Volcano-stratigraphic and structural evolution of Brava Island (Cape Verde) based on 40Ar/39Ar, U–Th and field constraints

Madeira, José; Mata, João; Mourão, Cyntia; Silveira, António Brum da; Martins, Sofia; Ramalho, Ricardo S.; Hoffmann, Dirk L.

doi:10.1016/j.jvolgeores.2010.07.010

Cited by 69 publications

(86 citation statements)

References 57 publications

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“…The role of flexural rebound associated with mass wasting and erosional unloading may also add a modest contribution to uplift, as has been suggested to some of the Hawaiian and the Canary Islands (Smith and Wessel, 2000;Menendez et al, 2008). A detailed appraisal of oceanic island uplift mechanisms, magnitudes and rates is outside the scope of this paper; for that we recommend the reader to works such as Smith and Wessel (2000); Zhong and Watts (2002); Ali et al (2003); Klügel et al (2005a); Ramalho et al (2010a,b); Madeira et al (2010);McMurtry et al (2010);Ramalho (2011).…”

Section: Uplift Vs Subsidencementioning

confidence: 86%

“…The evolution of oceanic island systems is, thus, somewhat different according to the different geodynamic/geographic settings where the hotspots are located (Menard and Ladd, 1963;Menard, 1986;Schmincke, 2004;Ramalho, 2011). On fast-moving plates, the evolution of oceanic island systems is generally characterized by short edifice magmatic lifetimes and a long-term subsidence trend -creating linear age-progressive chains (Morgan et al, 1995;Lipman and Calvert, 2013); conversely, on stationary or slow-moving plates, oceanic islands tend to occur in a cluster, typically have longer magmatic lives, and barely subside or experience uplift (Carracedo, 1999;Schmincke, 2004;Menendez et al, 2008;Ramalho et al, 2010a,b,c;Madeira et al, 2010;Ramalho, 2011). Nevertheless, despite the many differences found across hotspot systems, most oceanic island volcanoes can be described through a set of main evolutionary stages.…”

Section: Oceanic Hotspot Island Evolution and Development Of Coastlinesmentioning

confidence: 99%

See 1 more Smart Citation

Coastal evolution on volcanic oceanic islands: A complex interplay between volcanism, erosion, sedimentation, sea-level change and biogenic production

Ramalho¹,

Quartau

Trenhaile

et al. 2013

Earth-Science Reviews

153

147

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The growth and decay of oceanic hotspot volcanoes are intrinsically related to a competition between volcanic construction and erosive destruction, and coastlines are at the forefront of such confrontation. In this paper, we review the several mechanisms that interact and contribute to the development of coastlines on oceanic island volcanoes, and how these processes evolve throughout the islands' lifetime. Volcanic constructional processes dominate during the emergent island and subaerial shield-building stages. During the emergent island stage, surtseyan activity prevails and hydroclastic and pyroclastic structures form; these structures are generally ephemeral because they can be rapidly obliterated by marine erosion. With the onset of the subaerial shield-building stage, coastal evolution is essentially characterized by rapid but intermittent lateral growth through the formation of lava deltas, largely expanding the coastlines until they, typically, reach their maximum extension. With the post-shield quiescence in volcanic activity, destructive processes gradually take over and coastlines retreat, adopting a more prominent profile; mass wasting and marine and fluvial erosion reshape the landscape and, if conditions are favorable, biogenic processes assume a prominent role. Posterosional volcanic activity may temporarily reverse the balance by renewing coastline expansion, but islands inexorably enter in a long battle for survival above sea level. Reef growth and/or uplift may also prolong the island's lifetime above the waves. The ultimate fate of most islands, however, is to be drowned through subsidence and/or truncation by marine erosion.Keywords complex, interplay, between, volcanism, erosion, sedimentation, sea, level, islands, change, coastal, biogenic, production, oceanic, evolution, volcanic, GeoQuest Disciplines Medicine and Health Sciences | Social and Behavioral Sciences Publication DetailsRamalho, R. S., Quartau, R., Trenhaile, A. S., Mitchell, N. C., Woodroffe, C. D. & Avila, S. P. (2013). Coastal evolution on volcanic oceanic islands: a complex interplay between volcanism, erosion, sedimentation, sealevel change and biogenic production. Earth-Science Reviews, 127 140-170. AbstractThe growth and decay of oceanic hotspot volcanoes are intrinsically related to a competition between volcanic construction and erosive destruction, and coastlines are at the forefront of such confrontation. In this paper, we review the several mechanisms that interact and contribute to the development of coastlines on oceanic island volcanoes, and how these processes evolve throughout the islands' lifetime. Volcanic constructional processes dominate during the emergent island and subaerial shield-building stages. During the emergent island stage, surtseyan activity prevails and hydroclastic and pyroclastic structures form; these structures are generally ephemeral because they can be rapidly obliterated by marine erosion. With the onset of the subaerial shield-building stage, coastal evolution is essentially ch...

