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Variability over time in the sources of South Portuguese Zone turbidites: evide...
Pereira, M Francisco; Ribeiro, C; Vilallonga, F; Chichorro, M; Drost, K; Albardeiro, L; Hofmann, M; Linnemann, UThis study combines geochemical and geo- chronological 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 Me´rtola (Visean), Mira (Serpukhovian), and Brejeira (Moscovian) Forma- tions were analyzed, and 363 U-Pb ages were obtained on detrital zircons from five samples of gray...
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 ...
The missing Rheic Ocean magmatic arcs: Provenance analysis of Late Paleozoic
Pereira, M.F.; Chichorro, M.; Johnston, S.T.; Gutierrez-Alonso, G.; Silva, J.B.; Linnemann, U.; Hofmann, M.; Drost, K.Early Carboniferous turbiditic sedimentary rocks in synorogenic basins located on both sides of the Rheic suture in SW Iberiawere studied for provenance analysis. An enigmatic feature of this suture, which resulted from closure of the Rheic Ocean with the amalgamation of Pangea in the Late Carboniferous, is that there are no recognizable mid- to Late Devonian subduction-related magmatic rocks,which should have ...
The provenance of Late Ediacaran and Early Ordovician siliciclastic rocks in th...
Pereira, M.F.; Linnemann, U.; Hofmann, M.; Chichorro, M.; Solá, A.R; Medina, J.; Silva, J.B.U–Pb geochronology of detrital zircon from Late Ediacaran (Beiras Group greywackes) and Early Ordovician (Sarnelhas arkosic quartzites and Armorican quartzites of Penacova) sedimentary rocks of the southwest Central Iberian Zone (SW CIZ) constrain the evolution of northern Gondwana activepassive margin transition. The LAICPMS U–Pb data set (375 detrital zircons with 90–110% concordant ages) is dominated by Neop...
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