现代地质2026，Vol.40Issue(4)：1007-1022,16.DOI:10.19657/j.geoscience.1000-8527.202509010049
柴北缘青龙沟金矿床黄铁矿热电性与原位微量元素特征及其深部找矿意义
Pyrite Thermoelectricity and In-Situ Trace Elements:Implications for Deep Prospecting at the Qinglonggou Gold Deposit,Northern Margin of Qaidam Basin
摘要
Abstract
The Qinglonggou gold deposit is located in the Tanjian Mountain giant gold field along the northern margin of the Qaidam Basin.Orebodies are hosted in Mesoproterozoic Wandonggou Group phyllite and marble and are distinctly controlled by structures.Pyrite is the principal gold-bearing mineral,and its thermoelectric properties combined with in situ trace element compositions provide important constraints on ore-forming fluids and deposit genesis.Ore-stage pyrite samples from different depths of drill cores along exploration line 51 in the No.II ore belt were analyzed for thermoelectric characteristics and trace elements.Pyrite from different depths is predominantly of mixed P-N type,with thermoelectric coefficients mainly ranging from-250 μV/℃to 0.Formation temperatures cluster at 50 to 150℃and 350 to 525℃.Mineralizing fluids are enriched in As,Au,Cu,and Sb.Most pyrite samples show Co/Ni ratios of 0.1 to 1,whereas a minor proportion of ratios>1.Deep-level pyrite contains mantle-derived platinum-group elements(Pd,Pt).The phenomena described above indicate that the Qinglonggou Gold Deposit exhibits characteristics of both low-temperature and medium-to-high-temperature mineralization,with elemental features analogous to those reported in previous studies on Carlin-type gold deposits.Mineralization was influenced by both hydrothermal and sedimentary processes,with possible incorporation of mantle-derived materials into the ore-forming fluids.Overall,the Qinglonggou deposit is interpreted as a Carlin-orogenic composite-type gold deposit.Shallow mineralization is dominated by medium-to low-temperature hydrothermal processes influenced by sedimentary metamorphism,whereas deep mineralization reflects the combined effects of sedimentary metamorphism and high-temperature hydrothermal activity,recording multi-stage mineralization with mantle material input.Exploration should focus on structur-ally altered zones characterized by As-Au-Cu-Sb assemblages and P-N-type pyrite thermoelectric signatures.关键词
柴北缘/滩间山金矿田/青龙沟矿床/黄铁矿/热电性/LA-ICP-MS/找矿启示Key words
northern margin of Qaidam Basin/Tanjianshan Gold Field/Qinglonggou Deposit/pyrite/thermo-electricity/LA-ICP-MS/prospecting implications分类
天文与地球科学引用本文复制引用
谢一鸣,陈敏,李健,王根厚,赵文涛,谢海林,马金花..柴北缘青龙沟金矿床黄铁矿热电性与原位微量元素特征及其深部找矿意义[J].现代地质,2026,40(4):1007-1022,16.基金项目
青海省地质矿产勘查开发局2024年度局地质勘查项目(青地矿2024-79-19). （青地矿2024-79-19）
