0.878).In the Bailincheng deposit,Pyrite displays Fe/(S+As)values ranging from 0.857 to 0.902,with an average value of 0.877,suggesting formation in a shallow environment.The Co/Ni ratios in Pyrite range from 2.9 to 277.2,with Py-1(associated with early-formed oxide minerals)averaging 30.7 and Py-2(associated with late-stage sphalerite)averaging 131.5.Both Py-1 and Py-2 exhibit Co/Ni ratios greater than 1,indicative of hydrothermal Pyrite.Sphalerite displays Zn/Fe ratios ranging from 76.69 to 84.97(average 80.46)and Zn/Cd ratios from 320 to 419(average 377.16),which are characteristic of a medium-temperature hydrothermal deposit.Furthermore,the ln(Ga)/ln(In)ratios in sphalerite suggest affinities with skarn-type deposits.The δ^(34)S values of Pyrite range from 5.47‰to 8.88‰,with an average of 6.7‰.Compared to surrounding deposits,Pyrite from Bailincheng exhibits more positive δ^(34)S values,indicating that the sulfur in the ore-forming fluids was primarily derived from magmatic-hydrothermal sources,with minor contributions from strata-derived sulfur.Pyrite is identified as the principal gold-bearing phase,with arsenic and gold showing a positive correlation,suggesting that gold primarily occurs as lattice-bound ionic gold within the Pyrite.In summary,the Bailincheng Zn-polymetallic deposit in the northern Taihang Mountains is characterized by skarntype mineralization,and represents a medium-temperature magmatic-hydrothermal deposit formed in a shallow environment.
作者
郭子桤
张聚全
温雨菁
张龙
张乐民
吴晓贺
GUO Ziqi;ZHANG Juquan;WEN Yujing;ZHANG Long;ZHANG Lemin;WUXiaohe(Hebei Key Laboratory of Strategic Critical Mineral Resources,Hebei GEO University,Shijiazhuang 050031,Hebei,China;Hebei Province Collaborative Innovation Center of Strategic Critical Mineral research,Shijiazhuang 050031,Hebei,China;College of Earth Science,Hebei GEO University,Shijiazhuang 050031,Hebei,China)
出处
《黄金科学技术》
北大核心
2026年第1期128-149,共22页
Gold Science and Technology
基金
国家自然科学基金项目“克拉通内部岩浆—热液成矿系统发育机制研究:以华北克拉通为例”(编号:U2444208)资助。
关键词
黄铁矿
闪锌矿
微量元素
硫同位素
矽卡岩型矿床
成矿指示意义
成因矿物学
pyrite
sphalerite
trace element
S isotopes
skarn-type deposits
metallogenic indicative significance
genetic mineralogy
