Results 61 to 70 of about 297,462 (204)

Age of the Tokkalehto metagabbro and its significance to the lithostratigraphy of the early Proterozoic Kuusamo supracrustal belt, northern Finland [PDF]

Bulletin of the Geological Society of Finland, 2001
The c. 30-km2 Tokkalehto metagabbro and associated sills and dykes intrude a large part of the western part of the early Proterozoic Kuusamo supracrustal belt in northern Finland. These rocks have previously been mapped as a metavolcanic unit, Greenstone
P.M. Evins, K. Laajoki
doaj   +1 more source

Sequential Wedge Extrusion to Core Complex Extension: The Central Cycladic Detachment System on Syros, Greece

Tectonics, Volume 45, Issue 7, July 2026.
Abstract Syros island preserves pristine high‐pressure metamorphic rocks and provides invaluable insight into subduction zone processes. Contrasting views on the structural history impede placing the island in a clear tectonic framework, limiting the broader impact of preserved information.
Bertram Uunk, Fraukje Brouwer, Manuel de Paz‐Álvarez, Sander Taal, Lisa van de Beek, Martijn Ephraim, Guido Jonker, Naomi van den Ameele, Zoë Toorenburg, Boris Versteegh, Marjolein Daeter, Jan Wijbrans   +11 more
wiley   +1 more source

Geochemistry and tectonic significance of the Mesoproterozoic Kgwebe metavolcanic rocks in northwest Botswana: implications for the evolution of the Kibaran Namaqua-Natal Belt

, 1998
The c. 1.1 Ga Kgwebe metavolcanic rocks exposed in the northwest of Botswana are late Kibaran rocks. They represent a bimodal suite of Within-Plate low titanium-phosphorus (LTP) continental tholeiites and post-orogenic Within-Plate high-K rhyolites.
R. B. M. MAPEO, A. B. KAMPUNZU, P. AKANYANG, M. WENDORFF, B. N. MODIE   +4 more
core   +1 more source

P–T Modelling Constrains the Depth of Emplacement of the Porto Azzurro Pluton and Implies Minor Exhumation Caused by the Zuccale Fault (Island of Elba, Italy)

Journal of Metamorphic Geology, Volume 44, Issue 6, Page 440-469, July 2026.
ABSTRACT Understanding the pressure of emplacement of granitic intrusions is crucial to understanding the exhumation history of plutons and constraining the tectonic setting of magma emplacement. However, P–T and geochronological constraints from exhumed plutons are often characterized by large uncertainties, especially in shallow crustal settings with
Samuele Papeschi, Marco Bonini, Matteo Lupi, Chiara Del Ventisette, Domenico Montanari   +4 more
wiley   +1 more source

General geology, alteration, and iron deposits in the Palaeoproterozoic Misi region, northern Finland [PDF]

Bulletin of the Geological Society of Finland, 2003
The Paleoproterozoic Misi region forms the northeastern part of the Peräpohja Schist Belt in northern Finland. The area comprises mafic volcanic land sedimentary rocks, differentiated gabbros, and late-orogenic granitoids.
T. Niiranen, E. Hanski, P. Eilu
doaj   +1 more source

Hyperspectral Fingerprinting of Dune Sediments Across the Arabian Peninsula: Insights Into Sediment Provenance and Transport Pathways From NASA's EMIT Data

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract The Arabian Peninsula encompasses one of the world's most extensive aeolian systems, yet the provenance and transport history of its dune sediments are not well understood. Using hyperspectral data from NASA's Earth Surface Mineral Dust Source Investigation (EMIT), we mapped mineral compositions and abundance patterns across dune fields and ...
Ahmed Alshakr, Mohamed Sultan, Mustafa Kemal Emil, Hassan Alharbi, Fahad Alshehri, Abdullah A. Alotaibi, Abdullah T. Mohammad, Aylin Yildirim, Neil C. Sturchio   +8 more
wiley   +1 more source

Tourmalinites of the Brusque Group in the São João Batista-Tijucas area, State of Santa Catarina, Brazil [PDF]

Geologia USP. Série Científica, 2013
The Dom Feliciano Belt, in the State of Santa Catarina, is represented by the Itaja and Brusque groups and the Florianpolis Batholith. The basal Rio do Oliveira Formation of the Brusque Group consists of metabasic/calc-silicate, metavolcanic-exhalative ...
Miguel Angelo Stipp Basei, Fabio Brentan, Gianna Maria Garda   +2 more
doaj   +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

Enrichment from plume interaction in the generation of Neoproterozoic arc rocks in northern Eritrea: implications for crustal accretion in the southern Arabian-Nubian Shield [PDF]

, 2002
The Neoproterozoic volcano-sedimentary-plutonic associations in Eritrea are part of the Arabian-Nubian Shield (ANS). In the Nakfa region, northern Eritrea, low-grade metavolcanic rocks consist of calc-alkaline crystal tuffs, lapilli cuffs and basic and ...
Kröner, Alfred, Teklay, M., Mengist Teklay, Mezger, K., Mezger, Klaus, Teklay, Mengist, Klaus Mezger, Alfred Kröner, Kröner, A.   +8 more
core   +1 more source

Impact and Crystallization Modeling of the Sudbury Basin and Its Implications for a Hadean Crust

Journal of Geophysical Research: Planets, Volume 131, Issue 6, June 2026.
Abstract The 1.85 Ga Sudbury Structure hosts Earth's largest and best‐preserved impact‐induced melt sheet, the Sudbury Igneous Complex (SIC), which crystallized into distinct noritic, gabbroic, and granophyric layers. We conduct impact simulations with iSALE‐2D and crystallization modeling using alphaMELTS 2 to track the formation and evolution of the ...
Nicolas B. Litza, Miki Nakajima, J. Brian Balta, Steven B. Shirey, Dustin Trail, Kim A. Cone, Ian Szumila, Rasmus Haugaard, Taus R. C. Jørgensen, Scott D. Hull, Michael R. Ackerson   +10 more
wiley   +1 more source