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NARROW
Format
Article Type
Journal
Publisher
Section
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
Central Africa
-
Angola (1)
-
-
Congo Craton (1)
-
East Africa
-
Tanzania (1)
-
Zambia (1)
-
-
Nile Valley (1)
-
North Africa
-
Egypt
-
Aswan Egypt (1)
-
Eastern Desert (2)
-
-
-
Nubian Shield (2)
-
Southern Africa
-
Barberton greenstone belt (1)
-
Kaapvaal Craton (1)
-
Swaziland (1)
-
-
West Africa
-
Burkina Faso (2)
-
Ghana (2)
-
Guinea (1)
-
Ivory Coast (1)
-
Liberia (1)
-
Sierra Leone (1)
-
-
West African Craton (2)
-
-
Asia
-
Arabian Peninsula
-
Arabian Shield (1)
-
-
Far East
-
China
-
Hebei China (1)
-
North China Platform (2)
-
-
Japan
-
Hokkaido
-
Hidaka metamorphic belt (1)
-
Hidaka Mountains (1)
-
-
-
-
Himalayas (1)
-
Indian Peninsula
-
India
-
Andhra Pradesh India
-
Kurnool India (1)
-
-
Dharwar Craton (2)
-
Himachal Pradesh India
-
Kinnaur India (1)
-
-
Karnataka India (1)
-
Maharashtra India (1)
-
-
-
Middle East
-
Turkey
-
Taurus Mountains (1)
-
-
-
Siberia (1)
-
Tajikistan
-
Nurek Tajikistan (1)
-
-
Tibetan Plateau (1)
-
-
Atlantic Ocean
-
North Atlantic
-
Barracuda Ridge (1)
-
Hudson Bay (1)
-
-
-
Australasia
-
Australia
-
New South Wales Australia (1)
-
Northern Territory Australia (1)
-
Western Australia
-
Eastern Goldfields (2)
-
Kalgoorlie Terrane (2)
-
Yilgarn Craton (3)
-
-
-
New Zealand
-
Taupo volcanic zone (1)
-
-
-
Avalon Zone (2)
-
Caledonides (1)
-
Canada
-
Eastern Canada
-
Maritime Provinces
-
New Brunswick (2)
-
Nova Scotia
-
Antigonish County Nova Scotia
-
Antigonish Nova Scotia (1)
-
-
Cape Breton Island (1)
-
-
-
Matachewan dike swarm (1)
-
Meguma Terrane (1)
-
Newfoundland and Labrador
-
Newfoundland
-
Buchans Newfoundland and Labrador (1)
-
-
-
Ontario
-
Algoma District Ontario
-
Wawa Ontario (1)
-
-
Cochrane District Ontario
-
Abitibi Ontario (2)
-
Kidd Creek Mine (3)
-
Timmins Ontario (5)
-
-
Dryden Ontario (1)
-
Larder Lake District Ontario (5)
-
Sudbury District Ontario (2)
-
Sudbury Structure (1)
-
Timiskaming District Ontario
-
Kirkland Lake Ontario (4)
-
-
-
Quebec
-
Abitibi County Quebec
-
Chibougamau Quebec (3)
-
Val d'Or Quebec (11)
-
-
Horne Mine (2)
-
Matagami (1)
-
Noranda Quebec (17)
-
Sigma Mine (2)
-
Temiscamingue County Quebec
-
Rouyn Quebec (11)
-
-
-
-
Hudson Bay (1)
-
Mackenzie Mountains (3)
-
Nunavut (3)
-
Richardson Mountains (1)
-
Selwyn Mountains (1)
-
Western Canada
-
Athabasca Basin (1)
-
British Columbia
-
Guichon Creek Batholith (1)
-
-
Canadian Cordillera (1)
-
Manitoba
-
Thompson nickel belt (1)
-
-
Northwest Territories
