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NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
Southern Africa
-
South Africa
-
Bushveld Complex (3)
-
Transvaal region (1)
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-
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Arctic Ocean
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Norwegian Sea
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More Basin (1)
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Voring Basin (1)
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Voring Plateau (1)
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Asia
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Far East
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Borneo
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Malaysia
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Thailand (1)
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Transbaikalia (2)
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Atlantic Ocean
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Australasia
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Australia
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Canada
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Western Canada
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Cascade Range (1)
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Commonwealth of Independent States
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Russian Federation
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Elba (5)
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Europe
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France
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Indian Ocean
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Mexico
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Oceania
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ODP Site 642 (1)
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North Pacific
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elements, isotopes
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chemical ratios (1)
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hydrogen
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isotope ratios (6)
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isotopes
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radioactive isotopes
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Pb-206/Pb-204 (1)
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Pb-208/Pb-204 (1)
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stable isotopes
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copper (1)
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lead
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oxygen
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fossils
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Invertebrata
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geochronology methods
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upper Cenozoic
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Mesozoic
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Paleozoic
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Precambrian
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Transvaal Supergroup (1)
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upper Precambrian
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Paleoproterozoic
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Aphebian (2)
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Rooiberg Group (1)
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Rhenohercynian (1)
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igneous rocks
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igneous rocks
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granophyre (2)
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plutonic rocks
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pyroxene group
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framework silicates
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K-feldspar (2)
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orthosilicates
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ring silicates
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sheet silicates
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clay minerals
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palygorskite (1)
-
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sulfides
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molybdenite (1)
-
-
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Primary terms
-
absolute age (18)
-
Africa
-
Southern Africa
-
South Africa
-
Bushveld Complex (3)
-
Transvaal region (1)
-
-
-
-
Arctic Ocean
-
Norwegian Sea
-
More Basin (1)
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Voring Basin (1)
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Voring Plateau (1)
-
-
-
Asia
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Baikal rift zone (1)
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Far East
-
Borneo
-
East Malaysia
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Sabah Malaysia (1)
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-
-
Malaysia
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East Malaysia
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Sabah Malaysia (1)
-
-
-
Thailand (1)
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-
Irkutsk Russian Federation (1)
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Transbaikalia (2)
-
-
Atlantic Ocean
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North Atlantic
-
Faeroe-Shetland Basin (4)
-
Rockall Trough (1)
-
-
-
Australasia
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Australia
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Victoria Australia (1)
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-
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barite deposits (1)
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bibliography (1)
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Canada
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Eastern Canada
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Maritime Provinces
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Nova Scotia (1)
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Meguma Terrane (1)
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Quebec
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Monteregian Hills (1)
-
-
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Western Canada
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Canadian Cordillera (1)
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Northwest Territories
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Great Slave Lake (2)
-
-
-
-
carbon
-
C-13/C-12 (1)
-
-
Caribbean region
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West Indies
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Antilles
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Greater Antilles
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Jamaica (1)
-
-
-
-
-
Cenozoic
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Quaternary
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Pleistocene (1)
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Tertiary
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lower Tertiary (1)
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middle Tertiary (1)
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Neogene
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Miocene
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lower Miocene (1)
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upper Miocene (2)
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-
-
Paleogene
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Oligocene
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middle Oligocene (1)
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upper Oligocene (2)
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Paleocene
-
lower Paleocene (1)
-
-
-
-
upper Cenozoic
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Newer Volcanics (1)
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-
-
chemical analysis (5)
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construction materials
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crust (10)
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crystal structure (1)
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data processing (2)
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deformation (9)
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East Pacific Ocean Islands
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economic geology (4)
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energy sources (1)
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Europe
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Alps
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Eastern Alps
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Dinaric Alps (1)
-
-
Western Alps (1)
-
-
Central Europe
-
Switzerland
-
Valais Switzerland (1)
-
-
-
Fennoscandian Shield (1)
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Pannonian Basin (1)
-
Pyrenees
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French Pyrenees (2)
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Spanish Pyrenees (2)
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-
Southern Europe
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Dinaric Alps (1)
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Iberian Peninsula
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Spain
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Andalusia Spain
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Jaen Spain (1)
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Basque Provinces Spain (1)
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Betic Cordillera (1)
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Cantabrian Basin (2)
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Spanish Pyrenees (2)
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Italy
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Serbia (1)
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Variscides (2)
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Western Europe
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France
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Central Massif
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hydrogen
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granites
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S-type granites (1)
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Ultrapotassic Aluminosilicate Melts: Specifics of Formation by the Example of Synnyrites from the Synnyr Massif
Limited channelized fluid infiltration in the Torres del Paine contact aureole
The spatial distribution of igneous centres along the Norwegian Atlantic Margin (Møre and Vøring) and their relationship to magmatic plumbing systems
Inside the volcano: Three-dimensional magmatic architecture of a buried shield volcano
Windmountainite, □Fe 3+ 2 Mg 2 □ 2 Si 8 O 20 (OH) 2 (H 2 O) 4 ·4H 2 O, a new modulated, layered Fe 3+ -Mg-silicate-hydrate from Wind Mountain, New Mexico: Characterization and origin, with comments on the classification of palygorskite-group minerals
Abstract Cripple Creek is among the largest epithermal districts in the world, with more than 800 metric tons (t) Au (>26.4 Moz). The ores are associated spatially, temporally, and genetically with ~34 to 28 Ma alkaline igneous rocks that were emplaced into an 18-km 2 diatreme complex and surrounding Proterozoic rocks. Gold occurs in high-grade veins, as bulk tonnage relatively low-grade ores, and in hydrothermal breccias. Pervasive alteration in the form of potassic metasomatism is extensive and is intimately associated with gold mineralization. Based on dating of intrusions and molybdenite and gangue minerals (primarily using 40 Ar/ 39 Ar and Re-Os techniques), the region experienced a protracted but intermittent history of magmatism (over a period of at least 5 m.y.) and hydrothermal activity (intermittent over the final ~3 m.y. of magmatic activity). Key factors that likely played a role in the size and grade of the deposit were (1) the generation of alkaline magmas during a transition between subduction and extension that tapped a chemically enriched mantle source; (2) a long history of structural preparation, beginning in the Proterozoic, which created deep-seated structures to allow the magmas and ore fluids to reach shallow levels in the crust, and which produced a fracture network that increased permeability; and (3) an efficient hydrothermal system, including effective gold transport mechanisms, and multiple over-printed hydrothermal events.