Results 41 to 50 of about 297,722 (205)

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

Precambrian crustal evolution and Cretaceous–Palaeogene faulting in West Greenland: The Nordre Strømfjord shear zone and the Arfersiorfik quartz diorite in Arfersiorfik, the Nagssugtoqidian orogen, West Greenland [PDF]

Geological Survey of Denmark and Greenland Bulletin, 2006
The Nordre Strømfjord shear zone in the fjord Arfersiorfik, central West Greenland, consists of alternating panels of supracrustal rocks and orthogneisses which together form a vertical zone up to 7 km wide with sinistral transcurrent, ductile ...
Stensgaard, Bo Møller, Glassley, William E., Korstgård, John A., Sørensen, Kai   +3 more
doaj  

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

Widespread poly-metamorphosed Archean granitoid gneisses and supracrustal enclaves of the southern Inukjuak Domain, Québec (Canada)

, 2020
International audienceThe ~12,000 km2 Inukjuak Domain in northern 79 Québec is part of the Archean Minto Block in the northwestern Superior Province of Canada. Eoarchean (ca.
Bleeker, Wouter, Cates, Nicole, L, Tropper, Peter, Kelly, Nigel M., Mojzsis, Stephen J., Greer, Jennika, Caro, Guillaume, Mojzsis, Stephen, J, Cates, Nicole L., Kelly, Nigel, M   +9 more
core   +1 more source

Flexural bulges and foredeep basins: Dynamic tectonic control on shifting depocentres and condensed facies, Upper Cretaceous (Santonian), Western Canada Foreland Basin

The Depositional Record, Volume 12, Issue 4, September 2026.
Allostratigraphically defined mudstone packages show marked along‐strike thickness variation, interpreted to be related to shifting thrust activity in the orogen; loading cycles lasted about 750 kyr. Close to the orogen, the forebulge is mantled by shelly sandstone whereas far from the orogen, the forebulge is typified by organic‐rich mudstone ...
Omar N. Al‐Mufti, A. Guy Plint, El‐Mahadia I. Mohammed, Ireneusz Walaszczyk, Y. Greg Hu   +4 more
wiley   +1 more source

Thermal contraints on high-pressure granulite metamorphism of supracrustal rocks [PDF]

, 1983
The circumstances leading to the formation and exposure at the Earth's surface of supracrustal granulites are examined. These are defined as sediments, volcanics, and other rock units which originally formed at the surface of the Earth, were ...
Ashwal, L. D., Morgan, P., Leslie, W. W.
core  

Detrital zircon record and tectonic setting [PDF]

, 2012
Funding: University of St AndrewsDetrital zircon spectra reflect the tectonic setting of the basin in which they are deposited. Convergent plate margins are characterized by a large proportion of zircon ages close to the depositional age of the sediment,
Hawkesworth, Chris, Cawood, Peter Anthony, Hawkesworth, C. J., Dhuime, B., Dhuime, Bruno Philippe Marcel, Cawood, P. A.   +5 more
core   +1 more source