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Publication details

Document type
Journal articles

Document subtype
Full paper

Title
Age of the basement beneath the Mesozoic Lusitanian Basin revealed by granitic xenoliths from the Papôa volcanic breccia (West Iberia)

Participants in the publication
M.F. Pereira (Author)
C. Gama (Author)
J.B. Silva (Author)
Dep. Geologia
 IDL
 Í. Dias da Silva (Author)
Dep. Geologia
 IDL
 IDL
Summary
The dyke of the Papôa volcanic breccia cross-cutting the Lower Jurassic sequence of the Lusitanian Basin (West Iberia) contains granitic xenoliths. In this study, for the first time, U-Th-Pb zircon analysis of two xenoliths yielded 298±4Ma for biotite granite and of 292±2Ma for two-mica granite, indicating that the pre-Mesozoic basement of the Lusitanian Basin includes Permian intrusions. These ages are close within the margin of error of the age of the Late Carboniferous granites of the Berlengas isle that with the Late Devonian high-grade metamorphic rocks of the Farilhões isles, located northwest of the study area, which form the pre-Mesozoic basement of the Lusitanian Basin. These new geochronological findings enable it to be established that Permo-Carboniferous magmatism lasted at least 13Ma, in this region of the Appalachian-Variscan belt. Furthermore, a comparison with available data from Paleozoic tectonic units of the Appalachian-Variscan belt located both in the Iberian Massif and outside it enables the suggestion to be made that the Lusitanian Basin (Peniche) most probably rests on the South Portuguese Zone, which may also be correlated with the Rhenohercynian Zone present in southwest England, and the Meguma terrane of Nova Scotia.

Date of Publication
2020-10-20

Where published
Geologica Acta

Publication Identifiers
ISSN - 1696-5728

Publisher
Edicions de la Universitat de Barcelona

Volume
18
Number
16

Number of pages
13
Starting page
1
Last page
14

Document Identifiers
DOI - https://doi.org/10.1344/geologicaacta2020.18.16
URL - http://dx.doi.org/10.1344/geologicaacta2020.18.16

Rankings
SCIMAGO Q2 (2019) - 0.526 - Geology (Q2)
SCOPUS Q2 (2019) - 2.7 - Geology
Web Of Science Q2 (2019) - 1.370 - Geology
CITESCORE (until 2019) Q2 (2019) - 2.7 - Geology
CITESCORE (2020 onward) Q2 (2021) - 2.6 - Geology

Keywords
Pyroclastic breccia Xenoliths Granitic rocks U-Pb zircon dating

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APA
M.F. Pereira, C. Gama, J.B. Silva, Í. Dias da Silva, (2020). Age of the basement beneath the Mesozoic Lusitanian Basin revealed by granitic xenoliths from the Papôa volcanic breccia (West Iberia). Geologica Acta, 18, 1-14. ISSN 1696-5728. eISSN . http://dx.doi.org/10.1344/geologicaacta2020.18.16

IEEE
M.F. Pereira, C. Gama, J.B. Silva, Í. Dias da Silva, "Age of the basement beneath the Mesozoic Lusitanian Basin revealed by granitic xenoliths from the Papôa volcanic breccia (West Iberia)" in Geologica Acta, vol. 18, pp. 1-14, 2020. 10.1344/geologicaacta2020.18.16

BIBTEX
@article{47143, author = {M.F. Pereira and C. Gama and J.B. Silva and Í. Dias da Silva}, title = {Age of the basement beneath the Mesozoic Lusitanian Basin revealed by granitic xenoliths from the Papôa volcanic breccia (West Iberia)}, journal = {Geologica Acta}, year = 2020, pages = {1-14}, volume = 18 }