Tracers of uplift and subsidence in the Cape Verde archipelago

  title={Tracers of uplift and subsidence in the Cape Verde archipelago},
  author={Ricardo S. Ramalho and George Helffrich and Daniela N. Schmidt and Dylan Vance},
  journal={Journal of the Geological Society},
  pages={519 - 538}
Abstract: Ocean islands are subject to vertical movements through their lifetime and these movements' origins are poorly understood. Tracking island freeboard provides insight into the mechanisms that cause these movements. The Cape Verde archipelago is the result of hotspot volcanism ranging from 26 Ma to the present, and constitutes a structural pile that has preserved a record of the palaeo-positions of mean sea level. These palaeo-markers, both sedimentary and volcanic, are datable and can… 

Figures and Tables from this paper

Emergence and evolution of Santa Maria Island (Azores)—The conundrum of uplifted islands revisited
The growth and decay of ocean-island volcanoes are intrinsically linked to vertical movements. While the causes for subsidence are better understood, uplift mechanisms remain enigmatic. Santa Maria
Biostratigraphic evidence for dramatic Holocene uplift of Robinson Crusoe Island, Juan Fernández Ridge, SE Pacific Ocean
Abstract. Hotspot oceanic islands typically experience subsidence due to several processes related to migration of the oceanic plate away from the mantle plume and surface flexural loading. However,
The Complex Vertical Motion of Intraplate Oceanic Islands Assessed in Santiago Island, Cape Verde
Dated paleosea level markers and eustatic sea level changes are necessary but not sufficient information to calculate vertical motion rates on oceanic islands. Therefore, we use a procedure in which
A geological record of multiple Pleistocene tsunami inundations in an oceanic island: The case of Maio, Cape Verde
In the Central Atlantic archipelagos – the Canaries, Cape Verde, Madeira and the Azores – tsunami hazard is often regarded as low, when compared with other extreme wave events such as hurricanes and
Morphology of the Faial Island shelf (Azores): The interplay between volcanic, erosional, depositional, tectonic and mass‐wasting processes
The extents of volcanic island shelves result from surf erosion, which enlarges them, and volcanic progradation, which reduces them. However, mass‐wasting, tectonics and sediment deposition also
Investigating volcanic hazard in Cape Verde Islands through geophysical monitoring: network description and first results
Abstract. We describe a new geophysical network deployed in the Cape Verde Archipelago for the assessment and monitoring of volcanic hazards as well as the first results from the network. Across the


Depleted swell root beneath the Cape Verde Islands
The hotspot swell—an area of uplifted bathymetry or topography surrounding regional volcanism—is a defining hotspot characteristic, yet its origin is poorly understood. To test current ideas about
Quaternary marine terraces on Sal Island (Cape Verde archipelago)
Volcanism and archipelagic aprons in the Marquesas and Hawaiian Islands
Geophysical observations demonstrate that the archipelagic apron surrounding the Marquesan hot-spot volcanoes is derived almost entirely from mass wasting processes. Seismic reflection and refraction
Island subsidence, hot spots, and lithospheric thinning
Drilling results from several western Pacific atolls indicate the long-term subsidence of these islands is much more than would be expected from the cooling and thickening of the underlying
40Ar-39Ar geochronology of Santo Antão, Cape Verde Islands
Thermal and mechanical properties of the Cape Verde Rise
The Cape Verde Rise represents an extreme case of the process of oceanic midplate volcanism. The regional depth and geoid anomalies relative to the plate model are the largest observed, peaking at
The geological history of Maio, Cape Verde Islands
The oldest igneous rocks on Maio are pillow lavas of Mid-Ocean Ridge pillow basalts character which have been tilted and uplifted about 4 km from the ocean floor to outcrop as a partial ring, dipping