Results 11 to 20 of about 32,456 (106)

First evidence for the subduction initiation and boninitic magmatism from the Armutlu Peninsula (NW Turkey): geodynamic significance for the Cadomian magmatic arc system of the Gondwanan margin

International Geology Review, 2021
The Cadomian Orogeny was active along the northern margin of Gondwanaland during the Late Neoproterozoic–Early Cambrian period.
Zeynep Özbey, Özge Karslıoğlu, Namık Aysal   +2 more
semanticscholar   +6 more sources

Late Cadomian rifting of the NW Gondwana margin and the reworking of Precambrian crust – evidence from bimodal magmatism in the early Paleozoic Moroccan Meseta

International Geology Review, 2020
The Meseta Goaïda magmatism, which occurs as gabbro, dolerite and rhyolitic intrusions in the Neoproterozoic basement and Cambrian platform sedimentary series of the Moroccan Hercynian orogen, has been ascribed to the Variscan orogenesis in the late Palaeozoic. Here, we provide new LA–ICP-MS U-Pb zircon ages – ranging from c. 519 Ma to c.
Muhammad Ouabid, Carlos J. Garrido, Houssa Ouali, Jason Harvey, Károly Hidas, Claudio Marchesi, Antonio Acosta-Vigil, Jean‐Marie Dautria, Hicham El Messbahi, Manuel Jesús Román-Alpiste   +9 more
semanticscholar   +6 more sources

Repeated magmatic buildup and deep “hot zones” in continental evolution: The Cadomian crust of Iran [PDF]

Earth and Planetary Science Letters, 2020
Abstract The generation and differentiation of continental crust by arc magmatism is strongly influenced by episodes of high magmatic flux (“flare-ups”). Magmatic flare-ups encourage the development of deep crustal hot zones where magmatic differentiation and density stratification combine to form the upper felsic and lower mafic continental crust ...
Hadi Shafaii Moghadam, Q.L. Li, W.L. Griffin, R.J. Stern, O. Ishizuka, H. Henry, F. Lucci, S.Y. O'Reilly, G. Ghorbani   +8 more
semanticscholar   +7 more sources

Crustal Evolution of NW Iran: Cadomian Arcs, Archean Fragments and the Cenozoic Magmatic Flare-Up [PDF]

Journal of Petrology, 2017
The Cadomian orogen of NW Iran includes a series of metamorphic rocks with zircon U-Pb ages between ca 562 and 505 Ma (Ediacaran to middle Cambrian). The Ediacaran-Cambrian basement is intruded by a series of Late Eocene-Late Oligocene I-type granitic rocks.
Hadi Shafaii Moghadam, William L Griffin, Xian-Hua Li, Jose F Santos, Orhan Karsli, Robert J Stern, Ghasem Ghorbani, Sarah Gain, Rosanna Murphy, Suzanne Y O’Reilly   +9 more
core   +5 more sources

U–Pb zircon ages (SHRIMP) for Cadomian and Early Ordovician magmatism in the Eastern Pyrenees: New insights into the pre-Variscan evolution of the northern Gondwana margin

Tectonophysics, 2008
New geochronological data from low- to medium-grade metamorphic areas of the Eastern Pyrenees (Canigó, Roc de Frausa and Cap de Creus massifs) confirm the presence of two significant pre-Variscan igneous events: Ediacaran–Early Cambrian and Early ...
Pedro Castiñeiras, Montserrat Liesa, Josep M Casas   +2 more
exaly   +3 more sources

Geochemical and Isotopic Evolution of Late Oligocene Magmatism in Quchan, NE Iran

Geochemistry, Geophysics, Geosystems, 2021
Magmatic activity that accompanied the collision between Arabia and Eurasia at ∼27 Ma, provides unique opportunities for understanding the triggers and magma reservoirs for collisional magmatism and its different styles in magmatic fronts and back‐arcs ...
H. S. Moghadam, Q. L. Li, M. Kirchenbaur, D. Garbe‐Schönberg, F. Lucci, W. L. Griffin, G. Ghorbani   +6 more
doaj   +3 more sources

Cadomian magmatism and metamorphism at the Ossa Morena/Central Iberian zone boundary, Iberian Massif, Central Portugal: Geochemistry and P–T constraints of the Sardoal Complex [PDF]

, 2017
A well preserved Cadomian basement is exposed in the Iberian Massif, Central Portugal, at the Ossa Morena/Central Iberian zone boundary, which allows the determination of reliable geochemical data.
S. Henriques, A. Neiva, L. Tajčmanová, G. Dunning   +3 more
semanticscholar   +2 more sources

Evidence for a “Cadomian” ophiolite and magmatic-arc complex in SW Bulgaria

Precambrian Research, 2012
Abstract New geochronological and geochemical data from the magmatic rocks of the Kraishte area (SW Bulgaria) reveal the existence of Cadomian arc magmatism intruding an ophiolitic complex. Similar geochemical signatures and crystallization ages of the basic to acidic rocks of the Struma Unit and the Osogovo–Lisets Complex suggest that these rocks ...
Kounov, A., Graf, J., von Quadt, A., Bernoulli, D., Burg, J.-P., Seward, D., Ivanov, Z., Fanning, M.   +7 more
openaire   +3 more sources

Lower Cambrian magmatism in the SW Iberian sector of the African-Gondwana margin: Geochemical and isotopic keys to incipient tectonic switching

Geological Society Special Publication, 2023
Aspects of the evolution of the Pan-African-Cadomian arc have been recognized in several European massifs. The Ossa-Morena Complex (SW Iberian Massif) is one of the best-preserved sections of this paleo-Gondwana margin.
Esther Rojo Pérez, R. Arenas, J. M. Fuenlabrada, I. Novo‐Fernández, S. Sánchez Martínez, D. Moreno‐Martín, R. Díez Fernández   +6 more
semanticscholar   +2 more sources

Transcurrent displacement of the Cadomian magmatic arc [PDF]

Precambrian Research, 2021
The Ossa-Morena Zone in Iberia, and equivalent terranes in northern France and Central Europe, are thought to be paleogeographically linked to the West African Craton at Ediacaran to early Paleozoic times. Evidence is mainly based on metasedimentary rock detrital zircon age spectra, characterized by two dominant populations of Paleoproterozoic and ...
Azor, Antonio, Martínez Poyatos, David, Accotto, Cristina, Simancas, Fernando, González Lodeiro, Francisco, Talavera, Cristina, Evans, Noreen J.   +6 more
openaire   +2 more sources