-
Yellowknife Northwest Territories (1)
-
-
Saskatchewan (2)
-
Selwyn Basin (1)
-
Yukon Territory
-
Wernecke Mountains (1)
-
-
-
-
Commonwealth of Independent States
-
Russian Federation (1)
-
Tajikistan
-
Nurek Tajikistan (1)
-
-
-
Elba (1)
-
Europe
-
Karelia (1)
-
Southern Europe
-
Greece (1)
-
Italy
-
Tuscany Italy
-
Monte Capanne (1)
-
-
-
-
Western Europe
-
France
-
Aquitaine (1)
-
Aquitaine Basin (1)
-
Aude France
-
Salsigne Mine (1)
-
-
Central Massif
-
Montagne Noire (1)
-
-
-
Scandinavia
-
Finland (1)
-
Norway (1)
-
-
-
-
Franklin Mountains (1)
-
Mackenzie River valley (1)
-
Mexico (1)
-
North America
-
Appalachians
-
Northern Appalachians (2)
-
-
Canadian Shield
-
Churchill Province (3)
-
Grenville Province (1)
-
Slave Province (3)
-
Superior Province
-
Abitibi Belt (73)
-
Michipicoten Belt (1)
-
Pontiac Subprovince (6)
-
Swayze greenstone belt (4)
-
Wabigoon Belt (3)
-
Wawa Belt (2)
-
-
-
Lake of the Woods region (1)
-
North American Cordillera
-
Canadian Cordillera (1)
-
-
Ogilvie Mountains (1)
-
Rocky Mountains
-
Southern Rocky Mountains (1)
-
U. S. Rocky Mountains
-
San Juan Mountains (1)
-
Sangre de Cristo Mountains (1)
-
Sawatch Range (1)
-
-
-
Western Canada Sedimentary Basin (2)
-
-
North Island (1)
-
Sierra Nevada (1)
-
South America
-
Guiana Shield (1)
-
-
South Mountain Batholith (1)
-
United States
-
Arizona (1)
-
California
-
Mono County California (1)
-
Sierra Nevada Batholith (1)
-
-
Colorado
-
San Juan volcanic field (1)
-
Sawatch Range (1)
-
-
Colorado Plateau (1)
-
Connecticut (1)
-
Maine
-
Franklin County Maine (1)
-
Hancock County Maine (2)
-
Penobscot Bay (2)
-
Waldo County Maine (1)
-
Washington County Maine (1)
-
-
Massachusetts
-
Essex County Massachusetts (1)
-
-
Narragansett Basin (1)
-
Nevada
-
Carlin Trend (1)
-
Elko County Nevada (1)
-
-
New England (3)
-
New Mexico
-
Taos County New Mexico
-
Questa Caldera (1)
-
-
Taos Plateau (1)
-
-
Rhode Island (1)
-
U. S. Rocky Mountains
-
San Juan Mountains (1)
-
Sangre de Cristo Mountains (1)
-
Sawatch Range (1)
-
-
Washington
-
Whatcom County Washington (1)
-
-
Western U.S. (1)
-
Wyoming (1)
-
-
-
commodities
-
barite deposits (1)
-
brines (2)
-
metal ores
-
arsenic ores (1)
-
base metals (7)
-
bismuth ores (1)
-
copper ores (25)
-
gold ores (93)
-
lead ores (10)
-
lead-zinc deposits (6)
-
mercury ores (1)
-
molybdenum ores (4)
-
nickel ores (5)
-
platinum ores (3)
-
polymetallic ores (5)
-
silver ores (14)
-
uranium ores (1)
-
zinc ores (15)
-
-
mineral deposits, genesis (62)
-
mineral exploration (41)
-
mineral resources (1)
-
petroleum
-
natural gas (2)
-
-
