柴达木盆地北缘俄博梁地区多金属矿床地球化学特征及找矿预测  

Geochemical Characteristics and Prospecting Prediction of Polymetallic Deposits in the Eboliang Area,Northern Margin of Qaidam Basin

作　　者：王珩 侯文强 李元庆 东玥昕 WANG Heng;HOU Wenqiang;LI Yuanqing;DONG Yuexin(Qinghai Nonferrous Third Geological Exploration Institute,Xining,Qinghai 810013,China)

机构地区：[1]青海省有色第三地质勘查院,青海西宁810013

出　　处：《中国锰业》2025年第1期35-41,共7页China Manganese Industry

基　　金：青海省省级地质勘查专项资金项目(编号:青自然资[2022]12)。

摘　　要：柴达木盆地北缘俄博梁地区位于青藏高原北缘重要成矿带,区域地质条件复杂且地表覆盖严重,制约了矿产勘查效率。为破解勘查瓶颈并给该区资源勘查提供科学依据,通过地球化学分析,揭示该区多金属矿床的分布规律,基于1∶5万和1∶2.5万水系沉积物及土壤测量数据,结合因子分析、聚类分析和元素离散特征评估,剔除离群数据后,定量分析了24种元素的丰度、组合及空间分布特征。结果显示,区内圈定8处1∶5万综合异常和39处1∶2.5万异常,识别出4类关键元素富集区:As、Sb、Ag、Au富集区(构造蚀变岩型金矿),Zn、Co、Ni、Cr、Cu、Li(基性-超基性岩型铜镍矿),Th、La、Nb、Y、Sn、Mo、U(碱性花岗岩型铌钽矿)及W、Bi(高温热液型钨矿)。标准化方差表明,W(3.07)、Bi(2.05)、As(2.04)等元素局部富集显著,叠加变异强度达3.92~6.53。因子分析提取的4个主因子进一步验证了元素组合与成矿作用的关联性。最终划分出Au-Cu-稀有稀土和W-Au-Cu-Mo-Ba两类找矿靶区,其中西北部断层夹合部位发现7条金矿体,东部圈定5条铜镍矿化体。研究表明,俄博梁地区具备多类型矿床潜力,地球化学异常与构造-岩浆活动耦合性高,提出的靶区为后续勘查提供了精准方向。The Eboliang area located at the northern margin of Qaidam Basin and southern Altun tectonic belt belongs to the Au-Pb-Zn-Ti-Mn-Fe-Cr-Cu-W-rare metal metallogenic belt.Element geochemistry indicates that medium-low temperature hydrothermal element-rich areas such as As,Au,Sb,Ag in the study area have potential for structurally altered rock-type gold deposits.The mafic-ultramafic related element-rich area of Zn,Co,Ni,Cr,Cu,Li shows potential for copper-nickel sulfide deposits associated with buried intrusions.High-temperature hydrothermal element-rich areas(W,Mo)suggest possible tungsten deposits.Th,La,Nb,Y,Sn,Mo and U enrichment zones indicate niobium-tantalum deposit potential related to alkaline granites.Based on geochemical anomalies and metallogenic analysis,two prospecting targets(Au-Cu-REE and W-Au-Cu-Mo-Ba)were delineated,providing scientific basis for geological research and mineral exploration.

关 键 词：柴北缘 俄博梁地区 地球化学 找矿预测 多金属成矿带 

分 类 号：P618.2[天文地球—矿床学] P592[天文地球—地质学]