The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Geofluids (2010) 10, 206–216
AbstractHydrologic responses to earthquakes, including liquefaction, changes in stream and spring discharge, changes in the properties of groundwater such as geochemistry, temperature and turbidity, changes in the water level in wells, and the eruption of mud volcanoes, have been documented for thousands of years. Except for some water‐level changes in the near field...
Geofluids (2010) 10, 114–131
AbstractAt many subduction zones, accretionary complexes form as sediments are offscraped from the subducting plate, and excess pore pressures commonly develop as low‐permeability marine sediments undergo rapid tectonically driven loading. Mechanical models demonstrate that pore pressure controls the overall geometry of these systems by modifying shear strength both within...
Geofluids (2010) 10, 41–57
AbstractComplexation by ligands in hydrothermal brines is a fundamental step in the transport of metals in the Earth's crust and the formation of ore deposits. Thermodynamic models of mineral solubility require an understanding of metal complexation as a function of pressure, temperature and composition. Over the past 40 years, mineral solubilities and complexation equilibria...
Geofluids (2010) 10, 293–311
AbstractThe first occurrence of immiscibility in magmas appears to be most important in the magmatic–hydrothermal transition, and thus studies of magmatic immiscibility should be primarily directed towards recognition of coexisting silicate melt and essentially non‐silicate liquids and fluids (aqueous, carbonic and sulphide). However, immiscible phase separation during...
Geofluids (2010) 10, 73–82
AbstractFluid inclusion data, particularly the distribution of hydrocarbon fluid inclusions and their chemistry, can provide insights into oil charge in a petroleum‐prospective region. Examples from the UK Atlantic margin show how we can understand thermal regime, timing and chemistry of oil charge. Data from the UK Atlantic margin based on fluid inclusion temperature profiles...
Geofluids (2010) 10, 132–141
AbstractWhile the fundamental influence of fluid properties on venting temperatures in mid‐ocean ridge (MOR) hydrothermal systems is now well established, the potential interplay of fluid properties with permeability in controlling heat transfer, venting temperatures, and venting salinities has so far received little attention. A series of numerical simulations of fully...
Geofluids (2010) 10, 241–253
AbstractThe brittle upper continental crust predominantly consists of granite and gneiss. Fractures form an interconnected network of water‐conducting structures with an appreciable permeability also providing substantial fluid‐saturated fracture porosity. The chemical composition of fluids in the fracture porosity of granite and gneiss changes with depth. Near the surface...
Geofluids (2010) 10, 270–292
AbstractFluid circulation at basement/cover unconformities is of first importance for metal transfer and especially the formation of Pb–Zn, F, Ba and U‐deposits. This is typically the case for world‐class Proterozoic U deposits (Canada, Australia, Gabon) in basins, which show many similarities with younger Pb–Zn–F–Ba systems (Irish Paleozoic Pb–Zn deposits, F–Pb–Zn–Ba...
Geofluids (2010) 10, 234–240
AbstractThe rate of reaction of a natural hornblende garnet granulite with water under a range of mid‐ to lower crustal conditions has been investigated experimentally. In runs of between 7 and 84 days small but measurable amounts of water were consumed, and sheet silicates (300°C, 300 MPa and 400°C, 400 MPa) and/or secondary actinolite (400°C, 400 MPa and 500°C, 500...
Geofluids (2010) 10, 94–113
AbstractThe petroleum industry uses subsurface flow models for two principal purposes: to model the flow of hydrocarbons into traps over geological time, and to simulate the production of hydrocarbon from reservoirs over periods of decades or less. Faults, which are three‐dimensional volumes, are approximated in both modelling applications as planar membranes onto which...
The general major component composition of aqueous fluids at elevated pressure and temperature conditions can be represented by H2O, different non‐polar gases like CO2 and different dissolved metal halides like NaCl or CaCl2. At high pressure, the mutual solubility of H2O and silicate melts increases and also silicates may form essential components of aqueous fluids. Given the huge range of P–T–x...
Geofluids (2010) 10, 193–205
AbstractThe variation of permeability with depth can be probed indirectly by various means, including hydrologic models that use geothermal data as constraints and the progress of metamorphic reactions driven by fluid flow. Geothermal and metamorphic data combine to indicate that mean permeability (k) of tectonically active continental crust decreases with depth (z) according...
Geofluids (2010) 10, 254–269
AbstractMetamorphism and metasomatism both involve the reequilibration of mineral assemblages due to changes in pressure, temperature and/or chemical environment. Both processes involve material transport but on different length scales, so every metamorphic reaction is metasomatic on a local scale. Fluids provide a transport mechanism which is orders of magnitude faster...
Geofluids (2010) 10, 142–160
AbstractWe describe how seafloor heat flow is determined, review current understanding of advective heat loss from oceanic lithosphere, and present results from three field areas to illustrate how heat flow measurements are used (along with complementary data) to resolve fluid flow rates and patterns. Conductive heat flow through much of the seafloor is lower than predicted...
Geofluids (2010) 10, 20–40
AbstractWe present a thermodynamic model for mineral dissolution in aqueous fluids at elevated temperatures and pressures, based on intrinsic thermal properties and variations of volumetric properties of the aqueous solvent. The standard thermodynamic properties of mineral dissolution into aqueous fluid consist of two contributions: one from the energy of transformation...
Geofluids (2010) 10, 217–233
AbstractPermeability enhancement associated with deformation processes in faults and shear zones plays a key role in facilitating fluid redistribution between fluid reservoirs in the crust. Especially in high fluid flux hydrothermal systems, fracture‐controlled permeability can be relatively short‐lived, unless it is repeatedly regenerated by ongoing deformation. Failure...
Geofluids (2010) 10, 161–192
AbstractCalculations are presented of the extent to which chemical disequilibria are generated when submarine hydrothermal fluids mix with sea water. These calculations involve quantifying the chemical affinity for individual reactions by comparing equilibrium compositions with the compositions of mixtures in which oxidation–reduction reactions are inhibited. The oxidation–reduction...
Geofluids (2010) 10, 58–72
AbstractChloride‐rich brines are increasingly recognized as playing an important role in high pressure and temperature metamorphic and magmatic systems. The origins of these saline multicomponent fluids are debated, but experimental evidence suggests that regardless of their origin they must be important agents of rock alteration and mass transfer wherever they occur. Studies...
Geofluids (2010) 10, 83–93
AbstractSpatial variations in the salinity of pore waters in sedimentary basins can provide important insight into basin‐scale hydrogeologic processes. Although there have been numerous studies of brine seeps in the deep water Gulf of Mexico, much less is known about porewater salinities in the vast areas between seeps. A study has been made of spatial variation in pore...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.