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<p>The Gangdese metallogenic belt in Tibet, located between the Indus-Yarlung Zangbo and Bangong-Nujiang suture zones, represents a typical collisional orogenic system with significant mineral potential. Post-collisional extensional processes enabled the formation of magmatic-hydrothermal systems that generated cryptoexplosive breccia-type deposits. Integrated magnetotelluric (MT) and audio-magnetotelluric (AMT) data inversion in this study revealed the electrical structure of the Narusongduo mining area to a depth of 5 km, enabling a comprehensive analysis of the alteration and mineralization system. The resulted model identified steeply dipping fracture zones within low-resistivity (100–500 Ω·m) regions between high-resistivity (&gt;1000Ω·m) granite porphyries, interpreted as pathways for deep magma ascent. A shallow (0.1–0.3 km) laterally continuous caprock composed of tuff exhibited medium-to-high resistivity (500–1000 Ω·m) and acted as a critical trapping structure for the formation of gas-phase cryptoexplosive breccia pipes. The interaction between these deep low-resistivity magma pathways and the high-resistivity cap rocks formed a characteristic electrical structure that controls breccia formation and mineralization. These findings enhance the understanding of epithermal breccia-pipe deposits in the Gangdese metallogenic belt and provide an important geophysical model for exploring analogous deposits in post-collisional orogenic settings worldwide.</p>

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Electrical Structure of the Narusongduo Cryptoexplosive Breccia Deposit, Gangdese Belt, Tibet: Insights from Integrated MT/AMT Data Inversion and Implications for Mineral Exploration

  • 期刊论文

  • 发表日期：

    2026年2月21日

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  • Hui-cui Xin,
  • Zhi-min Xu,
  • Guang Li,
  • Cong Zhou,
  • Zhi-ning Jia

摘要

The Gangdese metallogenic belt in Tibet, located between the Indus-Yarlung Zangbo and Bangong-Nujiang suture zones, represents a typical collisional orogenic system with significant mineral potential. Post-collisional extensional processes enabled the formation of magmatic-hydrothermal systems that generated cryptoexplosive breccia-type deposits. Integrated magnetotelluric (MT) and audio-magnetotelluric (AMT) data inversion in this study revealed the electrical structure of the Narusongduo mining area to a depth of 5 km, enabling a comprehensive analysis of the alteration and mineralization system. The resulted model identified steeply dipping fracture zones within low-resistivity (100–500 Ω·m) regions between high-resistivity (>1000Ω·m) granite porphyries, interpreted as pathways for deep magma ascent. A shallow (0.1–0.3 km) laterally continuous caprock composed of tuff exhibited medium-to-high resistivity (500–1000 Ω·m) and acted as a critical trapping structure for the formation of gas-phase cryptoexplosive breccia pipes. The interaction between these deep low-resistivity magma pathways and the high-resistivity cap rocks formed a characteristic electrical structure that controls breccia formation and mineralization. These findings enhance the understanding of epithermal breccia-pipe deposits in the Gangdese metallogenic belt and provide an important geophysical model for exploring analogous deposits in post-collisional orogenic settings worldwide.