Results 51 to 60 of about 318,975 (205)

Tectonic setting and evolution of the Morin anorthosite, Grenville province, Quebec [PDF]

Bulletin of the Geological Society of Finland, 1970
The Morin Anorthosite Mass underlies an area of 2 500 square kilometers; it consists of three tectonic units: a dome, a diapir and a nappe. The units have in common a large part of their magmatic history, but their tectonic evolution is different.
J. Martignole, K. Schrijver
doaj   +1 more source

Iron isotope, major and trace element characterization of early Archean supracrustal rocks from SW Greenland: Protolith identification and metamorphic overprint

, 2007
International audienceThe iron isotope, trace and major element compositions of Eoarchean supracrustal rocks from southern West Greenland (Isua Supracrustal Belt, the islands of Akilia and Innersuartuut) were analyzed in order to identify protoliths and ...
van Zuilen, Mark, Janney, Philip E., Dauphas, Nicolas, Busigny, Vincent, E. Janney, Philip, Lepland, Aivo, Wadhwa, Meenakshi   +6 more
core   +1 more source

A hydrothermal karst-hosted U-P deposit related to Pangea break-up: Itataia deposit, Borborema Province, Northeastern Brazil - a review

Journal of the Geological Survey of Brazil, 2018
The Itataia U-P deposit holds the second largest uranium reserve in Brazil. All of the uranium is contained within the microcrystalline structure of fluorapatite, which is the ore mineral of the collophanite bodies.
José Adilson D. Cavalcanti, Maria Dulcinea M.R. Bessa, Roberto Ventura Santos, Cesar U.V. Veríssimo, Clovis Vaz Parente   +4 more
doaj   +1 more source

Huge growth of the late Mesoarchean–early Neoarchean (2.6~3.0 Ga) continental crust in the North China Craton: A review

Dizhi lixue xuebao, 2022
Based on a brief introduction of the spatial distribution, rock types and formation ages of the late Mesoarchean–early Neoarchean (2.6~3.0 Ga) rocks in some key areas of the North China Craton, this paper summarizes the ages and geochemical and Nd-Hf-O ...
WAN Yusheng, DONG Chunyan, XIE Hangqiang, LI Yuan, WANG Yuqing, WANG Kunli   +5 more
doaj   +1 more source

A Reassessment of Petrochemistry of ~1.2 Ga Tonalitic Rocks of the Northern Tugela Terrane, Natal Metamorphic Belt, South Africa: Further Constraints on the Evolution of This Belt

Geological Journal, EarlyView.
Our petrochemical studies on ~1.2 Ga granitoids of the Natal Metamorphic Belt, South Africa, do not suggest any property similar to Phanerozoic‐style subduction‐related granitoids. Plot of Kotongweni Tonalite in Y versus Sr diagram (after Moyen 2011), note that most samples have Sr/Y < 50.
Palesa Leuta, Saumitra Misra, Thembiso O. Basupi   +2 more
wiley   +1 more source

Geochronology and metamorphic evolution of the biotite-plagioclase gneisses from the Luanxian Group in eastern Hebei, North China Craton

Frontiers in Earth Science
Previous metamorphic studies in the eastern Hebei terrane have predominantly focused on rocks within gneiss domes and the Saheqiao linear tectonic belt, while the metamorphosed supracrustal rocks of the Luanxian Group in the Lulong-Shuangshanzi ...
Daji Zu, Zhanzhan Duan, Wei Cui, Liqun Yang, Jia Liu, Zhiqiang Tian, Juquan Zhang   +6 more
doaj   +1 more source

Heterogeneous Exhumation Mechanisms in Neoproterozoic Collisional Metamorphism: P–T Constraints From Pelotas and Punta del Este Terranes, Southern Brazil and Uruguay

Geological Journal, EarlyView.
Petrography, thermobarometry, and pseudosection modelling reveal peak metamorphic conditions of 3–7.5 kbar and 520°C–800°C in Tonian‐Cryogenian orthogneisses of the Dom Feliciano Belt. Metamorphic field gradients of 27°C/km–39°C/km and variable exhumation mechanisms support correlation of these units as remnants of a Himalayan‐type Piratini Orogeny ...
Thaiane Niederauer‐Santos, Carla Cristine Porcher, Daniel Triboli Vieira, Edinei Koester, Diego Jaldín, Karina Luengo, Luisa Caon   +6 more
wiley   +1 more source

Gold-hosting supracrustal rocks on Storø, southern West Greenland:Lithologies and geological environment [PDF]

, 2007
A gold prospect on central Storø in the Nuuk region of southern West Greenland is hosted by a sequence of intensely deformed, amphibolite facies supracrustal rocks of late Mesoto Neoarchaean age.
van Gool, Jeroen A M, Rink-Jørgensen, Matilde, Persson, Mac, Szilas, Kristoffer, Hollis, Julie A, Knudsen, Christian, Østergaard, Claus, Hollis, Julie A.   +7 more
core   +1 more source

On the occurrence of scheelite in the Archaean Malene supracrustal rocks, southern West Greenland

Rapport Grønlands Geologiske Undersøgelse, 1986
Scheelite in the Godthåbsfjord area (fig. 1) was found in heavy mineral concentrates from stream sediments in 1982, and in situ scheelite was discovered in 1982 on Storø in Godthåbsfjord (Appel, 1983a). During 1983 further work was carried out on the islands of Storø and Sermitsiaq in Godthåbsfjord and on the Store Malene mountain next to Nuuk (Godthåb)
P.W.U Appel, A A Garde
openaire   +2 more sources

Sensitization of OSL Signals in Quartz and Provenance Implications: Insights From Multi‐Spectroscopic Analysis of Quartz From Multiple Geological Settings

Journal of Geophysical Research: Earth Surface, Volume 131, Issue 10, October 2026.
Abstract Quartz optically stimulated luminescence (OSL) sensitivity and electron spin resonance (ESR) signals have been empirically proposed as indicators of sediment provenance. OSL sensitivity is defined as luminescence produced per unit dose (Gray: Gy) per unit mass (mg).
Monika Devi, Serban‐Constantin Grecu, Zsejke‐Réka Tóth, Daniela Constantin, Daniela Brezeanu, Anca Barla, Ion Nesterovschi, Simona Cinta‐Pinzaru, Mihai N. Ducea, Stephen J. Mojzsis, Alida Timar   +10 more
wiley   +1 more source