地学前缘 ›› 2026, Vol. 33 ›› Issue (3): 445-470.DOI: 10.13745/j.esf.sf.2025.1.41

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华北克拉通辽东半岛白云金矿床成矿背景及成因类型

蔡哲鑫1,2(), 高强2,*(), 于皓丞2,3, 崔涛2, 王时予2, 滕卓尔2, 何奕凝2,4, 冯海5, 鞠楠3, 邱昆峰2   

  1. 1.北京大学造山带与地壳演化教育部重点实验室, 地球与空间科学学院, 北京 100871
    2.中国地质大学(北京)地质过程与成矿预测全国重点实验室, 教育部深时数字地球前沿科学中心, 北京 100083
    3.自然资源部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
    4.爱丁堡大学地球科学学院, 爱丁堡 EH8 9YL
    5.辽宁招金白云黄金矿业有限公司, 辽宁 丹东 118107
  • 收稿日期:2025-10-01 修回日期:2025-11-11 出版日期:2026-05-25 发布日期:2026-03-26
  • 通信作者: *高 强(1997—),男,博士后,从事区域成矿规律研究工作。E-mail: gaoqgeo@163.com
  • 作者简介:蔡哲鑫(2003—),男,硕士研究生,地质学专业。E-mail: zxcai25@stu.pku.edu.cn
  • 基金资助:
    国家重点研发计划项目(2023YFC2906900);自然资源部深部金矿勘查开采技术创新中心开放课题(LDKF-2023BZX-17);国家自然科学基金国际(地区)合作与交流项目(42261134535);中国地质调查局东北地质科技创新中心区创基金项目(QCJJ2023-06);深时数字地球前沿科学中心项目(2652023001);山东省地质矿产勘查开发局第六地质大队技术研究项目(LDKJ20240101);山东省泰山学者工程项目(tstp20240847)

Metallogenic setting and ore genesis of the Baiyun gold deposit on the Liaodong Peninsula, North China Craton

CAI Zhexin1,2(), GAO Qiang2,*(), YU Haocheng2,3, CUI Tao2, WANG Shiyu2, TENG Zhuo’er2, HE Yining2,4, FENG Hai5, JU Nan3, QIU Kunfeng2   

  1. 1. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China
    2. State Key Laboratory of Geological Processes and Mineral Resources, Frontiers Science Center for Deep-Time Digital Earth, Ministry of Education, China University of Geosciences (Beijing), Beijing 100083, China
    3. Shenyang Center of China Geological Survey (Northeast Geological S&T Innovation Center), Ministry of Natural Resources, Shenyang 110034, China
    4. School of GeoSciences, The University of Edinburgh, Edinburgh EH8 9YL, United Kingdom
    5. Liaoning Zhaojin Baiyun Gold Mining Corporation, Dandong 118107, China
  • Received:2025-10-01 Revised:2025-11-11 Online:2026-05-25 Published:2026-03-26

摘要:

