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Showing 1 to 16 of 16 for “"Paragenetic sequence"”.
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Relative timing of dolomitization and silica cementation in the Cambrian Potosi and Eminence Dolomites in the Illinois Basin, USA
… hand sample and thin section analyses. A paragenetic sequence was established in this study via the integrated application of sedimentologic, stratigraphic, and high-resolution plane-light (PL) and cathodoluminescence-light (CL) petrography techniques. The original shallow marine limestone …
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Petrology and mineralogy of certain portions of the Fredericktown deposits
… approach to the intergrowth indices to derive a paragenetic sequence for the sulphides, based on quantitative geometric observations of ore samples and concentration products.</p> <p>The paragenetic sequence of the sulphides is as follows: marcasite and pyrite-bravoite; siegenite and chalcopyrite …
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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
… the construction and interpretation of a complex sequence of paragenetic events. Core samples were collected from the Illinois Basin-Decatur Project CCS injection well. The 1.8-2.1 km interval of the well was sampled using a Schlumberger mechanical sidewall coring tool, a Modular Formation …
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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
<p>“A detailed paragenetic study of Pb-Zn-Cu ores from the Viburnum Number 28, Brushy Creek, and Goose Creek mines in the Southeast Missouri lead district indicates a complicated paragenesis characterized by repeated periods of mineral deposition. The sequence is composed of nineteen minerals …
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The origin and behaviour of carbonate minerals in diverse environments: from subduction zones to asteroids
… and isotope analysis. Finally, the detailed paragenetic sequence of the CM parent asteroid(s), including multiple carbonate formation events was explored using the combination of Raman spectroscopy, electron probe microanalysis, and nanoscale secondary ion mass spectroscopy.
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Paleogeothermal Conditions in the Illinois Basin During Late Paleozoic Coalification
… was channeled through Mississippian strata. The paragenetic sequence above the unconformity is different from that below, suggesting that, the unconformity separates two distinct paleohydrologic systems. The modeling indicates that the best scenario is one with a transient heat source at the …
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Volcanic stratigraphy and lithochemistry of the lower Jurassic Hazelton group, host to the Eskay Creek precious and base metal volcanogenic deposit
… is an integral part of the igneous paragenetic sequence.
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The geochemistry of carbonate-hosted Pb-Zn-Ag mineralization in the Lavrion District, Attica, Greece: fluid inclusion, stable isotope, and rare earth element studies
… but are more abundant late in the paragenetic sequence with fluorite and barite. Fluid inclusion studies of sphalerite, fluorite, calcite, and quartz in carbonate-replacement deposits suggest that they were deposited in thermal pulses (132°-365°C) from CO2-poor, low- to …
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Microfacies Analysis, Sedimentary Petrology, and Reservoir Characterization of the Sinbad Limestone Based Upon Surface Exposures in the San Rafael Swell, Utah
… pressure dissolution, and dolomitization. The paragenetic sequence progresses from marine to meteoric to burial. Marine and meteoric cements occlude much of the depositional porosity. Hydrocarbon-lined interparticle and separate vug (largely molds) pores (1-5%) characterize the skeletal-oolitic …
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Mineralogical characterization and paragenesis of the Cripple Creek deposit, Colorado
… deposit, and many of the previously published paragenetic sequences that describe the relationship of different ore, gangue, and alteration minerals are contradictory. Conflicting parageneses and deposit models indicate that revision is needed in order to better understand how the Cripple Creek …
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A Comparison of Geochemistry, Carbonate Mineralogy, and Argillic Alteration between the Dome Prospect and the Main Au Resource of the Donlin Creek Project in Southwest Alaska
… at Dome compared to the resource area. A paragenetic sequence showing the temporal relationship of through-going veins, sulfide and carbonate mineralogical associations, and sulfur, carbon, and oxygen isotopic analyses demonstrate the genetic relationship between these two dissimilar ore …
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The sedimentology and diagenesis of copper-bearing rocks of the southern margin of the Damaran Orogenic Belt, Namibia and Botswana
… morphological type can be correlated using megasequences (10's to 100's m. thickness of sediment). Thin, broad fans were probably formed by regional uplift and unconfined sediment discharge, whereas thick, narrow fan complexes were produced by localized uplift with sediment discharge through …
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Investigation of the Geology, Structural Setting and Mineralisation the Copper-Sulphide Deposits in the Messina Area, Limpopo Mobile Belt, South Africa
… The study further establishes the paragenitic sequence of ore mineralisation, comprising four stages: Stage I (Garnet- graphite – Fe oxides); stage II (Quartz- pyrite); stage III (Pyrite- sphalerite - chalcopyrite); and stage IV (Carbonates). Stage III represented the main stage of sulphide ore …
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Subsurface dolomitization and porosity occlusion within Early to Middle Ordovician strata of the Illinois Basin, USA
Analysis of sedimentological, stratigraphic, paragenetic and geochemical characteristics of samples from the Early Ordovician Shakopee Dolomite and Everton Formation, and the overlying Middle Ordovician St. Peter Sandstone, obtained from drill cores and outcrops in the Illinois Basin indicate that …
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Petrology and geochemistry of the Killdeer carbonates
… of Dunn County, North Dakota is composed of a sequence of tuffaceous, calcareous, dolomitized and silicified flat lying sedimentary rocks of Tertiary age. It is the purpose of this report to describe and integrate the petrology and geochemistry of these sediments.</p> <p>Fieldwork was conducted …
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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
… repetition of these diagenetic events and the paragenetic ordering of mineralization, in conjunction with changes in isotopic (87Sr/86Sr) and elemental concentrations (Ca, Na, Sr, Fe, Mg, and Mn) in calcite growth zones, suggest changes in the fluid chemistry and the source of the subsurface …