中国地质调查2026，Vol.13Issue(4)：33-46,14.DOI:10.19388/j.zgdzdc.2025.235
黑龙江省嫩江—黑河地区铜金矿床成矿类型、成矿作用及找矿方向
Mineralization types,mineralization processes,and prospecting directions of Cu-Au deposits in Nenjiang-Heihe area of Heilongjiang Province
摘要
Abstract
Nenjiang-Heihe area is located in the northeastern segment of the eastern Ujimqin Banner-Nenjiang metallogenic belt in Great Khingan Range,and it constitutes an important Cu-Au production base in Hei-longjiang Province.A series of achievements have been obtained in geological prospecting in recent years,never-theless,the relationship between ore-controlling structures and mineralization remains unclear.Based on region-al geological setting,geological features of deposits and isotopic geochemistry,the authors in this study analyzed the mineralization types and mineralization processes,and discussed future prospecting directions.The results showed that Duobaoshan island-arc belt was predominantly characterized by porphyry Cu deposit,which experi-enced mineralization mainly in the Early Ordovician and superimposed mineralization structure in the Late Ordovi-cian.Kolo-Xinkailing tectonic mélange belt hosted ductile shear-zone-type and epithermal-type Au depos-its,which formed mainly in the Early Cretaceous.S and Pb isotope data revealed that ore-forming materials of porphyry Cu deposits in Duobaoshan island-arc belt were predominantly mantle-derived,whereas the Au de-posits in Kolo-Xinkailing mélange belt exhibited crust-mantle mixed sources.Fluid-inclusion characteristics showed that ore-forming fluids in Duobaoshan belt featured wide ranges of temperature and salinity,high CO2 contents,and local reduction signals in the late stage.Significant fluid-boiling occurred in the main metallogenic stage of the porphyry copper deposit.The ore-forming fluids in Kolo-Xinkailing tectonic mélange belt were characterized by low temperature,low salinity and low density.H-O isotopes suggested that ore-forming fluids of porphyry-type Cu deposits exhibited magmatic-hydrothermal characteristics with intensive water-rock inter-actions under high-temperature conditions,and the ore-forming fluids of epithermal Au deposits were domina-ted by meteoric water.Three key metallogenic episodes were recognized in Nenjiang-Heihe area.The first epi-sode was the Ordovician Cu-Au mineralization related to the subduction of the Paleo-Asian Ocean.The second episode was the Triassic Cu-Au mineralization associated with the subduction and closure of Mongol-Okhotsk Ocean.The third episode was the Early Cretaceous Au mineralization triggered by the closure of Mongol-Okhotsk Ocean together with subduction roll-back of the Paleo-Pacific Ocean.These understandings have improved the Cu-Au metallogenic mechanism under the background of multi-tectonic domain superposition in the northern Great Khingan Range,and could provide important theoretical basis for target optimization and exploration deploy-ment of Cu-Au deposits in Nenjiang-Heihe area.关键词
铜金矿床/矿床类型/时空分布特征/成矿作用/嫩江—黑河地区Key words
Cu-Au deposit/deposit type/spatio-temporal distribution characteristics/mineralization/Nenjiang-Heihe area分类
天文与地球科学引用本文复制引用
陈宇,苗志风,陈桂虎,李铁生,孙靖尧..黑龙江省嫩江—黑河地区铜金矿床成矿类型、成矿作用及找矿方向[J].中国地质调查,2026,13(4):33-46,14.基金项目
中国地质调查局"吉中成矿带蛟河地区金矿资源潜力评价(编号:DD20242940)"和"黑龙江黑河三道湾子一带金矿资源潜力评价(编号:DD20230395)"项目联合资助. （编号:DD20242940）