placers (1)
-
-
elements, isotopes
-
carbon
-
C-13/C-12 (5)
-
-
chemical ratios (1)
-
halogens
-
fluorine (1)
-
-
hydrogen
-
D/H (7)
-
-
isotope ratios (30)
-
isotopes
-
radioactive isotopes
-
Pb-206/Pb-204 (4)
-
Pb-207/Pb-204 (4)
-
Pb-208/Pb-204 (4)
-
Pb-210 (1)
-
Sm-147/Nd-144 (1)
-
-
stable isotopes
-
C-13/C-12 (5)
-
D/H (7)
-
Hf-177/Hf-176 (2)
-
Nd-144/Nd-143 (7)
-
O-18 (1)
-
O-18/O-16 (18)
-
Pb-206/Pb-204 (4)
-
Pb-207/Pb-204 (4)
-
Pb-207/Pb-206 (3)
-
Pb-208/Pb-204 (4)
-
Pb-208/Pb-206 (1)
-
S-33/S-32 (2)
-
S-34/S-32 (9)
-
Sm-147/Nd-144 (1)
-
Sr-87/Sr-86 (8)
-
-
-
metals
-
alkali metals
-
potassium (1)
-
-
alkaline earth metals
-
strontium
-
Sr-87/Sr-86 (8)
-
-
-
antimony (2)
-
arsenic (1)
-
cadmium (1)
-
copper (1)
-
gold (4)
-
hafnium
-
Hf-177/Hf-176 (2)
-
-
indium (1)
-
lead
-
Pb-206/Pb-204 (4)
-
Pb-207/Pb-204 (4)
-
Pb-207/Pb-206 (3)
-
Pb-208/Pb-204 (4)
-
Pb-208/Pb-206 (1)
-
Pb-210 (1)
-
-
platinum group
-
platinum ores (3)
-
-
precious metals (1)
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (7)
-
Sm-147/Nd-144 (1)
-
-
samarium
-
Sm-147/Nd-144 (1)
-
-
-
silver (1)
-
tin (1)
-
zinc (1)
-
-
nitrogen (1)
-
oxygen
-
O-18 (1)
-
O-18/O-16 (18)
-
-
sulfur
-
S-33/S-32 (2)
-
S-34/S-32 (9)
-
-
-
fossils
-
Invertebrata
-
Mollusca
-
Bivalvia
-
Ostreoidea
-
Ostreidae (1)
-
-
-
-
-
-
geochronology methods
-
Ar/Ar (2)
-
K/Ar (1)
-
paleomagnetism (4)
-
Pb/Pb (3)
-
Rb/Sr (2)
-
Re/Os (9)
-
Sm/Nd (2)
-
thermochronology (1)
-
U/Pb (33)
-
U/Th/Pb (1)
-
-
geologic age
-
Cenozoic
-
Quaternary
-
Holocene (1)
-
-
Tertiary
-
Neogene
-
Miocene (2)
-
-
Paleogene
-
Eocene (1)
-
-
-
-
Mesozoic
-
Cretaceous
-
Upper Cretaceous
-
Tuolumne Intrusive Suite (1)
-
-
-
Jurassic (1)
-
upper Mesozoic (1)
-
-
Paleozoic
-
Cambrian
-
Middle Cambrian (1)
-
-
Devonian
-
Fisset Brook Formation (1)
-
Lower Devonian (2)
-
Middle Devonian
-
Nahanni Formation (1)
-
Sulphur Point Formation (1)
-
-
Slave Point Formation (1)
-
Upper Devonian (1)
-
-
Ordovician
-
Meguma Group (1)
-
Middle Ordovician
-
Black River Group (1)
-
-
-
Permian
-
Lower Permian (1)
-
-
Silurian
-
Upper Silurian (3)
-
-
-
Phanerozoic (3)
-
Precambrian
-
Archean
-
Blake River Group (15)
-
Gilman Formation (1)
-
Mesoarchean (1)
-
Neoarchean (17)
-
Opemisca Group (1)
-
Roy Group (1)
-
Timiskaming Group (6)
-
Yellowknife Group (1)
-
-
Kisseynew Complex (1)
-
upper Precambrian
-
Proterozoic
-
Neoproterozoic (2)
-
Paleoproterozoic
-
Birimian (1)
-
-
-
-
-
-
igneous rocks
-
igneous rocks
-
kimberlite (1)
-
plutonic rocks
-
anorthosite (1)
-
diorites
-
quartz diorites (1)
-
tonalite (7)
-
trondhjemite (5)
-
-
gabbros
-
