Ignimbrite stratigraphy and chronology on Terceira Island, Azores

Gertisser, Ralf; Self, Stephen; Gaspar, J. L.; Kelley, Simon P.; Pimentel, Adriano; Eikenberg, J.; Barry, T. L.; Pacheco, José; Queiroz, G.; Vespa, M.

doi:10.1130/2010.2464(07)

Cited by 27 publications

(47 citation statements)

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“…For example, very little glass shard data are available from Quaternary eruptions of the volcanoes in the Canaries and Azores archipelagos. Both centres are reported to have had multiple caldera-forming eruptions during the Late Quaternary (Ablay and Martí, 2000;Queiroz et al, 2008;Gertisser et al, 2010) and lie within a few thousand kilometres of Morocco and within a westerly atmospheric circulation pattern that would suggest these as a likely source for tephra in sites across NW Africa. The discovery of four cryptotephra horizons at Taforalt, from likely Atlantic and Mediterranean volcanoes, as well as hints of tephra within the stratigraphy of Dar es-Soltane 1 and Rhafas, indicate future potential for linking MSA and LSA archaeological sites across and beyond the Maghreb.…”

Section: Correlating Between Archivesmentioning

confidence: 97%

“…(a) total-alkali-silica diagram showing compositional classification of all analysed tephra layers from Taforalt. Compositional envelopes for a range of trachytic and rhyolitic tephra layers from North Atlantic and Southern European volcanic centres plotted to show possible correlations (data fromWulf et al, 2004;Beier et al, 2006;Gertisser et al, 2010;Matthews et al, 2011; Lane et al, 2012a,b;Albert et al, 2013; Tomlinson et al, this issue). (b) Bi-plot of Al 2 O 3 vs FeO for rhyolitic tephra layers in Sector 1 R4 and Sector 8, showing discrimination from tephra of the Cape Riva, Askja-S, Vedde Ash and Acigol eruptions.…”

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confidence: 97%

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The role of cryptotephra in refining the chronology of Late Pleistocene human evolution and cultural change in North Africa

Barton

Lane

Albert

et al. 2015

Quaternary Science Reviews

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Section: Correlating Between Archivesmentioning

confidence: 97%

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confidence: 97%

The role of cryptotephra in refining the chronology of Late Pleistocene human evolution and cultural change in North Africa

Barton

Lane

Albert

et al. 2015

Quaternary Science Reviews

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“…1, e.g. Self 1976;Calvert et al 2006;Gertisser et al 2010;Quartau et al 2014;Zanon & Pimentel 2015). The oldest volcano of Terceira is Cinco Picos (>401 ka; Hildenbrand et al 2014) that together with Guilherme 592 L.V.…”

Section: G E O L O G I C a L S E T T I N G A N D S A M P L I N G S T mentioning

confidence: 99%

“…of the dating (A, Calvert et al 2006;B, Pimentel et al 2016;C, Hildenbrand et al 2014 Moniz volcano (>270 ka; Calvert et al 2006) are considered extinct. The two youngest volcanoes, Pico Alto (>141 ka; Gertisser et al 2010) and Santa Barbara (>65 ka; Hildenbrand et al 2014), are active and have erupted contemporaneously with the fissure zone, at least in the last 50 ka. The most recent subaerial volcanic activity was in the fissure zone in the centre of the island, where the last eruption occurred in 1761 AD (Self 1976;Calvert et al 2006;Zanon & Pimentel 2015).…”

Section: G E O L O G I C a L S E T T I N G A N D S A M P L I N G S T mentioning

confidence: 99%

The multimethod palaeointensity approach applied to volcanics from Terceira: full-vector geomagnetic data for the past 50 kyr

Groot¹,

Pimentel

Chiara

2016

Geophys. J. Int.

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S U M M A R YThe island of Terceira (38.5 • N, 27.2 • W) in the Azores Archipelago boasts a wealth of welldated recent volcanic products; it is therefore the ideal location to improve the resolution of the full-vector geomagnetic field record for the Mid-Atlantic Ocean. We investigated 21 (sub-)sites sampled from 10 different cooling units; six of these cooling units are from the Holocene, the other four are approximately coeval with the age of known geomagnetic excursions. After successfully determining the palaeodirections from all but one site, we applied the multimethod palaeointensity approach to all sites. Here, we used three different palaeointensity methods: the IZZI-Thellier protocol, the Multispecimen technique, and the calibrated pseudo-Thellier method. For the Holocene sites four robust palaeointensity estimates were obtained, they mostly agree with data from the nearby island of São Miguel and data from the Iberian Peninsula and West Africa. Two older sites, dated at 25.7 and 46.3 ka, produced low palaeointensities: 24.4 and 24.1 µT, respectively. As both the IZZI-Thellier and pseudo-Thellier methods yielded technically acceptable results for these sites we used them to improve the pseudo-Thellier calibration relation and establish its applicability to lower palaeointensities. Sixty per cent of all sampled cooling units/ages in our study yielded a technically successful palaeointensity estimate; this unusually high success rate is attributed both to our sampling strategy and the implementation of the multimethod approach.

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“…The island is made up of four strato-volcanoes, two of them believed to be extinct and affected by large collapses (Guilherme Moniz and Cinco Picos volcanoes, Figure 1) and two being considered still active (Pico Alto and Santa Bárbara volcanoes, Figure 1; Self, 1974Self, , 1976Calvert, Moore, # 2013 D. Casalbore McGeehin, & Rodriguez da Silva, 2006;Gertisser et al, 2010). A main WNW-ESE-oriented fissural volcanic system, characterized subaerially by the alignment of cinder cones and eruptive fissures, crosses the island and extends into the submarine flanks of the island as the Serreta Ridge ( Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Bathy-morphological setting of Terceira Island (Azores) after the FAIVI cruise

et al. 2013

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High-resolution morpho-bathymetric data at 1:200,000 scale obtained during the FAIVI cruise (2011) and the resulting geomorphologic map of the Terceira island offshore area (central Azores, Portugal) are presented for the first time. The uneven morphology around Terceira is primarily related to volcanic features, such as linear and cone-shaped eruptive centres and lava flows. Such features are mostly concentrated on volcanic ridges and are aligned along preferential axes, suggesting a strong interaction between tectonics and volcanic processes. The occurrence of active tectonics is also demonstrated by systems of faults cutting the seafloor to the north, east and south of the island. Mapped erosive-depositional features include an insular shelf located at , 150 m water depth (wd), small landslide headwalls, erosive scarps, channelized features and crescent-shaped bedforms. The presented map may represent the base for a first-order geo-hazard assessment.

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Ignimbrite stratigraphy and chronology on Terceira Island, Azores

Cited by 27 publications

References 0 publications

The role of cryptotephra in refining the chronology of Late Pleistocene human evolution and cultural change in North Africa

The role of cryptotephra in refining the chronology of Late Pleistocene human evolution and cultural change in North Africa

The multimethod palaeointensity approach applied to volcanics from Terceira: full-vector geomagnetic data for the past 50 kyr

Bathy-morphological setting of Terceira Island (Azores) after the FAIVI cruise

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