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<p>The Jiaodong Peninsula hosts one of the world’s largest concentrations of Cretaceous lode Au deposits, yet the genetic link between Au mineralization and coeval felsic–mafic magmatism remains debated. We present whole-rock geochemistry, zircon trace-element oxybarometry, apatite Sr–Nd isotopes, and zircon-hosted apatite volatile data for Mesozoic granites and mafic dikes from the Jiaobei terrane. Three major granite suites formed at 165.5–154.7&#xa0;Ma (Linglong), 136.2–126.3&#xa0;Ma (Guojialing), and 119–116.7&#xa0;Ma (Weideshan). Gold mineralization (126–110&#xa0;Ma) overlaps with the youngest Weideshan suite and late Guojialing intrusions, as well as with mafic–intermediate dike emplacement. A progressive rise in magmatic oxidation state (ΔFMQ) and volatile contents (H₂O–Cl–S), accompanied by increasing ε<sub>Nd</sub>(t) and decreasing (⁸⁷Sr/⁸⁶Sr)<sub>i</sub> values, reflects increasing input from oxidized, volatile-rich mantle-derived mafic magmas into crustal melting regimes. Mafic dikes, especially low-Ti varieties with arc signatures, record the most oxidized conditions and exhibit trace-element patterns comparable to global Au-fertile arc magmas. Hornblende barometry and regional thermochronology indicate that granite emplacement depths decreased from Linglong to Weideshan, coincident with rapid Early Cretaceous crustal uplift that enhanced structural permeability. We propose that hybridization between lower-crustal felsic melts and metasomatized lithospheric-mantle (and locally asthenospheric) magmas generated highly oxidized, hydrous, Au-fertile magmas between 126 and 115&#xa0;Ma. These magmas exsolved Au-bearing fluids that migrated through an evolving extensional fault network, forming some structurally controlled lode Au deposits. Our results link Jiaodong-type Au metallogenesis to slab-fluid-driven mantle metasomatism, felsic–mafic magma interaction, and tectonic unroofing of the eastern North China Craton.</p>

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Unveiling the gold secrets of Jiaodong Peninsula: the role of felsic-mafic arc magmatism in gold deposit formation

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • Lichuan Pan,
  • Haodong He,
  • Haidong Zhang,
  • Zhuojun Xie,
  • Qian Liu,
  • Jingdan Xiao,
  • Chusi Li,
  • Ruizhong Hu

摘要

The Jiaodong Peninsula hosts one of the world’s largest concentrations of Cretaceous lode Au deposits, yet the genetic link between Au mineralization and coeval felsic–mafic magmatism remains debated. We present whole-rock geochemistry, zircon trace-element oxybarometry, apatite Sr–Nd isotopes, and zircon-hosted apatite volatile data for Mesozoic granites and mafic dikes from the Jiaobei terrane. Three major granite suites formed at 165.5–154.7 Ma (Linglong), 136.2–126.3 Ma (Guojialing), and 119–116.7 Ma (Weideshan). Gold mineralization (126–110 Ma) overlaps with the youngest Weideshan suite and late Guojialing intrusions, as well as with mafic–intermediate dike emplacement. A progressive rise in magmatic oxidation state (ΔFMQ) and volatile contents (H₂O–Cl–S), accompanied by increasing εNd(t) and decreasing (⁸⁷Sr/⁸⁶Sr)i values, reflects increasing input from oxidized, volatile-rich mantle-derived mafic magmas into crustal melting regimes. Mafic dikes, especially low-Ti varieties with arc signatures, record the most oxidized conditions and exhibit trace-element patterns comparable to global Au-fertile arc magmas. Hornblende barometry and regional thermochronology indicate that granite emplacement depths decreased from Linglong to Weideshan, coincident with rapid Early Cretaceous crustal uplift that enhanced structural permeability. We propose that hybridization between lower-crustal felsic melts and metasomatized lithospheric-mantle (and locally asthenospheric) magmas generated highly oxidized, hydrous, Au-fertile magmas between 126 and 115 Ma. These magmas exsolved Au-bearing fluids that migrated through an evolving extensional fault network, forming some structurally controlled lode Au deposits. Our results link Jiaodong-type Au metallogenesis to slab-fluid-driven mantle metasomatism, felsic–mafic magma interaction, and tectonic unroofing of the eastern North China Craton.