Connecting onshore structures in the Algarve with the southern Portuguese continental margin: The Carcavai fault zone

Carvalho, João P. G.; Matías, Hugo; Rabeh, Taha; Menezes, Paulo T. L.; Barbosa, Valéria C. F.; Dias, Ruben P.; Carrilho, Fernando

doi:10.1016/j.tecto.2012.08.011

Cited by 17 publications

(11 citation statements)

References 58 publications

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“…The study area is close to the Nubian-Eurasia plate tectonic boundary, where activity is responsible for the vertical movements, subsidence and tectonic inversion affecting the Algarve since the Triassic, up until the Quaternary (Carvalho et al, 2012;Terrinha et al, 2013). The formations outcropping in the area are deformed by these movements, illustrated by the E-W folding, the frequent faulting and the irregular distribution of different lithologies, leading to diverse hydrogeological conditions in the neighboring terrains and a complex karst system (Figure 1).…”

Section: Geology and Geology Of The Central Algarvementioning

confidence: 99%

“…The intermediate surface is divided to two major tectonic steps, represented at São Brás de Alportel ranging between 240 and 260 m of altitude, and at Loulé and Peral between 200 and 220 m. This surface is affected by the Carcavai and Machados faults, the former with recognized neotectonic activity (Carvalho et al, 2012;Dias, 2001;Ressurreição, 2009;Ressurreição, Cabral, Dias, Carvalho, & Pinto, 2011) Some planar levels can be found along the main streams of the area. However their relationship with the levels described above is not clear.…”

Section: Geology and Geology Of The Central Algarvementioning

confidence: 99%

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Central Algarve karst system tufa-related dynamics, Portugal

2016

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Geomorphological mapping is a powerful instrument improving the geomorphological interpretation and understanding of the processes and forms used in landscape studies, with the ability of organizing different thematic layers in the same map. The presented map provide relevant information about the different geomorphological units of the central Algarve (i.e. the Carboniferous flysch mountains; the Barrocal, with marly and karstified subunits), where a karst system is prominent. Solution karst morphologies and large dry areas are common in the elevated areas of the Barrocal, suggesting deep circulation of groundwater. These recharge areas feed the perched aquifers of the area, where discharge is controlled by the impervious lithologies (clay-rich strata of the turbidites, marls and argilites) in the valley bottoms or other leaks in dammed aquifers. In springs related to the main aquifers tufa are actively being formed and, close coupled to spring location, different tufa depositional systems develop. ARTICLE HISTORY

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Section: Geology and Geology Of The Central Algarvementioning

confidence: 99%

Section: Geology and Geology Of The Central Algarvementioning

confidence: 99%

Central Algarve karst system tufa-related dynamics, Portugal

2016

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“…In 1991, Geoterrex conducted a magnetic survey over the Portuguese sector of the Iberian Pyrite Belt for the Rio Tinto mining company using a caesium vapour magnetometer at a constant flight altitude of 90 m (Carvalho 1995;Carvalho et al 2012). The flight lines had a SW-NE orientation and were generally spaced at 500 m, sometimes 250 m, with perpendicular tie lines.…”

Section: Potential-field Datamentioning

confidence: 99%

Subsurface mapping in the Iberian Pyrite Belt using seismic reflection profiling and potential-field data

Carvalho

Inverno

Matos

et al. 2016

Int J Earth Sci (Geol Rundsch)

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locations, were integrated in a 3D software environment along with potential-field, geological and drill-hole data to form a 3D structural framework model. Seismic data show strong reflections that represent several long Variscan thrust planes that smoothly dip to the NNE. Outcropping and previously unknown Late Variscan near-vertical faults were also mapped. Our data strongly suggest that the structural framework of Neves-Corvo extends south-eastwards to Alcoutim. Furthermore, the VSC top is located at depths that show the existence within the IPB of new areas with good potential to develop exploration projects envisaging the discovery of massive sulphide deposits of the NevesCorvo type.Abstract The Iberian Pyrite Belt (IPB) hosts world-class massive sulphide deposits, such as Neves-Corvo in Portugal and Rio Tinto in Spain. In Portugal, the Palaeozoic Volcanic-Sedimentary Complex (VSC) hosts these ore deposits, extending from the Grândola-Alcácer region to the Spanish border with a NW-SE to WNW-ESE trend. In the study area, between the Neves-Corvo mine region and Alcoutim (close to the Spanish border), the VSC outcrops only in a small horst near Alcoutim. Sparse exploration drill-hole data indicate that the depth to the top of the VSC varies from several 100 m to about 1 km beneath the Mértola Formation Flysch cover. Mapping of the VSC to the SE of Neves-Corvo mine is an important exploration goal and motivated the acquisition of six 2D seismic reflection profiles with a total length of approximately 82 km in order to map the hidden extension of the VSC. The data, providing information deeper than 10 km at some

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“…10). The Carcavai Fault is considered as an active fault zone and the probable source of the 1856 Loulé earthquake (Carvalho et al, 2012).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Paleomagnetism of the Central Atlantic Magmatic Province in the Algarve basin, Portugal: First insights

et al. 2015

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Connecting onshore structures in the Algarve with the southern Portuguese continental margin: The Carcavai fault zone

Cited by 17 publications

References 58 publications

Central Algarve karst system tufa-related dynamics, Portugal

Central Algarve karst system tufa-related dynamics, Portugal

Subsurface mapping in the Iberian Pyrite Belt using seismic reflection profiling and potential-field data

Paleomagnetism of the Central Atlantic Magmatic Province in the Algarve basin, Portugal: First insights

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