Results 261 to 270 of about 165,337 (293)

Ediacaran–Cambrian paleogeography and geodynamic setting of the Central Iberian Zone: Constraints from coupled U–Pb–Hf isotopes of detrital zircons

Precambrian Research, 2015
David Orejana, E Merino Martinez, CARLOS Villaseca   +2 more
exaly   +2 more sources

Lower Paleozoic rifting event in Central Iberian Zone (central-north Portugal): Evidence from elemental and isotopic geochemistry of metabasic rocks

, 2021
The occurrence of Lower Paleozoic mafic magmatic rocks in the Central Iberian Zone (CIZ) of the Variscan Orogen is rare. Amphibolites and metagabbros embedded in the metasediments of the Douro-Beiras Supergroup outcrop at Farminhao, Viseu (central-north ...
B. Cotrim, T. B. D. Santos, J. Mata, M. Benoit, A. Jesus   +4 more
semanticscholar   +1 more source

Revised biochronology of the Lower Cambrian of the Central Iberian zone, southern Iberian massif, Spain

Geological Magazine, 2010
AbstractTrilobites from the upper unit of the Lower Cambrian Pusa Formation (south-central Spain) substantially antedate other Iberian trilobites, according to widely published correlation schemes, and arguably would be among the earliest trilobites globally.
Jensen, Rolf Sören, Palacios Medrano, Teodoro, Martí Mus, Mónica   +2 more
openaire   +2 more sources

Cadomian orogenic collapse in the Ibor and Alcudia anticlines of the Central Iberian Zone, Spain

Geological Magazine, 2021
In the Central Iberian Zone, the Cadomian orogenic collapse is represented by chaotic megabreccias, olistostromes and mélange deposits reflecting a drastic change from slope-related deposits, fed by denudation of the Cadomian arc, to offshore-dominant ...
J. Álvaro, S. Lorenzo
semanticscholar   +1 more source

The basal Cambrian carbon isotope excursion revealed in the Central Iberian Zone, Spain

Precambrian Research
The causes of early metazoan diversification during the Ediacaran-Cambrian transition interval are controversial, partly because the global correlation of the Ediacaran-Cambrian boundary remains problematic due to a lack of unambiguous stratigraphic ...
Kun Zhang, Graham A. Shields, Ying Zhou, H. Strauss, Ulrich Struck, Sören Jensen   +5 more
semanticscholar   +1 more source

Variscan tectonic evolution, magnetic anomalies and metallogenetic potential in the western Central Iberian Zone (Iberian Massif)

2023
The Iberian Massif presents a complex Late Paleozoic evolution, with intense compressional tectonics followed by gravitational collapse of the thickened crust and orocline development. In NW Iberia, extensional detachments and associated shear zones developed during high temperature-low pressure metamorphism in relation to partial melting in gneiss ...
Irene Pérez Cáceres, Irene DeFelipe, Puy Ayarza, Juan Gómez Barreiro, Helena Sant’Ovaia, Cláudia Cruz, Maria dos Anjos Ribeiro, Juan José Villalaín, Manuela Durán Oreja, José Ramón Martínez Catalán   +9 more
openaire   +1 more source

Petrogenesis and U–Pb Dating of Variscan S-Type Granites from the Junqueira Batholith (Central Iberian Zone)

Minerals
The Junqueira massif is a syn- to late-kinematic Variscan batholith intruded into Ediacaran-Cambrian metasedimentary rocks of the Douro-Beiras Supergroup (DBSG) in the Central Iberian Zone.
L. Portela, Maria do Rosário Azevedo, Beatriz Valle Aguado, M. M. Costa, J. Medina   +4 more
semanticscholar   +1 more source

First Insights into the Crystallization Conditions of the Belvís de Monroy Granite-Pegmatite System (Central Iberian Zone, Spain)

The Canadian Journal of Mineralogy and Petrology
The Belvís de Monroy granite-pegmatite system (Cáceres, Spain) is located in the Central Iberian Zone and intrudes the Schist-Graywacke Complex between the Belvís de Monroy granite-pegmatite system and the Navalmoral de la Mata granites.
Nora Santos-Loyola, E. Roda-Robles, I. Garate-Olave, Enrique Merino-Martínez, Jon Errandonea-Martin   +4 more
semanticscholar   +1 more source

Insights into petrogenesis of the Jálama pluton (Central Iberian Zone, western Spain)

International Geology Review, 2018
ABSTRACTThe Jalama pluton (JP) is a Variscan peraluminous granitoid that intruded into low-grade metasediments from the Central Iberian Zone (CIZ). It comprises a sillimanite-bearing two-mica monzogranite in the inner zone, followed by a tourmaline-bearing two-mica monzogranite, and a marginal tourmaline-muscovite leucogranite in the northern half of ...
A. Pesquera, P. Gil-Crespo, José M. Torres-Ruiz, E. Roda-Robles   +3 more
semanticscholar   +2 more sources

Zircon U--Pb geochronology and Sr-Nd-O isotopic constraints on the petrogenesis of the Jálama pluton (Central Iberian Zone, Spain)

, 2021
In this paper we report a combined zircon U–Pb–O isotopes and bulk-rock Sr–Nd–O isotopes study on granitic rocks from the Jalama pluton, Central Iberian Zone. Zircon U--Pb ages of representative granitic rock samples are bracketed in the range of 306–304 
A. Pesquera, P. Montero, P. Gil-Crespo
semanticscholar   +1 more source