Results 81 to 90 of about 24,088 (309)

Carbonatite metasomatism overprinted by silicate melt metasomatism in the mantle beneath the West Eifel volcanic field [PDF]

European Journal of Mineralogy
The texture and mineral compositions of mantle xenoliths from the West Eifel volcanic field (WEVF) reveal three distinct mantle events. The first, identified in LREE-depleted and isotopically depleted anhydrous (type Ib) xenoliths, resulted from partial ...
B. E. Bromley, S. Ma, S. Ma, C. S. J. Shaw   +3 more
doaj   +1 more source

A Quartz-bearing Orthopyroxene-rich Websterite Xenolith from the Pannonian Basin, Western Hungary: Evidence for Release of Quartz-saturated Melts from a Subducted Slab [PDF]

, 2017
An unusual quartz-bearing orthopyroxene-rich websterite xenolith has been found in an alkali basaltic tuff at Szigliget, Bakony-Balaton Highland Volcanic Field (BBHVF), western Hungary. Ortho- and clinopyroxenes are enriched in light rare earth elements (
Bali, E., Bodnar, R. J., Halter, W., Kovács, I., Szabó, CS, Török, K., Vaselli, O., Zajacz, Z.   +7 more
core  

Are Estimates of Lower Continental Crust Bulk Composition Biased Due to Seismic Anisotropy?

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 5, May 2026.
Abstract Most seismic inferences on the bulk composition of the lower continental crust are based on P‐wave velocities inferred from seismic wide‐angle data, for which the direction of propagation in the target region is sub‐horizontal. Given the likely presence of anisotropy in many parts of the lower continental crust, these estimates could be biased
Zheng Luo, Othmar Müntener, György Hetényi, Klaus Holliger   +3 more
wiley   +1 more source

Microstructural and geochemical constraints on the evolution of deep arc lithosphere [PDF]

, 2016
Mantle xenoliths from the Sierra Nevada, California, USA, sampled a vertical column (60–120 km) of lithosphere that formed during Mesozoic continental arc magmatism. This lithosphere experienced an anticlockwise P-T-t path resulting in rapid cooling that
Chin, Emily J., Eiler, John M., Hirth, Greg, Kruckenberg, Seth C., Saal, Alberto E., Soustelle, Vincent   +5 more
core   +2 more sources

Quantitative Assessment of Peridotite Tectonomagmatic Affinities Using Compositional Data Analysis and Explainable Machine Learning

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 5, May 2026.
Abstract Peridotites record the compositional evolution of the lithospheric and asthenospheric mantle across plume‐related lithospheres, convergent margins, and rift‐related volcanic environments; however, their tectonomagmatic affinities are commonly difficult to resolve using traditional low‐dimensional geochemical discrimination diagrams.
Swarnendu Roy, Koushik Sen
wiley   +1 more source

Chemical Geodynamics of Granitoid Magmatism During a Pacific‐Philippine Sea Plate Transition in Southwest Japan

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 5, May 2026.
Abstract Granitoid magmatism along the western Pacific margin records interactions between subduction dynamics and crust–mantle processes; however, the links between plate reorganization and magma‐source evolution remain debated. Here we integrate U–Pb zircon geochronology with Pb–Sr–Nd–Hf isotope systematics to investigate Cretaceous–Paleogene ...
Nghiem V. Dao, Tsegereda A. Yemer, Tulibako T. Mwaisuba, Chie Sakaguchi, Hiroshi Kitagawa, Katsura Kobayashi, Teruyoshi Imaoka, Eizo Nakamura   +7 more
wiley   +1 more source

The Moho as a magnetic boundary [PDF]

Magnetic data are presented for mantle derived rocks: peridtites from St. Pauls rocks, dunite xenoliths from the kaupulehu flow in Hawaii, as well as peridolite, dunite and eclogite xenoliths from Roberts Victor, Dutoitspan, Kilbourne Hole, and San ...
Mayhew, M. A., Thomas, H. H., Wasilewski, P. J.   +2 more
core   +1 more source

Metasomatism and Melting of Cordilleran Lithosphere Resulting From Sediment Relamination During Shallow Subduction

Geochemistry, Geophysics, Geosystems
Mantle xenoliths recovered from the modern backarc region of the northern Altiplano Plateau record metasomatism by slab‐derived silicic melts, and a suite of Quaternary volcanics suggest that melting of accreted crustal material has persisted since ...
C. D. Hiett, D. L. Newell, J. W. Shervais   +2 more
doaj   +1 more source

CARBONIFEROUS 40Ar/39Ar AGE OF THE RARE METAL-ENRICHED RHYOLITES AND IGNIMBRITES IN THE SAKMARA ALLOCHTHON OF THE SOUTHERN URALS, THEIR GEOCHEMICAL FEATURES AND GEODYNAMIC SETTING

Известия высших учебных заведений: Геология и разведка, 2018
In the structure of the Sakmara allochthon of the Southern Uralssequence with rhyolites and ignimbrites locally occures. They have Nb-Zr-REE geochemical specialization.
A. V. Ryazantsev, A. V. Pilitsina, I. A. Novikov, K. E. Degtyarev   +3 more
doaj   +1 more source

Shoshonitic enclaves in the high Sr/Y Nyemo pluton, southern Tibet: Implications for Oligocene magma mixing and the onset of extension of the southern Lhasa terrane [PDF]

, 2020
Post-collisional potassic and high Sr/Y magmatism in the Lhasa terrane provides critical constraints on the timing and mechanism of subduction of Indian lithosphere and its role in the uplift of the Tibetan Plateau.
Asimow, Paul D., Liu, Dong, Mo, Xuanxue, Sheikh, Lawangin, Wang, Qing, Wang, Zhenzhen, Zhang, Liangliang, Zhao, Zhidan, Zhu, Di-Cheng   +8 more
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