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Section: Uplift Vs Subsidencementioning

confidence: 86%

Section: Oceanic Hotspot Island Evolution and Development Of Coastlinesmentioning

confidence: 99%

Coastal evolution on volcanic oceanic islands: A complex interplay between volcanism, erosion, sedimentation, sea-level change and biogenic production

Ramalho¹,

Quartau

Trenhaile

et al. 2013

Earth-Science Reviews

153

147

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“…The Cape Verde volcanic rocks are typically highly alkaline, being basanitic to nephelinitic in nature (Gerlach et al 1988; Davies et al 1989). Volcanic rocks from a wide compositional spectrum, for example MgO from 0 to 20 wt%, have been sampled from Santo Antão and Boa Vista (Holm et al 2006;Dyhr and Holm 2010 Madeira et al 2010). As such, this southwest corner of the Cape Verde archipelago poses questions pertaining to magmatic evolution in general, the relationship between Brava and the Cadamosto Seamount and the reasons for the contrasting composition relative to the rest of the archipelago.…”

Section: Geological Settingmentioning

confidence: 99%

Magmatic evolution of the Cadamosto Seamount, Cape Verde: beyond the spatial extent of EM1

Barker

Troll

Ellam

et al. 2011

Contrib Mineral Petrol

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The Cadamosto Seamount is an unusual volcanic centre from Cape Verde, characterised by dominantly evolved volcanics, in contrast to the typically mafic volcanic centres at Cape Verde that exhibit only minor volumes of evolved volcanics. The magmatic evolution of Cadamosto Seamount is investigated to quantify the role of magma-crust interaction and thus provide a perspective on evolved end-member volcanism of Cape Verde. The preservation of mantle source signatures by Nd-Pb isotopes despite extensive magmatic differentiation provides new insights into the spatial distribution of mantle heterogeneity in the Cape Verde archipelago. Magmatic differentiation from nephelinite to phonolite involves fractional crystallisation of clinopyroxene, titanite, apatite, biotite and feldspathoids, with extensive feldspathoid accumulation being recorded in some evolved samples. Clinopyroxene crystallisation pressures of 0.38-0.17 GPa for the nephelinites constrain this extensive fractional crystallisation to the oceanic lithosphere, where no crustal assimilants or rafts of subcontinental lithospheric mantle are available. In turn, magma-crust interaction has influenced the Sr, O and S isotopes of the groundmass and late crystallising feldspathoids, which formed at shallow crustal depths reflecting the availability of oceanic sediments and anhydrite precipitated in the ocean crust. The Nd-Pb isotopes have not been affected by these processes of magmacrust interaction and hence preserve the mantle source signature. The Cadamosto Seamount samples have high 206 Pb/ 204 Pb ([19.5), high eNd (?6 to ?7) and negative D8/ 4Pb, showing affinity with the northern Cape Verde islands as opposed to the adjacent southern islands. Hence, the Cadamosto Seamount in the west is located spatially beyond the EM1-like component found further east. This heterogeneity is not encountered in the oceanic lithosphere beneath the Cadamosto Seamount despite greater extents of fractional crystallisation at oceanic lithospheric depths than the islands of Fogo and Santiago. Our data provide new evidence for the complex geometry of the chemically zoned Cape Verde mantle source.

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“…In Western Senegal, this event can be correlated to the ages deducted by Sarr et al (2000) [48 -45 MYs]. The second volcanic event occurred between 26 -22 to 3 MYs and gave alkaline basalts, slag, diabase, and syenite (Mitchell et al, [28]; Gerlach et al [29]; Torres [30]; Jorgensen and Holm [31]; Torres et al, [32]; Holm et al, [33]; Duprat et al, [34]; Holm et al, [35]; Dyhr and Holm, [36]; Madeira et al, [37]). In Western Senegal, this volcanic even occurred between 35 ± 1.5 and 5.3 ± 0.3 MYs (Crévola et al, [6]).…”

Section: Discussionmentioning

confidence: 99%

Comparative Geochemical Study of the Tertiary and Quaternary Lavas of Western Senegal and the Cape Verde Islands: Geodynamic Implications

Yatte¹,

Diallo²,

Sagna³

2015

IJG

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The western area of Senegal was the site of a basic volcanism in the Tertiary and Quaternary. That volcanism had caused the formation of alkaline olivine basalts, basanites and nephelinites from microlitic and porphyritic texture to dolerite texture. The geochemistry of major elements shows that the Quaternary basalts are more aluminous and more siliceous, but they contain less magnesium, less iron and less calcium than the Tertiary basalts. Two types of basalt occur here, based on the characteristics of the major elements in the Tertiary lavas: the highly undersaturated basalts of the Cape Verde Peninsula and the slightly undersaturated basalts of the Thiès Plateau. The characteristics of the trace elements reveal shallow interactions due to the contamination and/or assimilation, and to the fractional crystallization, but not due to the heterogeneity of the source. The strong enrichment in light rare earth elements (LREE) and the slight enrichment in heavy rare earth elements (HREE), the anomalies which are negative in K and Pb and positive in Nb, Ta and Eu of the Tertiary and Quaternary basalts of Western Senegal and similar anomalies of the same elements (Pb not analyzed) described in the Cape Verde islands, allow us to establish links between the petrogenetic mechanisms that had caused the formation of the basalts of this Islands and Western Senegal. Moreover, the volcanic activity in Western Senegal (of continental lntraplate type) and that of the Cape Verde Islands (oceanic intraplate type) are probably related to the hot spot located on the vertical of the Cape Verde.

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Volcano-stratigraphic and structural evolution of Brava Island (Cape Verde) based on 40Ar/39Ar, U–Th and field constraints

Cited by 69 publications

References 57 publications

Coastal evolution on volcanic oceanic islands: A complex interplay between volcanism, erosion, sedimentation, sea-level change and biogenic production

Coastal evolution on volcanic oceanic islands: A complex interplay between volcanism, erosion, sedimentation, sea-level change and biogenic production

Magmatic evolution of the Cadamosto Seamount, Cape Verde: beyond the spatial extent of EM1

Comparative Geochemical Study of the Tertiary and Quaternary Lavas of Western Senegal and the Cape Verde Islands: Geodynamic Implications

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