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<p>The source of the gold in Carlin-type deposits has been debated ever since this unusual gold deposit-type was first discovered in the Carlin district of Nevada (USA) more than sixty years ago, with magmatic, metamorphic, sedimentary, and hybrid sources having been proposed. The current study used scanning electron microscopy and high-resolution transmission electron microscopy to investigate the carbonaceous sedimentary rocks associated with the Baidi deposit in the Golden Triangle Carlin-type gold district of southwest China. The results indicate that these rocks contain gold nanoparticles and microparticles, and gold-bearing framboidal pyrite (mean 0.14 ppm gold; up to 0.47 ppm gold). These findings, coupled with the observations that coeval magmatism associated with gold mineralization was generally absent in the Golden Triangle district and that gold-rich carbonaceous sedimentary rocks are also present in the Carlin district, support the hypothesis that carbonaceous sedimentary rocks were the source of the gold in Carlin-type deposits.</p>

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The source of the gold in Carlin-type gold deposits

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月13日

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  • Mingchun Chai,
  • Anthony E. Williams-Jones,
  • Wenchao Su,
  • Cheng Xu,
  • Wei Fu

摘要

The source of the gold in Carlin-type deposits has been debated ever since this unusual gold deposit-type was first discovered in the Carlin district of Nevada (USA) more than sixty years ago, with magmatic, metamorphic, sedimentary, and hybrid sources having been proposed. The current study used scanning electron microscopy and high-resolution transmission electron microscopy to investigate the carbonaceous sedimentary rocks associated with the Baidi deposit in the Golden Triangle Carlin-type gold district of southwest China. The results indicate that these rocks contain gold nanoparticles and microparticles, and gold-bearing framboidal pyrite (mean 0.14 ppm gold; up to 0.47 ppm gold). These findings, coupled with the observations that coeval magmatism associated with gold mineralization was generally absent in the Golden Triangle district and that gold-rich carbonaceous sedimentary rocks are also present in the Carlin district, support the hypothesis that carbonaceous sedimentary rocks were the source of the gold in Carlin-type deposits.