Results 41 to 50 of about 27,222 (235)

Mantle roots of the Emeishan plume: an evaluation based on teleseismic P-wave tomography [PDF]

Solid Earth, 2017
The voluminous magmatism associated with large igneous provinces (LIPs) is commonly correlated to upwelling plumes from the core–mantle boundary (CMB). Here we analyse seismic tomographic data from the Emeishan LIP in southwestern China.
C. He, M. Santosh, M. Santosh
doaj   +1 more source

Mantle Plumes and Their Interactions

, 2022
Hotspots are regions of intraplate volcanism or especially strong volcanism along plateboundaries, and many of them are likely caused by underlying mantle plumes – localizedhot upwellings from deep inside the Earth. It is still uncertain, whether all plumes or justsome of them rise from the lowermost mantle, and to what extent and where theyentrain ...
Steinberger, B., Steinberger, A.
openaire   +3 more sources

Influence of mantle plume on continental rift evolution: A case study of the East African rift system

Petroleum Research
Mantle plume is an essential component of the mantle convection system, and its influence on the geodynamics of continental rifts is of great significance for understanding the crust–mantle interaction.
Haixuan Xu, Jianghai Li, Lijie Wang, Xiaoyu Zhang, Bo Feng   +4 more
doaj   +1 more source

Formation and evolution of a metasomatized lithospheric root at the motionless Antarctic plate: the case of East Island, Crozet Archipelago (Indian Ocean) [PDF]

, 2016
Sitting atop the nearly stagnant Antarctic plate (ca. 6.46 mm/yr), the Crozet archipelago midway between Madagascar and Antarctica constitutes a region of unusually shallow (1543-1756 m below sea level) and thickened oceanic crust (10-16.5 km), high ...
Bellieni, Giuliano, Levresse, Gilles, Marzoli, Andrea, Meyzen, CHRISTINE MARIE   +3 more
core  

High-MgO lavas associated to CFB as indicators of plume-related thermochemical effects: the case of ultra-titaniferous picrite-basalt from the Northern Ethiopian-Yemeni plateau [PDF]

A comprehensive petrological and geochemical dataset is reported in order to define the thermo-compositional characteristics of Ti (Fe)-enriched picrite-basalt lavas (HT2, TiO2 3-7 wt%), erupted close to the axial zone of the inferred Afar mantle plume ...
Beccaluva, Luigi, Bianchini, Gianluca G., Ellam, Robert M., Natali, Claudio, Savo, Andrea, Siena, Franca, Stuart, Finlay M.   +6 more
core   +1 more source

Oxygen isotope geochemistry of the second HSDP core [PDF]

, 2003
Oxygen isotope ratios were measured in olivine phenocrysts (~1 mm diameter), olivine microphenocrysts (generally ~100–200 µm diameter), glass, and/or matrix from 89 samples collected from depths down to 3079.7 m in the second, and main, HSDP core (HSDP-2)
Eiler, John M., Kitchen, Nami E., Wang, Zhengrong   +2 more
core   +1 more source

Are mantle plumes adiabatic? [PDF]

Earth and Planetary Science Letters, 2001
Abstract The issue concerning the state of adiabaticity of mantle plumes has been examined in a cartesian two-dimensional box with an aspect-ratio of six. We have investigated in the quasi steady-state regime high Rayleigh number convection with both depth-dependent viscosity and thermal expansivity for both the Boussinesq and the extended Boussinesq
Ctirad Matyska, David A. Yuen
openaire   +1 more source

Neoarchean Arc Magmatism and Crust Recycling in the Northern Marginal Zone of the Limpopo Complex, Zimbabwe: New Insights From Zircon U‐Pb‐Hf Isotopes of a Charnockite Suite

Geological Journal, EarlyView.
Charnockites with 2691–2607 Ma magmatic ages from the NMZ show arc‐magmatic geochemical signatures. They correspond to the lower‐crustal equivalent of the Chilimanzi Suite Granite in the Zimbabwe Craton. Lu‐Hf isotopic data of magmatic zircons show negative εHf(t) values (−11.18 to −2.20) with TDMC ages of 3699–3158 Ma, suggesting their protolith ...
Toshiaki Tsunogae, Md. Sazzadur Rahman, Gao Pin, M. Santosh, Wataru Fujisaki, Sam Uthup, Prince Mandingaisa   +6 more
wiley   +1 more source

Large volcanic eruptions are mostly sourced above mobile basal mantle structures

Communications Earth & Environment
Most deep mantle plumes rise from hot basal mantle structures, creating large volcanic eruptions at Earth’s surface. In previous studies, mantle plumes were the implicit process connecting volcanic eruptions to hot basal mantle structures.
Annalise Cucchiaro, Nicolas Flament, Maëlis Arnould, Noel Cressie   +3 more
doaj   +1 more source

Glass in the submarine section of the HSDP2 drill core, Hilo, Hawaii [PDF]

, 2004
The Hawaii Scientific Drilling Project recovered ~3 km of basalt by coring into the flank of Mauna Kea volcano at Hilo, Hawaii. Rocks recovered from deeper than ~1 km were deposited below sea level and contain considerable fresh glass. We report electron
Baker, Michael, Garcia, Michael, Seaman, Caroline, Sherman, Sarah, Stolper, Edward   +4 more
core   +1 more source