Fluorspar Deposits Origin
Uranium in Fluorite, a Case Study: The La Azul Fluorspar Deposit…
The maximum concentration of U in fluorite from the La Azul deposit was about 100 μg g ‑1 . Using Raman spectroscopy and microprobe analysis, we identified the micro-inclusions of uranium minerals as uraninite (of the pitchblende variety); its composition suggested a hydrothermal origin for this fluorspar deposit.
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Origin of the bedding replacement deposits of fluorspar in …
The banded fluorspar deposits of the Cave In Rock district are attributed to replacement of limestone and the preservation of bedding and cross-bedding of the rock. The solutions contained hydrofluoric acid which reacted with CaCO 3 . The replacement was stoichiometrical, with consequent reduction of volume, but continued deposition of calcium fluoride, brought in from …
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Petrologic relationship between lamprophyres, carbonatites, …
(b) Sub-surface schematic for the origin of PWIP melts, HREE-breccia and fluorspar deposits near Hicks Dome. The Mg-Ca carbonatites represent small amounts of primary mantle-derived carbonatite melt that interacted with shallow crustal carbonate rocks.
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Western Kentucky Fluorspar District
Origin of Deposits The vein and bedded deposits were formed by a release of fluorine-rich fluids from deep-seated alkalic intrusive rocks and by the intersection of these magmatic fluids with hydrothermal basinal fluids that were rich in base metals such as sphalerite, galena, and barite. These interactions of magmatic and hydrothermal fluids generated an …
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The El Pilote fluorite skarn: A crucial deposit in the …
The origin of Cu–Au deposits in the region is closely related to Late Mesozoic intermediate intrusions, which are mainly high‐K calc‐alkaline and shoshonitic series. ... Gronan, R.M., 1963 ...
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Origin of the Illinois-Kentucky fluorspar deposits
Review of articles by Brecke (Econ. Geology, v. 59, no. 2, p. 299-302, and no. 7, p. 1293-1297, 1964) suggests that the mineral zoning pattern is not well founded and that there is little evidence for the extensive lateral migration advocated by Brecke.
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Formation timing and genesis of Madiu fluorite deposit in …
The rare earth element (REE) characteristics indicate that the deposit is of hydrothermal origin. The δ 18 O H2O (−8.8‰ to −0.5‰) and δD H2O (−69.0‰ to −61.9‰) …
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Fluorite deposits in China: Geological features, metallogenic
China enjoyed continuously increasing identified reserves of fluorite resources in recent years. According to the statistics in the Summary of Reserves of China 's Mineral …
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Fluorspar Deposits in Western Kentucky
Fluorspar Deposits in Western Kentucky Part 1 A. Introduction By JAMES STEELE WILLIAMS and HELEN DUNCAN B. -Babb fault system, Crittenden and Livingston ... The rocks in the region are largely of sedimentary origin; but dikes, sills, and irregularly shaped bodies of intrusive rocks are pres ent. These igneous bodies are mainly lamprophyres or ...
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ARIZONA FLUORSPAR
Almost all fluorspar deposits contain various amounts of impurities such as silica, calcite, barite, and metallic sulfides and therefore require beneficiation. ... The principal Arizona fluorspar …
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3D modeling for mineral resource assessment of fluorite ore …
The wide range of grades of the Tirremi fluorspar determines the feasibility of the mining project and allows for its use in various industrial applications. ... Weber B (2010) Variation of color, structure, and morphology of fluorite and the origin of the hydrothermal F-Ba deposits at Nabburg-Wölsendorf, SE Germany. Neues Jb Miner Abh 187(2 ...
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The fluorspar deposits of Saint Lawrence, Newfoundland
Fluorspar from Newfoundland, eighth ranking producer of the world, comes entirely from the St. Lawrence district. Here pre-Cambrian lavas and pyroclastics, Cambrian sedimentary rocks, Ordovician (?) volcanic and sedimentary rocks, and a Paleozoic alaskite-granite comprise the bedrock.Epithermal fluorite veins occupy steeply dipping fault fissures in granite, rhyolite …
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(U–Th)/He dating of fluorite: application to the La Azul fluorspar …
The (U–Th)/He dating method was applied to fluorite of the La Azul fluorspar deposit, Taxco mining district, Mexico. Ages of ten U-rich (4–94 μg/g) samples range from 30 to 33 Ma (mean 32±2 Ma, 1σ). This age range is interpreted as the time of primary fluorite precipitation and is close to the K/Ar age of sericite from a small fluorspar deposit (Los …
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Uranium in Fluorite, a Case Study: The La Azul Fluorspar Deposit…
The maximum concentration of U in fluorite from the La Azul deposit was about 100 μg g−1. Using Raman spectroscopy and microprobe analysis, we identified the micro-inclusions of uranium minerals as uraninite (of the pitchblende variety); its composition suggested a hydrothermal origin for this fluorspar deposit.
