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Publication details

Document type
Journal articles

Document subtype
Full paper

Title
The Odivelas Palaeozoic volcano-sedimentary sequence: Implications for the geology of the Ossa-Morena Southwestern border (A sequência vulcano-sedimentar paleozóica de Odivelas: Implicações para a geologia do limite Sudoeste da Zona de Ossa-Morena)

Participants in the publication
Moreira N. (Author)
Machado G. (Author)
Fonseca P. E. (Author)
Silva J. C. (Author)
Jorge R.C.G.S. (Author)
Dep. Geologia
 CREMINER
 IDL
 Mata J. (Author)

Summary
We present a preliminary characterization of the structure, stratigraphy and petrography of a sequence including the Odivelas Limestone near Covas Ruivas locality (Ossa-Morena Zone, Évora-Beja Domain). In this area, limestone and tuffites occur spatially associated with mafic meta-volcanic rocks presenting mineral parageneses typical of low grade metamorphism (greenschists facies) and with the occasional occurrence of silica iron exhalites (jaspers). Previous work dated the limestones at this locality as latest Emsian early mid Eifelian. As indicated by folded and brittle structures, this Devonian sequence was affected by two Variscan deformation phases, which where individualized, related with regional orogenic D2 and D3 phases. The structural data indicate that the Odivelas Limestone stratigraphically overlays the metavolcanic rocks, although de contact between them was tectonically affected by a thrusting and/or shearing. Considering age assigned to the Odivelas Limestone and the fact that the effects of the regional D1 are not visible in the studied area one can consider that, in this region, D1 is pre-latest Emsian, i.e., Lower Devonian or older.

Date of Publication
2010

Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Where published
Comunicacoes Geologicas

Publication Identifiers
ISSN - 0873948X

Volume
97
Number
1

Starting page
129
Last page
146


Export

APA
Moreira N., Machado G., Fonseca P. E., Silva J. C., Jorge R.C.G.S., Mata J., (2010). The Odivelas Palaeozoic volcano-sedimentary sequence: Implications for the geology of the Ossa-Morena Southwestern border (A sequência vulcano-sedimentar paleozóica de Odivelas: Implicações para a geologia do limite Sudoeste da Zona de Ossa-Morena). Comunicacoes Geologicas, 97, 129-146. ISSN 0873948X. eISSN .

IEEE
Moreira N., Machado G., Fonseca P. E., Silva J. C., Jorge R.C.G.S., Mata J., "The Odivelas Palaeozoic volcano-sedimentary sequence: Implications for the geology of the Ossa-Morena Southwestern border (A sequência vulcano-sedimentar paleozóica de Odivelas: Implicações para a geologia do limite Sudoeste da Zona de Ossa-Morena)" in Comunicacoes Geologicas, vol. 97, pp. 129-146, 2010.

BIBTEX
@article{39443, author = {Moreira N. and Machado G. and Fonseca P. E. and Silva J. C. and Jorge R.C.G.S. and Mata J.}, title = {The Odivelas Palaeozoic volcano-sedimentary sequence: Implications for the geology of the Ossa-Morena Southwestern border (A sequência vulcano-sedimentar paleozóica de Odivelas: Implicações para a geologia do limite Sudoeste da Zona de Ossa-Morena)}, journal = {Comunicacoes Geologicas}, year = 2010, pages = {129-146}, volume = 97 }