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Granite Plateau of Chãs de Sta Luzia

Granitic rocks and granitic landforms.

Accordingly to Carvalhido (2012, 2014) this Local Natural Monument geosite corresponds to an area of ​​about 908 ha, constituted to the north by the Chã de Afife, to the east by the Chã da Gurita de Couço and to the south, by the Chãs de Carreço and Areosa. The western limit of the geosite coincides, roughly, with the Atlantic slope of the Serra de Santa Luzia. From the geocultural interest point of view, they refer to the conservation of inscultures, namely fossets and quadriláteros, which are manifestations of litholatry (Bronze age?) Or will be much later, consisting of parish limits or support for games practiced by pastors. There is still no consensus on the age and significance of these engravings (Almeida, 1981; Abreu, 2009). From a geomorphological point of view, the geosite constitutes the flattening surface at the top of the Santa Luzia mountain range, which develops essentially at 460 meters (eg Santa Luzia, 550 m). This surface constitutes the culminating surface of the Caminha-Viana do Castelo antiform. Residual geoforms such as the inselberg (eg. bornhardt dorso-de-baleia, in Chã de Afife) and the largest scale, the pothole, are relics of the subaerial evolution stage of granite terrain, prior to the erosion of the regolith. The exutories that were identified associated with the potholes, prove that these structures were probably recovered during the post-exhumation stages of the terrain, in the domain of the processes of slope dynamics. There are several outcrops with swarms of surmicaceous and biotitic enclaves with tourmaline, relic testimonies of the dome position of the Bouça de Frade pluton in relation to the metasedimentary embedding.

In the area of ​​Covões and according to Lima (2006) the gradual contact of the plutons of Bouça de Frade and Afife occurs, with some pegmatitic differences due to their structure and mineralogy. These bodies are philonian and assume variable outcropping (up to ~ 1 m) and north-south subvertical altitudes. Presenting as interesting mineral accessories are automorphic garnet, tourmaline and beryl. This geosite is part of the Lavarias Romeiras de Santa Luzia geosite, which is an area where hydrogravitic separation of Sn (cassiterite), rutile, ilmenite-rutile and ilmenite was carried out in basins and gutters. This activity was generally carried out by women and children, on a seasonal basis, namely in the rainy seasons and periods.

The geosite is an area of ​​great landscape and ecological value, the latter patent, for example, in the biological communities installed in the lagoons and streams formed as a result of local emergencies (Chã de Carreço).


References:

Carvalhido, R.; Brilha, J. & Pereira, D. (2014). Monumentos Naturais Locais de Viana do Castelo: processo de classificação e estratégias de valorização. Comunicações Geológicas (2014) 101, Especial III, 1219–1223.

Carvalhido, Ricardo (2012).O Litoral Norte de Portugal (Minho-Neiva) : evolução paleoambiental quaternária e proposta de conservação do património geomorfológico. Tese de Doutoramento. Universidade do Minho. 564 p.

Lima, M. F. (2006). Caracterização e estratégias de valorização sustentável de ocorrências geológicas com importância patrimonial. Tese de Doutoramento, Universidade do Minho.

Almeida, C. F. (1981). Território paroquial no Entre-Douro-e-Minho: sua sacralização. Nova Renascença, Porto, 1 (2), p.202-212.

Abreu, A. (2009). História de Viana do castelo, Câmara Municipal, 1, 61-65.

Accordingly to Carvalhido (2012, 2014) this Local Natural Monument geosite corresponds to an area of ​​about 908 ha, constituted to the north by the Chã de Afife, to the east by the Chã da Gurita de Couço and to the south, by the Chãs de Carreço and Areosa. The western limit of the geosite coincides, roughly, with the Atlantic slope of the Serra de Santa Luzia. From the geocultural interest point of view, they refer to the conservation of inscultures, namely fossets and quadriláteros, which are manifestations of litholatry (Bronze age?) Or will be much later, consisting of parish limits or support for games practiced by pastors. There is still no consensus on the age and significance of these engravings (Almeida, 1981; Abreu, 2009). From a geomorphological point of view, the geosite constitutes the flattening surface at the top of the Santa Luzia mountain range, which develops essentially at 460 meters (eg Santa Luzia, 550 m). This surface constitutes the culminating surface of the Caminha-Viana do Castelo antiform. Residual geoforms such as the inselberg (eg. bornhardt dorso-de-baleia, in Chã de Afife) and the largest scale, the pothole, are relics of the subaerial evolution stage of granite terrain, prior to the erosion of the regolith. The exutories that were identified associated with the potholes, prove that these structures were probably recovered during the post-exhumation stages of the terrain, in the domain of the processes of slope dynamics. There are several outcrops with swarms of surmicaceous and biotitic enclaves with tourmaline, relic testimonies of the dome position of the Bouça de Frade pluton in relation to the metasedimentary embedding.

In the area of ​​Covões and according to Lima (2006) the gradual contact of the plutons of Bouça de Frade and Afife occurs, with some pegmatitic differences due to their structure and mineralogy. These bodies are philonian and assume variable outcropping (up to ~ 1 m) and north-south subvertical altitudes. Presenting as interesting mineral accessories are automorphic garnet, tourmaline and beryl. This geosite is part of the Lavarias Romeiras de Santa Luzia geosite, which is an area where hydrogravitic separation of Sn (cassiterite), rutile, ilmenite-rutile and ilmenite was carried out in basins and gutters. This activity was generally carried out by women and children, on a seasonal basis, namely in the rainy seasons and periods.

The geosite is an area of ​​great landscape and ecological value, the latter patent, for example, in the biological communities installed in the lagoons and streams formed as a result of local emergencies (Chã de Carreço).


References:

Carvalhido, R.; Brilha, J. & Pereira, D. (2014). Monumentos Naturais Locais de Viana do Castelo: processo de classificação e estratégias de valorização. Comunicações Geológicas (2014) 101, Especial III, 1219–1223.

Carvalhido, Ricardo (2012).O Litoral Norte de Portugal (Minho-Neiva) : evolução paleoambiental quaternária e proposta de conservação do património geomorfológico. Tese de Doutoramento. Universidade do Minho. 564 p.

Lima, M. F. (2006). Caracterização e estratégias de valorização sustentável de ocorrências geológicas com importância patrimonial. Tese de Doutoramento, Universidade do Minho.

Almeida, C. F. (1981). Território paroquial no Entre-Douro-e-Minho: sua sacralização. Nova Renascença, Porto, 1 (2), p.202-212.

Abreu, A. (2009). História de Viana do castelo, Câmara Municipal, 1, 61-65.

Location

Serra de Sta. Luzia

Coordinates

Lat: 41.784102

Long: -8.8268393

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