Results 51 to 60 of about 449 (169)

Origin of Alkaline Basaltic Intrusive Rocks in an Exhumed Accretionary Complex: Implications for Past Petit‐Spot Volcanism in the Ocean

Geochemistry, Geophysics, Geosystems, 2023
Accreted basaltic rocks are expected to provide information on intraplate volcanism in the oceans. Basaltic rocks, originating from mid‐ocean ridges, plateaus, and seamounts, have been reported from exhumed accretionary complexes. However, basaltic rocks
Ginta Motohashi, Takashi Sano, Kohtaro Ujiie, Madison Frank   +3 more
doaj   +1 more source

Hydrogen‐Enhanced Grain Boundary Conductivity Explains High‐Conductivity Anomalies in Trans‐Lithospheric Shear Zones

Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.
Abstract Magnetotelluric (MT) surveys reveal high electrical conductivity anomalies along major trans‐lithospheric shear zones. Given that trans‐lithospheric shear zones are proposed conduits for deep‐Earth volatiles, we employ molecular dynamics simulations to quantify H+ diffusivity and electrical conductivity at olivine grain boundaries.
Haoqing Wang, Kui Han, Chuanyu Zhang, Xiaofeng Tian, Xuben Wang, Simon Martin Clark   +5 more
wiley   +1 more source

Thick Underplating and Buoyancy of the Bermuda Swell

Geophysical Research Letters
Bermuda is an intraplate ocean swell that does not conform to traditional mantle plume theory. Unlike other prominent bathymetric swells, such as Hawaii, it lacks age‐progressive volcanism, a deeply rooted mantle plume, and modern volcanism.
William D. Frazer, Jeffrey Park
doaj   +1 more source

Pliocene adakite-like accent of andesites and dacites from the Orlov volcanic field (Sakhalin Island)

Геосистемы переходных зон, 2021
Adakite-like geochemical signature (high Sr/Y ratio at a low Y concentration) is recognized in andesites and dacites, associated with intraplate basalts in the Orlov volcanic field of Sakhalin Island.
Sergei V. Rasskazov, Alexander V. Rybin, Artem V. Degterev, Irina S. Chuvashova, Tatyana A. Yasnygina, Elena V. Saranina   +5 more
doaj   +1 more source

Hafnium isotopic variations in East Atlantic intraplate volcanism [PDF]

Contributions to Mineralogy and Petrology, 2010
The broad belt of intraplate volcanism in the East Atlantic between 25° and 37° N is proposed to have formed by two adjacent hotspot tracks (the Madeira and Canary tracks) that possess systematically different isotopic signatures reflecting different mantle source compositions.
Geldmacher, Jörg, Hoernle, Kaj A., Hanan, Barry, Blichert-Toft, Janne, Hauff, Folkmar, Gill, James B., Schmincke, Hans-Ulrich   +6 more
openaire   +3 more sources

Bayesian Modeling of Crustal Azimuthal Anisotropy Supports Partial Crust–Mantle Anisotropic Decoupling in a Continental Back‐Arc, Northeast China

Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.
Abstract How crustal deformation responds to complex mantle flow in continental back‐arc settings remains poorly constrained. Here, we develop a Bayesian working‐likelihood approach to estimate crust‐averaged azimuthal anisotropy from P‐wave receiver functions. The method separates crust‐averaged velocity anisotropy from dip‐related apparent anisotropy
Chunsen Li, Xiao Xu, Xiaoyu Guo, Xiaofei Tong, Hengcheng Ying, Lingyan Li   +5 more
wiley   +1 more source

Low-velocity anomaly in the Coral Sea associated with subducting slabs and the Woodlark rift

Communications Earth & Environment
Classical plume models offer insights into intraplate volcanism and seamount chain formation by assuming a cylindrical upwelling of hot materials from the core-mantle boundary.
Ji-hoon Park, Sung-Joon Chang
doaj   +1 more source

The Geochemistry of the Arabian Lithospheric Mantle--a Source for Intraplate Volcanism? [PDF]

Journal of Petrology, 2007
DANISH LITHOSPHERE CENTRE, STER VOLDGADE 10, COPENHAGEN, 1350K, DENMARK DEPARTMENT OF GEOLOGY, ROYAL HOLLOWAY UNIVERSITY OF LONDON, EGHAM TW20 0EX, UK SCHOOL OF EARTH SCIENCES, VICTORIA UNIVERSITY OF WELLINGTON, PO BOX 600, WELLINGTON, NEW ZEALAND DEPARTMENT OF EARTH SCIENCES, OREGON STATE UNIVERSITY, CORVALLIS, OR97331-5506, USA DEPARTMENT OF EARTH ...
J. E. Shaw, J. A. Baker, A. J. R. Kent, K. M. Ibrahim, M. A. Menzies   +4 more
openaire   +1 more source

Tracing Continental Basalt Sources and Mantle Processes Using Fe Stable Isotopes

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 8, August 2026.
Abstract Iron (Fe) isotopes have emerged as powerful tracers of mantle source heterogeneity and melting processes, yet the mechanisms producing heavy Fe isotope signatures (high δ57Fe values) in intraplate basalts remain debated. Competing interpretations include partial melting of recycled pyroxenite domains versus carbonate‐induced oxidation of a ...
Yi‐Shan Cheng, Jian‐Qiang Liu, Li‐Hui Chen, Xun Yu, Gang Zeng, Xiao‐Jun Wang, Zhao‐Yang He, Jian Zhao, Frances M. Deegan, Valentin R. Troll, Hong‐Fu Zhang   +10 more
wiley   +1 more source

Intraplate Lithospheric Deformation Forms Large Volcanic Regions

, 2023
Large igneous systems form either in areas of thin lithosphere at or near plate boundaries or by mantle-melting anomalies in intraplate settings with comparatively thicker lithosphere. Decompression melting or flux melt dominate at plate boundaries. Intraplate magmatism relates to thermal or compositional anomaly in the mantle.
César R. Ranero, Laura Gomez de la Peña, Manel Prada, Estela Jimenez, Patricia Cadenas, Alejandra Neri, Irene Merino, Arantza Ugalde, Ingo Grevemeyer   +8 more
openaire   +2 more sources