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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Paleoproterozoic (4)
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sheet silicates
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illite (4)
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tellurides
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Primary terms
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absolute age (36)
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Asia
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Kyzylkum (1)
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Far East
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Korea
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South Korea
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Irkutsk Russian Federation (1)
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Kamchatka Russian Federation
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Kemerovo Russian Federation (1)
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Middle East
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Cyprus (1)
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Iran (1)
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Turkey (1)
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Siberian Platform
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Yenisei Ridge (1)
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Transbaikalia (1)
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Uzbekistan
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Muruntau Deposit (1)
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-
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atmosphere (1)
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Australasia
-
Australia
-
Lachlan fold belt (1)
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New South Wales Australia
-
Northparkes Mine (1)
-
-
Northern Territory Australia
-
Pine Creek Geosyncline (1)
-
-
Queensland Australia
-
Rockhampton Australia (1)
-
-
South Australia
-
Gawler Craton (2)
-
-
Western Australia
-
Kambalda Australia (1)
-
Pilbara Craton (1)
-
Yilgarn Craton (2)
-
-
-
New Zealand
-
Coromandel Peninsula (3)
-
-
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barite deposits (1)
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boron (1)
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brines (1)
-
Canada
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Cassiar Mountains (1)
-
Eastern Canada
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Ontario
-
Larder Lake District Ontario (1)
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Timiskaming District Ontario
-
Kirkland Lake Ontario (1)
-
-
-
Quebec (1)
-
-
Western Canada
-
British Columbia (2)
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Canadian Cordillera (1)
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Manitoba (1)
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Yukon Territory (1)
-
-
-
carbon
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C-13/C-12 (3)
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organic carbon (2)
-
-
Caribbean region
-
West Indies
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Antilles
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Greater Antilles
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Cuba (1)
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-
-
-
-
Cenozoic
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Tertiary
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lower Tertiary (1)
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Neogene
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Miocene
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middle Miocene (1)
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-
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Paleogene
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Eocene
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upper Eocene (1)
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Oligocene (2)
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Paleocene (2)
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chemical analysis (2)
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clay mineralogy (8)
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crust (1)
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crystal chemistry (4)
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crystal growth (3)
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crystal structure (2)
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economic geology (16)
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Europe
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Caucasus
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Spain
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Western Europe
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France
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faults (10)
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geochemistry (9)
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geophysical methods (4)
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hydrogen
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hydrogeology (1)
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igneous rocks
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trachytes (1)
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inclusions
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fluid inclusions (15)
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sericite
Geology and Structural Evolution of the La Huifa Ore Deposit, Central Chile: A Newly Discovered Porphyry Cu-Mo System in the El Teniente District
Supergene Turquoise and Associated Phosphate Minerals of the Porphyry-Lode System at Butte, Montana, USA
Geology and Geochronology of the Miocene Rio Blanco Porphyry Cu-Mo Deposit, Northern Peru
Geochemistry and Provenances of the Paleoproterozoic Terrigenous Rocks of the Urik–Iya Graben (Southern Siberian Craton)
Kinematics and Geochronology of Late Paleozoic–Early Mesozoic Ductile Deformation in the Alxa Block, NW China: New Constraints on the Evolution of the Central Asian Orogenic Belt
Oxygen isotope evidence for input of magmatic fluids and precipitation of Au-Ag-tellurides in an otherwise ordinary adularia-sericite epithermal system in NE China
Geologic Structure, Mineralogy, and Geochemistry of the Nerunda Gold Ore Field (Northern Transbaikalia)
Preparation and characterization of quaternary ammonium salt and 3-aminopropyltriethoxysilane-modified sericite mica
IN SITU DATING OF HYDROTHERMAL MONAZITE AND IMPLICATIONS FOR THE GEODYNAMIC CONTROLS ON ORE FORMATION IN THE JIAODONG GOLD PROVINCE, EASTERN CHINA
The Tongkuangyu Cu Deposit, Trans-North China Orogen: A Metamorphosed Paleoproterozoic Porphyry Cu Deposit
Zircon Petrochronology of the Meghri-Ordubad Pluton, Lesser Caucasus: Fingerprinting Igneous Processes and Implications for the Exploration of Porphyry Cu-Mo Deposits
Evaluating the Use of the Molybdenite Re-Os Chronometer in Dating Gold Mineralization: Evidence from the Haigou Deposit, Northeastern China
LA-ICP-MS zircon U–Pb and sericite 40 Ar/ 39 Ar ages of the Songjianghe gold deposit in southeastern Jilin Province, Northeast China, and their geological significance
Geophysical properties of an epithermal Au-Ag deposit in British Columbia, Canada
Geology, geochemistry, and geochronology of the Laozuoshan gold deposit, Heilongjiang Province, Northeast China: implications for multiple gold mineralization events and geodynamic setting
Abstract The spatial distributions of mineralization and alteration in hydrothermal systems are complex and are often considered to be cryptic and problematic to quantify. We used wavelet analysis of conventional hyperspectral drillcore logs to demonstrate quantitatively that primary Au mineralization, common vein-hosted mineralogy (calcite and ankerite), host rock alteration mineralogy (sericite and chlorite) and regional-scale metamorphic assemblages (amphibole) organize spatially as multifractals. This documentation of multifractal spatial organization in Au and alteration mineralogy is sufficient to show that they are the result of underlying deterministic dynamic processes as opposed to random stochastic processes. The application of wavelets to three ore bodies (GQ, Vogue and Cosmo East) from the highly endowed Archaean Sunrise Dam hydrothermal Au system of Western Australia shows that the spatial organizations of Au and ankerite are more closely associated in GQ than in Vogue. The spatial organization of Au in Vogue is more strongly associated with calcite. Primary Au mineralization and infill carbonate mineralogy are more complexly organized than sericitic and chloritic host rock alteration. Although demonstrated here for a hydrothermal system, wavelet analysis is readily applicable to downhole or outcrop data from any deposit type.
U-Pb, Re-Os, AND 40 Ar/ 39 Ar GEOCHRONOLOGY OF PORPHYRY Sn ± Cu ± Mo AND POLYMETALLIC (Ag-Pb-Zn-Cu) VEIN MINERALIZATION AT BIANJIADAYUAN, INNER MONGOLIA, NORTHEAST CHINA: IMPLICATIONS FOR DISCRETE MINERALIZATION EVENTS
Textural, Fluid Inclusion, and Stable Oxygen Isotope Constraints on Vein Formation and Gold Precipitation at the 007 Deposit, Rice Lake Greenstone Belt, Bissett, Manitoba, Canada
Genthelvite Overgrowths On Danalite Cores from a Pegmatite Miarolitic Cavity in Cheyenne Canyon, El Paso County, Colorado
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.