Results 51 to 60 of about 1,707 (195)

Narrow, Fast, and “Cool” Mantle Plumes Caused by Strain‐Weakening Rheology in Earth's Lower Mantle

Geochemistry, Geophysics, Geosystems, 2022
The rheological properties of Earth's lower mantle are key for mantle dynamics and planetary evolution. The main rock‐forming minerals in the lower mantle are bridgmanite (Br) and smaller amounts of ferropericlase (Fp).
A. J. P. Gülcher, G. J. Golabek, M. Thielmann, M. D. Ballmer, P. J. Tackley   +4 more
doaj   +1 more source

The constant oxidation state of Earth’s mantle since the Hadean

Nature Communications
Determining the evolutionary history of mantle oxygen fugacity (fo2) is crucial, as it controls the fo2 of mantle-derived melts and regulates atmospheric composition through volcanic outgassing. However, the evolution of mantle fo2 remains controversial.
Fangyi Zhang, Vincenzo Stagno, Lipeng Zhang, Chen Chen, Haiyang Liu, Congying Li, Weidong Sun   +6 more
doaj   +1 more source

Geochronological results from the Zhela Formation volcanics of the Tethyan Himalaya and their implications for the breakup of eastern Gondwana

Scientific Reports, 2023
The relationship between the Kerguelen mantle plume and the breakup of eastern Gondwana is still debated. The new Zircon SHRIMP U–Pb dating of 139.9 ± 4.6 Ma, as well as previous ages from the Zhela Formation volcanic rocks in the Tethyan Himalaya, show ...
Jiacheng Liang, Weiwei Bian, Xianwei Jiao, Wenxiao Peng, Jiahui Ma, Suo Wang, Yiming Ma, Shihong Zhang, Huaichun Wu, Haiyan Li, Yuruo Shi, Tianshui Yang   +11 more
doaj   +1 more source

A Synoptic View of Mantle Plume Shapes Enabled by Virtual Reality

Geochemistry, Geophysics, Geosystems
The shapes of mantle plumes are sensitive to mantle viscosity, density structure, and flow patterns. Increasingly, global tomographic models reveal broad plume conduits in the lower mantle and highly tilting conduits in the mid and upper mantle. Previous
Qianyi Lu, Maxwell L. Rudolph
doaj   +1 more source

A case for mantle plumes

Chinese Science Bulletin, 2005
The existence of at least several plumes in the Earth’s mantle can be inferred with few assumptions from wellestablished observations. As well, thermal mantle plumes can be predicted from wellestablished and quantified fluid dynamics and a plausible assumption about the Earth’s early thermal state.
openaire   +2 more sources

Mantle Potential Temperature Estimates and Primary Melt Compositions of the Low-Ti Emeishan Flood Basalt

Frontiers in Earth Science, 2018
The Late Permian Emeishan large igneous province (ELIP) is considered to be one of the best examples of a mantle plume derived large igneous province. One of the primary observations that favor a mantle plume regime is the presence of ultramafic volcanic
J. G. Shellnutt, Thuy T. Pham
doaj   +1 more source

Plume–Lithosphere Interaction and the Role of the Mid‐Lithospheric Discontinuity in Craton Delamination

Geophysical Research Letters
We present results from thermo‐mechanical numerical modeling of interactions between thermal, thermo‐compositional, and purely compositional (hydrous) mantle plumes, and a rheologically layered lithosphere containing a mid‐lithospheric discontinuity (MLD)
Alessio Lavecchia, István Kovács, Alexander Koptev, Sierd Cloetingh   +3 more
doaj   +1 more source

On the relative motions of long-lived Pacific mantle plumes

Nature Communications, 2018
Using mantle plumes to reconstruct past plate motion is complicated, because plumes may not be fixed. Here, the authors demonstrate using 40Ar/39Ar ages that the Rurutu plume is relatively stable compared to the rapidly moving Hawaiian plume, yet it has ...
Kevin Konrad, Anthony A. P. Koppers, Bernhard Steinberger, Valerie A. Finlayson, Jasper G. Konter, Matthew G. Jackson   +5 more
doaj   +1 more source

The Probability of Mantle Plumes in Global Tomographic Models

Geochemistry, Geophysics, Geosystems, 2020
While the downward mass flux in the Earth's deep interior is well constrained by seismic tomography, the upward flux is still poorly understood and debated.
Augustin Marignier, Ana M. G. Ferreira, Thomas Kitching   +2 more
doaj   +1 more source

Gas Measurements Reveal Fractional Degassing and Water Interaction During a Flank Eruption of Pacaya Volcano (Guatemala)

Geophysical Research Letters, Volume 53, Issue 17, 16 September 2026.
Abstract SO2 flux and gas composition were measured during the 2021 flank eruption of Pacaya Volcano (Guatemala). The SO2 flux, measured with Tropomi, gradually rose from ∼2 to ∼30 kg/s over a 5 month period before the eruption. Field UV camera data showed that >95% of the SO2 was emitted from the summit crater.
Robin Campion, Ali Zare, Sébastien Valade, Denis Legrand, Gustavo Chigna, Yves Moussallam   +5 more
wiley   +1 more source