Results 61 to 70 of about 452 (179)

Petrogenesis and tectonic implications of I-type and A-type granitoids in the Dachadaban area, North Qilian Orogenic Belt

Frontiers in Geochemistry
The North Qilian Orogenic Belt is a key region for understanding the evolution of the Paleo-Asian Ocean and continental accretion. The Dachadaban area preserves a complete ophiolite suite and coeval granitoid intrusions. Zircon and apatite U–Pb geochronology, whole-rock geochemistry, and Sr–Nd isotopic analyses were conducted on ...
Jie Sun, Zhiguo Zhang, Zengxia Zhao, Guoqiang Tang, Xuelian Xing   +4 more
openaire   +1 more source

U–Pb geochronology and zircon composition of late Variscan S- and I-type granitoids from the Spanish Central System batholith [PDF]

International Journal of Earth Sciences, 2012
The Spanish Central System (SCS) batholith, located in the Central Iberian Zone, is one of the largest masses of granite in the European Variscan Belt. This batholith is a composite unit of late- and post-kinematic granitoids dominated by S- and I-type series granite, with subordinate leucogranite and granodiorite.
Orejana, David, Villaseca, Carlos, Valverde-Vaquero, Pablo, Belousova, Elena, Armstrong, Richard   +4 more
openaire   +3 more sources

Resolving Micrometre‐Scale Zircon Growth in Silicic Systems by 7 μm LA‐MC‐ICP‐MS U‐Pb Dating: Linking Petrology and Geochronology in Silicic Volcanic and Granitic Rocks from Victoria, Australia

Geostandards and Geoanalytical Research, Volume 50, Issue 3, Page 625-647, September 2026.
Key Points 7 μm spot‐diameter LA‐MC‐ICP‐MS analyses yield accurate zircon U‐Pb ages. 1013 Ω amplifier resistors improve low‐signal Pb measurements. Saturn correction protocols minimise down‐hole fractionation effects. We present a systematic evaluation of high spatial‐resolution zircon U‐Pb dating using a Thermo Scientific Neoma multi‐collector ICP‐MS ...
Cristiano Lana, John D. Clemens
wiley   +1 more source

Geochemistry, Petrogenesis and Tectonic Signification of the I-Type Granitoids in Ladde-Gore (Northern Domain, North Cameroon)

International Journal of Geoinformatics and Geological Science
The Ladde-Gore region is located in the northern domain of the Pan-African chain in Cameroon. The present work deals with the petrography and geochemistry of the granitoids of the Ladde-Gore region. The granitoids in the study area consist of amphibole granite, amphibole-biotite granite, amphibole-biotite-muscovite granite, and granodiorite.
Amadou Diguim Kepnamou, Yaya Fodoué, Mahamat Abakar, Wassouo Wadjou Jacques   +3 more
openaire   +1 more source

(Ultra)high‐Pressure Metamorphism in Sedimentary Versus Basaltic Rocks: Insights From a Variscan Mélange in the South Carpathians

Journal of Metamorphic Geology, Volume 44, Issue 8, Page 585-610, September 2026.
ABSTRACT Reconstructing the pressure–temperature–time (P–T–t) evolution of (ultra)high‐pressure rocks is essential for constraining subduction and collisional dynamics. Subduction zones are often investigated using basic eclogites, whereas nonbasic high‐pressure rocks remain comparatively understudied, potentially hindering a comprehensive ...
Otavio S. G. Silva, Bruno V. Ribeiro, Gavril Săbău, Fabricio Caxito, Paulo A. de Paiva‐Silva, Pierre Lanari, George Luvizotto, Mahyra Tedeschi   +7 more
wiley   +1 more source

Geophysical update of the diameter of the Zhamanshin impact structure, Kazakhstan

Meteoritics &Planetary Science, Volume 61, Issue 9, Page 2284-2302, September 2026.
Abstract The rim of the 0.9‐Ma‐old Zhamanshin impact crater in Kazakhstan is considered to be almost completely exposed via a series of hills surrounding a central flat area, indicating an apparent diameter of 14 km. This would make Zhamanshin the second largest impact crater of the Quaternary period. However, the overall geometry of these hills is not
Yoann Quesnel, Dilyara M. Kuzina, Jérôme Gattacceca, Minoru Uehara, Ayrat G. Kharisov, Dmitry D. Badyukov, Pierre Rochette   +6 more
wiley   +1 more source

Surface ages of alluvial fans in the southern Central Andes recorded by ground‐ and space‐based hyperspectral reflectance

Earth Surface Processes and Landforms, Volume 51, Issue 8, August 2026.
Secondary weathering of alluvial‐fan surfaces records the relative, and even absolute, ages of deposited sediments up to 300 ka. Hyperspectral imagery quantifies evolving mineral‐weathering pathways to unlock high‐resolution mapping and dating of these sedimentary landscapes.
Henry T. Crawford, Mitch K. D'Arcy, Andreas Ruby, Ana Laura Martínez López, Philippa J. Mason, Taylor F. Schildgen, Ricardo N. Alonso   +6 more
wiley   +1 more source

Geology, alteration, mineralization, petrogenesis, geochronology, geochemistry and airborne geophysics of Kuh Shah prospecting area, SW Birjand

Journal of Economic Geology, 2012
The Kuh Shah prospecting area is located in Tertiary volcano-plutonic belt of the Lut Block. More than seventeen subvolcanic intermediate to acidic intrusive rocks, diorite to syenite in composition, were identified in the study area.
Maryam Abdi, Mohammad Hassan Karimpour
doaj   +3 more sources

Geology, Alteration, Mineralization, Geochemistry and Petrology of intrusive units in the Shah Soltan Ali prospect area (Southwest of Birjand, South Khorasan province)

Journal of Economic Geology, 2017
Introduction The Shah Soltan Ali area is located 85 km southwest of Birjand in the South Khorasan province. This area is part of the Tertiary volcanic-plutonic rocks in the east of the Lut block. The Lut block is bounded to the east by the Nehbandan and
Samaneh Nadermezerji, Mohammad Hassan Karimpour, Azadeh Malekzadeh Shafaroudi   +2 more
doaj   +1 more source

Petrogenesis and tectonic implications of Early Cretaceous I-type granites from offshore drilling in east of the Fuzhou City, Southeast China

Geosystems and Geoenvironment
The Cretaceous (
Han Yan, Xi-Yao Li, Xun Yuan, Sanzhong Li, Xin Chen, Pengcheng Wang, Yu Wang, Jie Gao   +7 more
doaj   +1 more source