4 documents found, page 1 of 1
Strain partitioning in transpression; a major feature in the evolution of the I...
Dias, Rui; Araújo, Alexandre; Couto, Helena; Cruz, Cláudia; Ferreira, Joana; Gonçalves, Ana Marta; Lima, Alexandre; Lopes, Luís; Moreira, NoelAs the wavy pattern of fold belts is a common feature, since its recognition, the transpressive regimes were expected to be a pervasive mechanism on their evolution. Nevertheless, even in regions where oblique shortening is inferred, typical structures of transpression (e.g. transected cleavage and en echelon folds, shear or veins) are often absent. Instead, what is frequently observed is the juxtaposition of n...
Ordovician–Silurian transition in the Central-Iberian Zone: Just a stratigraphi...
Tereso, Vitor; Dias, Rui; Roseiro, José; Romão, José; Coke, Carlos; Fonseca, Rita; Ribeiro, AntónioABSTRACT: The Ordovician-Silurian boundary in the Central-Iberian Zone is often considered a normal stratigraphic transition. Nevertheless, in studies carried out in Portugal (e.g. Espinhosela, São Mamede and Buçaco areas) and Spain (e.g. Alcañices Synform) this contact is marked by the development of shear zones subparallel to the lithostratigraphic units. Ongoing structural mapping in Celorico de Basto (Marão...
Variscan inversion of a Silurian basin: The role of preexisting features on she...
Tereso, Vitor; Dias, Rui; Roseiro, José; Romão, JoséIt is of broad consensus that during Silurian times the seawater anoxia-euxinia levels were enhanced, particularly from the mid Llandovery, often persisting until the Ludlow and Pridoli. The likely stratification of the water column, promoted by the steady Palaeozoic drift conditions, led to the accumulation of organic-rich sediments. This has been recognized throughout the whole Iberian Massif, in sedimentary ...
Ordovician – Silurian transition in the Central-Iberian Zone: Just a stratigrap...
Tereso, Vitor; Dias, Rui; Roseiro, José; Romão, José; Coke, Carlos; Fonseca, Rita; Ribeiro, AntónioThe Ordovician-Silurian boundary in the Central-Iberian Zone is often considered a normal stratigraphic transition. Nevertheless, in studies carried out in Portugal (e.g. Espinhosela, São Mamede and Buçaco areas) and Spain (e.g. Alcañices Synform) this contact is marked by the development of shear zones subparallel to the lithostratigraphic units. Ongoing structural mapping in Celorico de Basto (Marão region) s...