Le silurien du synclinoriumde Moncorvo (NE du Portugal): Biostratigraphie et importance paléogéographique

Sarmiento, Graciela N.; Piçarra, José Manuel; Rebelo, José Almeida; Robardet, M.; Gutiérrez-Marco, J. C.; Štorch, Petr; Rábano, Isabel

doi:10.1016/s0016-6995(99)80062-x

Cited by 13 publications

(8 citation statements)

References 16 publications

(4 reference statements)

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“…These certainly correspond to structural repetitions of a single and close cherty interval yielding Llandovery graptolites of the Coronograptus From a palaeogeographical point of view, the Silurian rocks of the GTMZ display a moderate "Mediterranean character" (i.e. relatively minor thickness for the complete Silurian-Lower Devonian sequence, frequent lydites, and presence of limestone in the upper part) similar to that of the Moncorvo and Truchas successions of the CIZ (Sarmiento et al 1999;Gutiérrez-Marco et al 2001). This supports the parautochthonous nature formerly assigned to the "Schistose Domain".…”

Section: New Stratigraphic and Biostratigraphic Approachmentioning

confidence: 84%

Silurian graptolite biostratigraphy of the Galicia—Trás-os-Montes Zone (Spain and Portugal)

Piçarra¹,

Gutiérrez-Marco²,

Sá³

et al. 2006

GFF

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Revision and reappraisal of Silurian graptolite data occurring within the Galicia -Trás-osMontes Zone (NW Iberia) has resulted in a new stratigraphical interpretation of the entire sequence. This is relatively thin, with late Rhuddanian to mid-Telychian black cherts at the base overlain by late Telychian to early Ludfordian black shales, and ending with shales and limestones of Late Silurian age. A total of 10 graptolite biozones was firmly recognized; four others are doubtfully recognized. Palaeogeographical/biogeographical data support the parautochthonous nature formerly assigned to the Silurian succession of the "Schistose Domain", as not being a direct prolongation of the Silurian of the Central-Iberian Zone.

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Section: New Stratigraphic and Biostratigraphic Approachmentioning

confidence: 84%

Silurian graptolite biostratigraphy of the Galicia—Trás-os-Montes Zone (Spain and Portugal)

Piçarra¹,

Gutiérrez-Marco²,

Sá³

et al. 2006

GFF

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“…3; e.g., Helbing and Tiepolo, 2005;Martínez Catalán et al 1992;Gutiérrez-Marco 2001;Dias da Silva et al 2010. The deposition of low-energy condensed facies following fine-grained and pelitic sediments characterizes a new subsidence cycle in the continental platform by the latest Ordovician-Silurian transition (Gutiérrez-Marco et al 1998;Sarmiento et al 1998;Piçarra et al 2006). The UP and CIZ both feature voluminous bimodal magmatism during the lower Paleozoic (Figs.…”

Section: Geological Settingmentioning

confidence: 99%

Magmatic evolution in the N-Gondwana margin related to the opening of the Rheic Ocean—evidence from the Upper Parautochthon of the Galicia-Trás-os-Montes Zone and from the Central Iberian Zone (NW Iberian Massif)

Silva

Fernández

Montes

et al. 2015

Int J Earth Sci (Geol Rundsch)

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“…Locally towards the top, small lenses of dark limestones yielding Pridolian–Lockhovian fauna occur in Portugal (Sarmiento et al . 1999).…”

Section: Outline Of the Formations Sampledmentioning

confidence: 99%

Relationships between syn-orogenic sedimentation and nappe emplacement in the hinterland of the Variscan belt in NW Iberia deduced from detrital zircons

et al. 2015

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Flysch-type, syn-orogenic deposits of Carboniferous age occur in relation to the emplacement of a large allochthonous nappe stack in the Variscan belt of NW Iberia. New U-Pb age populations of detrital zircons obtained using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) are considered together with others from previously dated samples to establish the relationships between sedimentation and thrusting. The age populations of four syn-orogenic formations are compared with those of the pre-orogenic sequence in the Autochthon and Parautochthon, representing the Gondwanan passive margin, and in the Allochthon, formed by peri-Gondwanan and oceanic terranes. In addition, a new structural study has been carried out to understand the relationships between the syn-orogenic deposits and the development of Variscan structures. The aims are to identify the sources of sediments and to establish the relationship between Variscan structural evolution and syn-orogenic sedimentation. Development of a forebulge outwards from the allochthonous front, deduced from the structural study, suggests the existence of depocentres that hosted the syn-orogenic sediments. Together with the trend shown by the more recent zircons in each formation, that are younger towards the external zones, the data suggest that sedimentation occurred in progressively migrating depocentres formed in front of the allochthonous wedge during its emplacement. The zircon age populations point to the Allochthon as the main source of detritus for the syn-orogenic basins, with perhaps a limited participation of the Parautochthon and Autochthon in the younger formations.

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Le silurien du synclinoriumde Moncorvo (NE du Portugal): Biostratigraphie et importance paléogéographique

Cited by 13 publications

References 16 publications

Silurian graptolite biostratigraphy of the Galicia—Trás-os-Montes Zone (Spain and Portugal)

Silurian graptolite biostratigraphy of the Galicia—Trás-os-Montes Zone (Spain and Portugal)

Magmatic evolution in the N-Gondwana margin related to the opening of the Rheic Ocean—evidence from the Upper Parautochthon of the Galicia-Trás-os-Montes Zone and from the Central Iberian Zone (NW Iberian Massif)

Relationships between syn-orogenic sedimentation and nappe emplacement in the hinterland of the Variscan belt in NW Iberia deduced from detrital zircons

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