Results 91 to 100 of about 17,505 (279)

Fluid or Melt? Distinguishing Syn‐Deformational Interaction Pathways

Journal of Metamorphic Geology, Volume 43, Issue 8, Page 810-838, October 2025.
ABSTRACT Understanding whether deformation occurred in the presence of aqueous fluid or silicate melt is crucial for interpreting ductile shear zones, impacting their thermal and geochemical evolution, and having rheological consequences. To identify the syn‐deformational fluid type, we investigate contrasting shear zones active during the Alice ...
Hindol Ghatak, Nathan R. Daczko, Sandra Piazolo, Tom Raimondo   +3 more
wiley   +1 more source

Formation Age Data of the Trachyte Explosive Tube in Middle Timan as a Reflection of the Final Activation of Interplate Alkaline Potassium Magmatism

Vestnik Permskogo Universiteta: Seriâ Geologiâ
The 40Ar/39Ar method determined the age of sanidine from high-potassium trachyte fragments of pipe fluid-explosive breccia. Fluid-explosive breccia breaks through the basalts of the Early Devonian Kanino-Timan complex.
I. I. Golubeva, A. V. Travin, I. N. Burtsev   +2 more
doaj   +1 more source

U–Pb zircon geochronology, petrochemical and Sr–Nd isotopic characteristic of Late Neoproterozoic granitoids of the Bornaward complex (Bardaskan-NE Iran) [PDF]

, 2014
The Bornaward granitoids in the Taknar zone are located in the northeast of the central Iranian block in northeast Iran (Khorasan Razavi province), about 280 km southwest of Mashhad city and 28 km northwest of Bardaskan city.
Heidarian Shahri, M. R., Karimpour, M. H., Lang Farmer, G., Monazzami Bagherzadeh, R., Rahimi, B., Santos, J. F., Stern, C. R.   +6 more
core   +1 more source

A Paleotectonic Atlas of the African Plate: Permian to Recent

Journal of Petroleum Geology, Volume 48, Issue 4, Page 231-279, October 2025.
ABSTRACT The fragmentary release of petroleum data defining the deep structure and stratigraphy of African basins has been integrated with existing literature to compile 19 tectonic maps over key geological intervals from Permian to Recent times. African plate margins range in their age of opening from Late Triassic (off Lebanon), through Early/Middle ...
Duncan S. Macgregor, Colin V. Reeves
wiley   +1 more source

Coeval interaction between magmas of contrasting composition (Late Carboniferous-Early Permian Santa Eulália-Monforte massif, Ossa-Morena Zone): field relationships and geochronological constraints

Geologica Acta, 2017
The Santa Eulália-Monforte massif is a post-kinematic Late Carboniferous-Early Permian calc-alkaline composite massif (LC-EP) located in the Ossa-Morena Zone (OMZ, Portugal).
M.F. PEREIRA, C. GAMA, C. RODRÍGUEZ
doaj  

Permian 40Ar/39Ar ages for post-Variscan minor intrusions in the Iberian Range and Spanish Central System [PDF]

, 2008
40Ar/39Ar dating of biotite from a calc-alkaline gabbro stock NW of Loscos in the Iberian Range yielded a slightly disturbed gas release spectrum. It has an early Permian, 288.5 ± 1.4 Ma total gas age, interpreted as the minimum emplacement age. The 40Ar/
Jan Timmerman, Martin, Museo Nacional de Ciencias Naturales. Departamento de Geología, Perini, Giulia   +2 more
core   +2 more sources

Oligocene to Miocene Topographic Inversion and Accelerated Uplift of Southern Tibet Revealed by the Paleodrainage Evolution of Intermontane Basins

Geophysical Research Letters, Volume 52, Issue 17, 16 September 2025.
Abstract The uplift history of the Gangdese arc in Southern Tibet is fundamental to understanding when and how the plateau attained its current elevation and topographic relief. Detrital multi‐mineral provenance analysis of the Oligocene–Miocene strata in the intermontane Wuyu Basin provides new key information on the paleodrainage evolution in ...
Er‐Kun Xue, Qiang Wang, David Chew, Wei‐Wei Xue, Wang‐Chao Li, Tong‐Yu Huang   +5 more
wiley   +1 more source

Resolving Crustal and Subcrustal Dynamic Sources in Continental Arc Magmas: The Cenozoic Andean Arc of Central Chile

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 9, September 2025.
Abstract The Andean margin of Central Chile (∼32°40′–34°30′S) records abundant Cenozoic arc magmatic activity with variable compositional characteristics. This is examined through the analysis of an extensive database of new and published whole‐rock geochemistry and Sr‐Nd isotopic compositions, in addition to zircon Hf and O isotopic compositions.
M. Muñoz‐Gómez, C. M. Fanning, F. Tapia, I. Payacán, F. Fuentes, M. Farías, R. Charrier, M. Polvé, S. Quiñones, K. Deckart, A. Fock   +10 more
wiley   +1 more source

Northwest Africa 16788: The Largest Known Individual Martian Meteorite—A New Olivine Microgabbroic Shergottite and Its Implications for Martian Magmatism

Journal of Geophysical Research: Planets, Volume 130, Issue 9, September 2025.
Abstract We present a comprehensive study of a new Martian meteorite, Northwest Africa (NWA) 16788, found in the Sahara Desert in July 2023. This specimen constitutes the largest known individual meteorite of Martian origin, with a total weight of ⁓25 kg. A detailed mineralogical and geochemical investigation identifies NWA 16788 as an enriched olivine
Xhonatan Shehaj, Giovanni Pratesi, Cristian Carli, Riccardo Avanzinelli, Alice Stephant, Annarita Franza, Eleonora Ammannito   +6 more
wiley   +1 more source

The Petrogenesis and Geochemistry of Tabas Black Land volcanic field: implications for volcanic activity along the Nayband fault, East Iran

Volcanica, 2019
The Tabas Black Land volcanic field (14 Ma) is on the major right lateral Nayband fault, on the Lut Block, Iran. It has a central area of eroded ventd, surrounded by lavas. Lavas are tilted and folded on the east by the Nayband fault.
Esmail Elahpour, François Nauret, Etienne Medard, Mhammed Benbakkar, Gabrielle Quéinnec, Benjamin van Wyk de Vries   +5 more
doaj   +1 more source