Results 81 to 90 of about 8,773 (164)

Eoarchean–Paleoproterozoic Tectonothermal History of the Acasta Gneiss Complex Constrained by Titanite and Apatite Petrochronology

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract Deciphering Earth's earliest geodynamic processes requires temporally constrained chemical and structural data from rare exposures of ancient rocks. One of the most well‐studied of these exposures is the Acasta Gneiss Complex (AGC) in the Northwest Territories, Canada, which contains the oldest known felsic rocks on Earth.
Omar Khalil Droubi, Ann M. Bauer, Chloë Bonamici, William O. Nachlas, Joshua M. Garber, Michael J. Tappa, Jesse R. Reimink   +6 more
wiley   +1 more source

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

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract 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 shallow subduction in the Oligocene.
C. D. Hiett, D. L. Newell, J. W. Shervais   +2 more
wiley   +1 more source

Late Cretaceous Extensional Collapse Driven by Delamination in Central Tibet Prior to India‐Asia Collision

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract A diverse range of dikes in the western Lhasa–Qiangtang collision zone provides constraints on the evolution of post‐collisional tectonomagmatic processes and the growth of the Tibetan Plateau. We report geochronological, geochemical, and Sr–Nd–Hf isotopic data for granitic dikes in the Rebang area of the Northern Lhasa Block, northern Tibet ...
Yao Xiao, Xi Jun Liu, Hao Wu, Min Liu, Hai Yong Liu, Yu Jia Song, Fei Liu   +6 more
wiley   +1 more source

The Tectonic Responses in the Overriding Plate During the Tethyan Convergence and the Progressive Extrusion Process in Sundaland: Insights From the Wuliangshan Massif, SE Tibetan Plateau

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract The overriding plate commonly accumulates less strain than the subducted plate during continental collision. Analyzing plate interactions from the perspective of the overriding plate provides important insights into orogenic dynamics. In the southeastern Tibetan Plateau, the Wuliangshan massif, as a key region of the overriding plate, records ...
Qinying Wu, Wei Lin, Lingtong Meng, Yin Wang, Fei Liu, Yang Chu, Wei Wei, Michel Faure, Vuong Van Nguyen, Hoai Luong Thi Thu, Chao Song, Zhao Guo   +11 more
wiley   +1 more source

Savanyú vulkáni üvegek ásványtan-geokémiai vizsgálata, petrológiai és vulkanológiai kiértékelése = Mineralogical and geochemical study of acid volcanic glasses, and its interpretation from petrological and volcanological point of view [PDF]

, 2009
Változatos lemeztektonikai környezetben képződött obszidián minták fő- és nyomelemtartalmának összehasonlító vizsgálata során megállapítottuk, hogy az eredetileg gránitokra kidolgozott diszkriminációs diagramok alkalmazhatók a savanyú kiömlési kőzetek ...
Balázs, Éva, Dobos, Erik, Rózsa, Péter, Simulák, József, Szakáll, Sándor   +4 more
core  

The Inter‐Cratonic Neoproterozoic Katangan Basin of Central Africa: Rift Basin Formation, Orogenic Inversion and Potential Fluid Pathways

Tectonics, Volume 44, Issue 7, July 2025.
Abstract The tectono‐stratigraphic development of continental basins is critical to an understanding of continental tectonics and the formation of metal deposits. The Neoproterozoic, inter‐cratonic Katangan copper basin of Central Africa records a tectono‐stratigraphic evolution and the generation of potential metal transporting fluid pathways ...
M. C. Daly, M. Zimba, M. Purkiss, F. Chibesakunda   +3 more
wiley   +1 more source

Effect of cement water contacting an aged cementitious grout on the dissolution rates of inactive nuclear glass SON68

Journal of the American Ceramic Society, Volume 108, Issue 7, July 2025.
Abstract The long‐term behavior of high‐level radioactive waste glass depends on the mineralogical and geochemical interactions between the various components of the multibarrier system, under geological repository conditions. The present study focuses on SON68 glass alteration in synthetic cement water and at 50°C and 70°C.
Mathieu Debure, Sylvain Grangeon, Christelle Martin, Nicolas Michau, Yannick Linard, Xavier Bourbon, Sandra Ory, Nicolas Maubec, Catherine Lerouge   +8 more
wiley   +1 more source

Partial radiogenic heat model for Earth revealed by geoneutrino measurements [PDF]

, 2011
The Earth has cooled since its formation, yet the decay of radiogenic isotopes, and in particular uranium, thorium and potassium, in the planet’s interior provides a continuing heat source. The current total heat flux from the Earth to space is 44:2±1.0
Dwyer, D. A., Gando, A., McKeown, R. D., Zhang, C.   +3 more
core  

Profound Impact of Premelting in the HCP‐Structured Earth's Inner Core

Geophysical Research Letters, Volume 52, Issue 12, 28 June 2025.
Abstract The Earth's inner core shows distinct features, including low shear velocities and a high Poisson's ratio, often linked to hexagonal close‐packed iron (HCP‐Fe) through high‐pressure experiments and calculations. Premelting is proposed as a key mechanism behind the observed shear softening in HCP‐Fe. This study uses magnesium, an HCP‐structured
Chao Liu, Wei Song, Yonggang Liu, Feiwu Zhang   +3 more
wiley   +1 more source

Trans‐Oceanic Distributed Sensing of Tides Over Telecommunication Cable Between Portugal and Brazil

Geophysical Research Letters, Volume 52, Issue 12, 28 June 2025.
Abstract Geophysical sensing in the open ocean is both costly and technically challenging. Here we developed a novel distributed fiber optic sensing technique that employs microwave modulation for phase measurement in signals returned from submarine repeaters.
Meichen Liu, Luis Costa, Pierre Mertz, Siddharth Varughese, Sumudu Edirisinghe, Valey Kamalov, Zhongwen Zhan   +6 more
wiley   +1 more source