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Showing 1 to 20 of 40 for “"Paragenesis"”.
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Pyrite porphyroblast paragenesis at the Cherokee Mine, Ducktown, Tennessee
… and micas that are used to determine the paragenesis of the porphyroblasts and the metamorphic history of the ore deposit. The ore mineralogy at the mine is: hexagonal pyrrhotite (60%), pyrite (30%), chalcopyrite (4%), sphalerite (3 %), and magnetite (3 %) with minor galena, molybdenum, …
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Mineralogical characterization and paragenesis of the Cripple Creek deposit, Colorado
The world-class Cripple Creek gold telluride deposit in central Colorado is centered on an Oligocene alkaline-magmatic system composed of diatremal Breccia that is intruded by dikes and sills that range in composition from phonolite to lamprophyre. The deposit has historic production of >24 Moz of …
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The Paragenesis of Synthetic Phyllosilicates on The Talc-Phlogopite Join
Made available in DSpace on 2014-12-14T07:10:55Z (GMT). No. of bitstreams: 1 8009209.pdf: 5670512 bytes, checksum: d414ddd5fb6a9fcb9a7a51e02c9753d6 (MD5) Previous issue date: 1979
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Paragenesis, fluid origin, and thermal history of a low-sulfidation epithermal gold-silver system
… km outside the mine area in order to construct a paragenesis, interpret fluid origin, describe the thermal history, and examine fluid inclusion gas compositions as an exploration tool for low-sulfidation deposits. Two-thirds of the gold from the Lesley Ann deposit is associated with pyrite, found …
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Paragenesis of Lacustrine Microbialites in the Upper Wilkins Peak Member, Green River Formation, Wyoming
… Peak Member were investigated to determine their paragenesis and to help interpret lake chemistry. Two specific microbialite beds were analyzed that are associated with the “layered tuff”. Samples were collected from correlated sections along a NW to SE, 24 km line of section from lake margin …
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Ore mineralogy and paragenesis of a portion of the Great Gossan Lead district, Virginia
The Great Gossan Lead is a Ne-Sw trending belt of sulfide mineralization extending over 28 kilometers through Carroll and Grayson Counties in southwestern Virginia. The zone, which occurs in the metamorphic Late Precambrian Ashe formation, consists of a series of an echelon mineralized pods which …
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The Mineralogy, Geochemistry and Phosphate Paragenesis of the Palermo #2 Pegmatite, North Groton, New Hampshire
An investigation of the beryl-phosphate subtype Palermo #2 pegmatite, located in the Grafton pegmatite field of New Hampshire, has revealed a large number of phosphate species. Late-stage, carbonate-bearing aqueous fluids have metasomatically altered primary phosphates producing a suite of nearly …
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Petrography and paragenesis of diagenetic mineral phases in cherty and dolomitic spiculite strata, Mississippian, South-central Kansas
… suppressed the deposition of carbonates. Paragenesis reveals that the most important and abundant diagenetic mineral phases are chert and dolomite, which partially to pervasively replaced the sediments early after they were deposited. Chertification was triggered in part by remobilization …
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Gold and Base Metal Mineralization, Hydrothermal Alteration and Vein Paragenesis in the Spring Valley Deposit, Pershing County, Nevada
Spring Valley is a gold-base metal deposit located on the eastern flank of the Humboldt Range in Pershing County, Nevada. Mineralization is primarily hosted within the Feldspar Porphyry, Agglomerate, Welded Tuff, Volcaniclastic Siltstone and Quartz-eye Rhyolite units of the Rochester Formation and …
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Geology, paragenesis, and geochemistry of sphalerite mineralization at the Young mine, Mascot-Jefferson City zinc district, East Tennessee
The Mascot-Jefferson City zinc district of East Tennessee is the major source of zinc in the United States. Sphalerite mineralization which occurs as a breccia infilling in the Lower Ordovician Knox Group carbonates has been studied in detail at the Young Mine, located in the central portion of the …
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Ultrahigh-resolution paragenesis of the Cambrian-age Mt. Simon Sandstone at a burial depth of 1.8-2.1 km, Illinois basin, USA
… has been undertaken to reconstruct the paragenesis of Cambrian-age Mt. Simon Sandstone quartz arenites buried at 1.8-2.1 km within the Illinois Basin. Results have yielded valuable new insight into the evolution of this important subsurface reservoir and provided the depositional and …
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The timing, composition, and source of subsurface diagenetic waters responsible for sulfide and carbonate mineralization in solution cavities of the ordovician galena group limestone, North Aurora, Illinois, USA
… mixing with formation waters. Comparison of the paragenesis of North Aurora with those from other regional MVT deposits indicates a related succession of diagenetic events, thus supporting possible involvement of a similar diagenetic fluid during dissolution and mineralization. However, the …
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Geology and Geochemistry of Sphalerite in Coal
… of silicates, sulfides, and carbonates. The paragenesis is kaolinite-(quartz?)-pyrite-sphalerite-pyrite-calcite.
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Mineralogical, textural, and paragenetic studies of selected ore deposits of the Southeast Missouri lead-zinc-copper district and their genetic implications
… Missouri lead district indicates a complicated paragenesis characterized by repeated periods of mineral deposition. The sequence is composed of nineteen minerals including abundant galena, sphalerite, chalcopyrite, pyrite, marcasite, dolomite, calcite, and quartz and minor siegenite, bornite, …
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CHARACTERIZING THE AURIFEROUS SYSTEM AT PORKY LAKE WITHIN THE PINE LAKE GREENSTONE BELT, NORTHERN SASKATCHEWAN, WITH A FOCUS ON PETROGRAPHY AND MINERAL CHEMISTRY
… are defined in the construction of a mineral paragenesis chart that defines five phases of sulfide mineral formation (including pyrite), three of which are associated with gold mineralization. The sulfide generations associated with mineralization include sieve-textured Py3-Po2-Ccp2 ± Sp-Gn in …
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Diamonds from the Ural Mountains: their characteristics and the mineralogy and geochemistry of their inclusions
… Ural diamonds of the peridotitic and eclogitic paragenesis suggest derivation from a similar, initially homogenous, mantle carbon source which has been subjected to metasomatic-induced isotopic fractionation. However, for some δ15N-enriched – δ13C-depleted eclogitic diamonds, the possibility of …
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Lithofacies, provenance, and diagenesis of jura-cretaceous strata of the Northern Bowser Basin, British Columbia
… processes in the basin. Seven stages of cement paragenesis are recognized in the sandstones: 1) chlorite; 2) illite; 3) kaolinite; 4) dead oil; 5) quartz; 6) chlorite dissolution; and 7) calcite. Estimated precipitation temperatures begin below 80°C for chlorite, and increase to approximately …
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A thermochemical study of the ore deposits of the Milliken mine, New Lead Belt, Missouri
… plus numerous periods of dissolution. The paragenesis provides evidence for the dynamic, evolving nature of the ore system. Galena textures, euhedral crystals to amorphous spheres, are interpreted to indicate that a wide range of supersaturation existed during mineralization. Textural …
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Manganese mineralization hosted by the Rocky Gap Sandstone in Bland County, Virginia
… goethite that occurs as a microbreccia. The paragenesis of the minerals was determined using polished sections, hand samples, and field relationships. Electron microprobe analyses were used to find a nominal chemical formula for romanechite. This formula was used to estimate the Gibbs free …
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