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Variability over time in the sources of South Portuguese Zone turbidites: evide...

Pereira, Manuel Francisco; Ribeiro, Carlos; Vilallonga, Filipa; Chichorro, Martim; Drost, Kirsten; Silva, José Brandão; Albardeiro, Luis; Hofmann, Mandy

This study combines geochemical and geochronological data in order to decipher the provenance of Carboniferous turbidites from the South Portuguese Zone (SW Iberia). Major and trace elements of 25 samples of graywackes and mudstones from the Mértola (Visean), Mira (Serpukhovian), and Brejeira (Moscovian) Formations were analyzed, and 363 U-Pb ages were obtained on detrital zircons from five samples of graywacke...

Data: 2013 | Origem: Repositório Científico da Universidade de Évora

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Sedimentary provenance of Neogene strata from the SW Portuguese coast (Sines Ca...

Albardeiro, Luis; Pereira, M. Francisco; Gama, Cristina; Chichorro, Martim; Hofmann, Mandy; Linnemann, Ulf

In this preliminary study of provenance analysis Neogene sandstones and conglomerates of the Alvalade Basin were sampled, from the sea cliffs nearby the Sines Cape (SW Portuguese Coast). Detrital zircons were extracted by conventional methods of particle size separation, magnetic and heavy liquids separation. Detrital zircons were dated by U-Pb method with LA-ICPMS. The U-Pb geochronology results indicate as po...

Data: 2013 | Origem: Repositório Científico da Universidade de Évora

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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, Luís

This 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 ...

Data: 2013 | Origem: Repositório Científico da Universidade de Évora

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Early Cambrian granitoids of North Gondwana margin in the transition from a con...

Sánchez-García, Teresa; Pereira, M. Francisco; Bellido, F.; Chichorro, Martím A.; Silva, J. Brandão; Valverde-Vaquero, P.; Pin, Ch.; Solá, Ana Rita

Two distinct Cambrian magmatic pulses are recognized in the Ossa-Morena Zone (SW Iberia): an early rift-(ER) and a main rift-related event. This Cambrian magmatism is related to intra-continental rifting of North Gondwana that is thought to have culminated in the opening of the Rheic Ocean in Lower Ordovician times. New data of whole-rock geochemistry (19 samples), Sm–Nd–Sr isotopes (4 samples) and ID–TIMS U...