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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Bunker Hill Mine (1)
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Europe
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Central Europe
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Poland
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Upper Silesia (1)
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North America
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Red Dog Mine (3)
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United States
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Alaska
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Arkansas
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Montana
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commodities
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brines (2)
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Europe
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Mesozoic
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Upper Cretaceous (2)
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Valdez Group (1)
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metal ores
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antimony ores (1)
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gold ores (1)
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lead ores (5)
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lead-zinc deposits (5)
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zinc ores (6)
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metals
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calcium (1)
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lead
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clastic rocks
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sedimentation (1)
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sulfur
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S-34/S-32 (1)
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United States
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Alaska
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Brooks Range
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De Long Mountains (1)
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Prince William Sound (1)
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Arkansas
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Boone County Arkansas (1)
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Lawrence County Arkansas (1)
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Marion County Arkansas (1)
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Searcy County Arkansas (1)
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Sharp County Arkansas (1)
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Coeur d'Alene mining district (3)
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Idaho
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Kootenai County Idaho (1)
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Shoshone County Idaho (2)
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Idaho Batholith (1)
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Kansas (1)
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Midcontinent (2)
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Montana
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Mineral County Montana (1)
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weathering (1)
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sedimentary rocks
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carbonate rocks
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limestone (2)
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clastic rocks
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conglomerate (1)
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Textural, Compositional, and Sulfur Isotope Variations of Sulfide Minerals in the Red Dog Zn-Pb-Ag Deposits, Brooks Range, Alaska: Implications for Ore Formation
Origin of the Red Dog Zn-Pb-Ag Deposits, Brooks Range, Alaska: Evidence from Regional Pb and Sr Isotope Sources
Re-Os Sulfide Geochronology of the Red Dog Sediment-Hosted Zn-Pb-Ag Deposit, Brooks Range, Alaska
Evidence for Proterozoic and Late Cretaceous-early Tertiary ore-forming events in the Coeur d'Alene District, Idaho and Montana; reply
Evidence for Proterozoic and Late Cretaceous-early Tertiary ore-forming events in the Coeur d'Alene District, Idaho and Montana
Geology, Geochemistry, and Genesis of the Silesia-Cracow Zinc-Lead District, Southern Poland
Abstract Zinc and lead ores of the Silesia-Cracow district in southern Poland occur mainly in dolostones of the Middle Triassic Muschelkalk Formation but less important deposits and occurrences are also present in Jurassic, Lower Triassic, and Devonian carbonate rocks. The most important deposits are hosted in the “ore-bearing dolostone” which occurs mainly in the lower Muschelkalk Formation. The ore-bearing dolostone consists of extensive diagenetic replacement of limestone and locally, sparry dolomite cement related to ore deposition. Replacement of the carbonate rocks by sulfide minerals is the principal type of ore occurrence; lesser amounts occur as open-space filling of fractures and as cement for breccias of tectonic, dissolution collapse, and sedimentary origins. Sulfide mineralization in ore-stage hydrothermal dissolution collapse breccias is locally well developed in some ore deposits. However, most of the ore-bearing dissolution collapse breccias are interpreted to be the result of selective sulfide replacement of pre-ore collapse breccias. Values of lead isotopes show no variation through the district or the paragenetic sequence and are consistent with the lead being derived from a large crustal reservoir. The lack of measurable variation in the lead isotopic data and conodont CAI studies suggests that the duration of mineralization must have been relatively short. Fluid inclusions in sphalerite are mostly two-phase aqueous liquid plus vapor but organic liquid-bearing fluid inclusions are abundant. Fluid inclusion homogenization temperatures in sphalerite are between 40° and 156°C and salinities range from near 0 to > 23 wt. % NaCl eq. Fluid-inclusion homogenization temperatures increase with depth below the surface and are consistent with a cooling gradient of the ore-fluids of about 6° to 10°C per hundred meters. Temperature-salinity relationships and their variations widi depth are interpreted to indicate the mixing of multiple fluids during ore formation. Analysis of electrolytes in inclusion fluids show that later ore stage sulfides have significantly more bromide, ammonia, and acetate than sulfides in early ore stages. Fluid inclusion gases in sphalerite and galena appear to contain at least two end-member compositions characterized by either CO 2 -CH 4 or CO 2 -H 2 S gas compositions and are consistent with the presence of multiple ore fluids in the ore-forming environment. The deep circulation of fluids inboard from the Carpathian orogenic belt during waning stages of Alpine orogeny may have allowed fluids to acquire heat and extract zinc and lead from a large crustal reservoir to form a metal-bearing fluid. Late Alpine faulting together with the reactivation of pre-existing basement faults along the Cracow-Myszkow zone enhanced the fracture permeability in the carbonate rocks of the district and provided pathways for the ascent of metal-bearing fluids. The mixing of relatively hot, Zn-Pb bearing fluids with fluids from diverse aquifers containing reduced sulfur of different sulfur isotopic compositions can account for the wide range in sulfur isotopes and fluid inclusion observations. Faulting in the ore district, coeval with migration of the ore forming fluids, produced fundamental changes in ore fluid pathways and aquifers. These changes account for the temporal trends in the chemical and isotopic character of the ores through the mineral paragenesis.