Results 51 to 60 of about 9,158 (119)

Impact of Mantle Velocity Uncertainty on Receiver‐Function Imaging of the Transition Zone

Geophysical Research Letters
Seismological estimates of the 400‐km and 670‐km mantle discontinuities (d400 and d670) are crucial for understanding the thermochemical structure and dynamics of the mantle transition zone (MTZ).
Carlos A. M. Chaves, Felipe P. Corral, Jeroen Ritsema   +2 more
doaj   +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

A global mantle xenolith bulk-rock and paired-mineral dataset

Scientific Data
This data descriptor presents a globally compiled dataset of major element concentrations for mantle peridotite and pyroxenite xenoliths. The dataset includes whole-rock analyses, constituent mineral compositions, manually collated sample ages, and ...
Ben Qin, Tao Sun, Litong Li, Dongya Zou
doaj   +1 more source

Lithospheric Mantle Heterogeneity Drives Delayed Magmatism and Wide Continent‐Ocean Transitions in Rifted Margins

Geophysical Research Letters
The formation of wide, magma‐starved continent–ocean transition (COT) zones remains incompletely understood. We use 2‐D thermo‐mechanical numerical experiments, coupling hydrous mantle melting with parameterized crustal accretion, to explore controls on ...
Yuan Wang, Zhonglan Liu
doaj   +1 more source

Open- versus closed-system magmatism on Mars revealed by shergottites

Communications Earth & Environment
The origin of depleted, intermediate, and enriched geochemical reservoirs on Mars has long been debated, with competing models invoking mantle heterogeneity versus crustal contributions.
Chad J. Peel, Geoffrey H. Howarth, Gelu Costin, Olivier Alard, Stephen Foley   +4 more
doaj   +1 more source

Plume‐Modified Lithosphere Mantle Controlled the Cenozoic Sediment Thickness in the Tarim Basin

Geophysical Research Letters
The Cenozoic sediments are very thick in the southwest Tarim Basin and very thin in the northwest, but what controls these variations is unclear.
Xiao Xiang, Hanlin Chen, Lin Chen, Xi Xu, Xiubin Lin, Zhong Li, Zhiyong Yan   +6 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

Helium Isotope Variations in Gulf of Aden Basalts and the Surface Expression of Mantle Heterogeneity During Afar Plume—Triple Junction Interaction

Geochemistry, Geophysics, Geosystems
New helium isotope data for basalt glasses from the Gulf of Tadjoura and Gulf of Aden reveal a mantle plume signal that has 3He/4He up to 17 RA. In the Gulf of Aden, plume helium is detectable ∼380 km from the Afar triple junction, up to the Shukra El ...
D. W. Graham, P. J. Michael
doaj   +1 more source