4 documents found, page 1 of 1
Birth and demise of the Rheic Ocean magmatic arc(s): Combined U–Pb and Hf isoto...
Pereira, Manuel Francisco; Gutierrez-Alonso, Gabriel; Murphy, J. Brendan; Drost, Kerstin; Gama, Cristina; Silva, J. BrandãoPaleozoic continental reconstructions indicate that subduction of Rheic oceanic lithosphere led to collision be- tween Laurussia and Gondwanawhich was a major event in the formation of the Ouachita-Appalachian-Variscan orogenic belt and the amalgamation of Pangea. However, arc systems which record Rheic Ocean subduction are poorly preserved. The preservation of Devonian detrital zircon in Late Devonian–Early Ca...
Evidence formulti-cycle sedimentation and provenance constraints from
Pereira, M. Francisco; Gama, Cristina; Chichorro, Martim; Silva, Jose B.; Gutierrez-Alonso, Gabriel; Hofmann, Mandy; Linnemann, Ulf; Gartner, AndyLaser ablation ICP-MS U–Pb analyses were conducted on detrital zircons of Triassic sandstone and conglomerate from the Lusitanian basin in order to: i) document the age spectra of detrital zircon; ii) compare U–Pb detrital zircon ages with previous published data obtained from Upper Carboniferous, Ordovician, Cambrian and Ediacaran sedimentary rocks of the pre-Mesozoic basement of western Iberia; iii) discuss p...
Sedimentary record of the amalgamation and break-up of Pangaea: U-Pb detrital z...
Pereira, M. Francisco; Chichorro, Martim; Gutierrez-Alonso, Gabriel; Gama, Cristina; Drost, Kerstin; Ribeiro, Carlos; Albardeiro, Luis; Hofmann, MandyIn SW Iberia there is a basal unconformity where Triassic sandstones overlie previously deformed Carboniferous turbidites. This important stratigraphic boundary records the transition from the final stages of Pangaea’s amalgamation to the initial stages of break-up. U-Pb dating of detrital zircon from Carboniferous greywackes of the South Portuguese Zone and Triassic sandstones of the Algarve and Alentejo basin...
Detrital zircon age constraints on the sediment provenance of Variscan basins i...
Pereira, M. Francisco; Chichorro, Martim; Johnston, Stephen; Gutierrez-Alonso, Gabriel; Silva, J. Brandão; Linnemann, Ulf; Hofmann, MandyThe mid- to late-Devonian Rheic suture between the Laurussia and Gondwana blocks that combined to form Pangea, can be traced along the Variscan orogenic belt across Western-Central Europe. In southwest Iberia, there are, however, no magmatic arc rocks that can be related to the closure, by subduction of its oceanic lithosphere, of the Rheic Ocean. The only magmatism recorded on both sides of the suture is of ea...