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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
-
Africa
-
Central Africa
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Gabon (1)
-
-
North Africa
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Algeria
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Ahaggar (1)
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Atlas Mountains
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Moroccan Atlas Mountains
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Anti-Atlas (3)
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-
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Morocco
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Moroccan Atlas Mountains
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Anti-Atlas (3)
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-
-
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West Africa
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Niger (1)
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Canada
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Western Canada
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Athabasca Basin (2)
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Saskatchewan (1)
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Europe
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Alps
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French Alps (1)
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Central Europe
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Switzerland (1)
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Upper Rhine Graben (2)
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Pyrenees (1)
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Southern Europe
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Iberian Peninsula
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Iberian Massif (1)
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Portugal (1)
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Spain (1)
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Spanish Central System (1)
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Western Europe
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France
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Bas-Rhin France
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Soultz-sous-Forets France (1)
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Central Massif
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Montagne Noire (1)
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French Alps (1)
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Hautes-Pyrenees France (1)
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Haut-Rhin France (1)
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Lozere France (1)
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Paris Basin (1)
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North Pyrenean Fault (1)
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Oceania
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Melanesia
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New Caledonia (3)
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commodities
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barite deposits (1)
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brines (5)
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fluorspar deposits (1)
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metal ores
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gold ores (2)
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lead ores (1)
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lead-zinc deposits (1)
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mercury ores (1)
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nickel ores (2)
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silver ores (3)
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tungsten ores (2)
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uranium ores (5)
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zinc ores (1)
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mineral deposits, genesis (10)
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talc deposits (1)
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elements, isotopes
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boron
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B-11/B-10 (1)
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carbon
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C-13/C-12 (3)
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chemical ratios (1)
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halogens
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bromine
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bromide ion (1)
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chlorine
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chloride ion (1)
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hydrogen
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D/H (2)
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isotope ratios (4)
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isotopes
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stable isotopes
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B-11/B-10 (1)
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C-13/C-12 (3)
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D/H (2)
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O-18/O-16 (4)
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metals
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alkali metals
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potassium (2)
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sodium (1)
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alkaline earth metals
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calcium (1)
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magnesium (1)
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iron
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ferric iron (1)
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platinum group
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palladium (1)
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platinum (1)
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rare earths
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scandium (1)
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silver (1)
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oxygen
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O-18/O-16 (4)
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geochronology methods
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Ar/Ar (1)
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K/Ar (2)
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Rb/Sr (1)
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U/Pb (2)
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geologic age
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Cenozoic
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Tertiary
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Neogene
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Miocene
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upper Miocene
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Messinian (1)
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Mesozoic
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Cretaceous
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Lower Cretaceous
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Albian (2)
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Upper Cretaceous
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Cenomanian (2)
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Turonian (1)
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Jurassic
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Upper Jurassic
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Oxfordian (1)
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Triassic
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Bunter (1)
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Paleozoic
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Upper Permian (1)
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Precambrian
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middle Precambrian (1)
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upper Precambrian
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Proterozoic
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Neoproterozoic
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igneous rocks
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igneous rocks
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plutonic rocks
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granites (2)
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ultramafics
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peridotites (1)
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volcanic rocks
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pyroclastics
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tuff (1)
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ophiolite (1)
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metamorphic rocks
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ophiolite (1)
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minerals
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alloys (1)
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arsenides
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carbonates
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oxides
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chromite (1)
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hydroxides
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oxyhydroxides (1)
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pitchblende (1)
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rutile (1)
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platinum minerals (1)
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silicates
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framework silicates
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silica minerals
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quartz (4)
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orthosilicates
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nesosilicates
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zircon group
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coffinite (1)
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ring silicates
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tourmaline group
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dravite (1)
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sheet silicates
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chlorite group
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chlorite (4)
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clay minerals
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kaolinite (1)
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saponite (2)
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smectite (8)
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vermiculite (2)
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illite (4)
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mica group
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glauconite (1)
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serpentine group
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berthierine (1)
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serpentine (2)
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sulfides
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arsenopyrite (1)
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tungstates
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wolframite (2)
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Primary terms
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absolute age (4)
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Africa
-
Central Africa
-
Gabon (1)
-
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North Africa
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Algeria
-
Ahaggar (1)
-
-
Atlas Mountains
-
Moroccan Atlas Mountains
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Anti-Atlas (3)
-
-
-
Morocco
-
Moroccan Atlas Mountains
-
Anti-Atlas (3)
-
-
-
-
West Africa
-
Niger (1)
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-
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barite deposits (1)
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boron
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B-11/B-10 (1)
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brines (5)
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Canada
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Western Canada
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Athabasca Basin (2)
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Saskatchewan (1)
