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<p>The Late Yanshanian granite belt in the Yidun Island Arc of western Sichuan constitutes a critical rare metal metallogenic zone along the eastern margin of the Tibetan Plateau, yet its deep-seated resource distribution has remained poorly understood. Focusing on the northern contact zone of Hagala rock mass, this study innovatively integrates geological mapping, high-power induced polarization (IP) sounding (AB/2=1500m, MN=20m), and 3D modeling to systematically constrain the spatial architecture and resource potential of deep-seated ore bodies. Key fi ndings include: (1) Surface discovery of 12 NW-trending pegmatitetype Nb-Ta-Li-Be veins, with the No.3 principal vein exhibiting maximum dimensions (850m length × 5–15m width) and average grades of 0.031% Ta<sub>2</sub>O<sub>5</sub> and 0.017% Nb<sub>2</sub>O<sub>5</sub> - significantly exceeding industrial thresholds (0.012%), while Li<sub>2</sub>O (0.55%) and Rb<sub>2</sub>O (0.24%) reach cutoff grades; (2) IP sounding reveals spatial correlation between deep high-resistivity anomalies (4,684 Ω·m) and low polarization rates (1.28%), with 3D inversion demonstrating NE-dipping extensions exceeding 800m depth, establishing a geometrically constrained mineralization model of 2.28 million m<sup>3</sup> volume; (3) Resource estimates for the No.3 vein yield 35,000 tonnes Li<sub>2</sub>O and 15,000 tonnes Rb<sub>2</sub>O, with 1,981 tonnes Ta<sub>2</sub>O<sub>5</sub> and 1,086 tonnes Nb<sub>2</sub>O<sub>5</sub> metal content, confi rming large-scale rare metal deposit potential. The developed geology-geophysics collaborative exploration framework establishes a paradigm for rare metal prospecting in collisional orogenic belts.</p>

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Integrated Geology-Geophysics Exploration of Rare Metal Deposits in the Yidun Island Arc Collisional Orogen

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • Rong Yang,
  • Yu Peng,
  • Li Qing,
  • Qian-kun Liu,
  • Xue-feng Hao,
  • Han Wu,
  • Jun-bo Fan,
  • Hong-juan Chen,
  • Tao Yang

摘要

The Late Yanshanian granite belt in the Yidun Island Arc of western Sichuan constitutes a critical rare metal metallogenic zone along the eastern margin of the Tibetan Plateau, yet its deep-seated resource distribution has remained poorly understood. Focusing on the northern contact zone of Hagala rock mass, this study innovatively integrates geological mapping, high-power induced polarization (IP) sounding (AB/2=1500m, MN=20m), and 3D modeling to systematically constrain the spatial architecture and resource potential of deep-seated ore bodies. Key fi ndings include: (1) Surface discovery of 12 NW-trending pegmatitetype Nb-Ta-Li-Be veins, with the No.3 principal vein exhibiting maximum dimensions (850m length × 5–15m width) and average grades of 0.031% Ta2O5 and 0.017% Nb2O5 - significantly exceeding industrial thresholds (0.012%), while Li2O (0.55%) and Rb2O (0.24%) reach cutoff grades; (2) IP sounding reveals spatial correlation between deep high-resistivity anomalies (4,684 Ω·m) and low polarization rates (1.28%), with 3D inversion demonstrating NE-dipping extensions exceeding 800m depth, establishing a geometrically constrained mineralization model of 2.28 million m3 volume; (3) Resource estimates for the No.3 vein yield 35,000 tonnes Li2O and 15,000 tonnes Rb2O, with 1,981 tonnes Ta2O5 and 1,086 tonnes Nb2O5 metal content, confi rming large-scale rare metal deposit potential. The developed geology-geophysics collaborative exploration framework establishes a paradigm for rare metal prospecting in collisional orogenic belts.