Results 71 to 80 of about 3,752 (234)

Late Campanian (74–71 Ma) Arabia–Eastern Anatolia Collision and Its Geodynamic Implications

Tectonics, Volume 45, Issue 7, July 2026.
Abstract The East Anatolian Plateau is a major collisional feature within the Tethyan realm formed as a late‐stage result of the collision between East Anatolia and the Arabian Platform. The timing of this collision is highly debated, with estimates from the Late Cretaceous to the Miocene.
Remziye Akdoğan, Xiumian Hu, Gültekin Topuz, Aynur Hakyemez, Rita Catanzariti, Anlin Ma, Yalçın E. Ersoy, İbrahim Uysal   +7 more
wiley   +1 more source

Mafic-silicic magma interaction in the layered 1.87 Ga Soukkio Complex in Mäntsälä, southern Finland [PDF]

Bulletin of the Geological Society of Finland, 2002
The Svecofennian layered Soukkio Complex (1.87 Ga) in Mäntsälä, southern Finland, consists of layered tholeiitic gabbro and porphyritic calc-alkaline monzonite, quartz monzonite and granite, mingled together.
T.T. Eerola
doaj   +1 more source

Integrating Olivine Diffusion Chronometry With Monitoring Data to Decipher the Magma Dynamics at the Submarine Fani Maoré Volcano

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.
Abstract Monitoring data are critical for understanding volcanic unrest and eruption, but they often lack the ability to constrain the pre‐eruptive magma processes. As such, an increasing number of studies couple monitoring data with petrological tools to obtain insights into the causes and durations of magmatic processes. The 2018–2020 eruption of the
Karoline Brückel, Etienne Médard, Fidel Costa, Carole Berthod, Pauline Verdurme, Patrick Bachèlery, Lise Retailleau, Jean‐Christophe Komorowski, Lucia Gurioli   +8 more
wiley   +1 more source

Geochemical and Isotopic Constraints on Long‐Lived Source Enrichment and Mantle Evolution in Paleoproterozoic Cratonic Lamprophyres

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.
Abstract The cratonic lithospheric mantle records complex metasomatic processes and is frequently tapped by alkaline magmatism, offering a unique opportunity to trace the progressive evolution of the mantle. In the present contribution, we investigate a newly identified calc‐alkaline lamprophyre field from the Neoarchean Jonnagiri Schist Belt, Eastern ...
Sourav Naskar, Rohit Pandey, Nils Björn Baumann, N. V. Chalapathi Rao, George Mathew, J. Amal Dev, J. K. Tomson   +6 more
wiley   +1 more source

Peridotite pyroxenite and granulite xenoliths from Cenozoic Shavaryn Tsaram volcanic center (Mongolia): New data

Geosystems and Geoenvironment
Mantle lherzolites (spinel- and garnet-bearing), megacrysts and pyroxenites from Moho and lower crust xenoliths of the Cenozoic basalts of Shavaryn-Tsaram volcanic center were newly studied by the EPMA, SEM and LA-ICP methods to define more precisely ...
I.V. Ashchepkov, A.A. Tsygankov, G.N. Burmakina   +2 more
doaj   +1 more source

Defining Pre-eruptive Conditions of the Havre 2012 Submarine Rhyolite Eruption Using Crystal Archives

Frontiers in Earth Science, 2020
The 2012 Havre eruption evacuated a crystal-poor rhyolite (∼3–7% crystals) producing a volumetrically dominant (∼1.4 km3) pumice raft, as well as seafloor giant pumice (5–8%) and lavas (12–14%) at the vent (∼0.1 km3), both of which have subtly higher ...
Joseph Knafelc, Scott E. Bryan, David Gust, Henrietta E. Cathey   +3 more
doaj   +1 more source

Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts

, 2016
Mantle xenocrysts from early Triassic kimberlite pipes from Kharamai, Ary-Mastakh and Kuranakh fields in the Anabar shield of Siberia revealing similar compositional trends were studied to estimate the superplume influence on the subcratonic lithosphere ...
I. Ashchepkov, S. Kuligin, N. Vladykin, H. Downes, M. Vavilov, E. Nigmatulina, S. Babushkina, N. Tychkov, O. S. Khmelnikova   +8 more
semanticscholar   +1 more source

Geologically Current Rates of Hotspot Motion

Geophysical Research Letters, Volume 53, Issue 9, 16 May 2026.
Abstract Hotspots, sites of mid‐plate volcanism or of excessive volcanism along a plate boundary, overlie plumes of hot rock that rise in the solid state from Earth's mantle. Previously estimated rates of lateral hotspot motion relative to a hotspot reference frame since Late Cretaceous time range from ∼3 to ∼80 mm/yr.
Kevin M. Gaastra, Richard G. Gordon, Gregory Mifflin   +2 more
wiley   +1 more source

Evolution of lithospheric mantle beneath Bulkur diamond orangeitic tuff deposits NE Siberian Craton: Insights from geochemistry and thermobarometry of xenocrysts

Geosystems and Geoenvironment
The xenocrysts of studied Bulkur tuff site 1 with highest diamond grade are comparing with xenocrysts from new site 2 of phreatomagmatic Carnian (Lower Triassic) tuffs in Tuora Sis ridge.
I.V. Ashchepkov, A.P. Smelov, S.A. Grakhanov, A.S. Ivanov, A.M. Logvinova, O.B. Oleinikov, A.Ya. Biller   +6 more
doaj   +1 more source

KIMBERLITE-LIKE ROCKS OF THE URIK-IYA GRABEN, EASTERN SAYAN REGION: MINERAL COMPOSITION, GEOCHEMISTRY AND FORMATION CONDITIONS

Геодинамика и тектонофизика, 2020
The study of the Bol’shaya Tagna alkaline-carbonatite massif and adjacent areas was focused on the mineral and chemical compositions of minerals, the distribution of petrogenic and trace elements in pyroxene-free alkaline picrites in veins and dikes ...
V. B. Savel'eva, Yu. V. Danilova, E. P. Bazarova, B. S. Danilov   +3 more
doaj   +1 more source