Tectónica da Ponta de São Lourenço, Ilha da Madeira

PRADA, SUSANA; Madeira, J.; Fonseca, P. E.; Silveira, A.; Prada, S.; Rodrigues, C. F.

Publication

Tectónica da Ponta de São Lourenço, Ilha da Madeira

2005Journal article

datacite.subject.fos	Ciências Naturais::Ciências da Terra e do Ambiente
dc.contributor.author	PRADA, SUSANA
dc.contributor.author	Madeira, J.
dc.contributor.author	Fonseca, P. E.
dc.contributor.author	Silveira, A.
dc.contributor.author	Prada, S.
dc.contributor.author	Rodrigues, C. F.
dc.date.accessioned	2025-11-20T12:10:36Z
dc.date.available	2025-11-20T12:10:36Z
dc.date.issued	2005
dc.description.abstract	The tectonics of Madeira Island is, in its generality, still quite unknown. A structural characterization togeth er with the formulation of hypothesis contributing to this problematic is, in our opinion, of extreme impor tance to relate this context with the regional and global tectonic models. The Ponta de São Lourenço, in Madeira Island, exhibited an unusual situation for studies of this nature, due to the diversity of lithologies found there, as well as the presence of excellent natural cross-sections originated by marine erosion. In terms of tectonics, the studied area is dominated by accidents of distensive nature, organized in two out standing families: E-W and NW-SE. From these structures the most important are: a dyke swarm, very dense and with an approximate WNW-ESE direction; and a fracture pattern where we highlight the Seixal Machico (N50ºW, subvertical), Pedra Furada (E-W, 70ºN) and Estreito (N50ºW, 70ºN) faults. The analysis of those structures suggests a distensive tension field with minimum compression axis (s3) oriented with NNE-SSW direction, and maximum compression axis (s1) subvertical, related to the weight of the lytho static column (gravitical origin). This tension field suggests a hotspot rift model, similar to the one proposed by WALKER (1987), for shield volcanoes of the Hawaiian kind. This tension field seems to have a constant space-temporal orientation, with probable neotectonic activity. It is also proposed a tectonic control of vol canism, confirmed by the presence of aligned volcanic structures with the same directions previously described. It is equally proposed the existence of a structural control of the coast line and the landforms in the area.	eng
dc.identifier.issn	0213-4497
dc.identifier.uri	http://hdl.handle.net/10400.13/7474
dc.language.iso	por
dc.peerreviewed	n/a
dc.publisher	Instituto Universitario de Xeoloxía Isidro Parga Pondal of the University of A Coruna
dc.rights.uri	http://creativecommons.org/licenses/by-nc/4.0/
dc.subject	Structure
dc.subject	Tectonics
dc.subject	Orientation of tension field
dc.subject	Madeira Island
dc.subject	Geologia
dc.subject	Estrutura
dc.subject	Madeira (Portugal)
dc.subject	.
dc.subject	Faculdade de Ciências Exatas e da Engenharia
dc.title	Tectónica da Ponta de São Lourenço, Ilha da Madeira	por
dc.title.alternative	Tectonics of Ponta de São Lourenço, Madeira Island	eng
dc.type	journal article
dspace.entity.type	Publication
oaire.citation.endPage	234
oaire.citation.startPage	223
oaire.citation.title	Cadernos do Laboratorio Xeolóxico de Laxe
oaire.citation.volume	30
oaire.version	http://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyName	PRADA
person.givenName	SUSANA
person.identifier.orcid	0000-0003-4050-8186
relation.isAuthorOfPublication	56cda262-2033-4f1e-95a3-7aeefd019f39
relation.isAuthorOfPublication.latestForDiscovery	56cda262-2033-4f1e-95a3-7aeefd019f39