Results 191 to 200 of about 5,374 (232)

Directional regulation and mechanism analysis of the surface properties of hydrothermal carbon by circulating liquid in the hydrothermal carbonization procedure

Environmental Research, 2023
The complexity of the chemistry behind the hydrothermal conversion is enormous. Components interact with their own physical and chemical structure, making it harsh to understand the conversion as a whole. Herein, the six-water recirculation and loading nano SiO2 experiment in a one-pot hydrothermal carbonization procedure was designed to elucidate the ...
Xiaojie Fang, Di Zhang, Yanming Feng, Xiang Li, Ding Ding, Xinting Wang, Ziqi Xu   +6 more
openaire   +2 more sources

Tracing fluid–rock reaction and hydrothermal circulation at the Saldanha hydrothermal field

Chemical Geology, 2010
The Saldanha hydrothermal field is positioned on the top of a seamount located in a non-transform offset (NTO5) on the Mid-Atlantic Ridge (MAR). This hydrothermal system was first described as a low-temperature diffuse field, driven by peridotite–seawater reactions following the detection of high concentrations of CH4 and H2 in the water column, and ...
Dias, A.S., Mills, R.A., Ribeiro da Costa, I., Costa, R., Taylor, R.N., Cooper, M.J., Barriga, F.J.A.S.   +6 more
openaire   +2 more sources

Controls on the physics and chemistry of seafloor hydrothermal circulation

Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, 1997
Low temperature diffuse hydrothermal circulation is a natural consequence of the cooling of the oceanic lithosphere. Diffuse flow is expected to be ubiquitous, and will be present both within mid–ocean ridge crest axial zones of young age (0–1 Ma), and also on the older ridge crest flanks and limbs.
Adam Schultz, Henry Elderfield
openaire   +1 more source

Modeling Permeability Changes Caused by Hydrothermal Circulation

Natural Resources Research, 2000
A new model for simulating porosity and permeability changes caused by sedimentary reservoirsdiagenesis is presented. Permeability is computed from changes in the mineral volume fractionsresulting from precipitation and dissolution of the rock-forming mineral as fluid flows throughvariable salinity and temperature fields. Its evolution is controlled by
Philippe Gouze, Anne Coudrain-Ribstein
openaire   +1 more source

Numerical models for hydrothermal circulation in the oceanic crust

Journal of Geophysical Research, 1976
Two-dimensional numerical calculations of hydrothermal circulation in permeable oceanic crust have been carried out. The effects of Rayleigh number, impermeable and permeable upper boundaries, and permeability variations with depth have been investigated. Flow and temperature fields as well as surface heat flux distributions are presented.
R. J. Ribando, K. E. Torrance, D. L. Turcotte   +2 more
openaire   +1 more source

Chert in the Pacific: Biogenic silica and hydrothermal circulation

Palaeogeography, Palaeoclimatology, Palaeoecology, 2008
Abstract Data on sections drilled by DSDP and ODP in the Pacific have been compiled for 187 sites, 105 of which contain chert. The spatial pattern of siliceous deposits in the Pacific generally follows the pattern of biologic productivity. There is some evidence that enhanced vertical diffusivity in the ocean during the Eocene warm climate gave rise ...
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Hydrothermal Circulation and Geochemical Flux at Mid-Ocean Ridges

The Journal of Geology, 1976
The flow rate of sea water through sub-sea-floor hydrothermal systems at mid-ocean ridges has been estimated at $$1.3-9 \times 10^{17} g/yr$$ by consideration of the rate at which circulating fluid must advect heat out of the spreading plates into the oceans.
Thomas J. Wolery, Norman H. Sleep
openaire   +1 more source

Heat Flow and Hydrothermal Circulation in the Cascade Range, North-Central Oregon

Science, 1989
In north-central Oregon a large area of near-zero near-surface conductive heat flow occurs in young volcanic rocks of the Cascade Range. Recent advective heat flux measurements and a heat-budget analysis suggest that ground-water circulation sweeps sufficient heat out of areas where rocks younger than 6 Ma (million years ago) are exposed to account for
S E, Ingebritsen, D R, Sherrod, R H, Mariner   +2 more
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Abyssal peridotite constraints on hydrothermal fluid circulation

Goldschmidt2023 abstracts, 2023
Jessica Warren, Cécile Prigent, Suzanne Birner, Kendra Lynn, Elizabeth Cottrell, Fred Davis   +5 more
openaire   +1 more source

Cascadia Hydrothermal Circulation IN Oceanic Crust [Slides]

2022
Clara Stanbury, Glenn Spinelli, Robert Harris, Anne Trehu   +3 more
openaire   +1 more source