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SEM and FIB-TEM analyses on nanoparticulate arsenian pyrite: Implications for Au enrichment in the Carlin-type giant Lannigou gold deposit, SW China

  • Jun Yan , Ruizhong Hu , Jean S. Cline , Shanling Fu ORCID logo and Shirong Liu
Published/Copyright: December 31, 2023
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American Mineralogist
From the journal American Mineralogist Volume 109 Issue 1

Abstract

Gold in Carlin-type gold ores is commonly hosted in the arsenian pyrite rim, but the formation of arsenian pyrite and its contribution to Au adsorption are poorly understood. Based on our previous NanoSIMS Au mapping, we conducted SEM and HR-TEM analyses to examine the Au deportment and nanoscale texture of individual auriferous arsenian pyrite grains from the giant Carlin-type Lannigou gold deposit, SW China. The results indicate that the arsenian pyrite rim is composed of numerous nanoparticulate pyrite grains (rather than a single crystal), and gold nanoparticles (Au0) occur mainly in sub-rim with the highest Au content, which are porous and have lower degrees of order. We propose that nanoparticulate arsenian pyrite attachment and aggregation is the main mechanism for the arsenian pyrite rim growth, and such mechanism is crucial for the Au efficient enrichment for this giant gold deposit.

Keywords: Nanoparticulate arsenian pyrite; nano-pore; FIB-TEM; Au efficient enrichment; Carlin-type gold deposits

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Received: 2022-04-11
Accepted: 2023-02-01
Published Online: 2023-12-31
Published in Print: 2024-01-29

© 2023 by Mineralogical Society of America

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https://doi.org/10.2138/am-2022-8550
Keywords for this article
Nanoparticulate arsenian pyrite; nano-pore; FIB-TEM; Au efficient enrichment; Carlin-type gold deposits

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  3. Melt-mediated re-equilibration of zircon produced during meltdown of the Chernobyl reactor
  4. High-pressure behavior and structural transition of beryl-type johnkoivulaite, Cs(Be2B)Mg2Si6O18
  5. Subsolidus breakdown of armalcolite: Constraints on thermal effects during shock lithification of lunar regolith
  6. Melting and melt segregation processes controlling granitic melt composition
  7. Magmatic degassing controlled the metal budget of the Axi epithermal gold deposit, China
  8. Formation of mixed-layer sulfide-hydroxide minerals from the Tochilinite-Valleriite group during experimental serpentinization of olivine
  9. Two discrete gold mineralization events recorded by hydrothermal xenotime and monazite, Xiaoqinling gold district, central China
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