New insights on the middle Givetian/middle Frasnian palynofloras from the Phyllite-Quartzite Formation in the Neves-Corvo mine region (Iberian Pyrite Belt, Portugal)

Mendes, Márcia; Pereira, Zélia; Matos, João Xavier; Albardeiro, Luís; Morais, Igor; Solá, Ana Rita; Salgueiro, Rute; Pacheco, Nelson; Araújo, Vítor; Inverno, Carlos; Oliveira, José Tomás

doi:10.1016/j.revmic.2020.100447

Cited by 12 publications

(3 citation statements)

References 17 publications

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“…In the internal domain of SPZ, IPB (Fig. 2), the lowermost known stratigraphic unit comprises the Phyllite-Quartzite Group (lattermost Famennian in the uppermost section; bottom is currently unknown but at least early Givetian; Mendes et al, 2020), that corresponds to a typical siliciclastic shallow marine environment. The Phyllite-Quartzite Group is divided into the Phyllite-Quartzite Formation and the Barranco do Homem-Represa Formation (Mendes et al, 2018).…”

Section: Geological Contextmentioning

confidence: 99%

Detrital zircon similarities and dissimilarities between the Iberian Pyrite Belt, Ossa-Morena Zone and Meguma

Amaral

Solá²,

Santos³

et al. 2022

GeA

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Despite the so-called exotic nature of the South Portuguese Zone relatively to the other major domains of the Iberian Massif of peri-Gondwanan affinity, Devonian detrital rocks of the oldest strata in the Iberian Pyrite Belt have a remarkable resemblance with the Ossa-Morena Zone’s Neoproterozoic-Cambrian rocks and the West Meguma’s Cambrian-Ordovician rocks, presenting the so-called “West African signature”.

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Section: Geological Contextmentioning

confidence: 99%

Detrital zircon similarities and dissimilarities between the Iberian Pyrite Belt, Ossa-Morena Zone and Meguma

Amaral

Solá²,

Santos³

et al. 2022

GeA

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“…The lithostratigraphic sequence of the Neves‐Corvo mine area is comprised of three main regional units (Figure 2), which are, from the bottom up: Phyllite–Quartzite Group, the Volcano‐Sedimentary Complex (VSC), and the Mértola Formation (the lower unit of the Baixo Alentejo Flysch Group) (Mendes et al., 2018; Oliveira et al., 2013; Pereira et al., 2008). The VSC is divided into a Lower VSC and an Upper VSC sequence; the top of Lower VSC is of particular interest since it is where massive sulphide mineralization is found.…”

Section: Geological Settingmentioning

confidence: 99%

3D reflection seismic imaging of volcanogenic massive sulphides at Neves‐Corvo, Portugal

Donoso

Malehmir

Carvalho

et al. 2022

Geophysical Prospecting

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Three-dimensional reflection seismic data from the Neves-Corvo area, southern Portugal, were reprocessed with the main objective of improving the seismic signature of the Lombador and Semblana volcanogenic massive sulphide deposits. The sensitivity for choosing adequate parameters for targeted imaging, even during the pre-processing stage, such as common-depth point binning size, was studied in detail before the main processing work began helping to optimize bin size parameters; preliminary stacking results from this analysis presented severe acquisition footprint, and seismic targets were not clearly identifiable. Processing results using pre-stack dip move-out and poststack migration methods show strong moderate to steeply dipping reflections. Several of the observed reflections can be correlated with known lithological contacts, some of which are interpreted to originate from the Semblana and Lombador deposits. Despite the mixed signal-to-noise ratio, the seismic cube reveals both shallow and deep threedimensional structures, allowing to account for the deposits' lateral extension beyond the capabilities of two-dimensional seismic imaging alone. Given the data processing approach taken it was possible to distinguish strong diffraction patterns, interpreted as originating from faults and edges of the Lombador deposit, illustrating the usefulness of diffraction patterns for better interpretation of geological features in hard-rock environments.

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“…The lowermost group of the IPB, the Phyllite-Quartzite Group (PQG), of at least Givetian (basement is unknown) to Famennian in its uppermost section, has been interpreted to represent a passive margin setting (e.g. Braid et al, 2011;Mendes et al, 2020). This sequence is overlain by the Volcanic-Sedimentary Complex (VSC) of late Famennian to middle Visean age.…”

Section: Geological Settingmentioning

confidence: 99%

U-Pb zircon SHRIMP dating of a protracted magmatic setting and its volcanic emplacement: Insights from the felsic volcanic rocks hosting the sulphide ore of the giant Aljustrel deposit, Iberian Pyrite Belt

Amaral

Solá

Santos

et al. 2021

Ore Geology Reviews

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A geochronological study using SHRIMP U-Pb analysis of zircon grains has been conducted to date felsic volcanic rocks hosting the six massive sulphide deposits of the giant Aljustrel mining district in the Iberian Pyrite Belt. A multiple method age calculation approach was used to validate and ponder calculated Concordia ages (emplacement and inherited), which included weighted average, probability density peak(s), Tuff Zirc and Unmix functions. This approach was particularly useful to interpret the wide continuous single U-Pb ages (320-405 Ma) recorded in the Aljustrel volcanic rocks.The volcanic pile (>250 m) that hosts the Aljustrel deposits was emplaced between 359 and 353 Ma. Upper Devonian inheritance, representing subvolcanic activity, is well-represented in the volcanic rocks of Aljustrel (373-365 Ma). Older Devonian inherited zircon ages at 405 Ma, 388 Ma and 380 Ma were retrieved, hypothetically representing deep plutonism or other melting episodes, which suggests a long-lasting (~50 Ma) magmatic activity in the Aljustrel district. Older pre-Devonian inherited ages, uppermost Silurian and early to late Cambrian, and post-emplacement ages (~330-345 Ma) were also detected, with the latter reflecting Pb loss most likely driven by the main Variscan orogenic event.Maximum ages obtained for the volcanic rocks in the different deposits open the possibility that the last pulses of volcanic activity and subsequent deposition of the massive sulphides were diachronic in the different Aljustrel sub-basins. Additionally, results imply that, contrary to previously assumed, Gavião and São João-Moinho deposits are probably not the same ore lens disrupted by tardi-Variscan faults. This opens new opportunities for mining exploration and targeting in the Aljustrel district and points out the importance of high-resolution geochronological studies in mining and brownfield areas.

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New insights on the middle Givetian/middle Frasnian palynofloras from the Phyllite-Quartzite Formation in the Neves-Corvo mine region (Iberian Pyrite Belt, Portugal)

Cited by 12 publications

References 17 publications

Detrital zircon similarities and dissimilarities between the Iberian Pyrite Belt, Ossa-Morena Zone and Meguma

Detrital zircon similarities and dissimilarities between the Iberian Pyrite Belt, Ossa-Morena Zone and Meguma

3D reflection seismic imaging of volcanogenic massive sulphides at Neves‐Corvo, Portugal

U-Pb zircon SHRIMP dating of a protracted magmatic setting and its volcanic emplacement: Insights from the felsic volcanic rocks hosting the sulphide ore of the giant Aljustrel deposit, Iberian Pyrite Belt

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