troctolite (1)
-
-
granites
-
aplite (1)
-
leucogranite (2)
-
monzogranite (2)
-
-
granodiorites (8)
-
lamprophyres (1)
-
monzodiorite (2)
-
monzonites (1)
-
pegmatite (1)
-
syenites
-
quartz syenite (1)
-
-
syenodiorite (1)
-
ultramafics (4)
-
-
porphyry (2)
-
volcanic rocks
-
andesites (3)
-
basalts
-
mid-ocean ridge basalts (2)
-
tholeiite (1)
-
tholeiitic basalt (2)
-
-
dacites (1)
-
komatiite (6)
-
pyroclastics
-
hyaloclastite (1)
-
ignimbrite (2)
-
tuff (4)
-
-
rhyolites (5)
-
trachytes (1)
-
-
-
ophiolite (2)
-
-
metamorphic rocks
-
metamorphic rocks
-
amphibolites (2)
-
gneisses (6)
-
granulites (3)
-
marbles (1)
-
metaigneous rocks
-
metabasalt (1)
-
metagabbro (1)
-
metagranite (1)
-
metakomatiite (1)
-
-
metaplutonic rocks (2)
-
metasedimentary rocks
-
metaconglomerate (1)
-
-
metasomatic rocks
-
rodingite (1)
-
-
metavolcanic rocks (7)
-
migmatites (1)
-
mylonites (1)
-
schists
-
greenschist (2)
-
-
-
ophiolite (2)
-
turbidite (2)
-
-
minerals
-
alloys
-
electrum (1)
-
-
antimonides
-
dyscrasite (1)
-
-
arsenides
-
arsenopyrite (2)
-
-
carbonates (1)
-
native elements (1)
-
oxides
-
corundum (1)
-
ilmenite (1)
-
magnetite (1)
-
rutile (2)
-
sapphire (1)
-
spinel (1)
-
-
phosphates
-
apatite (3)
-
monazite (1)
-
xenotime (1)
-
-
silicates
-
chain silicates
-
amphibole group
-
clinoamphibole
-
hornblende (1)
-
-
-
-
framework silicates
-
feldspar group
-
alkali feldspar
-
K-feldspar (3)
-
perthite (1)
-
-
plagioclase (2)
-
-
silica minerals
-
quartz (5)
-
-
-
orthosilicates
-
nesosilicates
-
garnet group (3)
-
kyanite (1)
-
olivine group
-
olivine (1)
-
-
sillimanite (1)
-
titanite group
-
titanite (1)
-
-
zircon group
-
zircon (16)
-
-
-
-
ring silicates
-
tourmaline group (2)
-
-
sheet silicates
-
chlorite group
-
chlorite (3)
-
-
mica group
-
biotite (2)
-
fuchsite (1)
-
muscovite (4)
-
-
sericite (1)
-
serpentine group
-
serpentine (1)
-
-
talc (1)
-
-
-
sulfates
-
barite (1)
-
-
sulfides
-
acanthite (1)
-
arsenopyrite (2)
-
chalcopyrite (2)
-
galena (3)
-
gudmundite (1)
-
molybdenite (5)
-
pyrite (7)
-
pyrrhotite (4)
-
sphalerite (3)
-
-
sulfosalts
-
sulfantimonites
-
tetrahedrite (1)
-
-
-
-
Primary terms
-
absolute age (39)
-
Africa
-
Central Africa
-
Angola (1)
-
-
Congo Craton (1)
-
East Africa
-
Tanzania (1)
-
Zambia (1)
-
-
Nile Valley (1)
-
North Africa
-
Egypt
-
Aswan Egypt (1)
-
Eastern Desert (2)
-
-
-
Nubian Shield (2)
-
Southern Africa
-
Barberton greenstone belt (1)
-
Kaapvaal Craton (1)
-
Swaziland (1)
-
-
West Africa
-
Burkina Faso (2)
-
Ghana (2)
-
Guinea (1)
-
Ivory Coast (1)
-
Liberia (1)
-
Sierra Leone (1)
-
-
