黑龙江高松山金矿赋矿围岩年代学及岩石地球化学特征  

Geochronology and Petrogeochemistry Characteristics of Ore-bearing Rocks in the Gaosongshan Gold Deposit,Heilongjiang Province

作　　者：张春鹏[1] 韩仁萍[1] 毕中伟[1] 王杰[1] 李雪峰 ZHANG Chunpeng;HAN Renping;BI Zhongwei;WANG Jie;LI Xuefeng(Shenyang Center of China Geological Survey(Northest Geology Science and Technology Innovation Center),Shenyang 110034,Liaoning,China;Natural Resources Survey Institute of Heilongjiang Province,Harbin 150036,Heilongjiang,China)

机构地区：[1]中国地质调查局沈阳地质调查中心(东北地质科技创新中心),辽宁沈阳110034 [2]黑龙江自然资源调查院,黑龙江哈尔滨150036

出　　处：《黄金科学技术》2025年第1期66-83,共18页Gold Science and Technology

基　　金：中国地质调查局项目“黑龙江东安—汤旺河金矿大型资源基地综合地质调查”(编号:DD20242075)和“黑龙江小兴安岭—张广才岭成矿规律及找矿预测”(编号:121201185236)联合资助。

摘　　要：高松山金矿床是我国东北小兴安岭北麓地区的一处大型浅成低温热液型矿床,金矿体主要以细脉状和脉状形式分布于下白垩统板子房组和宁远村组的火山岩地层中。为探究赋矿围岩的成因及形成时代,开展了系统的同位素年代学和元素地球化学研究工作。研究结果显示:板子房组英安岩获得^(206)Pb/^(238)U表面年龄分布于112.1~115.9 Ma,板子房组安山岩中斜长石^(40)Ar-^(39)Ar同位素年龄为(111.2±0.9)Ma,宁远村组流纹岩中钾长石^(40)Ar-^(39)Ar同位素年龄为(103.9±1.0)Ma,表明高松山金矿形成时代为早白垩世晚期;全岩元素地球化学特征显示高松山金矿床赋矿围岩的板子房组和宁远村组火山岩以高硅、富碱性组分、富铝以及显著贫镁和钙为特征,轻稀土和大离子亲石元素相对富集,重稀土元素和Nb、Ta、Ti等高场强元素相对亏损,显示出弧岩浆的地球化学特征。结合前人研究成果资料,进一步证实其形成于与古太平洋板块俯冲回撤作用有关的弧后伸展构造环境。The Gaosongshan gold deposit represents one of the most significant epithermal gold deposits identified in the northern Lesser Khingan Range region of northeast China.The gold orebodies are predominantly hosted within the intensely altered volcanic rocks of the Lower Cretaceous Banzifang and Ningyuancun Formations,manifesting primarily as veinlets and veins.Despite the deposit’s significance,research on the ore-bearing wall rocks remains relatively underdeveloped.To elucidate the genesis and formation ages of these rocks,comprehensive isotopic dating and elemental geochemical analyses have been undertaken.The dacite of Banzifang Formation obtained ^(206)Pb/^(238)U surface ages ranging from 112.1 to 115.9 Ma,as determined by zircon laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS)U-Pb dating.Additionally,^(40)Ar-^(39)Ar dating was conducted using multiple collector noble gas mass spectrometry with the Helix MC on plagioclase and feldspar samples collected from the andesite of the Banzifang Formation and the rhyolite of the Ningyuancun Formation within the Gaosongshan deposit,resulting in plateau ages of(111.2±0.9)Ma and(103.9±1.0)Ma,respectively.The dates,obtained through two independent geochronological methods,suggest that the wall rocks of the Gaosongshan deposit were formed during the late period of Early Cretaceous,rather than the Early Cretaceous as previously believed.Major and trace element analyses reveal that the volcanic rocks of the Banzifang and Ningyuancun Formations exhibit similar geochemical characteristics.Both formations are characterized by high silicon content(SiO2=62.26%~71.07%),enriched alkali(Alk=7.28~9.28),elevated aluminum levels(A/CNK=1.15~1.80),and low calcium content(CaO=0.09%~2.03%)and depeled magnesium(MgO=0.47%~3.95%)belonging to shoshonite series.The rocks exhibit an enrichment in light rare earth elements(LREE)and large ion lithophile elements,while showing a depletion in heavy rare earth elements(HREE)and high field strength elements such as Nb,Ta,and Ti,

关 键 词：赋矿围岩 同位素年代学 岩石地球化学 形成环境 小兴安岭北麓 高松山金矿 

分 类 号：P618.51[天文地球—矿床学]