Results 41 to 50 of about 603 (179)

Experimental production of K-rich metasomes through sediment recycling at the slab-mantle interface in the fore-arc

Scientific Reports, 2023
Sediment contribution to the mantle is the key step for the generation of orogenic magmatism to produce its isotopic and geochemical inventory. Even though they are exceptional for the post-collisional settings, there are worldwide examples of arc ...
Fatma Gülmez, Dejan Prelević, Michael W. Förster, Stephan Buhre, Jennifer Günther   +4 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

Mid-Cretaceous extensional magmatism in the Alborz Mountains, north Iran; geochemistry and geochronology of Gasht-Masuleh gabbros

Swiss Journal of Geosciences, 2023
In the Gasht-Masuleh area in the Alborz Mountains, gabbroic magma intruded Palaeozoic metasediments and Mesozoic sediments and crystallised as isotropic and cumulate gabbros.
Leila Rezaei, Martin J. Timmerman, Mohssen Moazzen, Uwe Altenberger, Jiří Sláma, Masafumi Sudo, Christina Günter, Franziska D. H. Wilke, Anja M. Schleicher   +8 more
doaj   +1 more source

Lithosphere beneath the Evolving Tianshan Orogen: Constraints from Xenoliths

Lithosphere, 2022
The Ortosuu and Uchkuduk regions of the Tianshan orogen contain a volumetrically small series of basaltic rocks erupted primarily during the late Mesozoic-Paleogene. Petrology, chemical composition, and P-T geotherm data from xenoliths within the basalts
Nancy Hui-Chun Chen, Peter A. Cawood, Yoshiyuki Iizuka   +2 more
doaj   +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

Variable Upper Mantle Geochemical Processes Constrained From Independent Component Analysis of the Fizh Massif, Northern Oman Ophiolite

Geochemistry, Geophysics, Geosystems
We statistically analyzed the whole‐rock compositions of peridotites in the Oman ophiolite using a multivariate statistical technique called independent component analysis (ICA) to better understand the processes within the ophiolitic mantle section that
Yuto Miki, Eiichi Takazawa, Kenta Ueki, Tatsu Kuwatani   +3 more
doaj   +1 more source

Mantle melting versus mantle metasomatism – “The chicken or the egg” dilemma

Chemical Geology, 2017
AbstractMost eclogitic mantle xenoliths brought to the surface exhibit a certain degree of enrichment with incompatible elements, usually attributed to the effect of mantle metasomatism by a putative metasomatic fluid. The metasomatic overprint is represented mainly by enrichments in Na, K, Ba, Ti and LREE and the original source of this fluid remains ...
Kiseeva, Ekaterina S., Kamenetsky, Vadim S, Yaxley, Greg, Shee, Simon R.   +3 more
openaire   +3 more sources

Vanadium Isotopic Compositions of the High‐3He/4He Baffin Island Lavas

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 8, August 2026.
Abstract The isotopic composition of vanadium (V) in hotspot lavas provides new insight into the source of deep mantle heterogeneities. We measured V isotopic compositions in Paleogene Baffin Island lavas, which erupted above the Iceland plume head, to constrain the mantle plume source. These lavas have V isotopic compositions that are lighter (−0.96 ± 
Jonas Kaare‐Rasmussen, Forrest Horton, Maureen Auro, Andy W. Heard, Sune G. Nielsen   +4 more
wiley   +1 more source

Mantle xenoliths from Komsomolskaya kimberlite pipe, Yakutia: Multistage metasomatism

Geosystems and Geoenvironment
Minerals from > 200 mantle xenoliths from Komsomolskaya kimberlite pipe were studied by electron microprobe and LA-ICP-MS. They are metasomatised garnet and spinel peridotites containing phlogopite, amphibole and ilmenite with garnets (up to 12.5 wt ...
Igor V. Ashchepkov, Theodoros Ntaflos, Nikolai S. Medvedev, Nikolai V. Vladykin, Alla M. Logvinova, Denis S. Yudin, Hilary Downes, Igor V. Makovchuk, Ravil F. Salikhov   +8 more
doaj   +1 more source

Thallium Isotopes Reveal Brine Activity During Carbonatite Magmatism

Geochemistry, Geophysics, Geosystems, 2021
Carbonatite volcanism remains poorly understood compared to silicic volcanism due to the scarcity of carbonatite volcanoes worldwide and because volcanic H2O and CO2—major components in carbonatite volcanic systems—are not well preserved in the rock ...
Forrest Horton, Sune Nielsen, Yunchao Shu, Alan Gagnon, Jerzy Blusztajn   +4 more
doaj   +1 more source