West African Craton (2)
-
-
Asia
-
Arabian Peninsula
-
Arabian Shield (1)
-
-
Far East
-
China
-
Hebei China (1)
-
North China Platform (2)
-
-
Japan
-
Hokkaido
-
Hidaka metamorphic belt (1)
-
Hidaka Mountains (1)
-
-
-
-
Himalayas (1)
-
Indian Peninsula
-
India
-
Andhra Pradesh India
-
Kurnool India (1)
-
-
Dharwar Craton (2)
-
Himachal Pradesh India
-
Kinnaur India (1)
-
-
Karnataka India (1)
-
Maharashtra India (1)
-
-
-
Middle East
-
Turkey
-
Taurus Mountains (1)
-
-
-
Siberia (1)
-
Tajikistan
-
Nurek Tajikistan (1)
-
-
Tibetan Plateau (1)
-
-
Atlantic Ocean
-
North Atlantic
-
Barracuda Ridge (1)
-
Hudson Bay (1)
-
-
-
Australasia
-
Australia
-
New South Wales Australia (1)
-
Northern Territory Australia (1)
-
Western Australia
-
Eastern Goldfields (2)
-
Kalgoorlie Terrane (2)
-
Yilgarn Craton (3)
-
-
-
New Zealand
-
Taupo volcanic zone (1)
-
-
-
barite deposits (1)
-
bibliography (1)
-
brines (2)
-
Canada
-
Eastern Canada
-
Maritime Provinces
-
New Brunswick (2)
-
Nova Scotia
-
Antigonish County Nova Scotia
-
Antigonish Nova Scotia (1)
-
-
Cape Breton Island (1)
-
-
-
Matachewan dike swarm (1)
-
Meguma Terrane (1)
-
Newfoundland and Labrador
-
Newfoundland
-
Buchans Newfoundland and Labrador (1)
-
-
-
Ontario
-
Algoma District Ontario
-
Wawa Ontario (1)
-
-
Cochrane District Ontario
-
Abitibi Ontario (2)
-
Kidd Creek Mine (3)
-
Timmins Ontario (5)
-
-
Dryden Ontario (1)
-
Larder Lake District Ontario (5)
-
Sudbury District Ontario (2)
-
Sudbury Structure (1)
-
Timiskaming District Ontario
-
Kirkland Lake Ontario (4)
-
-
-
Quebec
-
Abitibi County Quebec
-
Chibougamau Quebec (3)
-
Val d'Or Quebec (11)
-
-
Horne Mine (2)
-
Matagami (1)
-
Noranda Quebec (17)
-
Sigma Mine (2)
-
Temiscamingue County Quebec
-
Rouyn Quebec (11)
-
-
-
-
Hudson Bay (1)
-
Mackenzie Mountains (3)
-
Nunavut (3)
-
Richardson Mountains (1)
-
Selwyn Mountains (1)
-
Western Canada
-
Athabasca Basin (1)
-
British Columbia
-
Guichon Creek Batholith (1)
-
-
Canadian Cordillera (1)
-
Manitoba
-
Thompson nickel belt (1)
-
-
Northwest Territories
-
Yellowknife Northwest Territories (1)
-
-
Saskatchewan (2)
-
Selwyn Basin (1)
-
Yukon Territory
-
Wernecke Mountains (1)
-
-
-
-
carbon
-
C-13/C-12 (5)
-
-
Cenozoic
-
Quaternary
-
Holocene (1)
-
-
Tertiary
-
Neogene
-
Miocene (2)
-
-
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Cadillac Group
Structural geology of the Cadillac Group along the Malartic segment of the Larder Lake Cadillac deformation zone, Quebec, and implications for gold mineralization
(A) Geological map of the Cadillac Group. The latter is folded by regional ...
