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Showing 1 to 14 of 14 for “"magmatic fluids"”.
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Development of New Methods to Control Redox Conditions in High-pressure Experiments and their Application to Study Ore Metal Solubilities in Sulfur-bearing Magmatic Fluids
… of Cu, Ag and Au in S-rich Cl-bearing magmatic fluids were determined at T = 900 ⁰C and P = 2000 bar covering a wide range of fO2 from NNO – 0.5 to NNO + 2.5 with 7 steps in-between. Thermodynamic model calculations were performed using the HCh software to determine the dominant species …
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Magmatic and volcanic processing of volatile and chalcophile elements
… on the relative importance of the various magmatic processes involved. An important and undisputed step in the process is the generation of a hydrothermal saline magmatic fluid with a proclivity to carry high quantities of metals. These fluids exsolve at depth from fractionating magmas and …
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Conduction Plus Convection Heat Flow Modeling for the Linga Complex, Peruvian Coastal Batholith
… affecting the thermal evolution of the Linga magmatic intrusion in the Ica-Pisco area of the Peruvian Coastal Batholith were studied using field work, petrography, geochemistry data, and computer modeling. Field work and petrography involved collecting samples for geochemical analysis and …
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Boron metasomatism in the Alta stock contact aureole, Utah
… stock and migrated down-temperature in exsolved magmatic fluids. Boron stable isotope measurements of carbonates, skarns and mineral separates range from $-$7.2 to +1.6$\perthous\ \delta\sp{11}$B. A value of ${-}6.0\perthous$ for a B-enriched igneous sill falls within this range and also …
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Geology and geochemistry of the Bully Hill area of the East Shasta district, Shasta County, California.
… barite. ΣSO₄⁼ and H₂S contents of hydrothermal fluids decreased from Stages 2a to 3a. δ³⁴S values of sulfides increased successively from Stages 1 (-15.8 per mil) to 3a (3.0 per mil), reflecting variable inputs of biogenic sulfur and deep-seated fluid evolution. δ³⁴S values of syngenetic barites …
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Fluid evolution in the nepheline syenites of the Ditrău Alkaline Massif, Transylvania, Romania
… 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 in nepheline, aegirine, albite and cancrinite provide evidence for the role of highly saline fluids in incongruent …
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The Marcona - Mina Justa District, South-Central Perú: Implications for the Genesis and Definition of the Iron Oxide-Copper (-Gold) Ore Deposit Clan
… below 450°C and with the exsolution of aqueous fluids with magmatic stable isotopic compositions. Subsequent, subeconomic chalcopyrite - pyrite - calcite ± pyrrhotite ± sphalerite assemblages were deposited from cooler fluids with similar δ34S, δ18O and δ13C values, but higher δD, which may …
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Geodynamic Evolution of the Aegean Back-arc and its Implication for Associated Precious and Base Metal Mineralization
… deposits tapped different sources of metals and fluids along the major low-angle detachment systems and steep normal faults. This study links the regional metallogenic diversity to fluid and crustal sources, within a framework of the evolving geodynamic context and complex basement structure. …
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Silicate Melt Inclusions in Igneous Petrogenesis
… they are crystalline and hidden by exsolved magmatic volatiles. The inclusions range in size from less than 5 to over 150 μm. In order to evaluate the magmatic contribution to economic mineralization, we conducted three separate studies to determine whether or not crystallized melt inclusions …
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The Nature of Fluids in Hydrothermal Copper and Molybdenum Ore Deposits - An experimental and analytical study
The evolution of magmatic-hydrothermal fluids in porphyry Cu and porphyry Mo deposits was studied using synthetic and natural fluid inclusions by optical microscopy, microthermometry, Raman spectroscopy, and LA-ICP-MS. The partitioning of Cu between vapor and brine in aqueous NaCl-S ± KCl ± …
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Multi-stage orogenic gold mineralization of the Pine Lake greenstone belt: evidence from the Seabee Gold Operation, Trans-Hudson orogen, northern Saskatchewan
… and include the i) influx of polymetallic magmatic-hydrothermal fluids pre-D1 (Py1); ii) late D2 to early-syn D3 injection of metamorphic fluids during diachronous metamorphism at different levels in the crust and the onset of orogenic-style mineralization (Py2); iii) influx of metamorphic …
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Investigating Volcano-Tectonic Interactions in the Natron Rift, East Africa with Implications for Understanding Volcanic Eruptive Processes
… driven by the interplay between repeated magmatic and tectonic activities, which have been explored through both tectonic and magma-assisted rifting models. Understanding volcano-tectonic interactions is key for evaluating the role of magmatic fluids in facilitating the initiation of …
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Geology of the Archean Côté Gold Au(-Cu) intrusion-related deposit, Swayze Greenstone Belt, Ontario
… have resulted in the generation of mineralized magmatic-hydrothermal fluids that are thought to be responsible for generating the Côté Gold deposit. The sequence of alteration types, their zonation in the deposit and their chemistry (i.e., gains and losses, REE patterns, metal associations and …
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Crust-mantle interactions and connections with the geodynamic system in the origin and circulation of fluids in the Comoros Archipelago - Indian Ocean
The role of fluids in crust-mantle interactions is of crucial importance in providing information regarding the definition of the origin of magmas, the identification of their depths of origin, and the nature of the interaction processes that determine their characteristics. Complex geodynamic …