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New St. Lawrence mine owners promising big …
Commercial mining began in the 1930s, with St. Lawrence boasting one of the largest fluorspar deposits in North America. Mine will be an 'engine of wealth'
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Rare Earth Deposits of North America
Abstract. Rare earth elements (REE) have been mined in North America since 1885, when placer monazite was produced in the southeast USA. Since the 1960s, however, most North American REE have come from a …
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SLIDE SHOW
The geology of the fluorspar deposits is described by Staatz and Osterwald (1959) and Staatz and Carr (1964). ... Mineralization processes involving both hydrothermal and meteoric fluids have been proposed to explain the origin of …
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Fluorite and Fluorspar: Mineral uses and …
Fluorite has a wide variety of uses. The primary uses are in the metallurgical, ceramics, and chemical industries; however, optical, lapidary, and other uses are also important. Fluorspar, the name used for fluorite when it is sold as a bulk …
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Stable isotope constraints on the source of ore fluids for the …
Hicks Dome is comprised of coarse crystalline Mississippi Valley Type deposits at shallow levels and an enigmatic, fine-grained fluorite, rare earth elements, Y, high field strength elements, Be, and Ba rich deposit at deeper levels. Phyllosilicates from a lamprophyre dike and a breccia from two Hicks Dome drill cores were sampled to resolve the fluid history of the entire …
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The "El Pilote" fluorite skarn: A crucial deposit in the …
Fluorite deposits are widespread in northern Mexico and those deposits have traditionally been categorized as exclusively hydrothermal–magmatic in origin. Recently, two different fluorite-bearing type models have been proposed for the Northern Mexican deposits: (1) MVT-like deposits formed from basinal brines mobilized during the Laramide Orogeny (La …
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Uranium in Fluorite, a Case Study: The La Azul Fluorspar Deposit…
4. In line 264-265, some ages of deposits were cited. But I am confused that these dated deposits were also spread in the La Azul area or other locations. 5. In line 358-359, we can get that the Morelos formation with carbonates has high values of fluorite. In Line 430-431, it was gotten that calcite clasts were free from uranium.
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A New Classification Scheme of Fluorite Deposits
1. Introduction. Fluorite (CaF 2), also commercially known as fluorspar, is an important industrial mineral that is used as a raw material in the metallurgical, ceramic and chemical industries apart from optical and lapidary uses.Fluorite belongs to the isometric system, with a cubic, face-centred lattice. It commonly forms octahedrons or cubes, less commonly dodecahedrons and rarely ...
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Geology and fluorspar deposits, Northgate district, Colorado
The fluorspar deposits in the Northgate district, Jackson County, Colo., are among the largest in Western United States. The mines were operated intermittently during the 1920's and again during World War II, but production during these early periods of operation was not large. Mining was begun on a larger scale in 1951, and the district has assumed a prominent position …
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A model for subduction origin and distribution of …
Figure 1, which is modified from Peters (1958), shows the distribution of fluorite deposits of hydrothermal origin in the western United States and Mexico. An obvious linear trend of …
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Petrology, geochemistry, and mineralogy of pyroxene and …
Field observations, petrography, electron microprobe analysis (EPMA), geothermometry, and geochemical analyses (ICP-MS and XRF) of the fluorspar deposit associated with the Late Cretaceous alkaline igneous-carbonatite complex at Okorusu (Namibia) have identified two previously unrecognized types of carbonatites, namely pyroxene and pegmatitic carbonatites. …
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Geology and Mineral Deposits of the Poncha Springs NE …
deposits. The late Tertiary fluorspar deposits formed under near-sur face hot spring conditions from very dilute fluids; primary fluid inclusions in the fluorite are essentially fresh water. Study of the inclusions indicates that the temperature of deposition was about 119°-168°C. The heat and fluoride are regarded as vol
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Fluorspar Deposits of Burro Mountains and Vicinity …
fluorspar deposits are arranged around the Tyrone stock and along the Malone fault, south and west of the Burro Mountains. ... author delve deeply into the problems of paragenesis and the origin of the fluorine-bearing solutions. His purpose is merely to present the maps and brief discussions of the individual deposits. A complete
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The giant Vergenoeg fluorite deposit in a magnetite-fluorite …
Vergenoeg is one of the largest fluorspar deposits worldwide (Fourie, 2000), but its formation is poorly understood. Petrogenetic models include a solely hydrothermal origin (Borrok et al., 1998 ...
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A model for subduction origin and distribution of …
A model for subduction origin and distribution of fluorite deposits in the western United States Albert L. Lamarre ... Worl, R. G., 1974, Geology of fluorspar deposits of the western United States, in A Symposium on the Geology of Fluorspar: Kentucky …
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The Origin of Ore Deposits of the Mississippi Valley Type
Certain gross aspects of the different lead-zinc-barìte-fluorspar deposits of this type in North America provide compelling guidelines that must be followed in determining the most likely mode of origin for the deposits. These field-determined facts must be the starting point for the interesting and illuminating laboratory investigations which ...
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