Archean volcanism and sedimentation in the Bousquet gold district, Abitibi greenstone belt, Quebec: Implications for stratigraphy and gold concentration
Abstract The Val d’Or mining district, located in the southern part of the Abitibi belt in the Superior Province, consists of a typical Archean supracrustal volcanosedimentary sequence, obliquely cut by narrow northeast-trending Proterozoi’c diabase dykes. The geology of the Val d’Or area is shown in figure 1. It was initially described by Gunning and Ambrose (1940) and Norman (1946, 1947), and was subsequently revised by Latulippe (1976), Imreh (1984) and more recently by Robert (1989). The northernmost volcanic unit in the Val d’Or area is an extensive ultramafic lava plain known as the Malartic Group. The Lower Malartic is mainly composed of komatiitic ultramafic lava and subordinate basaltic flows. The Upper Malartic, comprised of basaltic lava with horizons of ultramafic and felsic volcaniclastic rocks (lmreh, 1984), is dominated by two main schistosities, S 1 and S 2 S 1 , oriented northwest, is related to the principal flattening plane. S1 is reoriented by an east-west fabric (S2) which is related to asymmetrical Z-folds found over most of the Val d’Or area. The Kiena Mine, one of the mines we will visit during the second day of our tour, is hosted by the Upper Malartic Group. The Kewagama Group, located to the south of the Malartic Group, contains beds of metawacke and metapelite which have undergone two distinct folding events.axial planes related to the first folding event, oriented northwest, have been reoriented during a second phase of deformation that generated folds whose axial traces are oriented at 278 ° (Tourigny, 1984). The Blake River Group, dominating the Rouyn-Noranda district 100 km to the west of Val d’Or, pinches out between the metasedimentary Kewagama and Cadillac groups near the town of Malartic. Here, the Blake River Group is composed of brecciated basaltic lavas with a main schistosity oriented at 275 ° . The Cadillac Group, occurring to the south of the Blake River and Kewagama groups, is composed of metawacke and metapelite. Axial plane traces oriented at 284 ° terminate against the contact of the Blake River Group. The Piché Group is found only within the Cadillac tectonic zone in the Val d’Or area. It consists mainly of ultramafic lava. Where the deformation is intense, the lava is completely transformed to talc-carbonate schist. Where the deformation is less intense, spinifex textures are still visible. The Cadillac tectonic zone, generally oriented east-west, has been traced from Vauquelin township (east of Val d’Or) west to the border of Ontario and beyond.
Detailed map of the QFP intrusion along the contact between the Piché and C...
The Bousquet 2-Dumagami World-Class Archean Au-Rich Volcanogenic Massive Sulfide Deposit, Abitibi, Quebec: Metamorphosed Submarine Advanced Argillic Alteration Footprint and Genesis
The LaRonde Penna World-Class Au-Rich Volcanogenic Massive Sulfide Deposit, Abitibi, Québec: Mineralogy and Geochemistry of Alteration and Implications for Genesis and Exploration
Geological maps of stripped outcrops on opposite limbs of a regional F 2 f...
Stereonet plots of lineations and fold axes, and poles to veins, foliations...
Simplified schematic geologic map of level 84-00 (840 m below surface) show...
Field photographs of lithological units. (A) Turbiditic wacke of the Cadill...
Geology of the Lapa Orogenic Gold Deposit
Abstract The Cadillac mining camp is known for its numerous, but relatively small, orogenic gold deposits, which are spatially associated with the Larder Lake-Cadillac fault zone. The Lapa deposit, with a total endowment of 36 t Au (1.15 Moz), represents the largest gold deposit of the Cadillac mining camp. The Lapa deposit main ore zones are mostly hosted in the Piché Group ultramafic to intermediate volcanic units that are strongly transposed and separated by subvertical, anastomosed high-strain corridors that are part of the Larder Lake-Cadillac fault zone. There are 12 ore zones that are stacked from north to south, forming a series of subparallel, E-striking (main foliation-parallel), steeply dipping south to subvertical “lenses.” The ore consists mainly of very fine-grained (≤1 mm), disseminated sulfides (arsenopyrite and pyrrhotite with traces of chalcopyrite, pyrite, and sphalerite), sulfosalts, native Au, and native Sb. Three amphibolite-grade metamorphosed proximal alteration assemblages are present at Lapa, namely bio-tite-bearing, sericite-bearing, and actinolite-bearing assemblages. The distribution of the three assemblages, defined by the most abundant mineral, is at least in part controlled by the primary host-rock composition. The proximal alteration facies give way to chlorite- (upper half of the deposit at <1,000 m) and hornblende-bearing (lower half of the deposit at >1,000 m) assemblages a few meters to a few decimeters away from the ore zones. The isograd defined by the presence of actinolite in the proximal alteration assemblage and hornblende in the distal assemblage below 1,000 m correlates with a shift from an Au-As association in the lowermost levels of the mine to an Au-Sb association at depth. This variation is thought to be due to varying heat and fluid flow regimes at different times and crustal levels in the fault, with the upgrading of early, “low-grade” Au during prograde and retrograde metamorphism. The Cadillac camp, including the Lapa deposit, is an excellent example of the camp to deposit to stope controls exerted by the structural and lithologic setting on the nature, style, and geometry of greenstone-hosted orogenic gold deposits.
