Results 181 to 190 of about 1,932 (208)

Geodynamic Evolution of the Iberian Massif

1990
The Iberian Massif represents the largest continuous exposure of pre-Permian rocks within the Iberian Peninsula (Fig. 1). It was first described in terms of a coherent tectonic unit by Staub (1926) who considered it to be comprised of Archean basement sequences that had been successively reworked during Caledonian and Herycnian orogenic events. Stille (
A Ribeiro, C Quesada, R D Dallmeyer
exaly   +2 more sources

The structure of a major suture zone in the SW Iberian Massif: the Ossa-Morena/Central Iberian contact

Tectonophysics, 2001
Abstract We have investigated the stratigraphy, structure and metamorphism of the boundary between the Ossa Morena Zone (OMZ) and the Central Iberian Zone (CIZ), two significant continental portions of the Variscan Iberian Massif. The OMZ/CIZ contact is marked by a strongly deformed and metamorphosed NW–SE trending narrow band, namely, the Central ...
David Martinez Poyatos, I Exposito, Antonio Azor   +2 more
exaly   +2 more sources

Some aspects of paleoweathering in the Iberian Hercynian Massif

CATENA, 1990
Summary The Iberian Hercynian Massif occupies most of the western half of the Iberian Perninsula and forms the basement over which Mesozoic, Cenozoic and Quaternary materials rest unconformably. Over it can be found remains of weathering profiles that are fossilized by marine and/or continental sediments of different ages.
E. Molina, M. Cantano, P. Garcia Rodriguez, M.A. Vicente   +3 more
openaire   +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

Geochemistry and EPR of cassiterites from the Iberian Hercynian Massif

Mineralogical Magazine, 1997
AbstractThis paper is based on microprobe analysis (Ta, Nb, Fe, Mn, Ti, W, Sn) and Fe3+ EPR spectra of cassiterite samples from 14 tin deposits from the Iberian Hercynian Massif. The interpretation of microprobe data, atomic ratios (Fe+Mn)/(Nb+Ta), and Fe3+ EPR spectra reveal that the coupled substitution: 3Sn4+ = (Fe,Mn)2+ + 2(Nb,Ta)5+ is dominant in ...
A. Murciego, A. Garcla Sanchez, Y. Dusausoy, J. M. Martin Pozas, R. Ruck   +4 more
openaire   +1 more source

Combined zircon U Pb and Lu Hf isotopes study of magmatism and high-P metamorphism of the basal allochthonous units in the SW Iberian Massif (Ossa-Morena complex)

Lithos, 2018
UPb and LuHf isotope ratios measured in zircon crystals from magmatic and metamorphic rocks provide crucial information to understand the origin and tectonothermal evolution of allochthonous terranes, and can contribute to paleogeographic reconstructions
Jacobo Abati, Ricardo Arenas
exaly   +2 more sources

Comparative study of the Lower Ordovician ironstones of the Iberian Massif (Zamora, Spain) and of the Armorican Massif (central Brittany, France)

Journal of Sedimentary Research, 1998
ABSTRACT The Lower Ordovician ironstones of the Iberian Massif (Zamora) and of the Armorican Massif (central Brittany) occur in units of varying thickness (0.2-2.5 m). They are interstratified in mainly sandy formations, with numerous sedimentary structures and trace fossils showing that they were deposited in a nearshore environment (intertidal or ...
Fernandez, A., Chauvel, Jean-Jacques, Candelas, Moro   +2 more
openaire   +3 more sources

The Cadomian orogeny in the Iberian Massif revisited

Geological Society, London, Special Publications
The exposed basement of the Variscan Iberian Massif includes various remains of the accretionary Cadomian orogen that fringed the northwestern margin of Gondwana in the late Neoproterozoic–Terreneuvian. Subduction of the Mirovoi Ocean beneath Gondwana was responsible for the formation of an arc system that was finally accreted to the continental margin.
J. Javier Álvaro, Cecilio Quesada
openaire   +1 more source

The Iberian Massif

1984
The most outstanding feature of the Iberian Peninsula is the vast remnant of the Hercynian continent, variously called the Hesperic massif by Hernandez-Pacheco (1932a), the Iberian massif by Lautensach and Mayer (1961) or the Meseta block by Sole-Sabaris (1952): This last term is not to be confused with the physiographic term used for the Castilian ...
openaire   +1 more source

Block Streams in the Tremedal Massif, Central Iberian Chain

2014
The Tremedal Massif is an inlier of Paleozoic rocks that protrudes around 300 m over an extensive planation surface cut across Mesozoic formations. It reaches 1,920 m a.s.l. at Caimodorro and has a continental climate characterised by a large number of days with minimum temperatures below freezing point (80–100 days per year).
Mateo Gutiérrez, Francisco Gutiérrez
openaire   +1 more source