Results 91 to 100 of about 45,633 (206)

Heterogeneity in the mantle [PDF]

Astronomy & Geophysics, 2004
openaire   +1 more source

A dynamic model of Venus's gravity field [PDF]

Unlike Earth, long wavelength gravity anomalies and topography correlate well on Venus. Venus's admittance curve from spherical harmonic degree 2 to 18 is inconsistent with either Airy or Pratt isostasy, but is consistent with dynamic support from mantle
Bills, B. G., Hager, B. H., Kiefer, W. S., Richards, M. A.   +3 more
core   +1 more source

Extreme Mantle Heterogeneity Revealed by Geochemical Investigation of In Situ Lavas at the Central Mohns Ridge, Arctic Mid‐Ocean Ridges

Geochemistry, Geophysics, Geosystems
Mid‐ocean ridge basalts reflect the mantle’s composition and reveal processes from melting to eruption. The Mohns and Knipovich Ridges have ultraslow spreading rates, low magma budgets and erupted lavas indicating various mantle domains.
Håvard Hallås Stubseid, Anders Bjerga, Leif‐Erik Rydland Pedersen, Rolf Birger Pedersen   +3 more
doaj   +1 more source

Mantle dynamics and petrogenesis of Gomer basalts in the Northwestern Ethiopia: A geochemical perspective

Open Geosciences
This study investigates the petrological and geochemical characteristics of basalts from the Gomer area in the Northwestern Ethiopian Volcanic Province to explore their petrogenesis and mantle source characteristics.
Wondem Habtamu, Teferi Minyahl, Jothimani Muralitharan, Wondem Demeke   +3 more
doaj   +1 more source

A Magnetotelluric Study of Mantle Heterogeneities Beneath the Northeastern United States

Geochemistry, Geophysics, Geosystems
Analysis of magnetotelluric (MT) data across the northern Appalachian region reveals significant mantle heterogeneity. By inverting a subset of long‐period EarthScope USArray MT data, we constructed a three‐dimensional electrical resistivity model that ...
Jae Deok Kim, Rob. L. Evans
doaj   +1 more source

Driving forces: Slab subduction and mantle convection [PDF]

Mantle convection is the mechanism ultimately responsible for most geological activity at Earth's surface. To zeroth order, the lithosphere is the cold outer thermal boundary layer of the convecting mantle.
Hager, Bradford H.
core   +1 more source

Intraslab stress heterogeneity and continental mantle faulting revealed by the 2006 Pingtung offshore earthquake doublet

Communications Earth & Environment
The impact of lithospheric rheology and subduction dynamics on intraslab stress and earthquake characteristics, as well as the cause of the scarcity of continental mantle earthquakes remain debated.
Wan-Lin Hu, Eh Tan, Ryo Okuwaki, Yuji Yagi   +3 more
doaj   +1 more source

The Influence of Rotation on the Preservation of Heterogeneities in Magma Oceans

Geochemistry, Geophysics, Geosystems
Understanding the composition of lavas erupted at the surface of the Earth is key to reconstruct the long‐term history of our planet. Recent geochemical analyses of ocean island basalt samples indicate the preservation of ancient mantle heterogeneities ...
B. Thomas, H. Samuel, C. G. Farnetani, J. Aubert, C. Chauvel   +4 more
doaj   +1 more source

Mantle Convection with Active Chemical Heterogeneities

, 1989
The main source of mantle heterogeneity is the subduction of basaltic oceanic crust. Whether or not coherent lumps of continental crust are recycled in significant amounts is unkown. These heterogeneities will — at least in parts — be torn into progessively longer and thinner streaks (or schlieren, tendrils, bands, lamellae), giving rise to a “marble ...
openaire   +2 more sources

Distinct Hadean Mantle Sources of Felsic and Mafic Terranes Juxtaposed in the Paleoarchean

Geochemistry, Geophysics, Geosystems
The short‐lived radionuclide system 146Sm‐142Nd can provide direct information about geological differentiation events in the terrestrial Hadean (>4.0 Ga) mantle.
Arathy Ravindran, Bradley J. Peters, Klaus Mezger, Eric Hasenstab‐Dübeler, Maya J. M., Maria Schönbächler   +5 more
doaj   +1 more source