ocean ridge
A 65 k.y. time series from sediment-hosted glasses reveals rapid transitions in ocean ridge magmas
... of ocean ridge magmatism have been hampered by the difficulty in constructing time-series data over more than a few thousand ...formed ocean crust, and older rocks, even when recovered from fault ...
10
3‐D Seismic Investigation of a Gas Hydrate and Fluid Flow System on an Active Mid‐Ocean Ridge; Svyatogor Ridge, Fram Strait
... Svyatogor Ridge setting may be confounded by two additional fac- tors: (1) the location proximal to a strike-slip tectonic setting could be influencing the tectonic setting and (2) it is difficult to determine what ...
18
The boron and lithium isotopic composition of mid ocean ridge basalts and the mantle
... Fig. 6 Mean lithium isotopic compositions and Li concentrations of mid-ocean ridge sections, excluding high-Cl/K samples. Error bars are 2SD. The EPR 9.5 ◦ N samples are subdivided into two groups with ...
59
Numerical simulations of mid ocean ridge hydrothermal circulation including the phase separation of seawater
... Around mid-ocean ridges, seawater sinks through cracks of oceanic crusts and flows out near the crests, being driven by the heat of underlying cooling magma chambers. The out- flowing hot water forms spectacular ...
23
Does presence of a mid ocean ridge enhance biomass and biodiversity?
... open ocean, nutrient concentrations in surface layers are restricted and a significant fraction of surface primary production is exported downward into the ocean interior, gradually attenuated with depth, ...
10
Equation of state of molten mid-ocean ridge basalt. Structure of Kilauea volcano.
... Basalts are the most ubiquitous rocks erupting at the earth's surface at the present time and they provide an important probe of the subsurface processes occurring within[r] ...
233
The crystallisation history of normal mid ocean ridge basalts from the Eastern Pacific Ocean and implications for the composition of primary mid ocean ridge magmas : evidence from mineralogy, pillow rim glasses and melt inclusion studies
... McNeill A. W. and Danyushevsky, L.V.(1996) Composition and crystallisation temperatures of primary melts from Hole 896A basalts: evidence from melt inclusion studies. In Proc. ODP ScL Results, Vol. 148 (ed. J. Alt, H. ...
275
Platinum-group elements, S, Se and Cu in highly depleted abyssal peridotites from the Mid-Atlantic Ocean Ridge (ODP Hole 1274A): Influence of hydrothermal and magmatic processes
... basis) from Harvey et al. (2006). Symbols as in figure 3. The grey star shows the PUM composition of McDonough and Sun (1995) and the white box its variability inferred by Becker et al. (2006). Melting is modelled using ...
39
PETROGENESIS AND ORIGIN OF THE CHENAR GRANITOID STOCK, NW OF KERMAN, IRAN: EVIDENCE OF NEOTETHYS SUBDUCTION RELATED ARC MAGMATISM
... and ocean ridge granite normalized multi-element diagrams indicate that the Chenar granitoid stock has characteristics of metaluminous to slightly peraluminous, calc-alkaline, I-type granite of a volcanic ...
11
Rock Ages on the Ocean Floor
... the ocean floor intensified, and within a few years, a curious terrain had emerged: vast, flat plains interrupted by ridges, or more precisely, vast mountain ...Atlantic Ocean, the “ridge” is about ...
5
Late Neoarchean subduction related crustal growth in the Northern Liaoning region of the North China Craton : evidence from ∼2 55 2 50 Ga granitoid gneisses
... A Neoarchean mid-ocean ridge magmatism at or prior to ~2570 Ma, generating N-MORB-like basaltic rocks; B Incipient subduction of oceanic slabs and evolution of an intra-oceanic arc syste[r] ...
87
Heat and fluid flow simulations in submarine volcanic terrains and implications for the formation of massive sulfide deposits
... 21 Fontaine, F.J., Rabinowicz, M., and Boulegue, J., 2001, Permeability changes due to mineral diagenesis in fractured crust: implications for hydrothermal circulation at mid-ocean ridge[r] ...
65
GEOCHEMICAL AND PETROLOGICAL CHARACTERISTICS OF DEH SIAHAN GRANITIC ROCKS, SOUTHWEST OF KERMAN, IRAN: DATA BEARING ON GENESIS
... and ocean ridge granite normalized multi- element diagrams indicate that the Deh Siahan granitic rocks have characteristics of high-K, calc-alkaline, I-Cordilleran type granites of volcanic arc ...
10
Dynamical geochemistry of the mantle
... mid-ocean ridge, extracts mafic material from the mantle, and subduction then returns that material to be stirred into the ...mid-ocean ridge, will recir- culate ...
31
Cruise Report: CD149 – RRS Charles Darwin 18th July to 6th August, 2003 Spreading ridge geometry, hydrothermal activity, and the influence of modern and ancient hotspots on the Carlsberg Ridge northwestern Indian Ocean
... Carlsberg Ridge was almost unknown, with only two or three poorly located rock samples, no continuous bathymetry, only a few single-track geophysics lines and no exploration for hydrothermal ...the ridge is ...
37
Tectonic settings of continental crust formation : insights from Pb isotopes in feldspar inclusions in zircon
... using the Pb isotope composition of detrital K-feldspar: Chemical Geology v.. composition of ocean ridge basalts: Geochemistry, Geophysics, Geosystems, v.[r] ...
18
Structure of the Earth - Intro. to Plate Tectonics
... • Oldest sea floor away from mid-ocean ridge.. Evidence for Seafloor Spreading. Evidence for Seafloor Spreading[r] ...
63
A record of spontaneous subduction initiation in the Izu–Bonin–Mariana arc
... assumed ages of the current major subduction systems bordering the Pacific and along the Alpine- Himalayan Zone, McKenzie 2 suggested Òridges start easily, but trenches do not.Ó Ignorance of subduction inception ...
14
Trace Metals Distribution in Sulfide Minerals of the Ultramafic-Hosted Hydrothermal Systems: Example from the Kairei Vent Field, Central Indian Ridge
... Pyrite from the ultramafic-hosted Kairei, Logatchev and Semyenov-1 has higher concentrations of Au (> 1 ppm on average) than those from the mafic-hosted Wocan, MESO, TAG, Turtle Pits and MAR 5°S (Au <1 ppm) along ...
34
Multibiometeric System for New Born Recognition
... the ridge endings and the ridge bifurcations a ridge ending is the point, where a ridge ends ...A ridge bifurcation is the point, where a ridge forks into a branch ridge ...
5