Results 61 to 70 of about 15,451 (231)

Granitoides e séries magmáticas: o estudo contextualizado dos granitoides

Pesquisas em Geociências, 2016
A relação que muitas rochas graníticas possuem com magmas menos diferenciados provenientes do manto tem sido subestimada nas últimas décadas, perdendo-se assim uma poderosa ferramenta científica para investigação de ambientes geotectônicos antigos e da própria evolução do sistema manto-crosta. Propõem-se neste trabalho que os magmas graníticos passem a
openaire   +3 more sources

Garnet–Clinopyroxene Double‐Layered Coronae in a Metagabbronorite From the High‐Grade Metamorphic Gföhl Unit, Moldanubian Zone

Journal of Metamorphic Geology, Volume 44, Issue 4, Page 311-336, May 2026.
ABSTRACT This study investigates garnet–clinopyroxene double‐layered coronae in a metagabbronorite from the high‐grade metamorphic Gföhl Unit (Bohemian Massif). The coronae formed at the interfaces between relic magmatic orthopyroxene, still preserved in the cores of the coronae, and the plagioclase‐rich rock matrix.
Rene Asenbaum, Tereza Nemeškalová, Martin Racek, Vojtěch Janoušek, Julian Portenkirchner, Rainer Abart   +5 more
wiley   +1 more source

Physico-mechanical properties and shielding efficiency in relation to mineralogical and geochemical compositions of Um Had granitoid, Central Eastern Desert, Egypt

Frontiers in Earth Science, 2023
The current work aims to describe the physico-mechanical characteristics and shielding efficiency with reference to the mineralogical and geochemical compositions of the Neoproterozoic Um Had composite granitoid pluton in order to deduce their ...
Mohammed A. Rashwan, El Saeed R. Lasheen, Wael Abdelwahab, Mokhles K. Azer, Hesham M. H. Zakaly, Hesham M. H. Zakaly, Hesham M. H. Zakaly, Saad S. Alarifi, Antoaneta Ene, Ismail A. Thabet   +9 more
doaj   +1 more source

Structure of the North‐Central Chile Subduction Zone From Local Earthquake Tomography

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 4, April 2026.
Abstract The fluid cycle in subduction zones prescribes large parts of its structure and seismogenic behavior. Background seismicity inside the downgoing slab is linked to fluid release from dehydration reactions, whereas fluid overpressure along the plate interface can alter interplate coupling, megathrust earthquakes, and the presence or absence of ...
Nicolás Hernández‐Soto, Christian Sippl, Matthew Miller, Dietrich Lange, Frederik Tilmann, Diego González‐Vidal, Juan Carlos Baez, Anne Socquet, Marcos Moreno   +8 more
wiley   +1 more source

The Archean Granitoid-Paleoproterozoic Unconformity: Superimposition of Alteration Events in Archean Granitoids, Gabon

Procedia Earth and Planetary Science, 2013
AbstractThe Archean granitoids of the South Gabon, dated from 3.0-to-2.5 Ga, were examined along the Archean-Proterozoic unconformity. The petrography was based on mineralogical identification using electron microscopy, X-ray diffraction, and the electron microprobe.
Idalina, Mouélé Moubiya, Dudoignon, Patrick, El Albani, Abderrazak, Martin, Hervé, Paquette, Jean-Louis, Cuney, Michel, Gauthier-Lafaye, François   +6 more
openaire   +3 more sources

Deep structure and geodynamic conditions of granitoid magmatism in the Eastern Russia

Записки Горного института, 2020
We investigated the deep structure of the lithosphere and the geodynamic conditions of granitoid magmatism in the Eastern Russia within the borders of the Far Eastern Federal District.
Viktor I. Alekseev
doaj   +1 more source

Pathway Weathering in Granitoid Rocks from Central Region of Angola: Geochemical and Mineralogical Data [PDF]

, 2012
The Central Region of Angola is characterized by the abundance of granitoid rocks, whose weathering “in situ” originated the so-called residual soils. The textural, geochemical and mineralogical properties of these soils depend not only on the chemical ...
Bonito, Fernando A. B., Duarte, Isabel M. R., Falcão, Winnie, Mirão, José A. P., Queta, Felisberto M., Rocha, Fernando J. T.   +5 more
core  

Fine‐Scale Segmentation and Spatiotemporal Variability of the 2010 Mw 8.8 Maule Aftershock Sequence Revealed by a Deep‐Learning‐Based Earthquake Catalog

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 4, April 2026.
Abstract We re‐examine the aftershock sequence of the Mw 8.8 Maule earthquake in south‐central Chile to understand how seismicity, magnitude‐frequency distribution, and fault structure vary along the rupture zone. Using the International Maule Aftershock Deployment (IMAD) data set, we analyze 10 months of continuous data from approximately 156 ...
Rodrigo Flores‐Allende, Léonard Seydoux, Éric Beaucé, Luis Fabian Bonilla, Philippe Gueguen, Claudio Satriano   +5 more
wiley   +1 more source

Azizabad-Hazarkhani granitoid, NE of Songhor: Evidence of a subduction event in the N- Sanandaj-Sirjan continental arc [PDF]

علوم زمین خوارزمی
The study area is located in the SaSZ, NE of Songhor city, Kermanshah Province. Based on field observations and mineralogical data, the Azizabad-Hazarkhani I-type calc-alkaline granitoid consists of granites, monzonites and diorites with small volumes of
Ashraf Torkian, , Mohsen Mohammadi
doaj  

The making of pure quartzose sand in continental interiors: Paraná River (Brazil and Argentina)

Sedimentology, Volume 73, Issue 3, Page 802-837, April 2026.
ABSTRACT As part of a comprehensive project on sedimentary processes in South America, this study focuses on sediment generation in the intracratonic Paraná Basin and monitors the evolution of sand composition along the Paraná River from central Brazil to the Río de la Plata estuary in Argentina.
Eduardo Garzanti, Marta Barbarano, Mara Limonta, Guido Pastore, Pieter Vermeesch, Giovanni Vezzoli   +5 more
wiley   +1 more source