Summary of rock assemblages near the Piché Structural Complex (PSC) and rel...
A. U-Pb concordia diagram for zircons from unit 5.2b (subunit 5.2b-R, rhyol...
A. Section view of the 20N Au zone, showing strong transposition of the pyr...
A. Unit 5.3 feldspar- and quartz-phyric rhyolite characterized by blue-gray...
Field photographs of D 2 and D 3 structures. (A) Parasitic F 2 folds in ...
Abstract The Malartic gold camp is located in the southern part of the Archean Superior Province and straddles the Larder Lake-Cadillac fault zone that is between the Abitibi and Pontiac subprovinces. It comprises the world-class Canadian Malartic deposit (25.91 Moz, including past production, reserves, and resources), and smaller gold deposits located along faults and shear zones in volcanic and metasedimentary rocks of the Abitibi subprovince. North of the Larder Lake-Cadillac fault zone, the Malartic camp includes 2714 to 2697 Ma volcanic rocks and ≤2687 Ma turbiditic sedimentary rocks overlain by ≤2679 to 2669 Ma polymictic conglomerate and sandstone of the Timiskaming Group. South of the fault, the Pontiac subprovince comprises ≤2685 Ma turbiditic graywacke and mudstone, and minor ultramafic to mafic volcanic rocks and iron formations of the Pontiac Group. These supracrustal rocks were metamorphosed at peak greenschist to lower amphibolite facies conditions at ~2660 to 2658 Ma, during D 2 compressive deformation, and are cut by a variety of postvolcanic intrusions ranging from ~2695 to 2640 Ma. The Canadian Malartic deposit encompasses several past underground operations and is currently mined as a low-grade, open-pit operation that accounts for about 80% of the past production and reserves in the camp. It dominantly consists of disseminated-stockwork replacement-style mineralization in greenschist facies sedimentary rocks of the Pontiac Group. The mineralized zones are spatially associated with the Sladen fault and ~2678 Ma subalkaline to alkaline porphyritic quartz monzodiorite and granodiorite. Field relationships and isotopic age data for ore-related vein minerals indicate that gold mineralization in the Canadian Malartic deposit occurred at ~2665 to 2660 Ma and was contemporaneous with syn- to late-D 2 peak metamorphism. The smaller deposits in the camp include auriferous disseminated-stockwork zones of the Camflo deposit (1.9 Moz) and quartz ± carbonate-pyrite veins and breccias (0.6 Moz) along faults in chemically and mechanically favorable rocks. The age of these deposits is poorly constrained, but ~2692 Ma postmineral dikes, and ~2625 Ma hydrothermal titanite and rutile from the Camflo deposit highlight a long and complex hydrothermal history. Crosscutting relationships and regional geochronological constraints suggest that an early episode of pre-Timiskaming mineralization occurred at >2692 Ma, shortly after the end of volcanism in the Malartic camp, and postmetamorphic fluid circulation may have contributed to concentration or remobilization of gold until ~2625 Ma. However, the bulk of the gold was concentrated in the Canadian Malartic deposit during the main phase of compressive deformation and peak regional metamorphism.