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| Manadas Volcanic Complex | |
|---|---|
| Name | Manadas Volcanic Complex |
| Location | Azores, Portugal |
| Elevation m | 666 |
| Coordinates | 37°46′N 25°18′W |
| Type | Stratovolcanic complex |
| Last eruption | 1761 CE (historical) |
Manadas Volcanic Complex is a volcanic complex on the island of Pico in the Azores archipelago of Portugal. The complex forms a distinctive portion of Pico Island's western flank and interacts with nearby features such as Mount Pico, Lajes do Pico, and the Faial-Pico Channel. Its geology and landforms have been studied in the context of North Atlantic volcanism, Azorean rift systems, and Portuguese geological surveys.
The complex lies on the western side of Pico Island near the civil parishes of São Roque do Pico, Lajes do Pico, and Santa Luzia and is visible from maritime routes between Horta on Faial Island and Madalena. Regional geography places the complex within the North Atlantic plate boundary environment involving the Eurasian Plate, African Plate, and the North American Plate triple junction region near the Mid-Atlantic Ridge. Local access routes include the regional roads linking to Aeroporto das Lajes and the port infrastructure at Madalena, which support geological fieldwork by institutions such as the University of the Azores and the Portuguese Institute for Sea and Atmosphere.
Tectonically the complex occupies a segment of the Azores Plateau influenced by the Mid-Atlantic Ridge spreading center and the Azores triple junction; it is genetically tied to magma sources comparable to those beneath Mount Pico and volcanic centers on Faial Island and São Jorge Island. Stratigraphic relations demonstrate interactions with regional fissure systems analogous to those at Capelinhos and along the Vulcão dos Capelinhos eruptive alignments, and studies reference mapping efforts by the Serviço Regional de Proteção Civil dos Açores. Petrologic links are drawn to mantle processes discussed in publications from the Geological Survey of Portugal and comparative studies with Iceland and the Canary Islands.
The complex comprises overlapping volcanic edifices including scoria cones, basaltic lava flows, trachytic domes, and pyroclastic deposits, with landforms comparable to features on São Jorge Island ridges and Graciosa Island monogenetic fields. Distinct morphological elements include radial lava fields, a sequence of eruptive fissures trending similarly to the Pico ridge, and a shallow intrusive complex that has been compared with intrusive bodies studied at Mount Teide and Stromboli. Field campaigns by researchers affiliated with University of Lisbon and University of Coimbra have mapped pahoehoe and a'a flow textures, pyroclast stratification, and fault-controlled vents.
Historical records attribute eruptive activity in the 18th century, notably the 1761 event documented in contemporary archives from Lisbon and maritime logs from Horta and Madalena. Radiometric dating, including K–Ar and 14C constraints used in studies at Instituto Superior Técnico and the University of the Azores, indicate sequences of Holocene activity interspersed with late Pleistocene foundations comparable to eruptive chronologies on São Miguel Island. Tephrostratigraphic correlations have been pursued with wider Azorean layers preserved in lacustrine records and peat deposits sampled by teams from the Natural History Museum, London and the University of Coimbra.
Mineralogy and geochemical analyses reveal basaltic to trachybasaltic compositions with subordinate trachytic differentiation, echoing magmatic trends observed at Mount Pico and Capelinhos. Studies using XRF and ICP-MS at laboratories in Porto and Lisbon show enrichment in incompatible elements and isotopic signatures consistent with heterogeneous mantle sources influenced by the Azores plume hypothesis analogous to research on the Iceland plume and Canary hotspot. Xenolith occurrences and phenocryst assemblages provide constraints used in models developed by the University of Cambridge and the Vrije Universiteit Amsterdam for crustal assimilation and fractional crystallization processes.
Potential hazards include effusive lava flows, scoria cone eruptions, tephra fallout affecting settlements such as São Roque do Pico and Madalena, and volcanic gas emissions that may impact maritime traffic near Faial-Pico Channel and aviation routes linked to Aeroporto da Horta. Monitoring is coordinated by organizations including the Serviço Regional de Proteção Civil dos Açores, the Instituto Português do Mar e da Atmosfera, and research groups at the University of the Azores, employing seismic networks, ground deformation surveys, and gas geochemistry protocols similar to those used at Stromboli and Mount Etna.
Human settlement and land use around the complex have been shaped by agriculture, vineyards inscribed in cultural landscapes recognized by UNESCO in the Landscape of the Pico Island Vineyard Culture nomination, traditional whaling heritage linked to communities in Madalena and Lajes do Pico, and tourism drawing visitors from Lisbon, Porto, and international ports such as Ponta Delgada. Cultural ties involve parish churches and municipal archives in São Roque do Pico and infrastructure managed by the Regional Government of the Azores, while conservation and geotourism initiatives involve collaborations with the Azores Geopark and museums such as the Museu dos Baleeiros.