Results 81 to 90 of about 32,456 (106)

The northern Ossa-Morena Cadomian batholith (Iberian Massif): magmatic arc origin and early evolution

International Journal of Earth Sciences, 2004
Diorites and related rocks in the Merida area of northern Ossa-Morena (SW Iberia) are intrusive into Precambrian metavolcanic and metasedimentary sequences. Cumulate products from the H2O-rich magmas are amphibole-rich gabbros to hornblendites. Major and trace element compositions, including Sr and Nd isotope data, allow the definition of a calc ...
A. Bandr�s, L. Egu�luz, C. Pin, J. L. Paquette, B. Ord��ez, B. Le F�vre, L. A. Ortega, J. I. Gil Ibarguchi   +7 more
openaire   +1 more source

Cadomian (ca. 550 Ma) magmatic and thermal imprint on the North Arabian-Nubian Shield (south and central Israel): New age and isotopic constraints

, 2020
The Arabian-Nubian Shield (ANS) is a province of mostly juvenile Neoproterozoic continental crust in NE Africa and Arabia, forming the northern extension of the East-African orogen.
A. Abbo, D. Avigad, A. Gerdes, N. Morag, S. Vainer   +4 more
semanticscholar   +1 more source

Tectono-magmatic and kinematic evolution of the Africa-Europe plate boundary: from Cadomian subduction to Western Mediterranean tectonics

2023
Processes driving orogenic styles and long-term isostatic versus dynamic support of the topography have been largely debated in domains of plate convergence. The tectonic evolution of orogens reflect the interactions between mantle flow driving plates and the inherited rheology and composition of moving plates.
Frédéric Mouthereau, Paul Angrand
openaire   +1 more source

Geochronology and Geochemistry of Ediacaran A‐Type Granitoids From Central Iran: Post‐Collisional Magmatism During the Final Stages of the Cadomian Orogeny

Geological Journal
The late Cadomian magmatic evolution of the Central East Iranian Microcontinent (CEIM) remains a critical yet debated aspect of northern Gondwana tectonics.
Neda Tavakoli, Yunpeng Dong, Bo Hui, Mohamed Attia, A. Davoudian, Nahid Shabanian, Shengsi Sun   +6 more
semanticscholar   +1 more source

Mid-Ediacaran bimodal magmatism and peri-Baltic affinity of the Brunovistulian terrane documented by the U-Pb isotope and palaeomagnetic data from the Brno Massif (Central Europe)

, 2021
Palaeomagnetic and isotope (U-Pb, 40Ar-Ar39) studies were conducted in the area of the Brno Massif (Central Europe). The basaltic and granitic dykes, so far regarded as Silurian, were sampled in four localities.
J. Nawrocki, J. Leichmann, M. Pańczyk
semanticscholar   +1 more source

New constraints from detrital zircon ages on prolonged, multiphase transition from the Cadomian accretionary orogen to a passive margin of Gondwana

Precambrian Research, 2018
The Avalonian–Cadomian belt formed as a collage of accretionary complexes, island arcs, and sedimentary basins along the northern margin of Gondwana during the Neoproterozoic times.
J. Hajná, J. Žák, W. Dörr, V. Kachlík, J. Sláma   +4 more
semanticscholar   +1 more source

U-Pb Zircon Age Constraints on the Paleozoic Sedimentation, Magmatism and Metamorphism of the Sredogriv Metamorphics, Western Balkan Zone, NW Bulgaria

Géosciences
The Sredogriv greenschist facies rocks belong to the Western Balkan Zone in northwestern Bulgaria. The low-grade rocks consist of clastic-tuffaceous precursors and presumably olistostromic magmatic bodies. We present U-Pb LA-ICP-MS zircon age constraints
N. Bonev, P. Filipov, Tsvetomila Vladinova, Tanya Stoylkova, Hristiana Georgieva, Svetoslav Georgiev, Hristo Kiselinov, Lyubomirka Macheva   +7 more
semanticscholar   +1 more source

Zircon U–Pb evidence for the extent of the Meguma terrane and late Ediacaran magmatism in offshore Nova Scotia, Canada

Atlantic Geoscience
A U–Pb LA-ICP-MS zircon study was conducted on 22 rock samples from offshore southeastern Nova Scotia, Canada, to investigate the nature of the pre-Mesozoic basement and the provenance of the overlying syn-rift Late Triassic Eurydice Formation of the ...
Rémi Germain, Y. Kuiper, Shawna E. White, James L. Crowley   +3 more
semanticscholar   +1 more source

Zircon and apatite U-Pb geochronology of the Paleoproterozoic (Eburnean) basement and late Neoproterozoic (Pan-African) metamorphism and magmatism from Port-Béni, Armorican Massif (France)

BSGF - Earth Sciences Bulletin
By re-examining the historical outcrops of Port-Béni located in the Trégor unit of the North Armorican Cadomian belt, the present work delivers four new ages that provide additional constraints on the Proterozoic history of northern Brittany.
Marc Poujol, E. Hallot, Baptiste Abiven, Aymeric Poulizac   +3 more
semanticscholar   +1 more source

Cadomian magmatism in the Alps recorded in Late Ordovician sandstones of the Carnic Alps : preliminary results from zircon Pb/Pb evaporation dating

Schweizerische Mineralogische und Petrographische Mitteilungen: eine europäische Zeitschrift für Mineralogie, Geochemie und Petrographie, 2001
207Pb/206Pb evaporation age dating of euhedral detrital zircons from the Late Ordovician Uggwa Formation, eastern Carnic Alps, yields two age groups, including (1) a group with a pooled age of 650 ± 24 Ma and (2) a bad constrained age group of 518 ± 76 to 533 ± 106 Ma.
Neubauer, Franz M., Kloetzli, Urs, Poscheschnik, P.   +2 more
openaire   +2 more sources