Results 21 to 30 of about 1,938 (228)

Inherited Continental Zircons in Oceanic Rocks – True or False

, 2021
Abstract Many studies have reported U-Pb dates of zircons that are older than the rocks that contain them, and they are therefore thought to be inherited from older rock complexes. Their presence has profound geodynamic implications and has been used to hypothesize about concealed micro-continents, continental crust beneath ocean islands, and ...
Anders Bjerga, Håvard Stubseid, Leif-Erik Pedersen, Rolf Birger Pedersen   +3 more
openaire   +1 more source

Unraveling the origins and P-T-t evolution of the allochthonous Sobrado unit (Órdenes Complex, NW Spain) using combined U–Pb titanite, monazite and zircon geochronology and rare-earth element (REE) geochemistry [PDF]

Solid Earth, 2020
The Sobrado unit, within the upper part of the Órdenes Complex (NW Spain) represents an allochthonous tectonic slice of exhumed high-grade metamorphic rocks formed during a complex sequence of orogenic processes in the middle to lower crust.
J. M. Benítez-Pérez, J. M. Benítez-Pérez, P. Castiñeiras, J. Gómez-Barreiro, J. R. Martínez Catalán, A. Kylander-Clark, R. Holdsworth   +6 more
doaj   +1 more source

The age and origin of the Vaasa migmatite complex revisited [PDF]

Bulletin of the Geological Society of Finland, 2014
The origin of the Vaasa migmatite complex was studied by using whole-rock Sm-Nd and zircon Lu-Hf and U-Pb data in conjunction with whole-rock major and trace element geochemistry.
E. Suikkanen, H. Huhma, M. Kurhila, Y. Lahaye   +3 more
doaj   +1 more source

Neoproterozoic to early Paleozoic extensional and compressional history of East Laurentian margin sequences:the Moine Supergroup, Scottish Caledonides [PDF]

, 2014
This work was in part supported by Natural Environment Research Council grant NE/J021822/1, National Science Foundation grant EAR-0087650, and funds from our respective institutions.Neoproterozoic siliciclastic-dominated sequences are widespread along ...
Merle, Renaud, Millar, I.L., Connelly, J.N., Loewy, Staci L., Strachan, R.A., Nemchin, Alexander A., Nemchin, Alexander, Millar, Ian L., Dalziel, I.W., Merle, Renaud E.,, Cawood, Peter A., Loewy, S.L., Merle, Renaud E., Connelly, James N., Dalziel, Ian W.D., Cawood, P., Connelly, James, Jourdan, Fred, Dalziel, Ian W. D., Kinny, Peter, Kinny, Peter D., Strachan, Robin A.   +21 more
core   +1 more source

Pb age of inherited zircons from leucosomes in grey gneisses of the Salma and Gridino study areas, Belomorian province

Transactions of the Karelian Research Centre of the Russian Academy of Sciences, 2018
Inherited zircons in leucosomes from the Salma and Gridino study areas have been studied. The leucosomes were formed in Palaeoproterozoic shear zones crossw-cutting Archaean tonalite-trondhjemite-granodiorite (grey) gneisses that host amphibolites with ...
Татьяна Владимировна Картушинская, Виктор Валентинович Балаганский, Илья Александрович Горбунов, Александр Николаевич Ларионов, Павел Алексеевич Львов, Tat'yana Kartushinskaya, Viktor Balagansky, Il’ya Gorbunov, Alexander Larionov, Pavel L’vov   +9 more
doaj   +1 more source

Composition and Structure of Zircon from Hydrothermal Uranium Occurrences of the Litsa Ore Area (Kola Region, Russia)

Geosciences, 2020
Zircon grains from various metagranitoids (plagio- and monzo-granites, gneisses, metasomatic rocks, and pegmatoid veins) from the Skal’noe and Dikoe sites of the Litsa uranium ore area (Kola Region, Russia) were studied in order to reconstruct the ...
Tatiana Kaulina, Lyudmila Lyalina, Vadim Kamenetsky, Vadim Il’chenko, Vladimir Bocharov, Maria Gannibal   +5 more
doaj   +1 more source

Cadomian metabasites of the Eastern Pyrenees revisited

Geologica Acta, 2022
This study presents a new geochemical, petrological, and geochronological U–Pb dataset from Ediacaran metabasites of the Canigó and Cap de Creus massifs, Eastern Pyrenees.
Núria Pujol-Solà, Josep Maria Casas, Joaquín A. Proenza, Idael F. Blanco-Quintero, Elena Druguet, Montserrat Liesa, Manuel J. Román-Alpiste, J. Javier Álvaro   +7 more
doaj   +1 more source

U-Th-Pb zircon geochronology on igneous rocks in the Toija and Salittu Formations, Orijärvi area, southwestern Finland: Constraints on the age of volcanism and metamorphism [PDF]

Bulletin of the Geological Society of Finland, 2008
Zircons from a felsic volcanic rock in the Toija Formation and a synvolcanic gabbro intrusion in the Salittu Formation within the Orijärvi area were dated by U-Th-Pb SIMS in order to provide depositional constraints on these formations.
M. Väisänen, C.L. Kirkland
doaj   +1 more source

Zircon U-Pb Dating for Paragneiss in the Xinxian Area in the Dabie–Sulu Orogenic Belt and Its Geochemical Characteristics

Frontiers in Earth Science, 2022
In order to understand the subduction of the Yangtze block and its collision with the North China Craton, we performed the elements analysis and zircon U-Pb dating on paragneiss from Xinxian area, which located along the west edge of the Dabie-Sulu ...
Zhu Shaogong, Liang Yingjie, Liang Yingjie, Zhang Yuquan, Li Zian   +4 more
doaj   +1 more source

Van Canh Triassic granite in the Kontum Massif, central Vietnam: Geochemistry, geochronology, and tectonic implications

Journal of Asian Earth Sciences: X, 2022
The Kontum Massif, located in central Vietnam, played an essential role in the evolution of Indochina and its adjacent areas. The Van Canh granites, exposed throughout the Southern Kontum Massif, display SiO2 contents ranging from 65.82 to 75.35 wt%, and
Doan Dinh Hung, Yukiyasu Tsutsumi, Pham Trung Hieu, Nguyen Trung Minh, Pham Minh, Nguyen Thi Dung, Nguyen Ba Hung, Toshifumi Komatsu, Nguyen Hoang, Kenta Kawaguchi   +9 more
doaj   +1 more source