5 documents found, page 1 of 1
Estudo geocronológico das unidades metassedimentares do soco Pré-Mesozoico a Oe...
Carvalho, Diogo; Bento dos Santos, Telmo; Chichorro, Martim; Cachapuz, Pedro; Solá, Rita; Dantas, Elton; Romão, José; Moreira, NoelTo the west of the Porto-Tomar Shear Zone, several pre-Mesozoic metasedimentary outcrops belonging to the basement of the Lusitanian Basin are poorly exposed. The traditional view suggests that these units belong to Ossa Morena Zone (OMZ), while more recent models propose the existence of the Finisterra Terrane (TF), considered exotic relative to the Iberian Massif (Moreira et al., 2019). To better constrain th...
Geochronological data for the Pre-Mesozoic basement located west of the Porto-T...
Bento dos Santos, Telmo; Chichorro, Martim; Carvalho, Diogo; Cachapuz, Pedro; Solá, Rita; Dantas, E.; Romão, José; Moreira, Noel; Dias da Silva, ÍcaroGeochronological data from the pre-Mesozoic basement of the Lusitanian Basement (West of the Porto-Tomar Fault) was obtained. Results show a predominant Cadomian/Pan-African and Eburnean inheritance/source, placing this sector as a peri-Gondwanan domain. However, two major differences can be seen in the data: samples with a clear absence in Mesoproterozoic ages vs. samples with a clear presence of these ages an...
Provenance analysis of the Late Ediacaran basins from SW Iberia (Serie Negra Su...
Chichorro, Martin; Solá, Rita; Pereira, Manuel Francisco; Hofmann, M.; Linnemann, U.; Gerdes, A.; Medina, Jorge; Lopes, LuísThis study makes a comparison of the populations of detrital zircon from Late Ediacaran greywackes of the Ossa-Morena Zone (OMZ) and the southern domains of the Central Iberian Zone (S-CIZ). The results obtained reveal that the main difference between the age spectra of both populations of detrital zircon is the Neoproterozoic, in particularly the Cryogenian grains. Our new data suggest that deposition in both ...
Provenance of Cambro-Ordovician siliciclastic rocks of the SW Iberia: insights ...
Solá, Rita; Chichorro, Martim; Pereira, Manuel Francisco; Hofmann, M.; Linnemann, U.; Gerdes, A.; Medina, Jorge; Lopes, LuísThis study makes a comparison between the populations of detrital zircon of the Cambrian sandstones from the Ossa-Morena Zone (OMZ) and the Ordovician quartzites from the southern domains of the Central Iberian Zone (S-CIZ) in order to identify the sources during development of North Gondwana basins (SW Iberia). The U-Pb results obtained for the Lower Cambrian sandstones of the OMZ show a remarkable similarity ...
New geochemical and geochronological data of early Cambrian of (SW Iberia): Cal...
Sanchez-Garcia, Teresa; Pereira, M. Francisco; Bellido, Felix; Chichorro, Martim; Silva, J. Brandao; Valverde-Vaquero, Pablo; Pin, Christian; Solá, RitaThe Ossa-Morena Zone (SW Iberia) displays a well-preserved record of the history of the northern Gondwana margin in Late Ediacaran-Early Cambrian times. This period of time is marked by the late-stage evolution of the Cadomian magmatic arc and related back-arc basins (c. 590-545 Ma), and the onset of rifting and widespread magmatism (c. 530-500 Ma) that led to the opening of the Rheic Ocean. Here we present new...