Results 41 to 50 of about 31,106 (253)

Temperatures in ambient mantle and plumes: Constraints from basalts, picrites, and komatiites [PDF]

, 2006
Several methods have been developed to assess the thermal state of the mantle below oceanic ridges, islands, and plateaus, on the basis of the petrology and geochemistry of erupted lavas. One leads to the conclusion that mantle potential temperature (i.e.
Lesher, C. M., P. D. Asimow (4380079), Niu, Yaoling, A. D. Saunders (7585886), Lesher, C.M., Arndt, N., Herzberg, C., C. Herzberg (10061344), Fitton, J.G., Fitton, J. G., Asimow, Paul D., Y. L. Niu (10061347), C. M. Lesher (7733825), Asimow, P.D., J. G. Fitton (7585871), Saunders, A.D., Saunders, A. D., Arndt, Nicholas, N. Arndt (8870258), Michael Cheadle (10060309), Cheadle, M. J., Cheadle, M.J., Niu, Y. L., Niu, Y., Asimow, P. D., Cheadle, Michael   +25 more
core   +1 more source

Late Pleistocene Volcanic Rocks From Tengchong Volcanic Field at SE Tibetan Plateau: Constraints on Petrogenesis and Mantle and Crustal Processes

Geological Journal, EarlyView.
Early zircon saturation and crystallisation occur in mafic (52–54 wt.% SiO2) lavas at Tengchong volcanic field. These early formed zircons with high δ18O (6.6‰–7.9‰) indicates mantle enrichment by subducted supracrustal materials. ABSTRACT Late Pleistocene (< 0.2 Ma) mafic and evolved volcanic rocks occur in northern Tengchong Volcanic Field, SE ...
Lizhu Wang, Haibo Zou
wiley   +1 more source

The influence of mid-ocean ridges on euphausiid and pelagic ecology

, 2012
Chapters 1 & 2. Euphausiids comprise a major component of ecosystems in the pelagic realm, the world’s largest habitat, but basin scale drivers of euphausiids diversity and abundance are poorly understood. Mid-Ocean Ridges are the largest topographical
Letessier, Tom Bech
core   +1 more source

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  

Alaskan Ridge Blocking and Associated Winter Cold Conditions Over North America

International Journal of Climatology, EarlyView.
Multi‐decadal (1979–2023) analysis reveals that wintertime reductions in the meridional gradient of potential vorticity (PVy) over the Bering Sea are recurrent but episodic features of North Pacific circulation. These suppressed PVy states consistently co‐occur with amplified Alaskan ridging, weakened mid‐tropospheric westerlies and a downstream warm ...
Varunesh Chandra, James E. Overland, Muyin Wang   +2 more
wiley   +1 more source

Petrogenesis of lavas from Detroit Seamount: Geochemical differences between Emperor Chain and Hawaiian volcanoes [PDF]

, 2005
The Hawaiian Ridge and Emperor Seamount Chain define a hot spot track that provides an 80 Myr record of Hawaiian magmatism. Detroit Seamount (∼76 to 81 Ma) is one of the oldest Emperor Seamounts.
S. Huang, Frey, F., M. Regelous, F. A. Frey, Huang, S., Regelous, M., Frey, F. A., T. Thordarson, Thordarson, T.   +8 more
core   +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

Non‐Stationary Dry‐Spell Hazard Probabilities for Spain

International Journal of Climatology, EarlyView.
This study assesses long‐term changes in dry‐spell hazard probabilities across Spain (1961–2024) using a novel non‐stationary extreme value framework applied to daily precipitation records from a dense observational network. Results show that dry‐spell duration and associated return levels are dominantly stationary, with non‐stationary models providing
S. M. Vicente‐Serrano, S. Beguería, A. Royo, A. El Kenawy, M. Franquesa, A. Halifa‐Marin, M. Adell‐Michavila, A. Crespillo, D. Pérez‐Pajuelo, F. Domínguez‐Castro, C. Azorin‐Molina, L. Gimeno, R. Nieto, L. Gimeno‐Sotelo   +13 more
wiley   +1 more source

Crustal accretionary processes at mid-ocean ridges - Valu Fa Ridge, Lau Basin [PDF]

, 1998
The structure of oceanic crust is surprisingly uniform, which suggests that crustal accretionary processes at mid-ocean ridges must be broadly similar, despite their different spreading rates and seafloor morphologies.
Turner, Ian mark
core