辽东半岛白云金矿床是华北克拉通东缘的重要金成矿单元。其成矿时代存在晚三叠世与早白垩世的争议,成因类型也未形成统一认识,这些问题制约了对区域成矿规律的认识。厘清白云金矿床的成矿时代与成因类型,既可以深化对华北克拉通东缘中生代构造-岩浆-成矿事件的时空格架、动力学机制的理解,也能为区域金矿找矿勘查部署提供参考。本文综合国内外相关文献,系统梳理了白云金矿床的区域地质背景、矿床地质特征、中生代大地构造演化、岩浆活动及金成矿年代学研究成果,并对比讨论了辽东与胶东金矿床在成矿流体、物质特征及成矿动力学背景方面的异同。辽东半岛中生代构造演化受晚三叠世古亚洲洋闭合-拼贴,以及早白垩世古太平洋板块俯冲事件控制,发育显著的岩浆活动与金成矿作用。基于区域大地构造演化的年代学格架,本文系统评析前人针对白云金矿床的成矿年代学研究。由于金红石、磷钇矿及石英等副矿物与金成矿不存在必然的成因联系,其测年体系封闭温度也显著高于成矿温度,本文认为前人通过金矿石副矿物的晚三叠世测年结果可能记录古亚洲洋闭合后伸展阶段的构造-热事件,而成矿前后岩浆岩的锆石U-Pb年龄有力地将成矿时代约束至早白垩世(126 Ma)。成矿流体包裹体均一温度(125.42~388.31 ℃)、盐度w(NaCleq)(0.12%~15.90%)及成矿阶段石英氧同位素组成指示其为中低温、变质热液为主导的成矿系统,黄铁矿流体包裹体氦-氩同位素比值则揭示成矿流体呈现壳幔混合源区特征。金矿石金属硫化物的硫-铅同位素组成示踪成矿物质可能来自地层。通过与典型的胶东型金矿床进行对比,揭示二者成矿时代、成矿动力学背景、成矿流体、蚀变类型等方面高度统一。本文认为白云金矿床是早白垩世华北克拉通东缘大规模金成矿事件的组成部分,且属于胶东型金成矿系统在辽东的特殊地质表达。

关键词: 白云金矿床, 成矿年代学, 矿床成因, 胶东型金矿, 辽东半岛

Abstract:

The Baiyun gold deposit on the Liaodong Peninsula, situated along the eastern margin of the North China Craton (NCC), is a key metallogenic unit whose mineralization age has been debated between the Late Triassic and the Early Cretaceous, and whose genetic interpretation also remains contentious. This ambiguity hampers a comprehensive understanding of regional metallogenic processes. Constraining the timing and genesis of the Baiyun deposit is therefore crucial not only for refining the spatiotemporal framework and dynamics of Mesozoic tectono-magmatic-metallogenic events along the NCC margin, but also for informing regional gold exploration strategies. This study reviews published research on the regional geology, deposit geology, and Mesozoic geodynamic evolution of Liaodong, which was governed by the Late Triassic closure and amalgamation of the paleo-Asian ocean and by the Early Cretaceous subduction of the paleo-Pacific Plate beneath the NCC. Within this regional geochronological framework, we critically reassess previously reported metallogenic ages for Baiyun. Because rutile U-Pb, xenotime U-Pb, and quartz Ar-Ar chronometers lack demonstrable genetic linkage to gold mineralization and possess closure temperatures far exceeding estimated ore-forming temperatures, the Late Triassic ages yielded by these systems are unlikely to date mineralization. Instead, they probably record tectono-thermal events related to post-collisional extension following the closure of the paleo-Asian Ocean. In contrast, U-Pb zircon ages from pre- and post-mineralization intrusive rocks robustly constrain the metallogenic timing to the Early Cretaceous (126 Ma). Fluid-inclusion homogenization temperatures (125.42-388.31 ℃), salinities w(NaCleq) (0.12%-15.90%), and quartz oxygen-isotope compositions indicate Baiyun a low- to moderate- temperature hydrothermal system dominated by metamorphic fluids. Helium-argon isotopic ratios of pyrite fluid inclusions reveal a mixed crust-mantle source for the ore-forming fluids, whereas sulfur and lead isotopes of sulfides suggest that gold-related metals and sulfur were sourced chiefly from stratigraphy. Comparison with typical Jiaodong-type gold deposits reveals close correspondence in mineralization age, geodynamics, ore-forming fluids, and alteration characteristics. Taken together, therefore, these lines of evidence indicate that the Baiyun gold deposit constitutes the Liaodong manifestation of the Early Cretaceous, large-scale gold mineralization event along the eastern margin of the North China Craton and is most plausibly interpreted as a Jiaodong-type mineral system.

Key words: Baiyun gold deposit, metallogenic age, metallogenesis, Jiaodong-type gold deposit, Liaodong Peninsula

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