-
-
-
carbon
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C-13/C-12 (3)
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Cenozoic
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Tertiary
-
Neogene
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Miocene
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upper Miocene
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Messinian (1)
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-
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chemical analysis (1)
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clay mineralogy (5)
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crust (1)
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crystal chemistry (4)
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data processing (1)
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deformation (2)
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diagenesis (6)
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economic geology (1)
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Europe
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Alps
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French Alps (1)
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Central Europe
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Switzerland (1)
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Upper Rhine Graben (2)
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Pyrenees (1)
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Southern Europe
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Iberian Peninsula
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Iberian Massif (1)
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Portugal (1)
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Spain (1)
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Spanish Central System (1)
-
-
-
Western Europe
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France
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Bas-Rhin France
-
Soultz-sous-Forets France (1)
-
-
Central Massif
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Montagne Noire (1)
-
-
French Alps (1)
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Hautes-Pyrenees France (1)
-
Haut-Rhin France (1)
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Lozere France (1)
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Paris Basin (1)
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North Pyrenean Fault (1)
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faults (3)
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fluorspar deposits (1)
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fractures (2)
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geochemistry (8)
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ground water (1)
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heat flow (1)
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hydrogen
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D/H (2)
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igneous rocks
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plutonic rocks
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granites (2)
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ultramafics
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peridotites (1)
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-
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volcanic rocks
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pyroclastics
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tuff (1)
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-
-
-
inclusions
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fluid inclusions (12)
-
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intrusions (1)
-
isotopes
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stable isotopes
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B-11/B-10 (1)
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C-13/C-12 (3)
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D/H (2)
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O-18/O-16 (4)
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mantle (1)
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Mesozoic
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Cretaceous
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Lower Cretaceous
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Albian (2)
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Upper Cretaceous
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Cenomanian (2)
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Turonian (1)
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-
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Jurassic
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Upper Jurassic
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Oxfordian (1)
-
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Triassic
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Lower Triassic
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Bunter (1)
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-
-
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metal ores
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gold ores (2)
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lead ores (1)
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lead-zinc deposits (1)
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mercury ores (1)
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nickel ores (2)
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silver ores (3)
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tungsten ores (2)
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uranium ores (5)
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zinc ores (1)
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metals
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alkali metals
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potassium (2)
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sodium (1)
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alkaline earth metals
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calcium (1)
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magnesium (1)
-
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iron
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ferric iron (1)
-
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platinum group
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palladium (1)
-
platinum (1)
-
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rare earths
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scandium (1)
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silver (1)
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metamorphic rocks
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metasedimentary rocks (1)
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metamorphism (2)
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metasomatism (7)
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mineral deposits, genesis (10)
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Oceania
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Melanesia
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New Caledonia (3)
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orogeny (1)
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oxygen
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O-18/O-16 (4)
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Paleozoic
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Permian
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Upper Permian (1)
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paragenesis (5)
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phase equilibria (1)
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plate tectonics (2)
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Precambrian
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middle Precambrian (1)
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upper Precambrian
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Proterozoic
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Neoproterozoic
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Cryogenian (1)
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sedimentary rocks
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carbonate rocks
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chemically precipitated rocks
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conglomerate (1)
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graywacke (1)
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siltstone (1)
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sedimentary structures
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graded bedding (1)
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soft sediment deformation
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clastic dikes (1)
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sediments
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clastic sediments
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clay (1)
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soils
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laterites (2)
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talc deposits (1)
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tectonics (1)
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waste disposal (1)
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weathering (1)
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X-ray analysis (1)
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sedimentary rocks
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sedimentary rocks
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carbonate rocks
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grainstone (1)
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limestone (1)
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chemically precipitated rocks
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evaporites (2)
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clastic rocks
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bentonite (2)
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black shale (1)
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claystone (1)
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conglomerate (1)
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graywacke (1)
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sandstone (4)
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siltstone (1)
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volcaniclastics (1)
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sedimentary structures
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sedimentary structures
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graded bedding (1)
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soft sediment deformation
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clastic dikes (1)
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sediments
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sediments
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clastic sediments
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clay (1)
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volcaniclastics (1)
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soils
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soils
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laterites (2)
-
-
Abstract The Couriège prospect (French Guiana) provides key examples of the diversity of gold distribution related to supergene processes. The nature of gold in two contrasted weathering profiles is examined as a function of the weathering lithofacies. The autochthonous profile hosts weathered Au-bearing quartz veins whereas the pediment profile is enriched in free gold issued from dismantled gold-bearing quartz veins. The gold distribution is controlled by: (1) the preservation of primary gold as free gold in both transported and autochthonous horizons and as electrum inclusions in detrital pyrite; and (2) the formation of secondary gold through dissolution/precipitation processes, expressed as gold spherulites on the free gold grain surface, an Ag-depleted rim around transported free gold grains and Ag-depleted gold micro-inclusions hosted by oxidized autochthonous pyrite. Gold enrichment through supergene chemical processes remains limited within the truncated autochthonous profile. A new conceptual model is proposed for the area, defining the role of chemical and physical processes in gold endowment and accounting for the geomorphological context. The overall evolution includes (1) deep weathering and peneplenation, (2) dismantlement and transport of lateritic material and (3) the development of a latosol cover. This study highlights that gold exploration in tropical environments must consider the residual v. transported nature and the inheritance of targeted pedogenic horizons.