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<p>The Bozhushan ore cluster (BOC), a critical component of the W-Sn polymetallic metallogenic belt in western South China, contains over 10 mineral deposits (or ore occurrences) in its central region, with the main mineralization stage dated to approximately 88&#xa0;Ma. This study focuses on the Guanfang deposit (GFD, southern sector) and the Donggualin deposit (DGLD, northern sector) within the BOC. <i>In situ</i> LA-ICP-MS U–Pb geochronology of titanite and garnet from the DGLD yields Tera-Wasserburg lower intercept ages of 98.3&#xa0;±&#xa0;5.7&#xa0;Ma (MSWD&#xa0;=&#xa0;0.53, <i>n</i>&#xa0;=&#xa0;24) and 100.28&#xa0;±&#xa0;9.97&#xa0;Ma (MSWD&#xa0;=&#xa0;0.53, <i>n</i>&#xa0;=&#xa0;23), respectively. Integrated with previous studies, these results suggest the existence of two independent skarn mineralization events in the ore cluster: an early stage (~&#xa0;98&#xa0;Ma) and a later stage (~&#xa0;88&#xa0;Ma). Geochemical analyses reveal that the ore-forming fluids during the main mineralization stage (~&#xa0;88&#xa0;Ma) exhibited higher ƒO₂ compared to the early stage (~&#xa0;98&#xa0;Ma). The high W and Sn contents in garnet indicate that the DGLD and GFD (~&#xa0;98&#xa0;Ma,&#xa0;~&#xa0;88&#xa0;Ma) have significant W-Sn mineralization potential. Titanite Sn element data further suggest that the&#xa0;~&#xa0;88&#xa0;Ma mineralization stage has a greater Sn enrichment potential relative to the&#xa0;~&#xa0;98&#xa0;Ma stage. These findings enhance the understanding of regional metallogenic processes and provide novel insights for future exploration targeting.</p>

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In situ U–Pb dating and trace element of garnet and titanite as indicators of the age and ore-forming condition of skarn deposit: A case study of the Guanfang-Donggualin deposits in southern Yunnan, China

  • 期刊论文

  • 发表日期：

    2025年12月9日

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  • Zhipeng Li,
  • Yangyang Ren,
  • Yi Liu,
  • Zhigang Kong,
  • Youpu Dong,
  • Xuelong Liu,
  • Guangshu Yang

摘要

The Bozhushan ore cluster (BOC), a critical component of the W-Sn polymetallic metallogenic belt in western South China, contains over 10 mineral deposits (or ore occurrences) in its central region, with the main mineralization stage dated to approximately 88 Ma. This study focuses on the Guanfang deposit (GFD, southern sector) and the Donggualin deposit (DGLD, northern sector) within the BOC. In situ LA-ICP-MS U–Pb geochronology of titanite and garnet from the DGLD yields Tera-Wasserburg lower intercept ages of 98.3 ± 5.7 Ma (MSWD = 0.53, n = 24) and 100.28 ± 9.97 Ma (MSWD = 0.53, n = 23), respectively. Integrated with previous studies, these results suggest the existence of two independent skarn mineralization events in the ore cluster: an early stage (~ 98 Ma) and a later stage (~ 88 Ma). Geochemical analyses reveal that the ore-forming fluids during the main mineralization stage (~ 88 Ma) exhibited higher ƒO₂ compared to the early stage (~ 98 Ma). The high W and Sn contents in garnet indicate that the DGLD and GFD (~ 98 Ma, ~ 88 Ma) have significant W-Sn mineralization potential. Titanite Sn element data further suggest that the ~ 88 Ma mineralization stage has a greater Sn enrichment potential relative to the ~ 98 Ma stage. These findings enhance the understanding of regional metallogenic processes and provide novel insights for future exploration targeting.