Results 51 to 60 of about 126,508 (258)

Geodynamic Models of Melt Generation and Extraction at Mid-Ocean Ridges [PDF]

Oceanography, 2012
It is widely accepted that plate divergence at mid-ocean ridges drives mantle flow, mantle melting, and the formation of new oceanic crust. However, many of the details of this process remain obscure because of the inaccessibility of the mantle to direct
Patricia M. Gregg, Laura B. Hebert, Laurent G.J. Montési, Richard F. Katz   +3 more
doaj  

Chemical Heterogeneities along the South Atlantic Mid-Ocean-Ridge (5-11°S): Shallow or Deep Recycling of Ocean Crust? [PDF]

, 2011
Between 5° and 11°S, the Mid-Atlantic Ridge displays anomalous crustal thickness and geochemical compositions, thought to be related to either small scale upper mantle heterogeneities or a weak, diffuse mantle plume.
Garbe-Schönberg, Dieter, Haase, K., Hauff, Folkmar, Hoernle, Kaj, Kokfelt, Thomas, Werner, Reinhard   +5 more
core  

Comparing the Last Interglacial (MIS 5e) with the present interglacial period (MIS 1) using a multidimensional functional diversity analysis: The marine molluscs from Santa Maria Island (Azores Archipelago, central Atlantic) as a case study

Journal of Quaternary Science, EarlyView.
ABSTRACT Marine fossil records hold outstanding importance for ecological, evolutionary and biogeographical studies. Santa Maria Island in the Azores Archipelago (central Atlantic) features a remarkable marine fossil record spanning from the Pliocene to recent times.
Sérgio P. Ávila, Samuel Arruda, Luís Silva, Ana Hipólito, Rui Quartau, Ricardo S. Ramalho, Patrícia Madeira, Carlos S. Melo, Lara Baptista, Ana Cristina Rebelo, Gustavo M. Martins, Gonçalo Castela Ávila, Mohamed Amine Doukani, Esther Martín‐González, Daniele Scarponi, Alfred Uchman, Markes Johnson   +16 more
wiley   +1 more source

Changes in water mass composition and circulation in the central Arctic Ocean between 2011 and 2021 inferred from tracer observations [PDF]

Ocean Science
The Arctic Ocean is changing rapidly and Atlantic Water circulation plays a key role in the warming, sea-ice decline, and ecosystem changes observed in the Arctic.
A.-M. Wefing, A.-M. Wefing, A. Payne, M. Scheiwiller, C. Vockenhuber, C. Vockenhuber, M. Christl, T. Tanhua, N. Casacuberta, N. Casacuberta   +9 more
doaj   +1 more source

Global variation of seismic energy release with oceanic lithosphere age

Scientific Reports, 2021
Variations in Mid Ocean Ridge seismicity with age provide a new tool to understand the thermal evolution of the oceanic lithosphere. The sum of seismic energy released by earthquakes during a time, and for an area, is proportional to its lithospheric age.
Nicolás Pinzón, Carlos A. Vargas
doaj   +1 more source

Seamounts and oceanic igneous features in the NE Atlantic: a link between plate motions and mantle dynamics [PDF]

, 2016
A new regional compilation of seamount-like oceanic igneous features (SOIFs) in the NE Atlantic points to three distinct oceanic areas of abundant seamount clusters.
Blischke, Anett, Erlendsson, Ögmundur, Gaina, Carmen, Geissler, Wolfram H., Kimbell, Geoffrey S.   +4 more
core   +3 more sources

Development of a moored radium in situ sampler to measure annual time series

Limnology and Oceanography: Methods, EarlyView.
Abstract Radium is a useful tracer of sediment‐derived materials, improving our understanding of the geochemical cycling of elements at ocean boundaries. We have developed an autonomous in situ sampler to collect time series samples of radium isotopes on mooring deployments.
Lauren Kipp, Matthew A. Charette, Paul Henderson, Joshua Benedict, Igor Polyakov, Andrey Pnyushkov   +5 more
wiley   +1 more source

Water-rich basalts at mid-ocean-ridge cold spots [PDF]

, 2004
Although water is only present in trace amounts in the suboceanic upper mantle, it is thought to play a significant role in affecting mantle viscosity, melting and the generation of crust at mid-ocean ridges. The concentration of water in oceanic basalts
Bonatti, Enrico, Cipriani, Anna, Ligi, Marco, Ottolini, Luisa   +3 more
core   +2 more sources

The IceShark, an effective method for sampling plankton under sea ice

Limnology and Oceanography: Methods, EarlyView.
Abstract Seasonal sea ice plays a crucial role in shaping coastal ecosystem dynamics throughout the circumpolar region. Of particular interest to oceanographers is the ice‐ocean interface which functions as a multidimensional habitat, supporting both sympagic algae and pelagic phytoplankton in the under‐ice surface waters.
Eleanor A. Barry, Susan Ziegler, Joey Angnatok, Emma J. Harrison, Uta Passow   +4 more
wiley   +1 more source

Spatial Variations in the Degree of Upper‐Mantle Depletion in a Mid‐Ocean Ridge–Transform Fault System

Geochemistry, Geophysics, Geosystems
Partial melting beneath a mid‐ocean ridge creates a chemically depleted layer in the uppermost mantle. This chemical depletion lowers the density of the lithosphere compared with the unmelted mantle.
M. Morishige
doaj   +1 more source