@article{fdi:010095298,
  title = {{M}ercury isotope constraints on artisanal and small-scale gold mining source contributions and redox cycling in the {Y}anomami {I}ndigenous {T}erritory},
  author = {{G}arnier, {J}. and {M}artin, {L}. {A}. and {S}onke, {J}. {E}. and {S}ouza, {J}. and {Q}uintarelli, {J}. and {K}utter, {V}. and {R}oig, {H}. and {B}onnet, {M}arie-{P}aule and {M}aurice, {L}aurence and {A}dam, {E}. {A}. {M}. and {S}eyler, {P}atrick},
  editor = {},
  language = {{ENG}},
  abstract = {{A}rtisanal and small-scale gold mining ({ASGM}) is a major source of mercury ({H}g) contamination in tropical ecosystems, yet tracing {H}g sources and transformations remains challenging. {T}his study investigates {H}g dynamics in the {Y}anomami {I}ndigenous {T}erritory ({B}razil), a remote and ecologically sensitive region severely affected by illegal {ASGM} and a recent humanitarian-environmental crisis. {W}e integrate mineralogical, geochemical, and total {H}g data with {H}g stable isotope analyses (delta 202{H}g and {D}elta 199{H}g) from soils, sediments, suspended particulate matter ({SPM}), and liquid {H}g to assess contamination sources and biogeochemical behavior. {H}g concentrations reach up to 8470 ng & sdot;g-1 in {SPM}, with isotopic signatures reflecting both natural and anthropogenic inputs. {A} binary isotope mixing model based on delta 202{H}g reveals variable {ASGM}-derived contributions. {T}hree distinct groups emerge: (1) a {S}ource {M}ixing {G}roup showing a continuum between natural and {ASGM} inputs; (2) a {H}otspot {G}roup with high {H}g concentrations and isotopic signatures resembling {ASGM} liquid {H}g; and (3) a {R}edox-{P}rocess {G}roup with isotopic deviations indicative of in situ redox-driven transformations under oxic-anoxic gradients. {T}o support interpretation in complex settings, we propose a simplified, semi-quantitative framework integrating source apportionment and environmental processes. {T}his tool enhances environmental forensics and risk assessment in {ASGM}-impacted areas.},
  keywords = {{S}ource apportionment ; {R}edox cycling ; {G}old-mining ; {A}mazon {B}asin ; {BRESIL} ; {AMAZONIE} ; {AMAZONE} {BASSIN}},
  booktitle = {},
  journal = {{J}ournal of {H}azardous {M}aterials},
  volume = {498},
  numero = {},
  pages = {139892 [12 p.]},
  ISSN = {0304-3894},
  year = {2025},
  DOI = {10.1016/j.jhazmat.2025.139892},
  URL = {https://www.documentation.ird.fr/hor/fdi:010095298},
}