Morpho-structural evolution of a volcanic island developed inside an active oceanic rift: S. Miguel Island (Terceira Rift, Azores)

Catastrophic flank collapses and slumping in Pico Island during the last 130 kyr (Pico-Faial ridge, Azores Triple Junction)

“…(2) The WNW-ESE to E-W trend, which locally corresponds to the alignment of the headwall of the slump with the axis of the Fissural System, and regionally corresponds to the orientation of the main normal faults making up the diffuse Nu/Eu plate boundary.We note that earlier flank collapses recently recognized in Graciosa (Central Azores) and in S. Miguel Island have also occurred along such directions (e.g., Sibrant et al, 2014Sibrant et al, , 2015b, reinforcing the role of regional tectonics as a major factor influencing/controlling flank movements in the Azores. Our study on Pico extends the record of past flank collapses in the Azores up to very recent times.…”

“…Despite the relatively small volume of the Azorean islands, increasing evidence for large-scale catastrophic destruction in the form of lateral flank collapses has been accumulated (Marques et al, 2013b;Costa et al, 2014;Sibrant et al, 2014Sibrant et al, , 2015aSibrant et al, , 2015b. Large-scale mass-wasting on Pico's N flank was interpreted by Costa et al (2014) as resulting from catastrophic collapse(s) towards the N. Pico's S flank is currently affected by an active large-scale slump with subsidence up to 1 cm/yr (Hildenbrand et al, 2012b), which comprises the western remnants of an earlier catastrophic collapse to the S. Though the current topography shows a well-defined scar extending much further to the E of the slump, which is suggestive of a flank collapse, there was until now no evidence of the catastrophic collapse, e.g.…”

Geographical distance and barriers explain population genetic patterns in an endangered island perennial

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Figure 1A map showing the Azores archipelago within Macaronesia. Within the rectangle on the right details of the Azores islands are shown, with updated islands ages (Sibrant et al 2015; Ávila et al 2016). At the bottom, studied populations of Lactuca watsoniana are shown.

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The Complex Vertical Motion of Intraplate Oceanic Islands Assessed in Santiago Island, Cape Verde

“…The samples were dated in Laboratory GEOPS (Univ. Paris-Sud, Orsay, France) with the unspiked K-Ar Cassignol-Gillot technique Gillot & Cornette, 1986), which allows the precise determination of small amounts of radiogenic argon ( 40 Ar*) and is particularly appropriate to date young volcanic rocks, including late quaternary low-K basalts and andesites (e.g., Bablon et al, 2018Bablon et al, , 2019Boulesteix et al, 2012Boulesteix et al, , 2013Costa et al, 2014Costa et al, , 2015Germa et al, 2010Germa et al, , 2011Hildenbrand et al, 2003Hildenbrand et al, , 2004Hildenbrand et al, , 2008Hildenbrand et al, , 2012Hildenbrand et al, , 2014Hildenbrand et al, , 2018Marques et al, 2015Marques et al, , 2018Quidelleur et al, 2008;Ricci et al, 2015Ricci et al, , 2017Ricci et al, , 2018Salvany et al, 2012;Sibrant et al, 2014;Sibrant, Hildenbrand, Marques, Weiss, et al, 2015;Silva et al, 2012Silva et al, , 2018. The technique has even been extended to the last millennium with an uncertainty of only a few centuries in the case of high-K lavas (Quidelleur et al, 2001).…”