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Showing 1 to 15 of 15 for “"Fluid Evolution"”.
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Physical and chemical aspects of fluid evolution in hydrothermal ore systems
… physical model describing two-phase fluid flow is used to simulate the effect of boiling on silica precipitation in geothermal and epithermal precious metal systems. The extent to which decreasing temperature and fluid vaporization are responsible for quartz precipitation is dependent …
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Geochemical controls on the fluid evolution of submarine and subaerial ore-forming hydrothermal systems
… the potential links between the variability of fluid compositions in submarine hydrothermal vents on the modern seafloor and the diversity of hydrothermal alteration mineralogy surrounding VHMS deposits in ancient volcanic terranes. Compiled data of natural vent fluid compositions from the …
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Fluid evolution and mineralising potential in the outer margin of the southern Gariep Belt
Fluid inclusion analyses of quartz veins of various generations from the outer margin of the southern Gariep Belt reveal the presence of two chemically distinct fluid populations: the pre-orogenic, rift-related Rosh Pinah ore-forming fluid and the orogenic fluids. The oreforming fluid is more …
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Fluid evolution in the nepheline syenites of the Ditrău Alkaline Massif, Transylvania, Romania
… of the complex. Petrographic observations and fluid inclusion studies were performed on nepheline syenites in order to examine the evolution and the effect of the magmatic fluids on the alteration of nepheline to secondary minerals as sodalite, cancrinite and analcime. Fluid inclusion studies …
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Fluid evolution during metamorphism and uplift of the massive sulfide deposits at Ducktown, Tennessee, U.S.A.
… and underwent little retrograde exchange. Fluid inclusion and petrologic data do not support the previous interpretation that low δ¹⁸O zones near orebodies are synmetamorphic, rather, a premetamorphic origin is indicated. Integrated fluid/rock ratios were low enough during and after …
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Fluid Evolution and Structural Control on Uranium Deposits in Successor Basins in Northern Canada and Northern Australia
… the character and timing of ore-forming fluids and the structural control on uranium mineralization. The work focused on two successor basins that share similar geological characteristics: the Martin Lake Basin in the Beaverlodge area in Canada, and the El Sherana Basin in the South …
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The role of gypsum in Cu-Co ore genesis within the Upper Miocene Boleo deposit of the Santa Rosalía Basin, Baja California Sur, México
… research on the geology, mineralization, and fluid evolution of the Boleo deposit in the Santa Rosalía basin, focusing on the role of evaporite bodies and fault networks in cobalt mineralization. The lithofacies description and sedimentological analysis of Boleo gypsum in Arroyo Boleo reveal a …
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Boron metasomatism in the Alta stock contact aureole, Utah
The effects of fluid evolution and infiltration in the Alta stock contact aureole, Utah, were studied by evaluating chemical additions and depletions in igneous, replacement skarn, and carbonate whole-rock samples. Of the major and trace elements studied, boron proved to be the most interesting …
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Forging ahead : the Ames family of Easton, Massachusetts and two centuries of industrial enterprise, 1635-1861
… of shovels, he made an important step in the evolution from artisan and craftsman to industrialist, a common transition well exemplified by Oliver Ames's life. The Ames story demonstrates that the "Industrial Revolution" was no revolution at all. It was a gradual and fluid evolution from one …
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Geology and geochemistry of the Bully Hill area of the East Shasta district, Shasta County, California.
… portion of the zones led to cyclic sealing of fluid flow, rupturing of the seal, quartz supers aturation, focused fluid discharge, and formation of sulfide mounds on the seafloor. Syngenetic mineralization occurred in several stages: (1) deposition of fine-grained banded sulfides and gangue; …
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Trace Elements and Sulfur Isotope Variations in Endowed and Non-Endowed Porphyry Systems of the Dawson Range Mineral Belt, Yukon Territory
… insights into the provenance, geological and fluid evolution, as well as potential alteration and weathering zones within porphyry systems. They are, however, insufficient to definitively confirm the endowment criteria of mineral deposits, as fractionation factors are subject to changing …
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Metal- and alteration-zoning, and hydrothermal flow paths at the moderately-tilted, silica-saturated Mt. Milligan copper-gold alkalic porphyry deposit
… contours reflect the magmatic-hydrothermal fluid evolution, and indicate late-stage ingress of peripheral fluids into the Cu-Au zone. Carbonate C- and O-isotope compositions corroborate the magmatic fluid path from the Cu-Au rich zone to Au-rich zone with decreasing depth. Strontium isotopic …
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Hydrothermal alteration of the ocean crust: insights from Macquarie Island and drilled in situ ocean crust
… and volume of circulating hydrothermal fluids, and the extent of partitioning between high temperature axial- and low temperature ridge flank- systems, but these processes remain poorly constrained. This study uses whole rock and secondary mineral chemistries of altered ocean crust to …
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PVTX and Raman Spectral Properties of Fluids at Elevated Pressures and Temperatures
Fluids are associated with a wide range of physical and chemical processes in the Earth, including transporting and concentrating important ore elements such as Cu, Au, Zn, and Pb. Significant amounts of fluid may be generated as a result of dehydration or decarbonation reactions, and the volatile …
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Rare earth element systematics in ancient and modem hydrothermal systems
The geochemical significance of on-axis diffuse fluids, in addition to those formed during the waning phases of hydrothermal systems and off-axis crustal ageing processes, has been investigated through a comparison of the rare earth element (REE) systematics of hydrothermal materials from the …