地质与勘探2026，Vol.62Issue(2)：322-341,20.DOI:10.12134/j.dzykt.2026.02.009
黑龙江三合屯金矿床早白垩世成矿作用及找矿意义
Early Cretaceous Mineralization and Prospecting Significance of the Sanhetun Gold Deposit in Heilongjiang Province:Evidence from Geochemistry and Isotopic Geochronology of Diorite-Prophyrite
摘要
Abstract
Abstrace:The Sanhetun gold deposit is located in the southern part of the Duobaoshan NE-SW-trending Early Cretaceous gold metallogenic belt within the Mesozoic Circum-Pacific Metallogenic Domain.It contains proven gold resources of 4.4 t,with a highest gold grade of 23.70 g/t and the highest associated silver grade of 135.82 g/t,indicative of significant exploration potential.However,the unclear metallogenic age and prospecting criteria of this deposit have constrained further exploration breakthroughs in the deep and marginal areas of the region.To determine the metallogenic age,the genesis and prospecting criteria of the deposit,this study conducted systematic field geological surveys,drill core logging,petrogeochemical analysis,and Rb-Sr isotopic dating.Results show that:(1)The diorite porphyrite is spatially consistent with the gold ore bodies,and the metallogenic-stage quartz-pyrite veins are closely related to gold mineralization.(2)Rb-Sr isotopic dating yields a metallogenic age of 115.7±9.1 Ma and a diorite porphyrite age of 120±2 Ma,both belonging to the Early Cretaceous,with mineralization occurring slightly later than magmatic activity.(3)The diorite porphyrite belongs to the sub-alkaline series,enriched in large ion lithophile elements(Ba,K,Sr)and depleted in high field strength elements(Nb,Ta,Zr,Th)and heavy rare earth elements,with zircon εHf(t)values ranging from 4.7 to 7.6.(4)The ⁸⁷Sr/⁸⁶Sr ratios of the quartz-pyrite assemblage range from 0.70654 to 0.71089,indicating that the ore-forming materials were mainly derived from a mantle source.Based on the regional metallogenic background,the Sanhetun gold deposit was formed in an Early Cretaceous extensional tectonic setting,which is a hydrothermal gold deposit related to diorite porphyrite.The diorite porphyrite is proposed as an important prospecting criterion for Early Cretaceous hydrothermal gold deposits in the Duobaoshan area.This study provides chronological and geochemical evidence for the deployment of regional gold exploration.关键词
闪长玢岩/地球化学/Rb-Sr等时线年龄/白垩世/三合屯金矿/多宝山地区/黑龙江Key words
diorite-porphyrite/geochemistry/Rb-Sr isochron age/Cretaceous/Sanhetun gold deposit/Duobaoshan area/Heilongjiang Province分类
天文与地球科学引用本文复制引用
杨元江,李成禄,李旭东,谷华娟,刘宝山,侯占德,李博文..黑龙江三合屯金矿床早白垩世成矿作用及找矿意义[J].地质与勘探,2026,62(2):322-341,20.基金项目
黑龙江省自然科学基金项目(编号:LH2023D025)、黑龙江省地质矿产局科研项目(编号:HKY202301)和中国地质调查局东北地质科技创新中心区创基金项目(编号:QCJJ2023-11)联合资助. （编号:LH2023D025）
