Results 291 to 300 of about 37,037 (337)

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   +3 more sources

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.
Robert J. Ribando, D. L. Turcotte, K. E. Torrance   +2 more
openaire   +2 more sources

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

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   +2 more sources

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 ...
openaire   +2 more sources

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
D. R. Sherrod, R. H. Mariner, Steven E. Ingebritsen   +2 more
openaire   +3 more sources

Geochemical origin of methane in hydrothermal fluid and its implication for the subseafloor hydrothermal circulation at the Middle Okinawa Trough

Geo-Marine Letters, 2021
Hydrothermal systems are ubiquitous in various tectonic settings and are important in transferring internal mass and energy sources from the crust and mantle to the oceans. However, the biogeochemical processes involved in subseafloor hydrothermal circulation are not fully understood. This study investigated the compositional and isotopic properties of
Zhendong Luan, Hao Chen, Hao Wang, Zhang Xin, Lei Cao, Lianfu Li, Li Zhou, Li Chaolun, Minxiao Wang, Lian Chao, Huan Zhang   +10 more
openaire   +2 more sources

Hydrothermal circulation in subducting crust reduces subduction zone temperatures

Geology, 2008
Most thermal models of subduction zones assume no advection of heat by fluid flow because slow flow through underthrusting sediment, the decollement, and wedge likely transports only a minor amount of heat. We model coupled fluid and heat transport in a subduction zone and show that hydrothermal circulation in subducting basaltic basement rocks can ...
Glenn A. Spinelli, Troy Kummer
openaire   +1 more source

Influence of permeability on hydrothermal circulation in the sediment-buried oceanic crust

Science in China Series D, 2006
Hydrothermal convection in the upper oceanic crust has been inferred to be a common and important process. Under the simplified conditions of planar boundaries, permeability provides a strong constraint on the pattern of circulation, the dimensions of convective cells and flow field of hydrothermal circulation.
Wang Xing-tao, Yu Zenghui, Sun Ge, LI Huai-ming, Xue Gang, Meng Fanshun, Zhai Shikui   +6 more
openaire   +2 more sources

Observations concerning the vigor of hydrothermal circulation in young oceanic crust

Journal of Geophysical Research: Solid Earth, 1996
A detailed suite of seafloor heat flow measurements and seismic reflection profiles has been completed in a young (circa 1 Ma) area on the eastern flank of the Juan de Fuca Ridge that is characterized by unusually smooth basement topography and uniform sediment cover.
David S. Chapman, Earl E. Davis, Craig B. Forster   +2 more
openaire   +2 more sources