Crystalline placer gold from the Rio Neuquén, Argentina: Implications for the gold budget in placer gold formation
Recent fluvial sediments of the Rio Neuquén, Argentina, contain variable amounts of placer gold. In addition to rounded, detrital placer gold, the sediments also contain pristine crystalline gold (type 1 gold), which occurs as overgrowths on detrital placer gold cores. Type 1 gold is locally rimmed...
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2003
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03610128_v98_n3_p623_McCready http://hdl.handle.net/20.500.12110/paper_03610128_v98_n3_p623_McCready |
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paper:paper_03610128_v98_n3_p623_McCready2023-06-08T15:34:50Z Crystalline placer gold from the Rio Neuquén, Argentina: Implications for the gold budget in placer gold formation Fluvial sediments Contamination Crystalline materials Gold Sediments Geology geochemistry gold ore deposit placer deposit source rock Argentina Recent fluvial sediments of the Rio Neuquén, Argentina, contain variable amounts of placer gold. In addition to rounded, detrital placer gold, the sediments also contain pristine crystalline gold (type 1 gold), which occurs as overgrowths on detrital placer gold cores. Type 1 gold is locally rimmed by gold with a wormlike or crystalline texture (type 2 gold). The chemistry of the primary cores indicates variable intragrain and intergrain compositional heterogeneity. This is interpreted to indicate'a multisource origin. Type 1 gold is composed of virtually pure gold (>98 at. % Au) and type 2 gold is an Au-Hg amalgam (4-9 at. % Hg). Both varieties are authigenic in origin. The formation of the virtually pure type 1 gold is interpreted to be due to the addition of Au from an external source, rather than by the removal of Ag and other metals. The AuHgAg type 2 gold is interpreted to be due to Hg contamination from historic mining. Type 1 gold is interpreted to be analogous to the Ag-poor rims present on many placer gold grains. The evidence presented in this study supports the view that the Ag-poor rims on placer gold grains are the result of Au addition and not Ag removal. This study also has implications for both quantitative morphological and paragenetic studies of placer gold grains. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03610128_v98_n3_p623_McCready http://hdl.handle.net/20.500.12110/paper_03610128_v98_n3_p623_McCready |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Fluvial sediments Contamination Crystalline materials Gold Sediments Geology geochemistry gold ore deposit placer deposit source rock Argentina |
| spellingShingle |
Fluvial sediments Contamination Crystalline materials Gold Sediments Geology geochemistry gold ore deposit placer deposit source rock Argentina Crystalline placer gold from the Rio Neuquén, Argentina: Implications for the gold budget in placer gold formation |
| topic_facet |
Fluvial sediments Contamination Crystalline materials Gold Sediments Geology geochemistry gold ore deposit placer deposit source rock Argentina |
| description |
Recent fluvial sediments of the Rio Neuquén, Argentina, contain variable amounts of placer gold. In addition to rounded, detrital placer gold, the sediments also contain pristine crystalline gold (type 1 gold), which occurs as overgrowths on detrital placer gold cores. Type 1 gold is locally rimmed by gold with a wormlike or crystalline texture (type 2 gold). The chemistry of the primary cores indicates variable intragrain and intergrain compositional heterogeneity. This is interpreted to indicate'a multisource origin. Type 1 gold is composed of virtually pure gold (>98 at. % Au) and type 2 gold is an Au-Hg amalgam (4-9 at. % Hg). Both varieties are authigenic in origin. The formation of the virtually pure type 1 gold is interpreted to be due to the addition of Au from an external source, rather than by the removal of Ag and other metals. The AuHgAg type 2 gold is interpreted to be due to Hg contamination from historic mining. Type 1 gold is interpreted to be analogous to the Ag-poor rims present on many placer gold grains. The evidence presented in this study supports the view that the Ag-poor rims on placer gold grains are the result of Au addition and not Ag removal. This study also has implications for both quantitative morphological and paragenetic studies of placer gold grains. |
| title |
Crystalline placer gold from the Rio Neuquén, Argentina: Implications for the gold budget in placer gold formation |
| title_short |
Crystalline placer gold from the Rio Neuquén, Argentina: Implications for the gold budget in placer gold formation |
| title_full |
Crystalline placer gold from the Rio Neuquén, Argentina: Implications for the gold budget in placer gold formation |
| title_fullStr |
Crystalline placer gold from the Rio Neuquén, Argentina: Implications for the gold budget in placer gold formation |
| title_full_unstemmed |
Crystalline placer gold from the Rio Neuquén, Argentina: Implications for the gold budget in placer gold formation |
| title_sort |
crystalline placer gold from the rio neuquén, argentina: implications for the gold budget in placer gold formation |
| publishDate |
2003 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03610128_v98_n3_p623_McCready http://hdl.handle.net/20.500.12110/paper_03610128_v98_n3_p623_McCready |
| _version_ |
1768543371579621376 |